Commonly used digital symbols of stainless steel models are 200 series, 300 series and 400 series. They are the representation methods of the United States, such as 201, 202, 302, 303, 304, 316, 410, 420, 430, etc. China's stainless steel models are added with elemental symbols. Words indicate, such as 1Cr18Ni9, 0Cr18Ni9, 00Cr18Ni9, 1Cr17, 3Cr13, 1Cr17Mn6Ni5N, etc., and numbers indicate the corresponding element content.
200 series: chromium-nickel-manganese austenite stainless steel
300 series: chromium-nickel austenitic stainless steel
301: Good ductility for molding products. It can also be hardened by speed. Good welding. The wear resistance and fatigue strength are better than that of 304 stainless steel.
302: Corrosion resistance is the same as 304, and the strength is better due to the relatively high carbon content.
302B: It is a stainless steel with high silicon content, which has high resistance to high temperature oxidation.
303: It is more machined by adding a small amount of sulfur and phosphorus.
303Se: It is also used to make machine parts that require hot 镦, because this stainless steel has good heat machinability under such conditions.
304: 18/8 stainless steel. The GB card number is 0Cr18Ni9. 309: Better temperature resistance than 304.
