C1842,OC100 ,今日钢材价格 C72D2 C78D2 C80D2 C82D2 C86D2 C88D2 C92D2 C98D2C35E C45E 20Mn5 19MnB4 35B2 20CrMnVTiB4-10 25CrMo4 42CrMo4 42CrMo5-6 21CrMoV5-7 40CrMoV4-6 30CrNiMo8 34CrNiMo6 41NiCrMo7-3-2 X8Ni9 X1