Comparing the physical properties of stainless steel and carbon steel, the density of carbon steel is slightly higher than that of ferritic and martensitic stainless steel, but slightly lower than that of austenitic stainless steel; The order of martensitic and austenitic stainless steels is increasing; the order of linear expansion coefficient is similar, austenitic stainless steel is the highest and carbon steel is the smallest; carbon steel, ferritic and martensitic stainless steel are magnetic, austenitic stainless steel Stainless steel is non-magnetic, but it will be magnetic when cold work hardening generates martensitic transformation.
Heat treatment can be used to eliminate this martensite structure and restore its non-magnetic properties. Compared with carbon steel, austenitic stainless steel has the following characteristics:
1) High resistivity, which is about 5 times that of carbon steel.
2) Large linear expansion coefficient, which is 40% larger than carbon steel, and with the increase of temperature, the value of linear expansion coefficient also increases accordingly.
3) Low thermal conductivity, about 1/3 of carbon steel.
