4130 Tubing with MTC 3.1
An EN 10204 3.1 certificate ties a batch of 4130 tubing to its heat of steel. That link is easy to keep while tube is in its original bundle and easy to lose once it is cut, racked and mixed with other stock.
What EN 10204 3.1 MTC Documents
An EN 10204 3.1 MTC for 4130 tubing typically records:
- Material grade (AISI 4130 or EN 25CrMo4 / 1.7218)
- Applicable specification (ASTM A519, AMS-T-6736, or EN 10297)
- Product form (seamless, CDS, or HFS)
- Dimensions (OD, wall, length)
- Heat/cast number (the manufacturing batch identifier)
- Ladle analysis (actual chemical composition of the heat)
- Mechanical test results (if required by specification or buyer)
- Condition/heat treatment (if applicable)
- Signatory: the manufacturer's authorised inspection representative
The document is not signed by an independent third party under 3.1 — that is a 3.2 requirement.
How to Use MTC 3.1 in Procurement
On receipt of 4130 tubing, the buyer's receiving inspection should:
1. Confirm the MTC accompanies the delivery
2. Check the grade on the MTC matches the order
3. Verify the heat number appears on both the MTC and the tube bundle (end marking or tag)
4. Review the ladle analysis — compare with the applicable specification composition limits
5. Check the condition / heat treatment if specified
6. File the MTC with the delivery documentation
| MTC Element | What to Check |
|---|---|
| Material grade | Must state AISI 4130 or equivalent designation |
| Specification reference | Must state applicable standard (ASTM A519, AMS-T-6736, etc.) |
| Heat/cast number | Must match marking on tube bundle or end tag |
| Ladle analysis | Compare each element against specification composition limits |
| Product form | Must state seamless (CDS or HFS) |
| Dimensions | Must match order dimensions |
| Condition | Must match specified condition (Normalized, As-drawn, etc.) |
| Signatory | 3.1: manufacturer's authorised representative |
Keeping Traceability After Delivery
The heat number is the thread that connects tube to certificate. To keep it intact:
- Record the heat number of each size when the delivery is checked in.
- Store each heat separately, or mark the rack with its heat number.
- When you cut a length, transfer the heat number to the remaining piece and to the off-cut.
- Write the heat number on the job card or build record for every part made.
- File the certificate where it can be found by heat number.
If you resell tube, pass on a copy of the mill certificate with the heat number that matches the material supplied.
Suitable purchase order wording is: "Material to be supplied with inspection certificate EN 10204 type 3.1 showing heat number, chemical analysis and delivery condition; heat number to be marked on each length or bundle." Add mechanical test results to that wording if you need them. Problems to watch for are listed under mill test certificates.
Frequently Asked Questions
Is MTC 3.1 the same as a Certificate of Conformance?
No. An MTC (Mill Test Certificate) documents actual test results — ladle analysis and, where required, mechanical test data. A Certificate of Conformance is a supplier declaration that the material meets specification. Both may be required by some quality plans. They serve different purposes.
What is the difference between MTC 3.1 and MTC 3.2?
Under EN 10204: 3.1 is certified by the manufacturer's authorised inspection representative (internal certification). 3.2 is certified by both the manufacturer and an independent inspection body or buyer's representative (external witness). 3.2 provides an additional layer of independent verification and is required by some aerospace and pressure vessel programmes.
How do I keep traceability when I cut tube?
Transfer the heat number to every piece and record it against the job.
Source 4130 Tubing with MTC 3.1
All 4130 tubing orders can be supplied with EN 10204 3.1 MTC. Provide your specification, OD, wall, and documentation requirement.
- Grade: 4130
- Standard (ASTM A519 or AMS)
- OD & Wall
- Condition
- EN 10204 3.1 MTC required
- Delivery