Q345B钢板
Q345化学成分：
牌号 C Si Mn P S V Nb Al Ti
Q345A 0.20 ≤0.55 ≤1.70 ≤0.045 ≤0.045 0.02-0.15 0.015-0.060 - 0.02-0.20
Q345B ≤0.20  ≤0.55 ≤1.70  ≤0.040  0.040  0.02-0.15  0.015-0.060  - 0.02-0.20
Q345C ≤0.20  ≤0.55 ≤1.70 ≤0.035  ≤0.035 0.02-0.15 0.015-0.060 ≥0.015 0.02-0.20 
Q345D 0.18 ≤0.55 ≤1.80 ≤0.030 ≤0.030 0.02-0.15 0.015-0.060 ≥0.015  0.02-0.20
Q345E ≤0.18 ≤0.55 ≤1.80 ≤0.025 ≤0.025 0.02-0.15 0.015-0.060 ≥0.015  0.02-0.20
上海至联Q345B规格：φ8-φ320，质优价廉。