Standard: GB / T 3077-1999
Main Features
The carbon steel is quenched and tempered steel, strength, wear resistance and hardenability were relatively high, the critical quenching in oil diameter 10 ~ 25mm, the critical quenching diameter in water of 22 ~ 45. After quenched with good mechanical properties, machinability is still good; but when overheating heat sensitivity and tendency to temper brittleness, water quenching easy to crack, white spot sensitive, and cold welding of plastic deformation and low defects.