牌号 |
品质 等级 |
化学成分(%) | ||||
C |
Mn |
Si |
P |
S | ||
Q345B |
B |
≤0.20 |
1.00-1.70 |
≤0.55 |
≤0.040 |
≤0.040 |
牌号 |
品质 等级 |
屈服点(MPa) |
抗拉强度 (MPa) |
伸长率 (%) |
弯曲试验 | ||
≤16mm |
>16-35mm |
≤16mm |
> | ||||
Q345B |
B |
≥345 |
≥325 |
470-630 |
≥21 |
d=2a |
d=3a |