S690QL, S890QL and High-Strength Steel Fabrication
Quenched and tempered steel gets its strength from heat treatment, and welding is a heat treatment you did not plan.
Grades we work with
| GB | EN | ASTM | We process |
|---|---|---|---|
| Q690 | S690QL / S690QL1 | comparable to A514 | cut to 60 mm |
| Q890 | S890QL | — | cut to 60 mm |
| Q960 | S960QL | — | cut to 60 mm |
Why these grades are quoted differently
Get the heat input wrong and you have S355 in the heat-affected zone with S690 on the drawing. So these jobs carry mandatory preheat, controlled interpass temperature, and consumables matched to the grade — and that is why the price per kilo is not the same as carbon steel.
If your drawing specifies S690QL where S355 would do the job, tell us. Sometimes it is the right call and sometimes it is inherited from an old drawing.
Certificates and classification
EN 10204 2.2, 3.1 as standard, 3.2 on request. Parts in this family usually classify under CN 7308 / 7326 — see what we can document for CBAM.
Materials and fabrication are supplied according to your drawings and specified standards. Grade equivalency is subject to chemical composition, mechanical properties, impact requirements, heat-treatment condition, thickness range and project-specific approvals. We do not claim any grade to be fully identical to another on the basis of designation alone.
Send us the drawing
Acknowledgement within 4 working hours. Full quotation within 48 hours when the drawing package is complete.