Thermal heat resistance refers to its excellent physical and mechanical properties that can still maintain stainless steel at high temperature.
Impact of carbon: Carbon is a strong formation of Austenite stainless steel and stabilizing the austenite and expanding the Austenitic region. The ability of carbon to form austenitic is about 30 times that of nickel. Carbon is a gap element. It can significantly improve the strength of Austenite stainless steel through solid -soluble enhancement. Carbon can also improve the resistance to resistance and corrosion resistance in high thick chloride (such as 42%mgCl2 boiling solution).
However, in the austenitic stainless steel, carbon is often regarded as harmful elements. This is mainly due to some conditions (such as welding or heating through 450 ~ 850 ° C) under some conditions in stainless steel). Carbon can be as good as steel and steel in steel. Chromium forming a high chromium CR23C6 carbon compound, which leads to the poverty of local chromium, which reduces the corrosion resistance of steel, especially the corrosion resistance of crystal resistance. therefore. Since the 1960s, the newly developed chromium -nickel Austeenian stainless steel is mostly carbon content less than 0.03%or 0.02%ultra -low -carbon type. You can know that as the carbon content decreases, the sensitivity of the crystal corrosion of steel is reduced. 0.02%has the most obvious results. Some experiments also pointed out that carbon can also increase the tendency of point corrosion points of chromium Aozoi stainless steel. Due to the harmful effect of carbon, not only should the carbon content be controlled as low as possible in the process of smelting the austenite stainless steel, but also in the process of subsequent heat, cold processing and heat treatment, but also to prevent the surface of stainless steel to increase carbon surface and avoid chromium carbides that avoid chromium carbides Elected.
Post time: Feb-13-2023