Physical properties of stainless iron

Comparing the physical properties of stainless iron and carbon iron, the density of carbon iron is slightly higher than that of ferrite and martensitic stainless steel, and slightly lower than that of austenitic stainless steel; the resistivity is carbon iron and ferrite. The order of size, martensite and austenitic stainless iron is increasing; the order of linear expansion coefficient is similar, the austenitic stainless steel is the highest and the carbon iron is the smallest; the carbon iron, ferrite and martensite stainless Iron is magnetic, austenitic stainless steel is non-magnetic, but its cold work hardening will produce magnetism when it is transformed into a solid body. Heat treatment can be used to eliminate this martensite structure and restore its non-magnetic properties.

Austenitic stainless steel has the following characteristics compared with carbon iron:

1) High resistivity, about 5 times that of carbon iron.

2) The large coefficient of linear expansion is 40% larger than that of carbon iron, and as the temperature increases, the value of the coefficient of linear expansion increases accordingly.

3) Low thermal conductivity, about 1/3 of carbon iron.

Mechanical properties of stainless iron

Regardless of stainless iron plates or heat-resistant iron plates, austenitic iron plates have the best overall performance, both with sufficient strength and excellent plasticity, while their hardness is not high, which is why they are widely used. one. Austenitic stainless steel is similar to most other metallic materials, and its tensile strength, yield strength and hardness increase with decreasing temperature; plasticity decreases with decreasing temperature. Its tensile strength is relatively uniform in the temperature range of 15~80 °C. More importantly: as the temperature decreases, the impact toughness decreases slowly and there is no brittle transition temperature. Therefore, stainless iron can maintain sufficient plasticity and toughness at low temperatures.

Heat resistance of stainless steel

Heat resistance refers to the performance of oxidation resistance or resistance to gas medium corrosion, that is, thermal stability, and sufficient strength, that is, heat strength at high temperatures.

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