The pitting and intergranular corrosion resistance of 304L and 321 austenitic stainless steel plates were analyzed by electrochemical and chemical immersion methods. The results show that the breakdown potential Eb of 304L is higher, and Eb-Ep is larger. The pitting corrosion resistance of 304L is stronger than that of 321, but the repairing ability of passivation film is weaker than that of 321. In the intergranular corrosion immersion test, the 321 grain boundary corrosion is deep, delineating the complete grain boundary, while the grain boundary corrosion of 304L stainless steel is generally slight, which does not see the complete grain boundary contour, which indicates that 304L is resistant to intergranular Can replace 321 stainless steel when used in corrosive fields.
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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About 904L stainless steel plate:There are three types of 904L stainless steel plates: hot-rolled stainless steel plates, cold-rolled stainless steel plates, and finish-rolled stainless steel plates. 904L super austenitic stainless steel is a low-carbon, high-nickel, molybdenum austenitic stainless and acid-resistant steel. It is a proprietary material imported from France H·S. It has good activation-passivation transformation ability, excellent corrosion resistance, good corrosion resistance in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, and phosphoric acid, and good corrosion resistance in neutral chloride-containing media It has good pitting corrosion resistance and good resistance to crevice corrosion and stress corrosion. It is suitable for sulfuric acid of various concentrations below 70°C, and has good corrosion resistance in acetic acid at any concentration and at any temperature and mixed acid of formic acid and acetic acid under normal pressure.Super austenitic stainless steel 904L (00Cr20Ni25Mo4.5Cu, UNS: N08904, EN: 1.4539) is a highly alloyed austenitic stainless steel with very low carbon content. It has good corrosion resistance in dilute sulfuric acid and is specially designed for Designed for harsh environments with corrosive conditions. It has a high chromium content and sufficient nickel content. The addition of copper makes it highly resistant to acid, especially to chloride crevice corrosion and stress corrosion cracking. It is not easy to appear corrosion spots and cracks, and is resistant to spots. Slightly better corrosion ability than other steel grades, has good workability and weldability, and can be used for pressure vessels 1) The cold-rolled product has good gloss and beautiful appearance; 2) Due to the addition of Mo, it has excellent corrosion resistance, especially pitting corrosion resistance; 3) Excellent high temperature strength. 4) Excellent work hardening (weak magnetic properties after processing) 5) The solid solution state is non-magnetic; 6) Compared with 304 stainless steel, the price is higher.EASTKING STEEL can provide you with a large number of 904L stainless steel products. High quality and fast supply. Please feel free to click to consult.