Alloy structural steel This steel is produced according to GB/T3077, JIS, DIN, ASTM standards.The representative steel grades are 20Cr, 40Cr, 20CrMo, ... , 20CrMnTi, 20MnVB, SCM420, SCM440, SAE4140etc.Main application: The alloy structural steel is widely used in the manufacture of driving parts and ... all kinds of cars, motorcycle,mechanical engineering, vessel, machine tool, chemical mechanism, etc.