What is stainless steel grade classification and material?
Jul 25, 2022
Stainless steel classification and material is:
200 series: chromium - manganese - nickel.
201, 202, etc. : Manganese instead of nickel, poor corrosion resistance, widely used as a cheap substitute for 300 series in China.
300 series: Chrome-nickel austenitic stainless steel.
301: Good ductility, used for molding products, can also be machined to quickly harden. Good weldability, wear resistance and fatigue strength is better than 304 stainless steel.
302: corrosion resistance with 304, due to relatively high carbon and therefore better strength.
303: It is easier to machined than 304 by adding a small amount of sulfur and phosphorus.
304: General model; So 18/8 stainless steel. The products are corrosion resistant containers, tableware, furniture, medical equipment and so on. The standard ingredient is 18 % chromium and 8 % nickel. For non magnetic stainless steel, can not be changed by heat treatment of its metallographic structure.
304 L: same as 304, but low carbon, so more corrosion resistance, easy heat treatment, but poor mechanical properties suitable for welding and not easy heat treatment products.
304 N: With the same characteristics of 304, is a stainless steel containing nitrogen, nitrogen is added to improve the strength of steel.
309: has better temperature resistance than 304, temperature resistance up to 980℃.
309s: high chromium and nickel, good heat and oxidation resistance, heat exchanger, boiler components, jet engine.
310: excellent high temperature oxidation resistance, the highest operating temperature of 1200℃.
After 304, the second most widely used steel is mainly used in the food industry, watch accessories, pharmaceutical industry and surgical equipment. Molybdenum is added to give it a special structure that is resistant to corrosion. It is also used as "Marine steel" because of its better resistance to chloride corrosion than 304. SS316 is commonly used in nuclear fuel reprocessing units.
316L: low carbon, more corrosion resistant, easy heat treatment, products such as: chemical processing equipment, nuclear power generator, refrigerant storage tank.
321: Similar to 304 except that the risk of weld corrosion is reduced due to the addition of titanium.
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