The following are the types of stainless steel, the higher the number, the higher the price. 600 series grades are the best
According to the composition, it can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni (200 series), heat-resistant chromium alloy steel (500 series) and precipitation hardening system (600 series). the
200 series: chromium-manganese-nickel 201, 202, etc.: Substitute manganese for nickel, which has poor corrosion resistance and is widely used as a cheap substitute for 300 series in China.
300 series: chromium-nickel austenitic stainless steel
301: Good ductility, used for molding products. It can also be hardened by mechanical processing. Good weldability. Wear resistance and fatigue strength are better than 304 stainless steel. the
302: The corrosion resistance is the same as that of 304, and the strength is better due to the relatively high carbon content. the
303: By adding a small amount of sulfur and phosphorus, it is easier to cut than 304. the
304: General model; that is, 18/8 stainless steel. Products such as: corrosion-resistant containers, tableware, furniture, railings, medical equipment. The standard composition is 18 % chromium plus 8 % nickel. It is a stainless steel that is non-magnetic and cannot change its metallographic structure by heat treatment. The GB grade is 0Cr18Ni9. 304 L: The same characteristics as 304, but low carbon, so it is more corrosion resistant and easy to heat treatment, but its mechanical properties are poor. It is suitable for welding and products that are not easy to heat treatment. the
304 N: It has the same characteristics as 304. It is a nitrogen-containing stainless steel. Nitrogen is added to increase the strength of the steel. the
309: Compared with 304, it has better temperature resistance, and the temperature resistance is as high as 980 °C. the
309 S: It has a lot of chromium and nickel, so it has good heat resistance and oxidation resistance. Products such as: heat exchangers, boiler components, and jet engines. the
310: Excellent high temperature oxidation resistance, the maximum service temperature is 1200°C. the
316: After 304, the second most widely used steel grade is mainly used in the food industry, watch accessories, pharmaceutical industry and surgical equipment. Adding molybdenum element makes it obtain a special corrosion-resistant structure. Because it has better resistance to chloride corrosion than 304, it is also used as "marine steel". SS316 is usually used in nuclear fuel recovery units. Grade 18/10 stainless steel is also generally suitable for this application level. the
316 L: Low carbon, so it is more corrosion-resistant and easy to heat treatment. Products such as: chemical processing equipment, nuclear power generators, and refrigerant storage tanks. the
321: In addition to reducing the risk of material weld corrosion due to the addition of titanium, other properties are similar to 304. the
347: Add the stabilizing element niobium, suitable for welding aircraft parts and chemical equipment. 400 series: Ferritic and martensitic stainless steel, manganese-free, can replace 304 stainless steel to a certain extent. 408: Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
