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What are the differences between the physical, mechanical properties and heat resistance of stainles
The density of carbon steel is slightly higher than that of ferrite and martensite, and slightly lower than that of austenite. The resistivity of carbon steel, ferrite, martensite and austenite increases in the order: the size of the linear expansion coefficient is similar, with austenite being the highest and carbon steel being the lowest; carbon steel, ferrite and martensite are magnetic, while austenite is non-magnetic; cold processing gives it magnetism, which can be eliminated by heat treatment.
Compared with carbon steel, austenitic stainless steel has the following characteristics:
1) Its resistivity is high, approximately 5 times that of carbon steel.
2) Its linear expansion coefficient is large, 40% greater than that of carbon steel, and as the temperature rises, the value of the linear expansion coefficient also increases accordingly.
3) Its thermal conductivity is low, approximately 1/3 that of carbon steel.
The mechanical properties of stainless steel
Whether it is stainless steel plates or heat-resistant steel plates, the austenitic type of steel plates have the best comprehensive performance. They have sufficient strength, excellent plasticity, and a relatively low hardness. This is one of the reasons why they are widely used. Similar to most other metal materials, the tensile strength, yield strength, and hardness of austenitic stainless steel increase as the temperature decreases; while the plasticity decreases as the temperature drops. The tensile strength of austenitic stainless steel increases uniformly within the temperature range of 15 - 80°C. More importantly: as the temperature decreases, its impact toughness decreases slowly, and there is no brittle transition temperature. Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperatures.
The heat resistance of stainless steel
Heat resistance refers to the property of resisting oxidation or corrosion by gas media at high temperatures, which is known as thermal stability. At the same time, it also has sufficient strength at high temperatures, which is called thermal hardness.
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