Short answer: An EN 10204 3.1 certificate is an inspection document in which the manufacturer declares compliance with the order and provides specific inspection results validated by an authorized representative independent of the manufacturing department. It does not replace the product standard or buyer traceability checks.
This guide is written for stainless steel buyers, sourcing teams, engineers and product manufacturers. The purpose is not to declare one universal winner, but to turn a broad material question into a specification that a mill or service center can quote, process and inspect consistently.
Quick Comparison
| Option | Key point | Typical use or decision |
|---|---|---|
| Material identity | Grade, heat number and product | Must match labels and order |
| Chemistry | Heat analysis values | Compare with grade limits |
| Mechanical results | Properties required by product standard | Check thickness and condition |
| Document authority | Manufacturer and validation | Review issuer and alterations |
The table is a starting point. Actual performance depends on the governing standard, delivered condition, dimensions, surface finish, fabrication route and service environment. Commercial names should never replace a complete purchase specification.
What Buyers Should Evaluate
- Name both EN 10204 3.1 and the applicable product standard.
- Keep heat-number traceability through slitting and cut-to-length.
- Reject edited or incomplete documents until clarified.
For production orders, share the end use rather than requesting a grade or finish in isolation. A supplier can then review corrosion exposure, forming severity, welding, visual requirements and packing before material is cut. This early review is usually less expensive than correcting a rejected shipment or unstable production trial.
Common Purchasing Mistakes
- Treating 3.1 as a steel grade
- Accepting a certificate whose heat number is absent from the goods
- Assuming every listed test applies to the delivered dimension
These mistakes are avoidable when drawings, approved samples, inspection methods and certificate requirements are agreed before production. For visual products, retain a signed master sample. For functional dimensions, define where and how measurements will be taken.
Recommended RFQ Wording
Purchase order wording should identify grade, product standard, inspection document EN 10204 3.1, required tests, traceability method and document language.
Also include order quantity, acceptable quantity variation, destination, required delivery date and whether partial shipments are allowed. If a requirement is critical, make it measurable and place it on the purchase order rather than only in an email conversation.
How Still Steel Supports the Project
Still Steel supplies stainless steel coil, strip and sheet and provides slitting, cut-to-length, brushing, polishing and protective-film services. We can compare available mill material with your drawing, prepare trial quantities and preserve heat-number traceability through service-center processing.
Send the grade, dimensions, annual volume and application to vip@still-steel.com, or discuss the requirement on WhatsApp.
Frequently Asked Questions
Does a 3.1 certificate prove the material in my warehouse?
Only when certificate data are tied to reliable physical heat-number traceability.
Is 3.2 better than 3.1?
3.2 involves additional independent validation and is used when the contract or critical service requires it.
Does EN 10204 define grade chemistry?
No. It defines inspection-document types; chemistry comes from the relevant material or product standard.
Technical References
Reference documents support general selection and fabrication principles. The final material decision must follow the applicable contract, standard, regulation and engineering review for the specific product.