Stainless steel 304 pipe is widely used in the production of corrosion-resistant and formability equipment and parts due to its good heat resistance. At present, 304 stainless steel pipe has been widely used in food, chemical, atomic energy, and other industrial equipment and decoration fields.
National standard 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: Grades 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，
Stainless Steel 304, TP304, 304L are simply distinguished:
①304 and TP304: 304 belong to the national standard, grade 0Cr18Ni9, TP is the abbreviation of Tube/Pipe, it is the expression method of American standard, it mainly used Stainless steel pipes for piping; GB 304 and TP304 have different carbon content and phosphorus content. The main difference lies in the difference in Cr and chromium content. The chromium content of TP304 is one higher, reaching more than 18, so its corrosion resistance and price are better than The national standard 304 is slightly higher.
②Comparison between 304 and 304L: The main difference between 304L and 304 is the difference in carbon content. The carbon content of 304 is less than or equal to 0.08, while the carbon content of 304L is less than or equal to 0.03; secondly, 304 is universal stainless steel. It is widely used to make equipment and parts that require good comprehensive performance (corrosion resistance and formability), and 304L is a variant of 304 stainless steel with a lower carbon content, used in occasions that require welding. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause stainless steel to produce intergranular corrosion in certain environments.
Comparison table of 304 grades at home and abroad:
| Serial number | National standard | Japanese | American standard | British | German standard |
|---|---|---|---|---|---|
| 304 | 0Cr18Ni9 | SUS304 | TP304 | 304S15 | X5Cr-Ni18 |