... , gear, reducer machinery, hydraulic machinery and wind generating set etc. (1). Among the free forgings carbon steel forgings are generally the ... customers' different requirements. (7). Main material are CK45, AISI 4140&4130, 5CrMnMo, 40Cr, 42CrMo, 20Cr2Ni4, 5CrNiMo, 15CrNiMo, 20CrNiMo, 35CrMo, 40CrNiMo, etc ...