How to Verify a Mill Test Report (MTR) — Authentication Step-by-Step

EN 10204 defines 4 levels of mill test certificate, with very different reliability:

- **Type 2.1 — Declaration of compliance**: Mill states material complies with order, no test data. Worth approximately nothing. - **Type 2.2 — Test report**: Mill states material complies, includes some test data, but tests may not be on the actual material delivered. Mostly worthless. - **Type 3.1 — Inspection certificate**: Test data on the actual material delivered, validated by mill's quality department (an internal inspector independent of production). This is the minimum acceptable for B2B steel — virtually all B2B contracts require 3.1 or above. - **Type 3.2 — Inspection certificate**: Same as 3.1 but countersigned by an independent third-party inspector or buyer's representative. Required for critical applications (nuclear, offshore, aerospace, sometimes pressure vessels).

If an MTR is only type 2.1 or 2.2, reject it — those types are essentially marketing claims with no testing rigor. Demand 3.1 minimum.

The 'heat number' (or 'heat code', 'cast number') is a unique alphanumeric identifier assigned to each melt batch at the steel mill. A typical heat batch is 100-200 metric tons of steel that all share identical chemistry — the same molten steel poured at the same time.

Every MTR for steel from a heat must reference that heat number. Every coil/bar/plate from that heat carries the same heat number — typically stamped, painted, or tagged on the material.

**Key rule: heat number must be CONSISTENT across the entire shipment, the MTR, and the physical material.**

If you receive a coil tagged 'Heat 2024-05-A1234' but the MTR says 'Heat 2024-05-B5678' — that's a red flag. The coil was either mis-labeled (sloppy) or substituted (fraud). Stop the shipment and demand explanation.

When sourcing from us, every coil ships with: (1) physical heat number tag on the coil, (2) heat number on the MTR, (3) heat number in our customer portal — all three must match. We can also provide chemistry-verification swabs from the actual coils for third-party lab cross-check.

When you receive an MTR, run these 8 checks:

**Step 1: Cert type check** — Is it EN 10204 type 3.1 or 3.2? (Rare cases accept 'CMTR' US equivalent.) Reject 2.1/2.2.

**Step 2: Issuer verification** — Is the mill name and logo correct? Does the address/contact match the mill's official website? (Major mills: Jingye, HBIS, Baosteel, Shansteel, ArcelorMittal, Nippon Steel, etc. — all have published contacts.) Search 'mill name + cert verification' to find their authentication portal.

**Step 3: Heat number sanity check** — Is it a real-looking alphanumeric (typically 6-12 characters)? Same heat appears on multiple sub-items (coils/lots) of the same shipment? Heat numbers all blank or sequential = red flag.

**Step 4: Chemistry cross-check** — Do all chemistry values fall within the standard's limits? E.g., for HRB400: C ≤ 0.25%, Mn ≤ 1.60%, P ≤ 0.045%, S ≤ 0.045%. If a value is outside the limit, the cert is wrong (or fake).

**Step 5: Mechanical property cross-check** — Yield, tensile, elongation within the standard's required minimums. Bend test pass.

**Step 6: Signature & stamp** — Inspector name, signature, mill stamp. For type 3.2, additional independent inspector signature required.

**Step 7: Direct mill contact** — Email or call the mill's quality dept with the heat number. Reputable mills will confirm the cert exists in their database within 1-2 days. Most major mills have an online cert verification portal with QR codes — we provide this for our coils.

**Step 8: Third-party verification (for critical orders)** — Engage SGS, Bureau Veritas, or Intertek to take material samples and run chemistry/mechanicals at their accredited lab. Cross-check against the MTR. Discrepancies > 5% indicate substituted material.

These signs indicate the MTR may be fake or the material substituted:

- Heat number missing or generic (e.g., 'H001', '2024') - Chemistry values too perfect (e.g., all values exactly at the standard's nominal — real heats have variation) - Chemistry values inconsistent with the typical heat (e.g., low C with high Mn that doesn't match the grade) - Mechanical properties at exactly the minimum required (suspicious — real production typically has margin) - Inspector signature is generic ('QC Manager') with no name - Mill name with poor logo or unprofessional formatting - Mill listed isn't a real producer of the grade claimed - MTR is a JPG or scanned image rather than searchable PDF - Multiple shipments use the same heat number (suspicious if they differ in size/grade) - Mill won't respond to direct verification requests

If you see 3 or more of these, treat the cert as unreliable until verified independently.

Top-tier modern steel mills increasingly support online MTR verification:

1. **QR code on each MTR** — scans to a URL like 'mill.com/verify?heat=2024-05-A1234' 2. **Heat-number lookup portal** — buyer inputs heat number on mill's website, gets cert PDF 3. **API access** — for large buyers, programmatic verification of bulk orders 4. **Blockchain-anchored certs** (emerging) — cert hash recorded on blockchain for tamper-proof verification

When sourcing from us, every MTR includes a QR code linking to our partner mill's verification portal — you can independently confirm authenticity in 30 seconds. We also maintain heat-number traceability in our customer portal so you can see your specific coil's MTR alongside its container loading photos and ship tracking.

If your authentication checks raise red flags:

1. **Pause acceptance** — do not unload or accept the shipment until resolved. 2. **Notify your supplier in writing** — describe the specific concerns (heat number mismatch, chemistry inconsistency, etc.). 3. **Request additional documentation** — original mill records for the heat number, mill's confirmation of the cert. 4. **Engage third-party inspection** — SGS/BV/Intertek to take material samples and run independent lab analysis. Cost: typically $300-1500 depending on scope. 5. **If verified fake**: file a claim per your contract terms. Most reputable suppliers (including us) carry liability insurance and will provide replacement material. If escrow was used, hold release until resolution. 6. **Document everything** — photos of material, heat number tags, communications, lab results. Important for any legal recourse.

The best protection is buying from suppliers who proactively support verification (live cert portals, third-party inspection welcomed) — fraud is significantly less likely from a supplier who has chosen to be verifiable from day one.