Stainless Steel Pipe Fittings

Physical properties, mechanical properties and heat resistance of stainless steel

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Physical properties of stainless steel

Comparison of physical property data of stainless steel and carbon steel, carbon steel, the density is slightly higher than that of ferritic and martensitic stainless steel, and slightly lower than the austenitic stainless steel; resistivity by carbon steel, Ferritic, martensitic and austenitic stainless steel sort increment; linear expansion coefficient of size sorting is similar, austenitic stainless steel and carbon steel minimum; carbon steel, Ferritic and martensitic stainless steel magnetic, austenitic stainless steel is not magnetic, but the cold hardening generated into martensite transformation will produce magnetic heat treatment, available method to eliminate this martensite and restore its non-magnetic.

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

1) the high rate of electric negative is about 5 times of that of carbon steel.

2) the coefficient of linear expansion is 40% larger than that of carbon steel, and the coefficient of linear expansion increases correspondingly as the temperature increases.

3) low thermal conductivity, about 1/3 of carbon steel.

Mechanical properties of stainless steel

Austenitic stainless steels are similar to most other metal materials, and their tensile strength, yield strength and hardness increase with decreasing temperature, while plasticity decreases with decreasing temperature. Its tensile strength increases at a temperature range of 15~80 degrees C, which is even. More importantly, as the temperature decreases, the impact toughness decreases slowly, and there is no brittle transition temperature. Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperatures.

Heat resistance of stainless steel

Heat resistance refers to the high temperature, both antioxidant or gas medium corrosion resistance, namely thermal stability, while in high temperature double enough strength, namely heat intensity.

Source: China Steel Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

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