Heat resistance means that stainless steel can still maintain its excellent physical and mechanical properties at high temperatures.

      Effect of carbon: Carbon is strongly formed and stable in austenitic stainless steel. Element that sets austenite and enlarges the austenite region. The ability of carbon to form austenite is about 30 times that of nickel. Carbon is a gap element. The strength of austenitic stainless steel can be significantly improved by solid solution strengthening. Carbon can also improve the stress and corrosion resistance of austenitic stainless steel in highly concentrated chlorides (such as 42% MgCl2 boiling solution).

      However, in austenitic stainless steel, carbon is often regarded as a harmful element. This is mainly due to the conditions under which the stainless steel is used for corrosion resistance (such as welding or heating at 450 ~ 850 ° C). Chromium forms a high chromium Cr23C6 type carbon compound, which results in the depletion of local chromium, which reduces the corrosion resistance of the steel, especially the resistance to intergranular corrosion. therefore. Most of the newly developed chromium-nickel austenitic stainless steels since the 1960s have ultra-low carbon types with a carbon content of less than 0.03% or 0.02%. It can be known that as the carbon content decreases, the sensitivity of intergranular corrosion of steel decreases. When the carbon content is lower than 0.02% has the most obvious effect, and some experiments have also pointed out that carbon will also increase the pitting corrosion tendency of chromium austenitic stainless steel. Due to the harmful effects of carbon, not only the carbon content should be controlled as low as possible during the austenitic stainless steel smelting process, but also the surface of the stainless steel should be prevented from increasing carbon during the subsequent hot, cold working and heat treatment, and chromium carbides should be avoided. Precipitation.

      As the stainless steel of the conveyor belt, the mechanical properties decrease in a curve at high temperatures, and slight deformations of different degrees occur, which causes problems such as deviation and short life. Therefore, different maximum temperature standards will be set according to different industries. If the material is not corrosive, a carbon steel strip with better heat resistance can be considered as the first choice.