5120 steel coil is a low carbon, low alloy chromium, molybdenum, nickel case hardened alloy steel coil. It also is called GB 20Cr, DIN 20Cr4 and JIS SCr420 steel. It is formed into rolls by hot pressing and cold pressing, and has good wear resistance, weldability and toughness. It is widely used in the world. Good machinability under high temperature normalizing or quenching and tempering conditions.5120 steel composition and more information are as below.
ASTM 5120 Steel Coil Application