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A mill test certificate is the document that ties the material you received to the heat it was made from, and records that it meets the specification you ordered against. For project, audit and pressure- equipment work it is not paperwork — it is the evidence the material is what the drawing called for.
The distinction people miss: an MTC reports the actual measured values for your heat, not the specification limits. A published composition table tells you 316 permits 2.00–3.00% molybdenum. The certificate tells you your batch contained, say, 2.14%.
EN 10204 defines the types of inspection document. The distinction between them is who verified the results and how independent they were — not how detailed the document looks.
| Type | Name | What it actually means |
|---|---|---|
| 2.1 | Declaration of compliance | The manufacturer states the material meets the order. No test results are given. |
| 2.2 | Test report | Results from non-specific inspection — typical values from production, not necessarily from your batch. |
| 3.1 | Inspection certificate 3.1 | Results of specific inspection on the material supplied, validated by the manufacturer's own inspection representative, who must be independent of the manufacturing department. This is what most project specifications call for. |
| 3.2 | Inspection certificate 3.2 | As 3.1, but additionally validated by an independent third party — the purchaser's representative or a nominated inspection body. |
The practical gap is between 2.2 and 3.1. A 2.2 test report may show perfectly good numbers that were never measured on your material. If your specification says 3.1, a 2.2 will not satisfy an audit.
Siddhgiri Overseas supplies an EN 10204 Type 3.1 inspection certificate with stainless steel pipe and tube orders, recording the heat number, chemical analysis, mechanical test results and the specification supplied against.
A certificate is only useful if you can match it to the material in front of you. That link is the heat number, marked on the product and carried through the packing list and the certificate, so a length on site can be traced back to its cast.
Where a project requires particular marking, segregation of heats, or documentation beyond the standard package, tell us the requirement with your enquiry.
Yes — send the specification with your enquiry. We will confirm what we can supply against it, and say so plainly if we cannot, rather than quoting and sorting it out later.
Ask, and ask it of every supplier. A stockist reselling material issues documentation differently from a manufacturer producing it. We will tell you which applies to your order.
That is a Type 3.2 arrangement and must be agreed before production. Raise it at enquiry stage.
Send us the specification, certificate type and any inspection or marking requirements along with your material requirement, and we will confirm what we can supply before you place the order.
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