The standard martensitic stainless steels are: 410, 414, 416, 416(Se), 420, 431, 440A, 440B and 440C, which are magnetic; the corrosion resistance of these steels comes from "chromium", which ranges from 11.5 to 18%, the higher the chromium content, the higher the carbon content is required to ensure the formation of martensite during the heat treatment. The above three types of 440 stainless steel are rarely considered for applications that require welding, and the 440 type composition is filled Metal is not easy to obtain.
The improvement of standard martensitic steel contains additional elements such as nickel, molybdenum, vanadium, etc., which are mainly used to increase the restricted allowable working temperature of standard steel to higher than 1100K. When these elements are added, the carbon content also increases. As the carbon content increases, the problem of avoiding cracks in the hardened heat-affected zone of the weld becomes more serious.
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