Compared with the physical property data of stainless steel and carbon steel, the density of carbon steel is slightly higher than that of ferrite and martensitic stainless steel, and slightly lower than that of austenitic stainless steel; the electrical resistivity increases according to the order of carbon steel, ferrite, martensite and austenitic stainless steel; the order of linear expansion coefficient is similar, austenitic stainless steel is the highest and carbon steel is the smallest; carbon steel, ferrite and martensite are the most The martensitic structure of austenitic stainless steel can be eliminated by heat treatment. Compared with carbon steel, austenitic stainless steel has the following characteristics:
1) The high negative rate is about 5 times of that of carbon steel.
2) With the increase of temperature, the value of linear expansion coefficient of stainless steel screw increases correspondingly.
3) Low thermal conductivity, about 1 / 3 of that of carbon steel.
