{"id":7875,"date":"2026-06-29T10:00:00","date_gmt":"2026-06-29T02:00:00","guid":{"rendered":"https:\/\/maxtormetal.com\/?p=7875"},"modified":"2026-06-29T14:53:36","modified_gmt":"2026-06-29T06:53:36","slug":"urschel-dicer-replacement-blades-440c-hrc-56-58-qa","status":"publish","type":"post","link":"https:\/\/maxtormetal.com\/ja\/urschel-dicer-replacement-blades-440c-hrc-56-58-qa\/","title":{"rendered":"HRC 56\u201358\u306b\u304a\u3051\u308b440C Urschel\u30c0\u30a4\u30b5\u30fc\u7528\u4ea4\u63db\u5203\u306e\u691c\u8a3c\uff1a\u71b1\u51e6\u7406\u6761\u4ef6\u3001RA\u7ba1\u7406\u3001\u304a\u3088\u3073\u54c1\u8cea\u4fdd\u8a3c\uff08QA\uff09\u30d7\u30ed\u30c8\u30b3\u30eb"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"898\" height=\"897\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main.jpg\" alt=\"HRC 56\u201358\u306b\u304a\u3051\u308b440C Urschel\u30c0\u30a4\u30b5\u30fc\u7528\u4ea4\u63db\u5203\u306e\u691c\u8a3c\uff1a\u71b1\u51e6\u7406\u6761\u4ef6\u3001RA\u7ba1\u7406\u3001\u304a\u3088\u3073\u54c1\u8cea\u4fdd\u8a3c\uff08QA\uff09\u30d7\u30ed\u30c8\u30b3\u30eb\" class=\"wp-image-7638\" style=\"aspect-ratio:16\/9;object-fit:cover\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main.jpg 898w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main-768x767.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main-600x599.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-main-100x100.jpg 100w\" sizes=\"(max-width: 898px) 100vw, 898px\" \/><\/figure><\/div><ul><li>What this guide covers: metallurgical window, QA\/validation, sanitation, and ROI<\/li>\n\n<li>Who should read: technical managers, manufacturing and process engineers<\/li>\n\n<li>Outcome: a data-backed path to specify and validate 440C at HRC 56\u201358<\/li><\/ul><p>Urschel-style dicer heads operate under demanding cyclic loading: blade bands contact product at high frequency, with impact severity varying significantly between soft fresh produce and hard frozen product (IQF frozen vegetables and root crops can present surface hardness comparable to hardened wood). Cut-size capability and blade life are directly coupled\u2014a band that chips on the first frozen cycle introduces dimensional scatter on every subsequent cut. That&#8217;s why material qualification for this application is not just a hardness specification: it&#8217;s a validated process window that holds up across the full product mix the line runs.<\/p><p>Urschel\u30b9\u30bf\u30a4\u30eb\u306e\u30d8\u30c3\u30c9\u7528\u4ea4\u63db\u30c0\u30a4\u30b5\u30fc\u30d0\u30f3\u30c9\uff08\u5207\u4e01\u6a5f\u7528\u30d0\u30f3\u30c9\u30bd\u30fc\uff09\u3092\u691c\u8a3c\u3059\u308b\u5834\u5408\u3001440C\u306f\u300c\u53b3\u683c\u306b\u7ba1\u7406\u3055\u308c\u3066\u521d\u3081\u3066\u771f\u4fa1\u3092\u767a\u63ee\u3059\u308b\u300d\u7d20\u6750\u3068\u8a00\u3048\u307e\u3059\u3002\u5203\u5148\u3092\u7dad\u6301\u3059\u308b\u5341\u5206\u306a\u786c\u5ea6\u3068\u3001\u6e7f\u6c17\u306e\u3042\u308b\u74b0\u5883\u306b\u8010\u3048\u308b\u8010\u98df\u6027\u3092\u517c\u306d\u5099\u3048\u3066\u3044\u308b\u53cd\u9762\u3001\u305a\u3055\u3093\u306a\u71b1\u51e6\u7406\u3084\u4ed5\u4e0a\u3052\u52a0\u5de5\u306f\u4e00\u5207\u8a31\u5bb9\u3055\u308c\u307e\u305b\u3093\u3002<\/p><p>From a quality-system perspective (the way&nbsp;<strong>Maxtor Metal<\/strong>&nbsp;documents critical consumables), the fastest path to repeatability is to treat \u201c440C at HRC 56\u201358\u201d as a&nbsp;<em>validated process window<\/em>\u2014not just a line item on a purchase order.<\/p><p><strong>Engineering Note:<\/strong>\u00a0If your validation plan also covers incoming strip form and ordering language, see Maxtor Metal&#8217;s <strong><a href=\"https:\/\/maxtormetal.com\/ja\/%e8%a3%bd%e5%93%81\/industrial-blade-strip-steel-beveled-reels\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em>industrial blade strip steel in beveled reels<\/em><\/a><\/strong> for form-factor specifications \u2014 including coil lengths, thickness tolerances, and surface finish grades \u2014 aligned with this QA protocol.<\/p><h2 class=\"wp-block-heading\" id=\"bfcf200c-93de-47f2-ae67-4eae8ef1e79d\">\u672c\u30ac\u30a4\u30c9\u306b\u3064\u3044\u3066\uff08\u304a\u3088\u3073\u305d\u306e\u4fe1\u983c\u6027\u306e\u6839\u62e0\uff09<\/h2><p>This guide is written from the perspective of a blade manufacturer operating under a quality-system mindset: defining a controllable process window, tying requirements to auditable records, and using field data to close the loop.<\/p><p>\u4f55&nbsp;<strong>Maxtor Metal<\/strong>&nbsp;can support in a qualification program (examples of documentation we can provide):<\/p><ul><li><strong>Incoming inspection records<\/strong>&nbsp;for strip\/band (dimensions, visual criteria, sampling plan, disposition) \u2014 shareable<\/li>\n\n<li><strong>Hardness gage control<\/strong>: calibration certificate and calibration interval statement \u2014 shareable<\/li>\n\n<li><strong>Heat-treatment batch records<\/strong>: time\/temperature charts, quench media notes, sub-zero cycle, temper parameters \u2014 shareable<\/li>\n\n<li>Heat\/lot traceability from incoming strip to finished dicer bands<\/li>\n\n<li>In-process and final inspection records<\/li>\n\n<li><strong>Material test reports (MTR) \/ chemistry records with heat\/lot identifiers<\/strong>&nbsp;\u2014 available under customer NDA<\/li>\n\n<li><strong>Hardness sampling map + results<\/strong>&nbsp;\u2014 available under customer NDA<\/li>\n\n<li>Metallography support for qualification lots and failure analysis;&nbsp;<strong>metallography photos\/reports (location, magnification, acceptance notes)<\/strong>&nbsp;\u2014 available under customer NDA<\/li>\n\n<li><strong>Grinding \/ surface integrity screening records<\/strong>&nbsp;(burn screening method + acceptance criteria) \u2014 available under customer NDA<\/li>\n\n<li><strong>Surface roughness (Ra) test records<\/strong>&nbsp;including cutoff, direction, sampling locations \u2014 available under customer NDA<\/li>\n\n<li><strong>Retained austenite (RA) by XRD is typically verified via an approved third-party laboratory<\/strong>&nbsp;when RA quantification is required<\/li><\/ul><p>If you want to align this guide with your plant\u2019s QA system, use it as a template and adjust acceptance bands to your equipment, product mix, and risk profile.<\/p><h2 class=\"wp-block-heading\" id=\"d41291ab-fdd1-4ac0-9909-10c6f0ee9380\">440C\u306e\u57fa\u672c\u7279\u6027<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"898\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11.jpg\" alt=\"440C fundamentals for Blade Strip Steel \" class=\"wp-image-7633\" style=\"aspect-ratio:1.5;object-fit:cover;width:734px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11.jpg 900w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11-768x766.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11-600x599.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-5.11-100x100.jpg 100w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"21af8d8d-cba6-4301-90e7-7150fd166cd7\">Composition and product forms<\/h3><p>440C is a high-carbon martensitic stainless steel designed to reach high hardness after hardening and tempering. The key point for dicer bands is that the alloy\u2019s performance comes from a martensitic matrix plus carbides\u2014so chemistry, carbide distribution, and heat treatment all show up as real differences in edge life and chipping behavior.<\/p><p>A practical way to write your incoming material requirement is:<\/p><ul><li>Specify the grade (440C \/ UNS S44004 or equivalent)<\/li>\n\n<li>Define allowed product forms (strip\/band suitable for forming and finishing into dicer bands)<\/li>\n\n<li>Bind the grade to documentation: heat\/lot traceability + chemical composition record<\/li><\/ul><p>For a canonical composition reference, ASM International\u2019s Alloy Digest entry for&nbsp;<a href=\"https:\/\/dl.asminternational.org\/alloy-digest\/article\/37\/6\/SS-101\/5194\/AISI-TYPE-440CHigh-Carbon-Chromium-Stainless-Steel\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>AISI Type 440C<\/em><\/strong><\/a>&nbsp;is a good starting point.<\/p><h3 class=\"wp-block-heading\" id=\"9565524f-33ef-4b97-8d42-9daaa2f45764\">Properties at HRC 56\u201358<\/h3><p>HRC 56\u201358 is a common \u201cmiddle band\u201d for dicer service because it targets a balance:<\/p><ul><li>High enough hardness for wear resistance and edge retention<\/li>\n\n<li>Enough toughness margin to reduce micro-chipping during transient impacts (product inclusions, ice, hard spots, misfeeds)<\/li><\/ul><p>The catch: the same Rockwell hardness can hide very different microstructures (carbide size\/distribution, retained austenite content, temper condition). That\u2019s why hardness is necessary\u2014but not sufficient\u2014as a release criterion.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/strong>: Treat HRC 56\u201358 as an&nbsp;<em>acceptance window<\/em>&nbsp;that must be paired with microstructure\/RA checks and surface integrity checks to be predictive in the field.<\/p><\/blockquote><h3 class=\"wp-block-heading\" id=\"1e1782c7-3c29-4876-b8d6-d9d6da5c816e\">Cleanliness options (ESR\/VIM)<\/h3><p>For Urschel-style dicer bands,&nbsp;<strong>conventional air-melt 440C<\/strong>&nbsp;is typically the default from a cost\/performance standpoint\u2014provided you control inclusions and variability via incoming QA and process validation.<\/p><p>When would you consider cleaner melting routes?<\/p><ul><li><strong>ESR (electroslag remelting)<\/strong>: when your failure mode is inclusion-driven edge chipping and you need tighter cleanliness.<\/li>\n\n<li><strong>VIM and\/or VIM+ESR<\/strong>: when you\u2019re chasing the highest consistency and can justify the extra cost (or the application is extremely sensitive to scatter).<\/li><\/ul><p>A practical approach is to qualify conventional melt first with a strict validation protocol, then \u201cupgrade\u201d only if your field data shows the limiting mechanism is cleanliness rather than heat treat, geometry, or surface damage.<\/p><h2 class=\"wp-block-heading\" id=\"28ae71ac-261e-4042-a5ab-42c0777c3977\">Cara Menentukan Jendela Heat-Treatment yang Valid untuk Pisau Sabuk Dicer 440C<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"900\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11.jpg\" alt=\"Cara Menentukan Jendela Heat-Treatment yang Valid untuk Pisau Sabuk Dicer 440C\" class=\"wp-image-7635\" style=\"width:680px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11.jpg 900w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-7.11-100x100.jpg 100w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"63ac8e48-2b6d-42dc-b53c-e406959094b4\">Austenitize and quench ranges<\/h3><p>Most processing windows for martensitic stainless place 440C austenitizing roughly in the&nbsp;<strong>~1850\u20131950\u00b0F<\/strong>&nbsp;range (section size and furnace capability matter), followed by a controlled quench. The bounds matter for opposite reasons: austenitizing below the lower end risks incomplete carbide dissolution and patchy hardness; pushing past the upper end dissolves too much carbon into the matrix, which drives retained austenite up and reduces the martensite fraction you&#8217;re trying to achieve.<\/p><p>Two rules that prevent most misprocessing:<\/p><ul><li>Don&#8217;t treat austenitize temperature as &#8220;higher is safer.&#8221; Excessive temperature\/soak can shift RA upward and alter carbide condition.<\/li>\n\n<li>Don&#8217;t treat quench as &#8220;anything fast.&#8221; Choose a quench that hits your transformation needs without cracking or distortion.<\/li><\/ul><p>For a baseline reference on stainless heat treatment ranges and considerations, ASM\u2019s&nbsp;<a href=\"https:\/\/dl.asminternational.org\/books\/chapter-pdf\/680730\/t59310233.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>Heat Treatment of Stainless Steels<\/em><\/strong><\/a>&nbsp;is a useful canonical source.<\/p><h3 class=\"wp-block-heading\" id=\"17902785-acc9-4e23-bec7-0250415e40cd\">Sub-zero and tempering for toughness<\/h3><p>The common reason dicer bands meet hardness but still chip is&nbsp;<em>microstructure mismatch<\/em>\u2014often too much RA, poorly stabilized martensite, or high residual stress.<\/p><p>A practical, shop-floor-friendly sequence used by many processors is:<\/p><ul><li>Austenitize (within your validated band)<\/li>\n\n<li>Quench<\/li>\n\n<li><strong>Sub-zero<\/strong>&nbsp;(cold treatment) to reduce RA and stabilize<\/li>\n\n<li><strong>Double temper<\/strong>&nbsp;to relieve stress and tune hardness\/toughness<\/li><\/ul><figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5.jpeg\" alt=\"Infographic: 440C heat-treatment flow \u2014 austenitize 1900\u20131950\u00b0F, quench, \u2212100 to \u2212120\u00b0F sub-zero, double temper 500\u2013550\u00b0F\" class=\"wp-image-7877\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5.jpeg 1536w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5-300x200.jpeg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5-1024x683.jpeg 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5-768x512.jpeg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5-18x12.jpeg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-5-600x400.jpeg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure><p>A defensible way to specify this is not \u201cuse this exact recipe,\u201d but:<\/p><ul><li>Require documented furnace controls and batch records<\/li>\n\n<li>Require the supplier to declare their validated ranges for each step<\/li>\n\n<li>Verify outcomes with hardness + RA + microstructure + field trial KPIs<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"6cd92551-0296-4183-a5b4-c671aaa55a53\">Microstructure targets and pitfalls<\/h3><p>For dicer bands, the microstructure targets are functional:<\/p><ul><li>Tempered martensite matrix with appropriate carbide distribution<\/li>\n\n<li>RA controlled to a band that matches your chipping-risk tolerance<\/li>\n\n<li>No evidence of surface thermal damage from grinding (burn) that creates brittle layers<\/li><\/ul><p>Common pitfalls that show up as premature chipping or erratic life:<\/p><ul><li><strong>High retained austenite<\/strong>: may pass hardness but reduces stability and can transform under load.<\/li>\n\n<li><strong>Over-austenitizing<\/strong>: can drive RA up and change carbide condition.<\/li>\n\n<li><strong>Under-tempering or inadequate temper cycles<\/strong>: leaves high residual stress.<\/li>\n\n<li><strong>Grinding burn \/ rehardening<\/strong>: creates a brittle skin and microcracks at the edge.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"dc951a9d-592d-41f8-8b2b-d087572fda74\">HRC 56\u201358\u304c\u5fc5\u8981\u6761\u4ef6\u3067\u3042\u3063\u3066\u5341\u5206\u6761\u4ef6\u3067\u306f\u306a\u3044\u7406\u7531\uff1a\u54c1\u8cea\u4fdd\u8a3c\uff08QA\uff09\u304a\u3088\u3073\u691c\u8a3c\u30d7\u30ed\u30c8\u30b3\u30eb<\/h2><h3 class=\"wp-block-heading\" id=\"da8b1a7d-f7d5-48fb-a7ca-f198d6c181eb\">Hardness and impact methods (ASTM E18\/E23)<\/h3><p>Hardness is the fastest screening metric, but only if the method is controlled.<\/p><ul><li>Use a standards-based Rockwell method such as&nbsp;<a href=\"https:\/\/www.astm.org\/standards\/e18.htm\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>ASTM E18<\/strong><\/em><\/a>&nbsp;and define:<ul><li>scale (typically HRC for hardened martensitic stainless)<\/li>\n\n<li>number of indents per part\/lot<\/li>\n\n<li>location plan (avoid edges, avoid thin unsupported zones)<\/li>\n\n<li>gage R&amp;R expectations<\/li><\/ul><\/li><\/ul><p>If chipping resistance is critical, add a toughness proxy with a consistent method such as&nbsp;<a href=\"https:\/\/www.astm.org\/standards\/e23.htm\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>ASTM E23<\/strong><\/em><\/a>&nbsp;(Charpy). For thin band\/blade geometries, you may need a subsize specimen plan, but the core benefit is comparing&nbsp;<em>lot-to-lot<\/em>&nbsp;\u305d\u3057\u3066&nbsp;<em>process-to-process<\/em>&nbsp;rather than chasing an absolute number.<\/p><h3 class=\"wp-block-heading\" id=\"8a000d79-3c2c-465e-b475-98cb148bab7d\">Microstructure and RA checks (third-party XRD + metallography)<\/h3><p>Two checks close the \u201chardness gap\u201d:<\/p><ul><li><strong>Retained austenite (RA) by XRD<\/strong>: set a release band appropriate to your risk profile and application. If you don\u2019t have in-house XRD, define an&nbsp;<em>approved third-party lab<\/em>&nbsp;and lock the method so results are comparable lot-to-lot.<\/li>\n\n<li><strong>Metallography<\/strong>: verify carbide distribution, martensite condition, and any abnormal structures; correlate with failure analysis.<\/li><\/ul><h4 class=\"wp-block-heading\" id=\"79e189ff-701f-40c4-879a-8f4fa4c56182\">Practical RA acceptance guidance (how to set a band)<\/h4><p>Because Rockwell hardness can be similar across very different microstructures, RA should be treated as a&nbsp;<em>predictive<\/em>&nbsp;release metric\u2014especially when the dominant failure mode is edge chipping.<\/p><p>For wet-service dicer band applications such as Urschel-style heads, Maxtor Metal&#8217;s engineering practice is to use \u22645% RA as a starting control target during qualification, then tighten or relax the band based on field chipping data. This is not a universal number\u2014geometry, product hardness, and sanitation chemistry all shift the optimum\u2014but it gives procurement documents a defensible, auditable starting point rather than an open-ended instruction.<\/p><p>A defensible way to specify RA in procurement documents is:<\/p><ul><li><strong>Qualification stage<\/strong>: define an RA target based on failure mode and stabilize it with field results.<ul><li>If your dominant risk is&nbsp;<strong>micro-chipping\/brittle edge failures<\/strong>, start with a&nbsp;<strong>lower RA<\/strong>&nbsp;target(\u22645% is a common field starting point for dicer band service).<\/li>\n\n<li>If your dominant risk is&nbsp;<strong>distortion\/cracking risk<\/strong>&nbsp;in heat treat, avoid overly aggressive RA reduction and use trials to confirm.<\/li><\/ul><\/li>\n\n<li><strong>Production surveillance stage<\/strong>: once the process is proven, keep RA as a periodic audit metric to control drift.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Note: the \u201cright\u201d RA number depends on geometry, processing route, and service conditions. If you already have baseline RA data from a known-good band, use that baseline to set your acceptance band rather than adopting a generic number.<\/p><\/blockquote><h4 class=\"wp-block-heading\" id=\"70ae69b4-ba7a-4aaf-ac08-c7e8db66085c\">What to document (so the data stays auditable)<\/h4><ul><li>specimen prep method and location<\/li>\n\n<li>etchant and imaging magnification (metallography)<\/li>\n\n<li>RA measurement method parameters (XRD setup) and reporting format<\/li>\n\n<li><strong>measurement uncertainty \/ repeatability statement<\/strong>&nbsp;from the lab (so you can set a realistic acceptance band)<\/li>\n\n<li>the acceptance band and the corrective action when out of band<\/li><\/ul><h4 class=\"wp-block-heading\" id=\"4d2c1271-39e9-4f08-9fc6-cedb07b8d7b6\">Out-of-band actions (examples)<\/h4><ul><li>RA higher than your band while hardness is in spec \u2192 review austenitize\/soak control, quench severity, sub-zero step effectiveness, and temper stabilization; re-check for grind burn before release<\/li>\n\n<li>RA lower than expected with increased cracking\/distortion risk \u2192 review quench and cold treatment severity; confirm geometry stability and residual stress condition<\/li><\/ul><h4 class=\"wp-block-heading\" id=\"5981d1a4-5ef8-4fe2-aacb-436127c8778c\">A simple way to set acceptance bands (no guesswork)<\/h4><p>If you don\u2019t want to debate \u201cgeneric\u201d RA numbers, set your acceptance bands from a known-good baseline lot, then tighten them as field data accumulates.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>\u30e1\u30c8\u30ea\u30c3\u30af<\/th><th>What to collect in the baseline lot<\/th><th>A practical acceptance-band rule<\/th><th>Why it works<\/th><\/tr><tr><td>\u786c\u5ea6\uff08HRC\uff09<\/td><td>n measurements per lot using a fixed location plan<\/td><td>Use your spec window (e.g., 56\u201358) and add a drift check (e.g., median stays inside the window across lots)<\/td><td>Prevents \u201cmeets spec but drifting\u201d situations<\/td><\/tr><tr><td>RA by XRD<\/td><td>n measurements, same specimen location, same lab\/method<\/td><td>Start with a percentile band (e.g., keep future lots within the baseline 10\u201390% range), then tighten if chipping risk is high<\/td><td>Robust when you don\u2019t trust normality assumptions<\/td><\/tr><tr><td>Edge life<\/td><td>n trials per lot (hours or tons) under the same product mix<\/td><td>Track the median and 10\u201390% range per lot; require non-regression vs baseline before approving changes<\/td><td>Separates true improvement from outliers<\/td><\/tr><tr><td>Chipping rate<\/td><td>chips per inspection interval with the same inspection method<\/td><td>Use a simple rule: if the median worsens vs baseline for two consecutive lots, trigger a root-cause review<\/td><td>Creates an early-warning system<\/td><\/tr><\/tbody><\/table><\/figure><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Tip: when using third-party XRD, require the lab to report repeatability\/uncertainty so you don\u2019t set a band tighter than the method can reliably resolve.<\/p><\/blockquote><h3 class=\"wp-block-heading\" id=\"4dab334f-68c2-46e8-a86e-669a20e1a120\">Geometry, burn, and surface finish (Ra \u2264 32 \u00b5in)<\/h3><p>For replacement dicer bands, geometry and surface integrity often dominate \u201cmysterious\u201d field failures. Include explicit checks for:<\/p><ul><li>flatness \/ straightness (fit-up stability)<\/li>\n\n<li>edge geometry (bevel angle, land, edge radius if specified)<\/li>\n\n<li>burr control<\/li>\n\n<li>grinding burn and microcracking (nital etch, Barkhausen where appropriate, or microscopy)<\/li><\/ul><p>For product-contact surfaces, a common hygienic baseline is&nbsp;<strong>Ra \u2264 0.8 \u00b5m (32 \u00b5in)<\/strong>. 3-A sanitary design guidance frequently references this threshold; see the 3-A SSI deck&nbsp;<a href=\"https:\/\/my.3-a.org\/Portals\/93\/Documents\/Annual%20Meetings%20Presentations\/May%2016_Basics%20of%20Sanitary%20Design.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>Basics of Sanitary Design<\/strong><\/em><\/a>. EHEDG design guidelines consistently specify product-contact surfaces smoother than Ra = 0.8 \u00b5m; see&nbsp;<a href=\"https:\/\/www.ehedg.org\/guidelines\/doc-8\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>EHEDG Guideline Document 8<\/strong><\/em><\/a>&nbsp;for the relevant hygienic equipment design criteria.<\/p><p><strong>Make Ra requirements comparable<\/strong>&nbsp;by specifying measurement details (otherwise different suppliers may report different numbers for the same surface):<\/p><ul><li>measurement direction (parallel\/perpendicular to grind lines)<\/li>\n\n<li>evaluation length and&nbsp;<strong>cutoff \/ filter setting<\/strong>&nbsp;used by the profilometer<\/li>\n\n<li>number of traces per part and the sampling locations<\/li><\/ul><p>A practical acceptance package ties finish to function:<\/p><ul><li>Ra (specify the measurement cutoff and direction)<\/li>\n\n<li>visual finish criteria (no pits, laps, embedded debris)<\/li>\n\n<li>passivation status (see next section)<\/li><\/ul><p><strong>Maxtor Metal quality controls and traceability records (technical integration):<\/strong>&nbsp;A QC-oriented supplier should be able to provide a traceable record set for each lot, such as:<\/p><ul><li>heat\/lot number linkage from strip to finished band<\/li>\n\n<li>material test report (chemistry) and incoming verification<\/li>\n\n<li>heat-treat batch record (time\/temperature charts, quench media, sub-zero cycle, temper cycles)<\/li>\n\n<li>hardness sampling map and results<\/li>\n\n<li>microstructure photo set and RA report (XRD) for qualification lots (and periodic surveillance thereafter)<\/li>\n\n<li>surface finish (Ra) records and burn screening criteria<\/li>\n\n<li>nonconformance disposition and corrective-action link when a lot is out of band<\/li><\/ul><p>This isn\u2019t marketing fluff\u2014it\u2019s what lets a plant engineer correlate a chipping spike to a specific heat treat batch, grind wheel condition, or strip heat.<\/p><h2 class=\"wp-block-heading\" id=\"1b42132f-fe76-423e-82be-69e9e0361415\">\u536b\u751f\u7ba1\u7406\u3068\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\uff08\u898f\u683c\u9069\u5408\uff09<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"902\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21.jpg\" alt=\"\u536b\u751f\u7ba1\u7406\u3068\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\uff08\u898f\u683c\u9069\u5408\uff09\" class=\"wp-image-7640\" style=\"width:781px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21.jpg 900w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21-768x770.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21-600x601.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/Blade-Strip-Steel-21-100x100.jpg 100w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"9cf1c7bf-7a83-44ab-a558-9b5a1362f378\">Cleaning and passivation (ASTM A380\/A967)<\/h3><p>In wet food-processing service, \u201cstainless\u201d isn\u2019t a binary state. Surface condition (free iron, embedded grit, smeared metal from machining) can change corrosion behavior and cleanability.<\/p><p>Two widely cited references to anchor your cleaning\/passivation language are:<\/p><ul><li><a href=\"https:\/\/www.astm.org\/standards\/a380.htm\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ASTM A380<\/em><\/strong><\/a>&nbsp;for cleaning\/descaling\/passivation practices<\/li>\n\n<li><a href=\"https:\/\/www.astm.org\/standards\/a967.htm\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>ASTM A967<\/strong><\/em><\/a>&nbsp;for passivation treatment options and related requirements<\/li><\/ul><p>Write your spec so sanitation steps are verifiable:<\/p><ul><li>define the cleaning\/passivation method class to be used<\/li>\n\n<li>require documentation of the process and any verification tests you rely on<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"b49ef003-0e2a-4ede-8b18-6e6d24fe85d4\">Chemical compatibility in washdowns<\/h3><p>Dicer environments often see aggressive washdowns, temperature swings, and chloride exposure. Even with 440C, corrosion risk increases when:<\/p><ul><li>chloride concentration is high<\/li>\n\n<li>there are crevices or rough surfaces<\/li>\n\n<li>passivation is inconsistent<\/li>\n\n<li>residues remain trapped under bands or hardware<\/li><\/ul><p>This is where surface finish, passivation discipline, and assembly hygiene matter as much as the alloy selection.<\/p><h3 class=\"wp-block-heading\" id=\"39ad3e39-51b5-471f-9aa3-71726e214554\">Documentation and traceability for audits<\/h3><p>If you\u2019re in a regulated or audit-heavy environment, treat blades\/bands as controlled components:<\/p><ul><li>link each lot to a traceability packet<\/li>\n\n<li>store heat-treat records and inspection data by lot<\/li>\n\n<li>define retention time and retrieval process<\/li><\/ul><p>The payoff is simple: when a plant sees a sanitation deviation or foreign material risk, you can isolate by lot and respond with evidence.<\/p><h2 class=\"wp-block-heading\" id=\"244df3fe-c6fb-4434-957b-f562309afcde\">\u30d5\u30a3\u30fc\u30eb\u30c9\u30c6\u30b9\u30c8\u3068ROI\uff08\u6295\u8cc7\u5bfe\u52b9\u679c\uff09<\/h2><h3 class=\"wp-block-heading\" id=\"b4ba27f5-b98e-4e87-9635-32a4f95d0273\">Why ROI framing matters for blade qualification<\/h3><p>For procurement and production managers, the question behind any blade qualification is simple: does the cost and effort of running a validated program pay off? The answer is almost always yes\u2014but only if you measure the right things.<\/p><p>A practical way to frame the ROI case before a trial:<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Cost driver<\/th><th>Typical measurement unit<\/th><th>Where validated 440C at HRC 56\u201358 reduces cost<\/th><\/tr><tr><td>Blade changeover downtime<\/td><td>Minutes\/week \u00d7 labor + line rate<\/td><td>Longer, more consistent edge life reduces unplanned stops<\/td><\/tr><tr><td>Blade consumption rate<\/td><td>Bands per ton processed<\/td><td>Reduced chipping scatter extends usable life per set<\/td><\/tr><tr><td>Cut-size rework\/waste<\/td><td>% yield loss on critical cut dimension<\/td><td>Tighter Cpk on HRC and RA \u2192 more consistent cut geometry<\/td><\/tr><tr><td>Supplier qualification overhead<\/td><td>Engineer-hours per lot<\/td><td>Standardized documentation package reduces re-qualification burden<\/td><\/tr><\/tbody><\/table><\/figure><p><strong>Example framing (hypothetical):<\/strong>&nbsp;A mid-size frozen vegetable processor running two Urschel lines might see blade changeover account for 20\u201340 minutes of downtime per week per line under an unvalidated supply program. If a validated process window improves edge-life consistency, it can be reasonable to expect a meaningful reduction in that downtime\u2014<em>but the exact number depends on product mix, sanitation cycle frequency, and baseline blade life<\/em>. That\u2019s why predefining trial KPIs (see below) is the only reliable way to measure your specific ROI.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Key Takeaway:<\/strong>&nbsp;Blade validation is not a cost\u2014it is the mechanism by which you convert a commodity purchase into a controlled consumable with predictable cost-per-ton.<\/p><\/blockquote><h2 class=\"wp-block-heading\" id=\"2d45d1f1-b881-4327-8c04-75bedd2a92c6\">\u7c21\u6613\u691c\u8a3c\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\uff08QA\u8a08\u753b\u3078\u306e\u30b3\u30d4\u30fc\uff06\u30da\u30fc\u30b9\u30c8\u7528\uff09<\/h2><p>Use this as a \u201cminimum viable\u201d qualification pack for replacement dicer bands. It is designed so a plant can audit the lot, reproduce the processing window, and run CAPA when results drift.<\/p><h3 class=\"wp-block-heading\" id=\"a3eb67d6-2b9e-48c7-8e10-674751f6490b\">Stage 1 \u2014 Qualification lots (prove the process window)<\/h3><p>Use this stage when you are onboarding a supplier, changing strip source, changing heat-treatment routing, or adjusting finishing.<\/p><p><strong>A) Incoming material (strip\/band)<\/strong><\/p><ul><li>Supplier, PO, part number \/ drawing revision<\/li>\n\n<li>Grade designation (440C \/ UNS S44004 or equivalent)<\/li>\n\n<li>Heat\/lot number and traceability linkage<\/li>\n\n<li>MTR \/ chemistry record (under customer NDA if required)<\/li>\n\n<li>Incoming inspection record: dimensions, visual criteria, sampling plan, disposition<\/li><\/ul><p><strong>B) Process records (heat treat + finishing)<\/strong><\/p><ul><li>Heat-treat batch ID + time\/temperature chart<\/li>\n\n<li>Quench media notes + control checks<\/li>\n\n<li>Sub-zero step (temperature, time, sequence)<\/li>\n\n<li>Temper cycles (count, temperature range, time)<\/li>\n\n<li>Grinding \/ finishing record (wheel spec, dressing interval, coolant condition, operator\/shift)<\/li><\/ul><p>Maxtor Metal maintains batch-level records for each of these steps as standard practice; qualification customers can request the full documentation package under a mutual NDA.<\/p><p><strong>C) Release tests (qualification lot)<\/strong><\/p><ul><li>Hardness (ASTM E18): sampling map, number of indents, results, gage status<\/li>\n\n<li>Surface integrity: burn screening method + acceptance criteria<\/li>\n\n<li>Surface finish (Ra): instrument settings (cutoff), direction, sampling locations, results<\/li>\n\n<li>Metallography: photo set ID, location, magnification, acceptance notes (under customer NDA if required)<\/li>\n\n<li>RA by XRD (third-party, if required): lab, method reference, location, result, uncertainty\/repeatability statement<\/li><\/ul><p><strong>D) Field trial log (qualification lots)<\/strong><\/p><ul><li>Installation: date\/time, line, product type, sanitation cycle notes<\/li>\n\n<li>KPI log: edge life, chipping rate, downtime, cut-size Cpk<\/li>\n\n<li>Removal reason: planned vs failure, with photo evidence when possible<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"a933f490-2025-4d47-a752-06dc6cdfe2dd\">Stage 2 \u2014 Production lots (control drift)<\/h3><p>After the process window is proven, keep a lean release plan on every lot and move deeper tests to periodic surveillance.<\/p><p><strong>A) Lot release (every lot)<\/strong><\/p><ul><li>Traceability linkage (heat\/lot \u2192 finished band)<\/li>\n\n<li>Hardness check with the same location plan<\/li>\n\n<li>Surface integrity screening (burn) and Ra verification per your agreed sampling plan<\/li>\n\n<li>Confirm heat-treatment batch record is complete and within declared ranges<\/li><\/ul><p><strong>B) Periodic surveillance (e.g., on a scheduled cadence or when drift is suspected)<\/strong><\/p><ul><li>Metallography photo set review<\/li>\n\n<li>RA by third-party XRD (when RA is a controlling risk)<\/li>\n\n<li>Expanded dimensional\/geometry audits<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"274f8323-5b0f-4956-b413-eee5df02434b\">Out-of-spec &amp; CAPA triggers (simple, audit-friendly rules)<\/h3><ul><li>Any release metric out of band \u2192 quarantine the lot and run a documented disposition (use-as-is \/ rework \/ scrap)<\/li>\n\n<li>If a KPI regresses vs baseline for consecutive lots or shows a consistent drift trend \u2192 trigger a root-cause review<\/li>\n\n<li>Prioritize checks in this order when failures are ambiguous:&nbsp;<strong>burn\/surface integrity \u2192 RA\/microstructure \u2192 heat-treat records \u2192 strip heat\/MTR<\/strong><\/li><\/ul><h3 class=\"wp-block-heading\" id=\"aa7a2669-dfaa-425f-93d4-b6940b3b8eb4\">Trial design and KPIs in frozen and root crops<\/h3><p>A good trial doesn\u2019t just ask \u201cdid it last longer?\u201d It asks whether the new bands improve&nbsp;<em>repeatable output<\/em>&nbsp;without raising risk.<\/p><p>Trial design principles:<\/p><ul><li>Compare against a baseline band under the same product mix and sanitation cycle.<\/li>\n\n<li>Control one variable at a time (material\/HT\/finish), or you won\u2019t know what caused the outcome.<\/li>\n\n<li>Predefine the run duration or throughput target.<\/li><\/ul><p>KPIs that travel well across frozen and root crops:<\/p><ul><li>edge life (hours or tons processed)<\/li>\n\n<li>downtime (minutes\/week attributable to band changeover or rework)<\/li>\n\n<li>chipping rate (chips per inspection interval, or % bands failing before target)<\/li>\n\n<li>cut-size capability (Cpk on the critical cut-size dimension)<\/li><\/ul><figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4.jpeg\" alt=\"KPI dashboard: before\/after edge life, downtime, chipping rate, and cut-size Cpk from plant trials\" class=\"wp-image-7876\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4.jpeg 1536w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4-300x200.jpeg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4-1024x683.jpeg 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4-768x512.jpeg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4-18x12.jpeg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/06\/image-4-600x400.jpeg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure><h3 class=\"wp-block-heading\" id=\"b0b50f19-6f99-4c18-b0d6-7965f92590a9\">How to present trial results (so decisions are data-backed)<\/h3><p>To reduce debate and make trials comparable across lots, define a simple statistical view upfront:<\/p><ul><li><strong>Lot-to-lot scatter<\/strong>: use box plots for edge life (hours\/tons) and chipping counts per inspection interval<\/li>\n\n<li><strong>Stability over time<\/strong>: use a basic control chart for chipping rate or downtime minutes\/week<\/li>\n\n<li><strong>Capability<\/strong>: report cut-size&nbsp;<strong>Cpk<\/strong>&nbsp;on the critical dimension with the same sampling method each run<\/li><\/ul><p>If you only do one thing: report&nbsp;<strong>sample size (n)<\/strong>, the&nbsp;<strong>median<\/strong>, and the&nbsp;<strong>10\u201390% range<\/strong>&nbsp;for edge life per lot. That usually reveals whether you have a true process-window improvement or just a \u201cbest-case\u201d outlier.<\/p><p>Make the trial \u201caudit-ready\u201d by defining acceptance bands upfront:<\/p><ul><li>HRC 56\u201358 is the hardness band\u2014define the sampling plan.<\/li>\n\n<li>Define a chipping threshold (what counts as a fail).<\/li>\n\n<li>Define Cpk targets (or the minimum improvement delta) for cut-size.<\/li>\n\n<li>Define sanitation outcomes (no abnormal corrosion\/pitting after a defined washdown cycle count).<\/li><\/ul><p>A practical logging checklist:<\/p><ul><li>lot ID + heat-treat batch ID<\/li>\n\n<li>installation date\/time, line, product type<\/li>\n\n<li>sanitation cycles and chemistry notes<\/li>\n\n<li>inspection intervals and findings (chips, burn, corrosion marks)<\/li>\n\n<li>reason for removal (planned vs failure)<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"2acad6ec-8137-449f-bdcb-8c6fa628f409\">Root-cause feedback to process window<\/h3><p>When a trial misses targets, force a closed-loop diagnosis rather than \u201ctry a different supplier\u201d guessing:<\/p><ul><li>If hardness is in band but chipping is high \u2192 prioritize RA\/microstructure check + grind burn screening.<\/li>\n\n<li>If edge life is low with clean edges \u2192 revisit carbide condition (austenitize\/temper window) and surface finish.<\/li>\n\n<li>If corrosion appears early \u2192 revisit passivation and surface finish, then confirm washdown compatibility.<\/li><\/ul><p>Done well, your field trial becomes a control loop: it tightens the heat-treatment and finishing window until the outcome is predictable.<\/p><h2 class=\"wp-block-heading\" id=\"e31410d3-3537-4ffc-90d7-b54a54e91f73\">\u4ee3\u66ff\u6750\u3068\u9009\u5b9a\u57fa\u6e96<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"378\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/DSC0105311.jpg\" alt=\"\u4ee3\u66ff\u6750\u3068\u9009\u5b9a\u57fa\u6e96\" class=\"wp-image-7650\" style=\"width:851px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/DSC0105311.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/DSC0105311-300x113.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/DSC0105311-768x290.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/DSC0105311-18x7.jpg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/DSC0105311-600x227.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"fe128227-7e17-4e8e-8ef4-eb543bf9549e\">420 vs 440C trade-offs<\/h3><p>420-class martensitic stainless generally offers:<\/p><ul><li>better toughness margin at a given corrosion resistance level<\/li>\n\n<li>lower achievable wear resistance than 440C at comparable processing<\/li><\/ul><p>If your dominant failure mode is brittle chipping (and not wear), 420 variants can be worth evaluating\u2014<em>but you\u2019ll usually pay for it in edge life<\/em>&nbsp;unless geometry and process changes compensate.<\/p><h3 class=\"wp-block-heading\" id=\"4ad43db8-d096-4846-8b45-8f09d4938dd2\">D2\/M2 risks in wet service<\/h3><p>High-wear tool steels like D2 and high-speed steels like M2 can deliver excellent wear resistance, but wet service introduces risks:<\/p><ul><li>corrosion and staining<\/li>\n\n<li>sanitation chemical sensitivity<\/li>\n\n<li>crevice corrosion at interfaces<\/li><\/ul><p>If you go this route, you\u2019re often forced into coatings, tighter cleaning constraints, or more aggressive surface protection\u2014each with its own validation burden.<\/p><h3 class=\"wp-block-heading\" id=\"2ef39e26-53a4-4caa-941c-1b74f22a789e\">PM stainless options and when to upgrade<\/h3><p>Powder-metallurgy (PM) stainless options can improve cleanliness and consistency, and may reduce inclusion-driven chipping scatter. Upgrade triggers typically look like:<\/p><ul><li>you\u2019ve validated geometry, finishing, and conventional 440C heat treat<\/li>\n\n<li>failure analysis still points to cleanliness\/inclusion sensitivity<\/li>\n\n<li>ROI still works after the material premium<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"9007d57a-84b9-4746-a062-18ea40da3bce\">\u9069\u7528\u7bc4\u56f2\u3068\u9650\u754c<\/h2><p>This guide is intended for qualification and supplier validation of&nbsp;<strong>440C dicer replacement bands<\/strong>&nbsp;operating in wet, sanitation-driven environments.<\/p><ul><li>Use it when your goal is repeatability: stable hardness, controlled microstructure\/RA (when required), and verified surface integrity.<\/li>\n\n<li>Treat all numeric targets as&nbsp;<strong>site-specific<\/strong>: geometry, product mix, sanitation chemistry, and equipment condition can shift the \u201cbest\u201d window.<\/li>\n\n<li>For unusually severe impact loading, highly abrasive inclusions, or extreme corrosion exposure, treat this guide as a baseline and add additional validation (materials upgrade, coating trials, or application-specific testing).<\/li><\/ul><p>Final acceptance should be based on documented lot records and your plant trial results (and third-party verification where required).<\/p><h2 class=\"wp-block-heading\" id=\"a9778598-1b6f-4db3-87da-9bec44f8e3eb\">\u7d50\u8ad6<\/h2><ul><li>440C remains a cost-effective choice when validated to spec<\/li>\n\n<li>Use the defined QA and trial protocol to ensure repeatability<\/li><\/ul><p><strong>The one-sentence version:<\/strong>&nbsp;For Urschel-style dicer band applications in wet food-processing environments, 440C validated to HRC 56\u201358 with controlled RA (\u22645% starting target), documented heat-treat batch records, and surface integrity screening is the most cost-effective path to repeatable edge life\u2014provided the validation protocol treats hardness as a necessary but not sufficient release criterion.<\/p><p>If you want a spec that holds up across suppliers, the key is to bind &#8220;440C at HRC 56\u201358&#8221; to documented process controls: heat\/lot traceability, heat-treat batch records, hardness + RA verification, and surface integrity checks. That&#8217;s the same discipline Maxtor Metal applies internally to keep performance repeatable across lots. Maxtor Metal qualification packages\u2014including MTRs, heat-treat batch records, hardness sampling maps, and third-party XRD reports\u2014are available to customers running formal supplier validation programs.<\/p><p>For reference language around strip supply forms and how to describe them in procurement documents, you can note earlier\u2014then keep your acceptance criteria in the validation protocol above.<\/p><h2 class=\"wp-block-heading\" id=\"fe56aa84-9d41-44b9-a090-8c09e6becc95\">FAQs\uff1a<\/h2><h3 class=\"wp-block-heading\" id=\"f8de5d7d-328a-465c-ae3e-885196db74cd\">440C\u30c0\u30a4\u30b5\u30fc\u7528\u4ea4\u63db\u5203\u306e\u9069\u6b63\u306a\u786c\u5ea6\u306f\u3069\u306e\u304f\u3089\u3044\u3067\u3059\u304b\uff1f<\/h3><p>HRC 56\u201358\u304c\u4e00\u822c\u7684\u306a\u53d7\u5165\u57fa\u6e96\uff08\u30d7\u30ed\u30bb\u30b9\u30a6\u30a3\u30f3\u30c9\u30a6\uff09\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u5203\u5148\u306e\u8010\u6469\u8017\u6027\u3068\u4e00\u5b9a\u306e\u976d\u6027\uff08\u7c98\u308a\u5f37\u3055\uff09\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u53d6\u308c\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u786c\u5ea6\u3060\u3051\u3067\u51fa\u8377\u5224\u5b9a\u3092\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u5fc5\u305a\u7d44\u7e54\u691c\u67fb\uff0f\u6b8b\u7559\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\u306e\u78ba\u8a8d\u3001\u304a\u3088\u3073\u8868\u9762\u6027\u72b6\uff08\u7814\u524a\u713c\u3051\uff09\u306e\u30c1\u30a7\u30c3\u30af\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u8a55\u4fa1\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><h3 class=\"wp-block-heading\" id=\"efbc201e-ef68-429e-b043-6f976acfb928\">HRC 56\u201358\u306b\u9054\u3059\u308b\u305f\u3081\u306e440C\u306e\u63a8\u5968\u71b1\u51e6\u7406\u6761\u4ef6\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3><p>\u5178\u578b\u7684\u306a\u7ba1\u7406\u30d7\u30ed\u30bb\u30b9\u3068\u3057\u3066\u306f\u30011850\u20131950\u00b0F\uff081010\u20131065\u00b0C\uff09\u306e\u7bc4\u56f2\u3067\u306e\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\u5316\u3001\u30af\u30a8\u30f3\u30c1\uff08\u713c\u5165\u308c\uff09\u3001\u6b8b\u7559\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\u3092\u4f4e\u6e1b\u3059\u308b\u305f\u3081\u306e\u30b5\u30d6\u30bc\u30ed\u51e6\u7406\uff08\u6df1\u51b7\u51e6\u7406\uff09\u3001\u305d\u3057\u3066\u30c0\u30d6\u30eb\u30c6\u30f3\u30d1\u30fc\uff08\u4e8c\u56de\u713c\u623b\u3057\uff09\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002\u540d\u76ee\u4e0a\u306e\u30ec\u30b7\u30d4\u306b\u983c\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u8a18\u9332\u3055\u308c\u305f\u7089\u306e\u7ba1\u7406\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3001\u786c\u5ea6\u3068\u6b8b\u7559\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\uff08RA\uff09\u30c7\u30fc\u30bf\u3067\u7d50\u679c\u3092\u691c\u8a3c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><h3 class=\"wp-block-heading\" id=\"bc7ce895-dbfa-4910-88ac-f2923de76c19\">\u786c\u5316\u51e6\u7406\u3055\u308c\u305f440C\u5203\u7269\u306e\u786c\u5ea6\u3092\u6b63\u3057\u304f\u6e2c\u5b9a\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/h3><p>ASTM E18\u306a\u3069\u306e\u6a19\u6e96\u898f\u683c\u306b\u57fa\u3065\u304f\u30ed\u30c3\u30af\u30a6\u30a7\u30eb\u786c\u3055\u8a66\u9a13\u6cd5\u3092\u4f7f\u7528\u3057\u3001\u6e2c\u5b9a\u4f4d\u7f6e\u8a08\u753b\u3092\u5b9a\u7fa9\u3057\u3001\u30ed\u30c3\u30c8\u3054\u3068\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u983b\u5ea6\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u8aa4\u3063\u305f\u6e2c\u5b9a\u5024\u3092\u9632\u3050\u305f\u3081\u3001\u6e2c\u5b9a\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u304c\u8584\u8089\u90e8\u306b\u9069\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><h3 class=\"wp-block-heading\" id=\"cf896782-a2b7-4cd7-9259-0b2d33750510\">440C\u306e\u6b8b\u7559\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\u306f\u3069\u306e\u3088\u3046\u306b\u6e2c\u5b9a\u3057\u307e\u3059\u304b\uff1f<\/h3><p>X\u7dda\u56de\u6298\uff08XRD\uff09\u304c\u4e00\u822c\u7684\u306a\u5b9a\u91cf\u6e2c\u5b9a\u6cd5\u3067\u3059\u3002\u3053\u308c\u306b\u91d1\u5c5e\u7d44\u7e54\u8a66\u9a13\uff08\u91d1\u76f8\u89b3\u5bdf\uff09\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5faeSnapshot\u7d44\u7e54\u306e\u72b6\u614b\u3092\u6b63\u78ba\u306b\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002\u91cd\u8981\u306a\u306e\u306f\u3001\u53d7\u5165\u5224\u5b9a\u5e45\uff08\u8a31\u5bb9\u7bc4\u56f2\uff09\u3092\u8a2d\u5b9a\u3057\u3001\u6e2c\u5b9a\u6761\u4ef6\uff08\u30d1\u30e9\u30e1\u30fc\u30bf\uff09\u3092\u8a18\u9332\u3057\u3066\u3001\u30ed\u30c3\u30c8\u9593\u3067\u7d50\u679c\u3092\u6bd4\u8f03\u53ef\u80fd\u306b\u3059\u308b\u3053\u3068\u3067\u3059\u3002Urschel\u30b9\u30bf\u30a4\u30eb\u306e\u30c0\u30a4\u30b5\u30fc\u30d0\u30f3\u30c9\u7528\u9014\u3067\u306f\u3001\u521d\u671f\u7ba1\u7406\u76ee\u6a19\u5024\u3068\u3057\u3066\u300c\u6b8b\u7559\u30aa\u30fc\u30b9\u30c6\u30ca\u30a4\u30c8\uff08RA\uff095%\u4ee5\u4e0b\u300d\u304c\u696d\u754c\u306e\u4e00\u822c\u7684\u306a\u30d9\u30f3\uce58\u30de\u30fc\u30af\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\" id=\"68497cfc-d044-4f90-bd96-c3398152ee1b\">\u98df\u54c1\u306b\u63a5\u89e6\u3059\u308b\u30b9\u30c6\u30f3\u30ec\u30b9\u88fd\u5203\u7269\u306b\u304a\u3044\u3066\u3001\u8a31\u5bb9\u3055\u308c\u308b\u8868\u9762\u7c97\u3055\u306f\u3069\u306e\u304f\u3089\u3044\u3067\u3059\u304b\uff1f<\/h3><p>\u88fd\u54c1\u63a5\u89e6\u9762\u306b\u304a\u3051\u308b\u4e00\u822c\u7684\u306a\u885b\u751f\u57fa\u6e96\uff08\u30cf\u30a4\u30b8\u30a7\u30cb\u30c3\u30af\u30fb\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\uff09\u306f Ra \u2264 0.8 \u00b5m\uff0832 \u00b5in\uff09\u3067\u3059\u3002\u3053\u308c\u306f3-A\u885b\u751f\u30c7\u30b6\u30a4\u30f3\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306b\u898f\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001EHEDG\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3082\u53cd\u6620\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30b5\u30d7\u30e9\u30a4\u30e4\u30fc\u304c\u540c\u4e00\u306e\u57fa\u6e96\u3067\u5831\u544a\u3067\u304d\u308b\u3088\u3046\u3001\u6e2c\u5b9a\u65b9\u6cd5\u304a\u3088\u3073\u6e2c\u5b9a\u65b9\u5411\uff08\u7814\u78e8\u76ee\u306b\u5bfe\u3059\u308b\u65b9\u5411\uff09\u3092\u660e\u78ba\u306b\u5b9a\u7fa9\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><h3 class=\"wp-block-heading\" id=\"9525da11-2047-4a03-b99c-d27f046ee38f\">\u30b9\u30c6\u30f3\u30ec\u30b9\u88fd\u30c0\u30a4\u30b5\u30fc\u30d0\u30f3\u30c9\uff08\u5207\u4e01\u6a5f\u7528\u30d0\u30f3\u30c9\u30bd\u30fc\uff09\u306e\u4e0d\u52d5\u614b\u5316\u51e6\u7406\u306b\u306f\u3001\u3069\u306e\u898f\u683c\u3092\u62e0\u308a\u6240\u306b\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3><p>\u6d17\u6d44\u304a\u3088\u3073\u4e0d\u52d5\u614b\u5316\u51e6\u7406\u306e\u65bd\u5de5\u5b9f\u52d9\u306b\u306fASTM A380\u3092\u3001\u5316\u5b66\u7684\u4e0d\u52d5\u614b\u5316\u51e6\u7406\u306e\u9078\u629e\u80a2\u304a\u3088\u3073\u8981\u6c42\u4e8b\u9805\u306b\u306fASTM A967\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u306e\u4e0a\u3067\u3001\u63d0\u51fa\u66f8\u985e\uff08\u54c1\u8cea\u8a3c\u660e\u66f8\uff09\u304a\u3088\u3073\u691c\u8a3c\u306b\u95a2\u3059\u308b\u53d7\u5165\u57fa\u6e96\u3092\u660e\u8a18\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><h3 class=\"wp-block-heading\" 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class=\"wp-block-heading\" id=\"bb41bebb-d6ac-4e01-8644-5a8f46b5bb28\">\u4ee3\u66ff\u7528\u30c0\u30a4\u30b5\u30fc\u30d0\u30f3\u30c9\uff08\u5207\u4e01\u6a5f\u7528\u30d0\u30f3\u30c9\u30bd\u30fc\uff09\u3092\u8a8d\u5b9a\u3059\u308b\u305f\u3081\u306e\u5de5\u5834\u5b9f\u6a5f\u8a66\u9a13\uff08\u30d7\u30e9\u30f3\u30c8\u30c8\u30e9\u30a4\u30a2\u30eb\uff09\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u8a2d\u8a08\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3><p>\u7ba1\u7406\u3055\u308c\u305f\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\u6bd4\u8f03\u624b\u6cd5\u3092\u7528\u3044\u3001KPI\uff08\u5203\u5148\u5bff\u547d\u3001\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3001\u30c1\u30c3\u30d4\u30f3\u30b0\u7387\u3001\u30ab\u30c3\u30c8\u30b5\u30a4\u30baCpk\uff09\u3092\u4e8b\u524d\u5b9a\u7fa9\u3057\u3001\u958b\u59cb\u524d\u306b\u53d7\u5165\u8a31\u5bb9\u5e45\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30ed\u30c3\u30c8ID\u3001\u6d17\u6d44\u6bba\u83cc\u30b5\u30a4\u30af\u30eb\u3001\u691c\u67fb\u7d50\u679c\u3092\u8a18\u9332\u3057\u3001\u4e0d\u5177\u5408\u767a\u751f\u6642\u306b\u30d7\u30ed\u30bb\u30b9\u30a6\u30a3\u30f3\u30c9\u30a6\uff08\u88fd\u9020\u6761\u4ef6\u306e\u7bc4\u56f2\uff09\u306e\u6839\u672c\u539f\u56e0\u307e\u3067\u8ffd\u8de1\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002Maxtor Metal\u3067\u306f\u3001\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u3001\u8a66\u9a13\u7528\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u304a\u3088\u3073\u30ed\u30c3\u30c8\u5358\u4f4d\u306e\u30c8\u30ec\u30fc\u30b5\u30d3\u30ea\u30c6\u30a3\u8a18\u9332\u3092\u63d0\u4f9b\u53ef\u80fd\u3067\u3059\u3002<\/p><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"c32c08d9-dddc-4d8f-922f-2d7f7bd2f8d6\">\u8457\u8005<\/h2><p><strong>\u30b8\u30a7\u30b7\u30fc\u30fb\u30b7\u30e5\u30fc<\/strong>&nbsp;\u2014 Senior Quality Engineer, QA (Quality Assurance),&nbsp;<strong>Maxtor Metal<\/strong><\/p><ul><li><strong>\u7d4c\u9a13\uff1a<\/strong>&nbsp;15 years in quality engineering, with hands-on&nbsp;<em>failure analysis<\/em>&nbsp;experience to distinguish whether edge chipping or rapid wear is driven by heat-treatment process variation versus material segregation.<\/li>\n\n<li><strong>\u8a8d\u5b9a\u8cc7\u683c:<\/strong>&nbsp;ASQ\u2013CQE, ISO 9001 Lead Auditor, ASNT Level II<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>Urschel-style dicer heads operate under demanding cyclic loading: blade bands contact product at high frequency, with impact severity varying significantly between soft fresh produce and hard frozen product (IQF frozen vegetables and root crops can present surface hardness comparable to hardened wood). Cut-size capability and blade life are directly coupled\u2014a band that chips on the first frozen cycle introduces dimensional scatter on every subsequent cut. That&#8217;s why material qualification for this application is not just a hardness specification: it&#8217;s a validated process window that holds up across the full product mix the line runs. If you\u2019re qualifying replacement dicer bands for an Urschel-style head, 440C is often the \u201cworks when [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7638,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1274,1],"tags":[1273],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Urschel Dicer Replacement Blades: 440C QA Guide<\/title>\n<meta name=\"description\" content=\"Qualify 440C Urschel dicer replacement blades at HRC 56\u201358: heat-treat window, RA control, ASTM QA protocol, and trial KPIs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/maxtormetal.com\/ja\/urschel-dicer-replacement-blades-440c-hrc-56-58-qa\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Validating 440C Urschel Dicer Replacement Blades at HRC 56\u201358: Heat-Treatment Window, RA Control, and QA Protocol\" \/>\n<meta property=\"og:description\" content=\"Qualify 440C Urschel dicer replacement blades at HRC 56\u201358: heat-treat window, RA control, ASTM QA protocol, and trial KPIs.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/maxtormetal.com\/ja\/urschel-dicer-replacement-blades-440c-hrc-56-58-qa\/\" \/>\n<meta property=\"og:site_name\" content=\"Maxtor Metal | Custom Industrial Blade Manufacturer &amp; 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