The distinction among 304, TP304, and 304L

304 stainless steel pipe with its good heat resistance, and is widely used in the production of corrosion-resistant and forming the equipment and mechanical parts. At present, 304 stainless steel pipe has been widely used in food, chemical, atomic and other industrial equipment and decoration areas.

GB 304 Chemical composition: grades 0Cr18Ni9, C≤0.08, Si≤1.00, Mn≤2.00, P≤0.035, S≤0.030, Ni: 8.00-11.00, Cr: 17.00-19.00

TP304 Chemical composition: C≤0.08, Si≤1.00, Mn≤2.00, P≤0.045, S≤0.030, Ni: 8.00-11.00, Cr: 18.00-20.00

304L Chemical composition: Grade 00Cr18Ni10, C≤0.03, Si≤1.00, Mn≤2.00, P≤0.035, S≤0.030, Ni: 8.00-11.00, Cr: 18.00-20.00,

304, TP304, 304L Simple distinction: ① 304 and TP304: 304 is the national standard, grade 0Cr18Ni9, TP is the abbreviation of Tube / Pipe, is the American standard representation, it is mainly used for piping with stainless steel; GB 304 and TP304, carbon content and Phosphorus content is different, the main difference is the difference between Cr chromium content, which TP304 chromium content is higher, reaching more than 18, so its corrosion resistance and price than the national standard 304 slightly higher.

② 304 and 304L comparison: 304L and 304 is the main difference between the different carbon content, of which 304 carbon content is less than or equal to 0.08, and 304L carbon content is less than or equal to 0.03; Secondly, 304 is a versatile stainless steel, It is widely used in the manufacture of equipment and components that require good overall performance (corrosion resistance and formability), and 304L is a variant of 304 stainless steel with a low carbon content for applications where welding is required. The lower carbon content minimizes the amount of carbides that are precipitated in the heat affected zone near the weld, and the precipitation of the carbide can cause the intergranular corrosion of the stainless steel in some environments.

Domestic and foreign 304 grade table:

Source: China Stainless Steel Pipe Manufacturer - Yaang Pipe Industry Co., Limited (www.yaang.com)