420 stainless steel, a kind of "blade grade" martensite steel, has certain wear resistance, corrosion resistance and high hardness, and its surface color is formed by quenching and tempering treatment.

There are two kinds of heat treatment:

1, quenching and tempering: quenching+high temperature tempering to obtain good comprehensive properties;

2. Quenching treatment: oil quenching+low temperature tempering to obtain higher hardness.