How to Trace a Heat Number Back to Its Mill Certificate

To trace a heat number, follow it from the marked material through goods-in and stock records. End at the matching mill certificate, and check the producer too. A heat number alone won’t prove the link.

This guide covers one job: the check you run on one delivery at goods-in. For a tool comparison, read AI assistants that understand heat numbers. For the programme-level view, read digital traceability best practices.

Hunting through Portable Document Format (PDF) folders burns time and leaves your quality team chasing paperwork.

MillCert Reader helps you find linked mill certificates. It is part of GoSmarter, built by Nightingale HQ. Its AI Optical Character Recognition (OCR) extracts certificate fields for review. It sits on top of your existing Enterprise Resource Planning (ERP) system, spreadsheets and email, so there is no rip-and-replace. Your quality team still checks the match and approves release.

We’ll show you how to:

• Link physical markings, receipt records and certificates.
• Check the required document, including EN 10204 Type 3.1 where specified.
• Keep stock on hold when the records don’t match.

A heat number is the identifier a mill gives to one melt of steel. It links a piece of metal to the mill certificate that records that melt’s chemistry and test results. Our glossary defines the other terms used here.

Let’s follow the trail from the metal.

Watch How Heat Numbers, Test Reports and Positive Material Identification Fit Together

Trace Receiving Records to the Mill Certificate

Record the marking first. Then follow the receipt trail from the heat number to the exact receipt and its certificate. Full traceability means you can name the heat number, mill, certificate and purchase order for any stock item.[1]

• Open the stock record and linked goods-in entry for the heat number.
• Confirm the purchase order and supplier. Check the order line, mill, description and certificate type.
• Check the delivery note and receiving date. Reconcile the quantity received, including partial deliveries.
• Find the certificate. Search by certificate reference first. Then try the heat number, supplier document number, purchase order or delivery note.
• Compare the identifiers with the stock. Match the producer, heat number, grade, specification and product form.

If any field breaks the chain, stop. Correct the record before you release the material.

Match Stock, Delivery and Certificate Records

Use this checklist to spot missing links.

Reconcile quantities per receipt, not against the full order. Explain any cuts, transfers or shortages in the record.

If a stockist or intermediary supplied the material, keep the manufacturer’s original certificate or an unaltered copy. Link it to the delivery with a reference.[2] One certificate can list several heats. In that case, you need a clear mapping between each heat and the quantity shipped.[3]

If the certificate details don’t match, hold the material for quality review. Once the receipt chain matches, check the certificate details before you release the material.

Validate the Certificate Before Releasing Material

Once the receipt chain checks out, compare the certificate with the order. Identity links the certificate to the material. Conformance confirms the material meets the order, drawing and standard.[4][5]

Check Material Identity and Test Results

Check which inspection document the order requires. Use EN 10204 Type 3.1 when the order needs test results for the supplied heat, batch or lot. The manufacturer’s representative signs it. That representative must work independently of the manufacturing department.[4][5]

Use this checklist to check identity and conformance in one pass.

Read the mechanical results with the test basis in mind. Yield strength is reported as ReH where the steel shows a distinct yield point. Otherwise the certificate gives Rp0.2, the stress at 0.2% plastic deformation.[6][7] One producer’s data sheet states elongation as A80 for thicknesses under 3 mm and A5 for 3 mm and over. The same sheet states the tensile test direction as transverse to rolling.[6] Gauge length rules vary by country and specimen type, so compare like with like.[8] Guaranteed values also depend on plate thickness. For thick plate, one producer gives separate yield values at quarter and half thickness.[9]

Hold Material When Records Do Not Match

If any field fails, stop release and investigate. A near match isn’t enough.

• Stop release: Put the material on hold in your inventory or quality system. Prevent cutting, fabrication or release.
• Compare the evidence: Check heat, bundle, plate, batch and delivery identifiers. Compare the material, packing list, delivery note, receiving record and stock system.
• Request controlled documentation: Ask the supplier or mill for the missing or corrected certificate. Failing that, ask for written clarification.
• Get the supporting link: Request bundle lists, mill production records, dispatch records or a documented cross-reference where identifiers differ.
• Record the investigation: Keep the discrepancy, correspondence, corrections and final disposition. Don’t substitute a certificate just because the grade, dimensions or supplier name appear to match.

Get Quality Approval for Release

Record the material ID, heat, certificate number, purchase order, evidence reviewed, approver and approval date.

Find Mill Certificates with MillCert Reader

If your traceability record is already digital, use MillCert Reader to find certificates faster. This post stops at the goods-in check. For approval locking, stock reservation and customer certificate packs, read the end-to-end certificate workflow.

Upload the original PDF or image to GoSmarter’s Mill Certificates workspace. It extracts structured certificate data for you to review next to the source file.[10] Check the heat number, producer, grade, specification and test results first.[5][11] Keep the PDF linked to the certificate number and supplier reference.

GoSmarter links certificates to inventory automatically when the heat codes match. The match ignores letter case, so keep the heat code format consistent. You can then retrieve the linked PDF by heat code.[10]

When you cut stock, record each offcut as a new inventory item of the same material. Link it to the original heat’s certificate.[12]

Keep Certificate Checks and Approval with Quality

Before release, your quality team must compare extracted fields with the mill test certificate and physical marking. Extracted data is not approved material.

Smudged scans, handwritten entries and poor page condition can cause extraction errors.[10][13] Image quality, such as blur and glare, also affects OCR accuracy.[14] Watch for lookalike characters such as ‘0’ and ‘O’, or ‘5’ and ‘S’. Resolve doubts using physical markings and supplier records. Don’t just accept a suggested match.

The certificate must match the marked heat. If the heat number on the material doesn’t match, quarantine the material and raise a non-conformance.[5][15] If several certificates match, or none matches reliably, keep the stock on hold. Wait until the supplier or mill provides a corrected certificate or written clarification.

Trial MillCert Reader on Your Next Delivery

Once you have the receipt chain and certificate match in place, test the process on one delivery. Before receipt, name the receiving operator, quality approver and a deputy for each.

Upload the delivery’s mill test certificate to MillCert Reader and link it to the inventory record. A 7-day free trial, then 50% off your first month: £90 on Starter.

Release items only after documented quality approval. Hold unresolved items. Attach the mismatched identifiers and supplier correspondence to the record so you keep the details together.

Measure the trial’s speed and exception rate. Record both receipt-to-certificate time and certificate-to-decision time. Compare them with your current search time for the same delivery. At trial close, count unresolved discrepancies and records needing manual review. Use those results to refine the next delivery’s checks.

MillCert Reader sits in the Workshop plan at £350/month rolling, or £280/month billed annually. Using the Midland Steel figures, the saved admin time recovers the upfront annual fee in about 11 months. See the pricing page and the ROI worked example for the inputs.

For your IT team, GoSmarter exports certificate and stock records as CSV. You can also use the REST API (Representational State Transfer Application Programming Interface). GoSmarter stores your data on Microsoft Azure in UK data centres. We use uploaded certificates, de-identified, to improve our own extraction models. We never share them with other customers or third-party AI providers. Microsoft does not train on your data.

FAQs

References

1. GoSmarter Documentation, What is Steel Traceability? From Mill to Customer
2. PITECH Industrial Solution, Metal Part Traceability: EN 10204 Certificates and PMI
3. NTIA, Heat Numbers, Traceability and Certificate Matching: How to Keep Materials Linked to Their MTCs
4. British Stainless Steel Association, BS EN 10204 test certificates for stainless steel products
5. Forgepoint, Understanding Mill Certificates: What to Check and Why They Matter
6. voestalpine Grobblech, alform normalized rolled steels data sheet (archived copy)
7. Wikipedia, Yield (engineering)
8. Wikipedia, Tensile testing
9. voestalpine Grobblech, alform thermomechanically rolled fine-grained steels brochure, 01/2024 (archived copy)
10. GoSmarter Documentation, Digitise your mill certificates / MTRs
11. MetalNow, How to Read a Mill Certificate: A Line-by-Line Guide
12. GoSmarter Documentation, Managing Inventory and Daily Operations with GoSmarter
13. GoSmarter Documentation, Digitising Mill Certificates and Ensuring Compliance
14. Google Cloud, Enterprise Document OCR
15. testcert.co, How to Prove Material Traceability in an Audit
16. GoSmarter Documentation, What is a Heat Number in Steel? Traceability From the Mill