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Stainless steel belt physical properties and temperature correlation

Stainless steel belt physical properties and temperature correlation

Time:2022-04-02 Source:Wuxi Jianuo Special Steel Co., Ltd.

Correlation between physical properties and temperature

(1) specific heat capacity

With the change of temperature specific heat capacity will change, but in the process of temperature change in the metal tissue once the phase change or precipitation, then the specific heat capacity will change significantly.

(2) Thermal conductivity

Below 600 ℃, the thermal conductivity of various stainless steel is basically in the range of 10 to 30 W / (m – ℃), with the increase in temperature thermal conductivity has a tendency to increase. At 100 ℃, the order of thermal conductivity of stainless steel from large to small 1Cr17, 00Cr12, 2 Cr 25N, 0 Cr 18Ni11Ti, 0 Cr 18 Ni 9, 0 Cr 17 Ni 12Mο2, 2 Cr 25Ni20. 500 ℃ thermal conductivity from large to small order 1 Cr 13, 1 Cr 17, 2 Cr 25N, 0 Cr 17Ni12Mο2, 0 Cr 18Ni9Ti and 2 Cr 25Ni20. austenitic stainless steel thermal conductivity is slightly lower than other stainless steels, compared with ordinary carbon steel, austenitic stainless steel thermal conductivity at 100 ℃ is about 1/4 of its.

(3) Linear expansion coefficient

In the range of 100-900 ℃, all kinds of stainless steel main grades of the coefficient of linear expansion of the basic 10 ˉ 6 ~ 130 * 10 ˉ 6 ℃ ˉ 1, and with the increase in temperature is an increasing trend. For precipitation hardening stainless steel, the size of the coefficient of linear expansion aging treatment temperature to determine.

(4) resistivity

In 0 ~ 900 ℃, the main grades of various types of stainless steel specific resistance of the size of the basic in 70 * 10 ˉ 6 ~ 130 * 10 ˉ 6 Ω – m, and with the increase in temperature has a tendency to increase. When used as a heating material, low resistivity materials should be selected.

(5) Magnetic permeability

Austenitic stainless steel magnetic permeability is very small, so also known as non-magnetic materials. Steel with stable austenitic organization, such as 0 Cr 20 Ni 10, 0 Cr 25 Ni 20, etc., even if the processing of its large deformation of greater than 80% will not be magnetic. In addition, high carbon, high nitrogen, high manganese austenitic stainless steel, such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N series and high manganese austenitic stainless steel, etc., in the large pressure under the amount of processing conditions will occur ε phase phase transformation, so remain non-magnetic. In the Curie point above the high temperature, even the strong magnetic material will lose magnetism. However, some austenitic stainless steel such as 1Cr17Ni7, 0Cr18Ni9, because its organization is sub-stable austenite organization, and thus in the large amount of cold processing under pressure or low-temperature processing will occur martensite phase change, itself will have magnetic and magnetic permeability will also increase.

(6) modulus of elasticity

The longitudinal elastic modulus of ferritic stainless steel at room temperature is 200 kN/mm2, and the longitudinal elastic modulus of austenitic stainless steel is 193 kN/mm2, which is slightly lower than that of carbon structural steel. As the temperature increases the longitudinal modulus of elasticity decreases, the Poisson’s ratio increases, and the transverse modulus of elasticity (stiffness) decreases significantly. The longitudinal modulus of elasticity will have an effect on work hardening and tissue assembly.

(7) Density

High chromium content of ferritic stainless steel density is small, high nickel content and high manganese content of austenitic stainless steel density is large, at high temperatures due to the increase in density of the Pinnacle spacing becomes smaller.