Q355
China's S355 counterpart, which replaced Q345 in GB/T 1591-2018. Q355B/C/D test 34 J at +20/0/−20 °C.
Q355B34 J at +20 °CQ355C34 J at 0 °CQ355D34 J at −20 °C
Compared with S355 on its equivalents table.
No values beyond 16 mm for Q355 in this data.
All values
Strength
Yield strength ReH
Upper yield strength guaranteed by the product standard (minimum).
| Condition | Value | Evidence |
|---|---|---|
| ≥ 355MPa | From the standard |
Tensile strength Rm
Ultimate tensile strength. Product standards give a range or a minimum.
| Condition | Value | Evidence |
|---|---|---|
| 470–630MPa | Corroborated1 |
Ductility
Elongation after fracture A
Minimum elongation; depends on gauge length and test direction.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 21% | Confirmed1 |
Toughness
Impact energy (Charpy V) KV
Minimum absorbed energy at the stated test temperature.
| Condition | Value | Evidence |
|---|---|---|
| ≥ 34J | Confirmed |
Listed as equivalent to
- S355 (EN 10025-2:2019) — China's direct counterpart since GB/T 1591-2018 renamed Q345 to Q355. Q355B/C/D test 34 J where S355JR/J0/J2 test 27 J; thickness bands and chemistry differ.
Not yet verified for this grade
- Yield and tensile by thickness band (GB/T 1591-2018 tables)
Missing on purpose: a value appears here only once a public source states it.
Sources here are public pages that reproduce GB/T 1591-2018. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence.