The physical properties of stainless steel

Compared with carbon steel

1. Density
The density of carbon steel is slightly higher than that of ferritic and martensitic stainless steel, and slightly lower than that of austenitic stainless steel;

2. Resistivity
The resistivity is in increasing order of carbon steel, ferritic, martensitic and austenitic stainless steel;

3. The order of linear expansion coefficient is similar, austenitic stainless steel is the highest and carbon steel is the smallest;

4. Carbon steel, ferritic and martensitic stainless steels are magnetic, austenitic stainless steels are non-magnetic, but they will produce magnetism when they are cold-worked and hardened to form martensite transformation. Heat treatment can be used to eliminate this martensite. The tissue is restored to its non-magnetic properties.
Compared with carbon steel, austenitic stainless steel has the following characteristics:
①High resistivity, about 5 times that of carbon steel.
②Large linear expansion coefficient, 40% larger than carbon steel, and as the temperature rises, the value of the linear expansion coefficient increases accordingly.
③Low thermal conductivity, about 1/3 of carbon steel.

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