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Physical Properties of stainless Steel (Ⅱ)
Jan 17, 2018

Physical Properties of stainless Steel (Ⅱ)

Carbon, high nitrogen, high manganese austenitic stainless steel, such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N series and high manganese austenitic stainless steel, under the condition of large reduction, the ε phase transition will occur, so the phase transition will remain nonmagnetic. At high temperatures above the Curie point, even strong magnetic materials will lose magnetism. However, some austenitic stainless steels such as 1Cr17Ni7, 0Cr18Ni9, the micro structure is metastable austenitic structure, martensite transformation occurs during large reduction cold processing or low temperature processing. It will have magnetism and the permeability will increase.

 

Modulus of Elasticity

The longitudinal elastic modulus of ferrite stainless steel at room temperature is 200kN / mm2. The longitudinal elastic modulus of austenitic stainless steel is 193 kN/mm2, slightly lower than carbon structural steel. With the increase of temperature, the longitudinal elastic modulus decreases, the Poisson's ratio increases, and the transverse elastic modulus (rigidity) decreases significantly. Longitudinal modulus of elasticity will have an effect on work hardening and micro-structure assembly.

 

Density

The density of ferrite stainless steel with high chromium content is small; the density of austenitic stainless steel with high nickel content and manganese content is high; the density of austenitic stainless steel becomes smaller at high temperature due to the increase of character spacing.

 

Physical properties at low temperature

1.  Thermal conductivity

The thermal conductivity of various stainless steels varies slightly at very low temperature, but generally is about 1/50 of thermal conductivity at room temperature. At low temperature, the thermal conductivity increases with the increase of magnetic flux (flux density).

2. Specific Heat

At very low temperatures, there are some differences in the specific heat capacity of various stainless steels. The specific heat capacity is greatly affected by temperature, and the specific heat capacity at 4k can be reduced to less than 1/100 of the specific heat capacity at room temperature.

3. Thermal Expansion

For austenitic stainless steel, the shrinkage of austenitic stainless steel is slightly different under 80k (compared to 273K), and the content of nickel has a certain effect on the shrinkage.

4. Resistivity

At very low temperature, the difference of resistivity between different grades is increased; the alloy elements have great influence on the resistivity.

5. Magnetism

For austenitic grade stainless steel, at low temperature, the effect of mass susceptibility on load magnetic field varies with different materials. The contents of different alloy elements are also different. There is no difference in permeability between different grades.

6. Elastic Modulus

At low temperature, the Poisson's ratio of austenitic stainless steel with magnetic transformation produces extreme value correspondingly.

 


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