Q345B无缝钢管机械性能; 抗拉强度470-630MPa 屈服强度325MPa 伸长率21% Q345B 化学成份% : C ≤0.20, Mn 1.00-1.60,, Si ≤0.55, P ≤0.040, S ≤0.045, V 0.02-0.15 Nb 0.015-0.060, Ti 0.02-0.20 .
Q345B无缝钢管机械性能; 抗拉强度470-630MPa 屈服强度325MPa 伸长率21% Q345B 化学成份% : C ≤0.20, Mn 1.00-1.60,, Si ≤0.55, P ≤0.040, S ≤0.045, V 0.02-0.15 Nb 0.015-0.060, Ti 0.02-0.20 .