1. The full name of 304 stainless steel pipe is SUS304 stainless steel pipe;
2. SUS304 stainless steel pipe belongs to the stainless steel pipe of American grade, and the domestic grade is equivalent to 0Cr19Ni9 stainless steel pipe, which is usually replaced by 0Cr18Ni9;
3. 201 series - chromium-nickel-manganese austenitic stainless steel;
4. 300 series - chromium-nickel austenitic stainless steel;
5. 301—good ductility, used for forming products, and can also be rapidly hardened by machining, with good weldability, wear resistance and fatigue strength better than 304 stainless steel;
6. 302-corrosion resistance is the same as 304, because the carbon content is relatively high, so the strength is better;
7. 303 - by adding a small amount of sulfur and phosphorus, it is easier to cut than 304;
8. 304—general model; that is, 18/8 stainless steel, GB grade is 0Cr18Ni9;
9. 309—has better temperature resistance than 304;
10. 316 - after 304, the second most widely used steel grade, mainly used in the food industry and surgical equipment, adding molybdenum elements to obtain a special structure that is resistant to corrosion; Good resistance to chloride corrosion is therefore also used as "marine steel"; SS316 is usually used in nuclear fuel recovery units; 18/10 grade stainless steel is usually also suitable for this application level;
11. Model 321 - similar to 304 except that the risk of corrosion of material welds is reduced due to the addition of titanium elements;
12. 400 series - ferritic and martensitic stainless steels;
13. 408—good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni;
14. 409—the cheapest model (British and American), usually used as a car exhaust pipe, is a ferritic stainless steel (chrome steel);
15. 410—martensite (high-strength chromium steel), with good wear resistance and poor corrosion resistance;
16, 416—added sulfur to improve the processing properties of the material;
17. 420—“cutting tool grade” martensitic steel, the earliest stainless steel similar to Brinell high chromium steel, is also used for surgical knives and can be made very bright;
18, 430—ferritic stainless steel, used for decoration, such as for automotive accessories, good formability, but poor temperature resistance and corrosion resistance;
19. 440—high-strength cutting tool steel with slightly higher carbon content. After proper heat treatment, higher yield strength can be obtained, and the hardness can reach 58HRC. It is among the hardest stainless steels. The most common application example is "razor blades" ”, there are three commonly used models: 440A, 440B, 440C, and 440F (easy to process);
20, 500 series - heat-resistant chromium alloy steel;
21. 600 series - martensitic precipitation hardening stainless steel;
22, 630—the most commonly used type of precipitation hardening stainless steel, usually also called 17-4; 17%Cr, 4%Ni.