Alloy structural steel This steel is produced according to GB/T3077, JIS, DIN, ASTM standards.The representative steel grades are 20Cr, 40Cr, 20CrMo, 35CrMo, 42CrMo,40CrMnMo ... , 40CrNiMo, 20CrMnTi, 20MnVB, SCM420, SCM440, SAE4140etc.Main application: The alloy structural steel is widely used in the manufacture of driving parts and ...