What will be the changes in the performance of colored stainless steel decorative panels at low temperatures?
I believe you all know stainless steel this material, corrosion resistance is its foothold in the material industry rely on, in recent years, in order to adapt to more application scenarios, people are constantly developing new stainless steel models, you can choose the right model according to different uses, now in a variety of high temperature scenes will see the figure of stainless steel, then the problem comes, Since people are focused on the research and development of high-temperature resistant stainless steel, is it necessary to develop low-temperature resistant stainless steel? What is the effect of low temperature on the performance of colored stainless steel decorative plate? What happens to the plate itself?
In relation to the case of a cryogenic appliance, etc. Because the ferritic stainless steel is a body-centered cubic structure, when the material properties are weak, sharp cracks will rapidly expand and cause brittle damage. Therefore, the 400 series does not have too prominent low temperature resistance, and the 300 series austenitic stainless steel has quite high attainments in this regard, and listen to me about the characteristics of the performance of austenitic stainless steel in low temperature environment.
According to the relevant test report shows that at extremely low temperatures, the tensile strength and yield strength of austenitic stainless steel will increase with the decrease of temperature, and there is a more obvious increase in tensile strength, low temperature austenitic stainless steel will have a large number of plastic deformation before breaking, so the material embrittlement tendency is small;
At the same time, austenitic stainless steel also has a low thermal conductivity and specific heat capacity, which means that when the temperature decreases, the thermal conductivity and specific heat capacity will also decrease; Relatively low thermal conductivity will reduce its heat transfer at low temperatures, which will effectively reduce the heat loss of the material itself, thereby protecting the performance of the material at low temperatures.
The metal thermal expansion coefficient causes the low temperature storage tank to have different deformation at different temperatures, which increases the fatigue load of the low temperature storage tank, so the low temperature storage tank needs a small thermal expansion coefficient. For austenitic stainless steel, the coefficient of thermal expansion increases with the decrease of temperature. Therefore, when welding austenitic stainless steel, in addition to meeting the requirements of mechanical properties, it is also necessary to choose a welding material with a comparable thermal expansion coefficient.
But even in the low temperature environment, stainless steel can work normally there is a limit, the more important elements in stainless steel are nickel and carbon, under normal circumstances, when the nickel content reaches 3.5% can be used at a low temperature of -100 ° C, if the nickel content reaches 9%, there is no problem in the low temperature environment used at -196 ° C. If the nickel content in the stainless steel material is high, the limit can reach -650 ° C, so 304 stainless steel is suitable as the theme material of the frozen storage tank.
