Mill Test Certificate Sample
A stock-data-pending, field-by-field guide buyers can use until the redacted sample PDF is available.
A Mill Test Certificate is the buyer's proof that steel pipe came from a specific heat, meets the ordered grade, and passed required checks. Use this annotated sample to verify chemistry, mechanical values, dimensions, test results, and authorized sign-off.
Annotated MTC layout
The client has not yet provided the redacted MTC PDF, so this HTML diagram shows the usual placement of fields on a typical mill certificate. Real mills format certificates differently, but the same traceability blocks should still be present and readable.
Issuer, date, standard, order reference.
Traceability code to match on pipe bundles.
Pipe type, size, wall, grade, standard, quantity, and supply condition.
Hydro, NDT, visual, impact, or supplementary tests.
Authorized sign-off, stamp, date, and remarks.
Field-by-field explanation
Mill name, works address, certificate number, issue date, page count, and referenced order. This proves who issued the certificate and which document version you are reviewing.
Pipe or tube description, OD, wall thickness, length, manufacturing process, grade, standard, and supply condition. This should mirror your PO line, not a similar commercial item.
The traceability key that connects the finished pipe back to the steel melt. The same number should appear on bundle tags, stencils, and dispatch paperwork.
Element percentages such as C, Mn, P, S, Si, Cr, Mo, Ni, or V. Buyers compare these against IS, ASTM, EN, DIN, API, or boiler-grade limits.
Yield strength, tensile strength, elongation, hardness, bend, flattening, or drift expansion. These values show whether the steel can carry the required load or pressure.
Measured OD, wall thickness, length, ovality, straightness, weight, surface condition, bevel, threading, slotting, or honed-bore finish depending on product type.
Hydrostatic pressure, eddy current, ultrasonic, visual, impact, IBR, or supplementary test results. The MTC should state pass/fail or actual values, not only generic wording.
Authorized quality sign-off, stamp, and date. For critical orders, compare this with TPI release notes and ask for clarification before accepting unclear scans.
How to verify your MTC
Match the heat number
Compare the heat number on the MTC with the stencil, tag, or paint marking on each pipe bundle.
Confirm the specification
Check that the MTC standard, grade, size, and wall thickness match the purchase order and approved drawing.
Read chemistry against the standard
Verify carbon, manganese, sulphur, phosphorus, silicon, and alloy values against the maximum and minimum limits in the applicable code.
Check mechanical values
Confirm yield strength, tensile strength, elongation, hardness, and bend or flattening results meet the required grade.
Review dimensional and pressure tests
Confirm OD, wall, length, straightness, visual inspection, hydrostatic pressure, NDT, or eddy-current results as applicable.
Validate issue authority
Check mill name, certificate number, date, inspector signature, stamp, and any third-party release note before dispatch approval.
EN 10204 Type 3.1 vs Type 3.2
The inspection type — Type 3.1 or Type 3.2 — is the single most-confused MTC variable on Indian POs. Both formats record the same chemistry, mechanicals, and tests; the difference is who signs off and how independent that sign-off is.
| Type | Who certifies | Independence | Common use case |
|---|---|---|---|
| Type 3.1 | The manufacturing mill itself (independent QA function within the mill) | Internal to the mill — the inspector is on the mill payroll but operationally independent from production | The default for most domestic Indian B2B procurement and standard project work |
| Type 3.2 | Both the mill and a recognised third-party inspector (TÜV, Bureau Veritas, SGS, Lloyd's) | Genuinely external — the third-party countersigns after witnessing the tests | Export orders, IBR boiler scope, NACE sour-service, high-spec EPC tenders |
See the dedicated EN 10204 3.1 vs 3.2 reference page for the full clause-by-clause comparison and a worked example of when retro-fitting 3.2 to a 3.1 batch is — and is not — feasible.
Frequently asked questions
What is a Mill Test Certificate?
What is the difference between EN 10204 Type 3.1 and Type 3.2 MTC?
Why does the heat number on the MTC matter?
Do you supply MTCs with every dispatch?
Common buyer mistakes
Do not accept a certificate only because the grade name looks familiar. Check whether the size, standard year, heat number, and test route match your purchase order. A certificate for a different heat cannot prove the bundle you receive, even when the grade is identical.
Also verify dispatch readiness. Pair the MTC with the ready-stock page, ask how we ship through the freight and delivery guide, and keep the certificate, invoice, e-way bill, weighbridge slip, and TPI release note together for your project file.
Buying pipe for a documented project?
Share the required grade, certificate type, inspection clause, and destination so RP Sales can match material and paperwork together.