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Correlation between physical properties and temperature of stainless steel coil?

2023-02-24
Stainless steel coil is mainly a narrow and long steel plate produced to meet the needs of industrial production of various metal or mechanical products in different industrial sectors.

(1) Specific heat capacity

As the temperature changes, the specific heat capacity will change, but once the phase transition or precipitation occurs in the metal structure during the temperature change, the specific heat capacity will change significantly.
Stainless Steel Coil
(2) Thermal conductivity

Below 600°C, the thermal conductivity of various stainless steels is basically in the range of 10~30W/(m·°C), and the thermal conductivity tends to increase with the increase of temperature. At 100°C, the order of thermal conductivity of stainless steel from large to small is 1Cr17, 00Cr12, 2 Cr 25N, 0 Cr 18Ni11Ti, 0 Cr 18 Ni 9, 0 Cr 17 Ni 12Mο2, 2 Cr 25Ni20. At 500°C, the thermal conductivity increases from large to The smallest order is 1 Cr 13, 1 Cr 17, 2 Cr 25N, 0 Cr 17Ni12Mο2, 0 Cr 18Ni9Ti and 2 Cr 25Ni20. 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 is about 1/4 at 100 °C.

(3) Linear expansion coefficient

In the range of 100-900°C, the linear expansion coefficients of the main grades of various stainless steels are basically 10ˉ6~130*10ˉ6°Cˉ1, and tend to increase with the increase of temperature. For precipitation hardening stainless steel, the linear expansion coefficient is determined by the aging treatment temperature.

(4) Resistivity

At 0~900℃, the specific resistance of the main grades of various stainless steels is basically 70*10ˉ6~130*10ˉ6Ω·m, and it tends to increase with the increase of temperature. When used as a heating material, a material with low resistivity should be selected.

(5) Magnetic permeability

Austenitic stainless steel has extremely low magnetic permeability, so it is also called non-magnetic material. Steels with a stable austenitic structure, such as 0 Cr 20 Ni 10, 0 Cr 25 Ni 20, etc., will not be magnetic even if they are processed with a large deformation of more than 80%. In addition, high-carbon, high-nitrogen, high-manganese austenitic stainless steels, such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N series, and high-manganese austenitic stainless steels, will undergo ε phase transformation under large reduction processing conditions, so they remain non-magnetic.

At high temperatures above the Curie point, even strong magnetic materials lose their magnetism. However, some austenitic stainless steels such as 1Cr17Ni7 and 0Cr18Ni9, because of their metastable austenite structure, will undergo martensitic transformation during large-reduction cold working or low-temperature processing, and will be magnetic and magnetic. Conductivity will also increase.

(6) Modulus of elasticity

At room temperature, the longitudinal elastic modulus of ferritic stainless steel is 200kN/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 elastic modulus decreases, Poisson's ratio increases, and the transverse elastic modulus (rigidity) decreases significantly. The longitudinal elastic modulus will have an effect on work hardening and tissue aggregation.

(7) Density

Ferritic stainless steel with high chromium content has low density, austenitic stainless steel with high nickel content and high manganese content has high density, and the density becomes smaller due to the increase of lattice spacing at high temperature.

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