The following is a physical introduction to precision stainless steel strips, mainly from five aspects:
(1) Specific heat capacity
The specific heat capacity will change with the change of temperature, but once the phase transition or precipitation occurs in the metal structure during the temperature change, the specific heat capacity will change significantly. hot bimetal
(2) Thermal conductivity
Below 600℃, the thermal conductivity of various precision stainless steel strips is basically 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, 2 Cr 25N, 0 Cr 18Ni11Ti, 0 Cr 18 Ni 9, 0 Cr 17 Ni 12Mο2, 2 Cr 25Ni20. The thermal conductivity increases from large to 500 ℃ The order of smallest 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 at 100 °C is about 1/4.
(3) Linear expansion coefficient
In the range of 100-900°C, the linear expansion coefficients of various stainless steel grades are basically 10ˉ6~130*10ˉ6°Cˉ1, and show an increasing trend with the increase of temperature. For precipitation hardening stainless steel, the size of 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 precision stainless steel belts is basically 70*10ˉ6~130*10ˉ6Ω·m, and it tends to increase with the increase of temperature. When used as a heating material, materials with low resistivity should be selected.
(5) Magnetic permeability
The magnetic permeability of precision stainless steel belt is extremely small, so it is also called non-magnetic material. Steels with stable structures, 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%.