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Physical Properties of Stainless Steel
Jan 17, 2018

Physical Properties of Stainless Steel

1. General Physical Properties

Like other materials, the physical properties mainly include the following three aspects: melting point, specific heat capacity, thermal conductivity and linear expansion coefficient, electrical resistivity, conductivity, permeability and other electromagnetic properties. As well as Young's modulus of elasticity, stiffness coefficient and other mechanical properties. These properties are generally considered to be the inherent properties of stainless steel, but also affected by such as temperature, processing degree and magnetic field strength. Generally, stainless steel has lower thermal conductivity and greater resistance than pure iron. The linear expansion coefficient and magnetic conductivity vary according to the crystalline structure of stainless steel itself.

 

2. The Correlation between Physical Properties and Temperature

(1) Specific Heat Capacity

The specific heat capacity will change with the temperature. But the specific heat capacity will change significantly once phase transition or precipitation occurs in the metal structure during the process of temperature change.

(2) Thermal Conductivity

Under 600 ℃, the thermal conductivity of various stainless steels is in the range of 10 ~ 30W / (m ·℃), and the thermal conductivity tends to increase with the increase of temperature. At 100 ℃, the order of thermal conductivity of stainless steel from large to small is 1Cr17, 00Cr12, 2Cr25N, 0Cr18Ni11Ti, 0Cr18Ni9, 0Cr17Ni12MO2, 2Cr25Ni20. The order of thermal conductivity from large to small at 500℃ is 1Cr13, 1Cr17, 2Cr25N, 0Cr17Ni12Mo2, 0Cr18Ni9Ti and 2Cr25Ni20. The thermal conductivity of austenitic stainless steel is slightly lower than that of other stainless steels, compared with ordinary carbon steel, the thermal conductivity of austenitic stainless steel at 100 ℃ is about 1 / 4.

(3) Coefficient of linear expansion

In the range of 100-900 ℃, the linear expansion coefficient of all kinds of stainless steel grades is basically 10-6~130*10-6℃-1. As the temperature rises, it tends to increase. For precipitation-hardening stainless steel, the aging temperature of linear expansion coefficient is determined. For precipitated hardened stainless steel, the linear expansion coefficient is determined by aging temperature.

(4) Resistivity

At 0 ~ 900 ℃, the specific resistance of the main grades of various stainless steels is about 70*10ˉ6~130*10ˉ6Ω·m. The resistivity increases with the increase of temperature.

(5) Permeability

The permeability of austenitic stainless steel is minimal, so it is also called non-magnetic material. Steel with stable austenitic structure, such as 0Cr20Ni10, 0Cr25Ni20 and so on, will not be magnetic even if it is processed with a large amount of deformation greater than 80%.

 


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