③ 标准/对比页
Q355B vs S355JR: What Buyers Should Know
Q355B and S355JR look similar on paper - both nominal 355 MPa minimum yield. Here is how they actually differ, and when one can replace the other.
Two StandardsQ355B follows GB/T 1591 (China); S355JR follows EN 10025-2 (Europe). Both target 355 MPa minimum yield.
When to SubstituteCheck impact test temperature: S355JR requires +20 C Charpy; Q355B impact requirement depends on the quality suffix (B = +20 C). For most structural welding they are interchangeable with written approval.
Practical AdviceMatch by application and welding procedure, not by name alone - and confirm with mill certificates.
| Item | Q355B | S355JR |
|---|---|---|
| Standard | GB/T 1591 | EN 10025-2 |
| Yield | >=355 MPa | >=355 MPa |
| Impact | by grade suffix | +20 C |
| Region | China | Europe |