Alloy structural steel This steel is produced according to GB/T3077, ... ,40CrMnMo, 40CrNiMo, 20CrMnTi, 20MnVB, SCM420, SCM440, SAE4140etc.Main application: The alloy structural steel is widely used in the manufacture of driving ... and connecting parts including shaft, half shaft, cam shaft, spindle, standard parts of all kinds of cars, motorcycle,mechanical engineering, vessel ...