Alloy Steel Castings for Machinery, material 42CrMo4, quenched and tempered. 1. Material: Carbon Steel GS45, GS60,WCB, or Alloy Steel 25CrMo4,35CrMo4,42CrMo4, etc..2 ... after-sale service.8. Small QTY can also be acceptable. Steel Castings for Machinery