中板Q345C转炉操作要点(试行) 一化学成份C()Si()Mn()P()S()AlsNb()Ti()V() 国标≤0.20≤0.551.00-1.60≤0.035≤0.035≥0.0150.015-0.0600.02-0.060.02-0.15内控0.12-0.160.20-0.501.20-1.50≤0.020≤0.020≥0.0150