Steel structure manufacturer since 2009 · 8 fabrication bases in China
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EN 10204 defines the types of inspection document that come with metallic products. For structural steel, 3.1 is the usual requirement.
| Type | Content | Validated by |
|---|---|---|
| 2.1 | Declaration of compliance, no test results | Manufacturer |
| 2.2 | Non-specific test results | Manufacturer |
| 3.1 | Specific test results for the delivered batch | Manufacturer’s independent inspector |
| 3.2 | 3.1 plus purchaser’s or third-party inspector | Both parties |
The heat number on the certificate should be transferred to each cut piece and recorded against member marks, so any member can be traced back to its certificate.
Ask for the trace log, not just the certificates. Certificates without a link to members prove little.
Send drawings or a brief. An engineer replies within 1 working day.
EN 1090-1 and EN 1090-2 for steel structures: execution classes EXC1–EXC4, factory production control, CE marking and supplier checks.
ISO 3834 parts 2, 3 and 4 for welding quality management, how they relate to EN 1090, and what to ask a fabricator.
Q235B, Q355B, Q390 and Q420 compared with ASTM A36, A572 and A992, EN S235 to S420 and AS/NZS grades: yield strength, impact tests and when substitution needs approval.