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Selection of heat-resistant stainless steel
Source:Xinsteel Date:2020/7/3
Heat-resistant steel refers to steel that has high oxidation resistance and high-temperature strength at high temperatures. Heat-resistant steel includes oxidation-resistant steel and heat-strength steel.
The characteristic of oxidation-resistant steel is that it has good oxidation resistance at high temperature (no skin) and has a certain strength. Among the alloying elements, the elements that can play the role of oxidation resistance are chromium, nickel, aluminum, silicon, Among them, chromium can not only form a dense and stable oxide film on the surface of steel, but also improve the high temperature strength of steel, so chromium is the basic element of heat-resistant steel. Commonly used austenitic oxidation-resistant steels include 06Cr25Ni20 (310S), 06Cr23Ni13 (309S), 16Cr23Ni13 (309), 06Cr20Ni11, 06Cr25Ni13, 14Cr23Ni18 and so on.
The characteristic of hot-strength steel is that it not only has good oxidation resistance at high temperature, but also has high high-temperature strength. This is because a workpiece that is subjected to a load for a long time at a high temperature will undergo plastic deformation or even break. High-strength steel contains a large amount of elements such as nickel, manganese, and chromium that stabilize austenite. In addition, in order to improve the heat strength, carbides such as vanadium and niobium are added to the steel. Commonly used heat-strength steels are 53Cr21Mn9Ni4N, 22Cr20Mn10Ni2Si2N, 26Cr18Mn12Si2N, 45Cr14Ni14W2Mo and so on.
