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The ordinary Stainless Steel is divided into three types: Austenitic stainless steel, iron type stainless steel, Martensitic stainless steel. On the basis of these three basic metallographic structures, for specific needs and purposes, the two phase steel, precipitation-hardened stainless steel and high alloy steel with iron content less than 50% have been derived.
1, 304 stainless steel. It is one of the most widely used austenitic stainless steel. It is suitable for manufacturing deep drawing parts and acid pipes, containers, structural parts, all kinds of instrument bodies, etc. It can also manufacture non-magnetic and low-temperature equipment and parts.
2. 304L stainless steel. In order to solve the serious intergranular corrosion tendency of 304 stainless steel caused by Cr23C6 precipitation under some conditions, the sensitized state intergranular corrosion resistance of ultra-low carbon austenitic stainless steel is significantly better than 304 stainless steel. Except for slightly lower strength, other properties of 321 stainless steel, mainly used for corrosion resistant equipment and parts that need to be welded and can not be treated with solid solution, can be used to manufacture all kinds of instrument body, etc.
3, 304H stainless steel. 304 stainless steel internal branch, carbon mass fraction in 0.04%-0.10%, high temperature performance is better than 304 stainless steel.
4, 316 stainless steel. By adding molybdenum to 10Cr18Ni12 steel, the steel has good resistance to reducing medium and point corrosion. In seawater and other media, corrosion resistance is better than 304 stainless steel, mainly used for pitting resistance materials.
5, 316L stainless steel. Ultra-low Carbon Steel, with good resistance to sensitized intergranular corrosion, suitable for the manufacture of thick section size welded parts and equipment, such as corrosion resistant materials in petrochemical equipment.
6, 316H stainless steel. 316 stainless steel internal branches, carbon mass fraction in 0.04%-0.10%, high temperature performance is better than 316 stainless steel.
(By Dana)
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