(1) Specific heat capacity: with the change of temperature, the specific heat capacity will change. However, once phase transformation or precipitation occurs in the metal structure during the process of temperature change, the specific heat capacity will change significantly.

(2) Thermal conductivity: below 600 ℃, the thermal conductivity of various stainless steels is basically within the range of 10~30w/ (m ·℃). With the progress of temperature, the thermal conductivity tends to increase. At 100 ℃, the thermal conductivity of stainless steel is in the order of 1Cr17, 00Cr12, 2Cr25N, 0cr18ni11ti, 0Cr18Ni9 and 0cr17ni12m ο 2、2Cr25Ni20。 The order of thermal conductivity at 500 ℃ is 1Cr13, 1Cr17, 2Cr25N, 0cr17ni12m ο 2. 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 is about 1/4 at 100 ℃.

(3) Linear expansion coefficient: in the scale of 100-900 ℃, the linear expansion coefficient of various important stainless steel brands is basically 10 ˉ 6~130*10 ˉ 6℃ ˉ 1, and showed an increasing trend with the increase of temperature. For precipitation hardening stainless steel, the size of linear expansion coefficient depends on aging treatment temperature.

(4) Resistivity: at 0~900 ℃, the specific resistance of various important stainless steel brands is basically 70*10 ˉ 6~130*10 ˉ 6 Ω· m, and has an increasing trend with the increase of temperature. When used as heating material, the material with low resistivity shall be selected.

(5) Permeability: austenitic stainless steel has very low permeability, so it is also called non-magnetic material. Steels with stable austenite structure, such as 0cr20ni10 and 0Cr25Ni20, will not be magnetic even if they are processed with large deformation greater than 80%. Physical properties of stainless steel

(6) Elastic modulus: at room temperature, the longitudinal elastic modulus of ferritic stainless steel is 200kn/mm2, and that of austenitic stainless steel is 193kn/mm2, slightly lower than that of 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. The longitudinal elastic modulus will affect the work hardening and microstructure aggregation.

(7) Density: ferritic stainless steel with high chromium content has low density, while austenitic stainless steel with high nickel content and high manganese content has high density. Under high temperature, the density becomes smaller due to the increase of moral spacing.