20CrMnTiH圆钢20CrMnTiH材质
35CrMo钢厂35CrMo圆棒
40Cr圆棒_40Cr圆钢
20CrMnTiH圆钢20C..
20CrNiMo_20CrN..
Alform900
德国/舞钢S690QL