Membaca MTC Baja Perkakas untuk Pisau Strip: Checklist QA Praktis untuk Komposisi Kimia, Kekerasan, dan Penelusuran

Jawaban Cepat: Untuk membaca MTC baja perkakas untuk pisau pemotong strip, mulailah dari bagian header — konfirmasi jenis sertifikat EN 10204 3.1, identitas pemasok, grade baja, dan nomor peleburan (heat number). Kemudian, cocokkan tabel komposisi kimia dengan PO/spesifikasi Anda (menggunakan ASTM A681 atau ISO 4957 sebagai standar acuan). Verifikasi keseragaman kekerasan dengan peta 9 titik (ujung depan/tengah/ujung belakang × tepi/tengah/tepi per ASTM E18), dan tambahkan pemeriksaan dekarburisasi (ASTM E1077) ketika performa tepi potong sangat kritis. Nomor peleburan harus menghubungkan MTC, tag kumparan (coil tag), dan catatan lot internal Anda untuk membentuk rantai penelusuran yang lengkap.

Dalam manufaktur pisau pemotong strip, MTC baja perkakas hanya berguna jika membantu Anda membuat keputusan penerimaan barang yang cepat dan dapat dipertanggungjawabkan — serta jika Anda tetap dapat membuktikan penelusuran setelah kumparan (coil) dibelah (slit), digerinda, dan dikonversi menjadi lot internal. Checklist praktis ini disiapkan oleh Tim QA & Rekayasa Metalurgi Maxtor Metal, berdasarkan pengalaman terspesialisasi selama lebih dari 15 tahun dalam manufaktur pisau industri, pemilihan baja kustom, dan protokol kontrol kualitas yang ketat saat menyelaraskan dokumen, penandaan (tagging), dan verifikasi antara pemasok dan pembeli.

• Tujuan: enable fast, reliable acceptance decisions for strip blades
• Cakupan: EN 10204 3.1 focus (EN 10204 3.1 certificate), heat number, chemistry, hardness uniformity
• Standards referenced: EN 10204, ASTM E18, ASTM E1077, ASTM A681/ISO 4957
• Why reading tool steel MTC matters to QA, uptime, and FPY
• How this checklist reduces retests, scrap, and downtime

Key takeaway: Treat the MTC as the starting point for acceptance: it anchors traceability and declared results, but your receiving checks decide whether the coil is safe to process.

Dasar-dasar Sertifikat MTC

What an EN 10204 3.1 covers

An EN 10204 Type 3.1 inspection certificate is the common “mill test certificate / material test certificate” format used in metals supply. In simple terms, it’s the manufacturer’s declaration that the delivered product complies with the order, and it includes test results tied to the test unit.

This is the EN 10204 3.1 certificate your traceability system ultimately points back to.

For the formal definitions and document types, refer to EN 10204:2004 directly—available through official standards bodies such as BSI (EN 10204:2004) or your regional standards authority. The standard defines all document types (2.1, 2.2, 3.1, 3.2) and the authorization requirements for each.

Checklist (3.1 basics):

• Certificate type is explicitly shown as EN 10204 3.1.
• It includes measured results (not just “conforms”).
• It is signed/validated by the manufacturer’s authorized inspection representative.

Heat number and traceability linkage

For strip blades, the heat number is the shortest path to “Do we know exactly what this coil is?” It is the core of heat number traceability in coil-based supply. It should link:

• the MTC (declared chemistry + tests)
• the coil tag / packaging label
• your receiving record
• the internal lot numbers you create after slitting, leveling, or edge preparation

Receiving checklist (traceability linkage):

• Heat number on MTC matches the heat/heat-lot shown on the coil tag.
• Coil identifier (coil no., tag no., reel no.) is recorded on your receiving log.
• Your internal lot IDs inherit the heat number and keep it attached through WIP.

3.1 vs 3.2 vs 2.2

Use this as a decision shortcut:

• 2.2: declaration of compliance based on non-specific inspection (good for low-risk use; limited for audits).
• 3.1: manufacturer-issued inspection certificate with test results (typical baseline for industrial tool steels).
• 3.2: inspection certificate with third-party or purchaser’s representative involvement/witnessing (use when the risk or contract demands it).

Cara memverifikasi komposisi kimia pada MTC baja perkakas — dan kapan harus melampaui analisis PMI

D2/M2/O1 acceptance bands

A tool steel MTC is not “good” because it lists numbers—it’s good because the numbers match what you ordered.

Practical acceptance rule:

• Your acceptance bands should come from your PO/spec callout, typically referencing a tool-steel material standard such as ASTM A681 atau ISO 4957:2018.

Reference source: ASTM A681 / ISO 4957 standard chemistry composition limits.

Checklist (chemistry acceptance):

• Grade is stated clearly (e.g., D2, M2, O1) and matches the PO.
• Chemistry table includes the critical alloying elements for that grade.
• Heat number on the chemistry report matches the heat number on the certificate header.

For a detailed framework on how material grade validation — including heat-treatment batch records and XRD-based retained austenite verification — is specified for blade strip steel at the incoming stage, see Validasi Pisau Pengganti 440C Dicer pada HRC 56–58.

Pro tip: For incoming coils intended for strip blades, set a “stop the line” rule for grade ambiguity (for example, ambiguous equivalents or missing grade designation). It’s almost always cheaper than chasing performance scatter later.

PMI vs spark-OES/ICP-OES

Positive Material Identification (PMI) is often treated as a universal answer. It isn’t.

• PMI/XRF is strong for confirming alloy family and many elements, but it’s limited for carbon.
• Spark-OES and ICP-OES are typically used when you need more complete chemistry, including carbon-critical acceptance decisions.

Checklist (use the right method):

• Use PMI/XRF to screen: “Is this broadly the correct alloy family?”
• Use spark-OES or ICP-OES when the acceptance hinges on carbon-sensitive outcomes (hardness response, carbide network behavior), or when the contract requires lab confirmation.
• Document the method and instrument ID in the receiving record so results are auditable.

Resolve discrepancies to PO/spec

When chemistry results conflict (MTC vs your test vs supplier re-test), the fastest way to avoid downtime is to follow a written escalation path.

Discrepancy-resolution checklist:

1. Freeze the identity: confirm heat number + coil tag + sample location (head/mid/tail).
2. Confirm the reference: pull the PO/spec revision and identify which standard governs (e.g., ASTM A681 / ISO 4957).
3. Confirm methods: PMI vs OES vs ICP-OES; note detection limits and whether carbon was actually measured.
4. Re-sample intentionally: take a second sample from a different location and document chain-of-custody.
5. Decide action: accept, hold for disposition, downgrade use, or reject—based on the governing spec and risk.

Mengapa keseragaman kekerasan lebih penting daripada nilai rata-rata — dan cara memetakkannya pada strip

For Rockwell testing, cite the official method: ASTM E18 Rockwell hardness test method. For practical context on why thickness/support matter, NIST’s guidance is a useful companion: NIST Rockwell hardness recommended practice.

Supply condition: Annealed vs. Pre-hardened

Before evaluating hardness values, clarify the delivery state on the PO/MTC:

• Annealed strip (Soft): Shipped in a spheroidized annealed state for severe forming, slitting, or punching before final heat treatment.
• Pre-hardened / Hardened & Tempered strip: Delivered at working hardness for direct grinding, edging, or light slitting without subsequent full quenching.

Mixing up delivery conditions is a common source of false rejects and false accepts — always confirm with the MTC header what condition the material is in before applying any hardness acceptance limit.

Strip sampling map: edge–center–edge; head/mid/tail

Hardness scatter in strip often hides in two directions:

• Across the width (edge-to-edge differences from processing, decarb, or leveling)
• Along the length (head/mid/tail differences from heat treatment variation or coil-end effects)

Checklist (minimum map that still finds problems):

• Sample at head / mid / tail.
• At each length position, test edge / center / edge.
• Record location IDs so a future complaint can be traced back to the zone.

Setup validity: thickness, spacing, support

A hardness number is only actionable if the test setup is valid for the strip geometry.

Setup checklist:

• Confirm you are using a Rockwell scale appropriate for the strip thickness.
• Ensure the specimen is flat and well supported on the proper anvil; avoid rocking.
• Keep indentations far enough from edges and from each other to avoid interaction.
• If your strip is thin, don’t “solve it” by stacking layers—control the method instead.

Interpret spread and actions

Don’t just look at the average. Look at the spread.

Interpretation checklist:

• If head/mid/tail shift together, suspect batch heat treatment atau process-window drift.
• If edges are consistently lower than center, suspect decarburization or edge conditioning effects.
• If one zone is off, isolate that zone in WIP routing (don’t blend lots).

Action checklist:

• Accept: hardness meets PO targets and spread is within your internal control limit.
• Hold / retest: hardness is borderline or spread suggests a localized issue.
• Reject / disposition: hardness is out of spec, or spread indicates non-uniformity that will create FPY loss.

Dekarburisasi dan keseragaman

Detect and measure per ASTM E1077

If strip edges are soft, chip early, or don’t hold a stable grind, decarburization is a prime suspect—especially in thin sections where the surface zone is a larger fraction of the cross-section.

ASTM’s method for estimating decarb depth is ASTM E1077 — Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens.

Checklist (what to request/report):

• Sample location and orientation (edge vs center; head/mid/tail if relevant).
• Whether results are reported as total dan partial decarburization depth.
• Metallography prep and etching method (so results are comparable across labs).

Impact on hardness and mitigation

Decarb turns into performance scatter because it shifts the hardness profile near the working surface.

Impact checklist:

• Softer surface zone → faster wear, unstable edge, unpredictable grinding response.
• Edge zone affected → failures show up as chipping or rapid dulling even when “bulk hardness” looks OK.

Mitigation checklist:

• Set decarb limits on the PO when the application is edge-sensitive.
• Control incoming verification for high-risk lots (new supplier, process change, unusual thickness).
• After secondary processing (slitting, grinding, heat treatment), re-verify hardness and surface condition before releasing to production.

SOP Dokumentasi dan Penelusuran

Link MTC, coil tags, internal lots

A practical SOP connects physical identity to records so you can pass audits and also troubleshoot downtime quickly.

Checklist (minimum traceability chain):

• Archive the MTC PDF with a filename that includes supplier + grade + heat number.
• Photograph or scan the coil tag on receipt.
• Assign internal lot numbers that preserve the heat number association.

Catatan Teknik: If your traceability SOP needs to align with coil supply format specifications — including reel dimensions, lot splitting conventions, and documentation requirements — see Maxtor Metal’s reference page on Baja strip pisau industri dalam gulungan miring for form-factor and traceability documentation standards.

If your traceability review also involves coil length planning and changeover scheduling, see OEE and Profit Gains from Reducing Coil Change Frequency for the supply-side consistency controls that make longer runs reliable.

Retest records and change control

Retests are unavoidable; uncontrolled retests are expensive.

Checklist (retest discipline):

• Record retest triggers (what failed, where, and why you retested).
• Store test method, instrument, operator, and sample location.
• Tie retest results to a disposition decision (accept/hold/reject) and keep the revision history.
• If the PO/spec changes, lock the revision used for acceptance of each lot.

Supplier collaboration for verification

Collaboration here doesn’t mean marketing—it means preventing “paper-compliant, performance-unstable” material from entering production.

Practical collaboration checklist:

• Align on what the 3.1 must include (heat no., grade/spec callout, chemistry, hardness where applicable).
• Agree on a discrepancy path: who re-tests, with what method, and how chain-of-custody is documented.
• Lock a shared definition of “equivalent grade” acceptance (or forbid it unless approved).

Maxtor Metal provides customers with pre-aligned documentation packages — including certificate format templates, coil tag conventions, and verification record structures — so that traceability decisions remain consistent after slitting, leveling, and lot splitting. Customers running formal incoming QA programs can request the documentation alignment checklist from the Maxtor Metal technical team before the first shipment.

Audit & Re-verification Triggers

To prevent quality issues from slipping into production, establish clear conditions that trigger a mandatory joint audit or secondary lab re-verification:

• New Supplier / Subcontractor First Lot: Mandatory complete chemistry (OES) and 9-point hardness mapping on the initial 3 production heats.
• Process Change Notification (PCN): Any declared change in supplier annealing, heat treatment furnace, or slitting line parameters.
• Consecutive Hardness or Microstructure Deviations: Occurrence of edge-to-center hardness scatter exceeding ±1.5 HRC across 3 consecutive coil lots.
• Unexplained Production Tooling Failures: Immediate joint root-cause review if field blades exhibit premature micro-chipping or rapid edge dulling despite “paper-compliant” MTCs.

FAQs:

T: Bagaimana cara membaca MTC baja perkakas untuk pisau pemotong strip dengan cepat?

J: Mulailah dari bagian header: konfirmasi EN 10204 3.1, pemasok, grade baja, dan nomor peleburan. Kemudian verifikasi bahwa tabel kimia sesuai dengan PO/spesifikasi Anda dan nomor peleburan terhubung ke tag kumparan. Terakhir, validasi keseragaman kekerasan dengan peta sederhana (ujung depan/tengah/ujung belakang × tepi/tengah/tepi).

T: Apa perbedaan antara sertifikat EN 10204 3.1 dan 3.2?

J: Sertifikat 3.1 diterbitkan oleh produsen beserta hasil pengujian dan ditandatangani oleh perwakilan inspeksi yang berwenang. Sertifikat 3.2 menambahkan keterlibatan pihak independen (pihak ketiga atau perwakilan pembeli) tergantung pada persyaratan kontrak. Ketika risiko lebih tinggi atau audit lebih ketat, sertifikat 3.2 lebih sering digunakan.

T: Bisakah PMI/XRF memverifikasi baja perkakas D2 atau M2 secara akurat?

J: PMI/XRF berguna untuk mengonfirmasi kelompok paduan dan banyak elemen paduan, tetapi memiliki keterbatasan untuk unsur karbon. Jika penerimaan barang Anda bergantung pada perilaku yang sensitif terhadap karbon (respon kekerasan, ketahanan aus), gunakan spark-OES atau ICP-OES sesuai SOP Anda.

T: Berapa banyak titik uji kekerasan Rockwell yang saya perlukan pada kumparan (coil) strip baja?

J: Gunakan peta yang dapat mendeteksi variasi lebar dan panjang: ujung depan/tengah/ujung belakang di sepanjang kumparan, dan tepi/tengah/tepi di seluruh lebar. Ini memberikan sembilan titik sebagai minimum praktis untuk skrining keseragaman; tambahkan titik jika riwayat proses Anda menunjukkan sebaran terisolasi (localized scatter).

T: Apa yang menyebabkan variasi kekerasan dari tepi ke tengah pada pisau pemotong strip?

J: Penyebab umum meliputi perbedaan kondisi permukaan, dekarburisasi di dekat tepi, dan ketidakseragaman pemrosesan. Sinyal yang sering muncul adalah "tepi rendah, tengah OK". Jika pola tersebut muncul, tambahkan pemeriksaan dekarburisasi dan perketat dokumentasi lokasi pengambilan sampel.

T: Untuk apa ASTM E1077 digunakan dalam QA baja perkakas?

J: ASTM E1077 digunakan untuk mengestimasi kedalaman dekarburisasi pada sampel baja. Dalam praktiknya, standar ini mendukung keputusan penerimaan dan analisis akar masalah (root-cause) ketika kelembutan permukaan memengaruhi kinerja pisau, terutama pada strip tipis di mana area zona permukaan jauh lebih penting.

T: Apa yang harus saya lakukan jika kimia MTC sesuai tetapi uji kekerasan gagal?

J: Tahan (hold) lot barang dan verifikasi validitas pengujian terlebih dahulu (kesesuaian skala/ketebalan, penopang, jarak titik uji, dan preparasi sampel). Jika pengujian valid, perlakukan sebagai ketidaksesuaian (nonconformance): ambil sampel ulang dengan dokumentasi rantai pengawasan (chain-of-custody), bandingkan dengan persyaratan PO/spesifikasi, dan tentukan disposisi lot (terima dengan pembatasan, penurunan kelas penggunaan, atau tolak).

T: Apakah saya perlu memverifikasi ulang setelah proses slitting atau penggerindaan (grinding)?

J: Ya, jika langkah-langkah tersebut mengubah rantai identitas (pembagian lot) atau mengubah permukaan kerja. Verifikasi ulang setidaknya keterlacakan (nomor peleburan ke lot internal) serta kekerasan/kondisi permukaan berdasarkan analisis risiko—terutama setelah penggerindaan atau perlakuan panas.

Kesimpulan

A clean checklist is only valuable if it reduces real waste: fewer retests, fewer surprises on the grinder, and fewer unplanned stops in production. The acceptance path covered in this guide comes down to four linked checks: confirm the EN 10204 3.1 certificate is correctly issued and signed; verify chemistry against PO/spec with the right method (PMI for screening, OES/ICP for carbon-critical decisions); map hardness at head/mid/tail × edge/center/edge and interpret the spread, not just the average; and verify decarburization depth when the application is edge-sensitive.

Traceability is what ties these checks together. If you can connect the MTC heat number to the coil tag, to your receiving log, and through to internal lot numbers after slitting or grinding—you have a defensible QA record. If any link in that chain is missing, you have paperwork, not traceability. Re-verify hardness and surface condition after any secondary process (slitting, grinding, heat treatment) that changes the working surface or splits the lot identity.

Consistent results require consistent identity. That’s the same internal discipline we apply at Maxtor Metal when aligning documentation and verification steps between supplier and buyer.

Author Bio

Jesse Xu
Senior Quality Engineer | Maxtor Metal (QA Department)

Jesse Xu is a Senior Quality Engineer at Maxtor Metal with over 15 years of hands-on experience in tool steel metallurgical quality assurance, material inspection, and failure analysis. Specializing in diagnosing complex blade performance issues—such as distinguishing heat treatment defects from material segregation in chipping and premature wear—he helps global equipment manufacturers ensure total quality from raw material receiving to finished precision cutting tools. Jesse holds prestigious industry credentials, including ASQ CQE (Certified Quality Engineer), ISO 9001 Lead Auditor, Dan ASNT Level II certifications.