The physical properties of aisi 310 stainless steel coil strips are closely related to temperature. What are the specific correlations between the two? The following is an analysis.
The correlation between physical properties and temperature is as follows:
(1) Specific heat capacity
According to the research, it is found that the specific heat capacity of the steel strip is affected by the temperature. Once the temperature changes, the specific heat capacity will also change. However, during the temperature change process, once the metal structure in the steel strip undergoes phase transformation or precipitation, the specific heat capacity will occur. obvious changes.
(2) Thermal conductivity
When the heating temperature is below 600℃, the thermal conductivity of the steel strip is basically maintained in the range of 10~30W/(m·℃), but as the heating temperature increases, the thermal conductivity of the steel strip will also increase. When the temperature is 100℃, the thermal conductivity of the steel strip will also change continuously, the thermal conductivity is from large to small, the specific order is 1Cr17, 00Cr12, 2 Cr 25N, 0 Cr 18Ni11Ti, 0 Cr 18 Ni 9, 0 Cr 17 Ni 12Mο2, 2 Cr 25Ni20.
When the heating temperature is 500 ℃, the thermal conductivity of the steel strip is from large to small, and its specific order is 1 Cr 13, 1 Cr 17, 2 Cr 25N, 0 Cr 17Ni12Mο2, 0 Cr 18Ni9Ti and 2 Cr 25Ni20.
Among them, the thermal conductivity of austenitic steel strips is lower than that of other steel strips. When the temperature is 100 °C, the thermal conductivity of austenitic steel strips is only about 1/4 of that.
(3) Linear expansion coefficient
When the heating temperature is in the range of 100-900℃, the linear expansion coefficient of the steel strip is basically in the numerical range of 10ˉ6~130*10ˉ6℃ˉ1, and the linear expansion coefficient also increases continuously with the increase of temperature. As for the precipitation hardening steel strip, the size and aging of its linear expansion coefficient need to be determined by temperature.
(4) Resistivity
When the temperature is in the range of 0~900℃, the resistance of the steel strip is generally controlled within the range of 70*10ˉ6~130*10ˉ6Ω·m. When the temperature rises, the resistivity will also increase. If the steel strip is used as a heating material, the resistivity should be selected as low as possible.
(5) Magnetic permeability
Generally speaking, the magnetic permeability of austenitic steel strip itself is very small, so this material is also called non-magnetic material. For steel strips with a relatively stable austenitic structure, such as 0 Cr 20 Ni 10 and 0 Cr 25 Ni 20, large deformation treatment is performed during processing, and the material will not be magnetic.
And high-carbon, high-nitrogen, high-manganese austenitic steel strips, such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N, etc., are processed under high pressure, and it will be found that the steel strip will undergo phase transformation to ensure that it remains non-magnetic.
Under high temperature conditions above the Curie point, even very strong magnetic steel strips will lose their magnetic properties. However, there are also some austenitic steel strips, because their own structure is a metastable austenite structure. When processed at low temperature, martensitic transformation will occur, which increases the magnetic permeability.
(6) Modulus of elasticity
At room temperature, the longitudinal elastic modulus of ferritic steel strip is generally 200kN/mm2, and the longitudinal elastic modulus of austenitic steel strip is slightly lower, only 193 kN/mm2. As the temperature increases, the longitudinal elastic modulus generally decreases. The longitudinal modulus of elasticity affects the hardening of the steel.
(7) Density
The chromium content of ferritic steel strip is relatively high, but the density is relatively small, while the nickel content and manganese content of austenitic steel strip are relatively high, but the density is relatively large. The increased spacing results in a smaller density.
It can be known that the seven physical properties of aisi 310 stainless steel coil strip are all related to temperature. I hope everyone needs to master the temperature during processing to ensure the stability of its physical properties.