EN 10204 defines inspection document types for metallic products. Type 3.1 is widely used because it gives the buyer a manufacturer-issued declaration of compliance with test results from specific inspection, signed by an authorized inspection representative independent of production.
Inspection and documentation / quality / 7 min
EN 10204 3.1 Inspection Certificate Guide for Alloy Components
EN 10204 3.1 is one of the most requested documentation terms in international alloy procurement. RTI treats it as a release-control requirement that links the supplied component to the manufacturer's inspection certificate, specific test results, heat number, material standard, marking, and buyer document review before dispatch.
Engineering explanation
Written as a specification aid, not a generic article.
The guide keeps standards, material selection, inspection, and commercial release in separate lanes so buyers can issue a cleaner technical RFQ.
For RTI alloy components, a 3.1 request should not be treated as a generic certificate label. The procurement team should verify heat number, grade, UNS, product standard, chemistry, mechanical values, heat treatment, PMI report where ordered, marking, and dimensional records where applicable.
Technical diagram
3.1 certificate review flow
Step 01
Order
State EN 10204 3.1 in the purchase requirement.
Step 02
Heat
Match heat number to material and finished component marking.
Step 03
Tests
Review chemistry, mechanical results, and ordered supplementary tests.
Step 04
Identity
Check UNS, standard, size, class, and quantity.
Step 05
Release
Approve certificate package before dispatch.
Specification table
Structured control points for engineering and procurement.
The table is intentionally compact: it summarizes the decision points RTI needs before a commercial offer becomes technically meaningful.
| Engineering point | Controlled guidance | Procurement implication |
|---|---|---|
| 3.1 definition | Manufacturer inspection certificate with compliance statement and specific test results. | Request it explicitly in RFQ and purchase order. |
| Signature control | Signed by an authorized inspection representative independent of manufacturing. | Check certificate issuer and inspection authority before release. |
| 3.2 distinction | 3.2 involves independent inspection or agreed external validation. | Use 3.2 only where the project specification calls for it. |
| MTC content | Chemistry, mechanical properties, heat number, standard, grade, and product identity should be traceable. | Reject vague certificates that cannot be tied to the supplied item. |
| RTI dossier | 3.1 can sit with PMI, TPI release, dimensional records, NDE, packing list, and origin documents. | Build a complete document pack for international projects. |
Application examples
Where this guide changes the buying conversation.
Examples show quotation contexts, not universal approvals. The project specification remains the governing document.
Buyer and procurement implications
The commercial consequences of the engineering detail.
Each point is written for quotation discipline: what to state, what to avoid, and what to hold for engineering or inspection review.
State certificate type early
3.1 or 3.2 requirements should be in the RFQ, not introduced at dispatch.
Match documents to goods
The certificate must connect heat number, marking, size, standard, and quantity to the actual shipment.
Do not confuse PMI with MTC
PMI supports grade verification; it does not replace the mill or manufacturer certificate.
Hold dispatch until reviewed
For critical packages, buyer or TPI document approval should happen before packing release.
Engineering FAQs
Practical questions on EN 10204 3.1 Guide.
Answers are intentionally tied to standards, documents, and RFQ data rather than loose sales copy.
Related materials
Continue the material-selection path.
Related links are deliberately narrow so the knowledge centre supports engineering choices instead of spraying pages.
Related products
Move from knowledge to line-item definition.
Product links connect the technical guide to controlled commercial pages and the RFQ intake.
Contextual RFQ
Need certificates checked before shipment?
Add EN 10204 3.1, PMI, TPI, dimensional records, marking photos, and packing documents to your RFQ package.
