High degree of quenching, no temper brittleness, welding is quite good, the formation of cold cracking tendency is small, cutting and cold strain plasticity is good. Generally used in the hardening or carburizing and quenching state, used in the manufacture of in non corrosive medium and the temperature lower than 250 DEG C containing mixture of nitrogen and hydrogen medium high pressure tubes and a variety of fastening pieces, more advanced carburized parts, such as gears, axle and so on.