| Type | Name | What it shows |
|---|---|---|
| 2.1 | Declaration of compliance | The mill states the product meets the order. No test results. |
| 2.2 | Test report | Test results, but not necessarily from your batch. |
| 3.1 | Inspection certificate | Test results from your batch, signed by the mill’s own authorised inspector. This is the usual “MTC”. |
| 3.2 | Inspection certificate | Like 3.1, and also signed by an independent inspector or the buyer’s representative. |
The 2004 edition cut the list down to these four. 3.1 replaced the old 3.1B, and 3.2 replaced 3.1A, 3.1C and the old 3.2.
It gives chemistry and mechanical properties for the batch. PMI, ultrasonic testing, corrosion tests and third-party inspection are all separate. If you need them, list them.
A certificate is tied to a heat number, not to a finished part. If you need each finished piece traced back to its heat, we plan the marking from the cutting stage. It’s hard to do once everything is welded.
Send us your project’s document list and we’ll tell you what we can supply.
Answer a few questions and you get a list of what to attach, plus a summary you can send us straight away.
Both show test results for your batch. A 3.1 is signed by the mill's own inspector. A 3.2 adds a signature from an independent inspector or the buyer.
No. A declaration of compliance (2.1) has no test results. An MTC normally means a 3.1.
Your specification decides. Some jobs need none, many need 3.1, a few need 3.2. Send the spec and we'll check.
Check the numbers against the current edition of each standard and your project spec.