Austenitic stainless steel was introduced in Germany in 1913, has been playing the most important role in stainless steel, its production and use of about 70% of the total production and use of stainless steel. Steel number is also the most, China commonly used austenitic stainless steel grade has more than 40, the most common is 18-8 type.
(1)1Cr17Mn6Ni15N; (2)1Cr18Mn8Ni5N; (3)1Cr18Ni9; (4)1Cr18Ni9Si3; (5)06Cr19Ni10(0Cr18Ni9); (6)00Cr19Ni10; (7)0Cr19Ni9N; (8) 0Cr19Ni10NbN; (9) 00Cr18Ni10N; (10) 1Cr18Ni12; (11) 0Cr23Ni13; (12) 0Cr25Ni20; (13) 0Cr17Ni12Mo2; (14) 00Cr17Ni14Mo2; (15) 0Cr17Ni12Mo2N; (16) 00Cr17Ni13Mo2N; (17) 1Cr18Ni12Mo2Ti; (18) 0Cr18Ni12Mo2Ti; (19) 1Cr18Ni12Mo3Ti; (20) 0Cr18Ni12Mo3Ti; (21) 0Cr18Ni12Mo2Cu2; (22) 00Cr18Ni14Mo2Cu2; (23) 0Cr19Ni13Mo3; (24) 00Cr19Ni13Mo3; (25) 0Cr18Ni16Mo5; (26) 1Cr18Ni9Ti; (27) 0Cr18Ni10Ti; (28) 0Cr18Ni11Nb; (29) 0Cr18Ni13Si4 200 Series: Chromium-Nickel-Manganese Austenitic Stainless Steel 300 Series: Chromium-Nickel Austenitic Stainless Steel Models 301: Good ductility, used for molded products. Can also be hardened rapidly by machining. Good weldability. Wear resistance and fatigue strength are superior to 304 stainless steel for products such as springs, steel structures, and wheel covers. Type 302: Same corrosion resistance as 304, but better strength due to relatively high carbon content. Type 303: By adding a small amount of sulfur and phosphorus, it is easier to cut and process than 304. Type 304: General type; i.e. 18/8 stainless steel. Products such as: corrosion-resistant containers, cutlery, furniture, railings, medical equipment, some cell phone frames. Standard composition is 18 % chromium and 8 % nickel. It is a non-magnetic stainless steel that cannot be heat treated to change its metallurgical structure. Model 304 L: Same characteristics as 304, but lower carbon, so more corrosion resistance, easy to heat treatment, but less mechanical Suitable for welding and products that are not easy to heat treatment. Model 304 N: the same characteristics as 304, is a stainless steel containing nitrogen, nitrogen is added to improve the strength of the steel. Model 309: Better temperature resistance than 304. Type 309 S: With a large amount of chromium and nickel, it has good heat resistance and oxidation resistance, such as heat exchangers, boiler components, injection engines. Type 310 S: Contains the most amount of chromium and nickel, so it has the best heat and oxidation resistance. Heat exchangers, boiler parts, and electrical equipment. Type 316: after 304, the second most widely used steel, mainly in the food industry and surgical equipment, with the addition of molybdenum to give it a special structure that resists corrosion. It is also used as a "marine steel" because of its better resistance to chloride corrosion than 304, while SS316 is commonly used in nuclear fuel recovery plants. 18/10 grade stainless steel is also commonly used in this application. It is especially used in chemical, marine and other corrosive environments, ship assembly, and building materials. Type 316 L: Low carbon and therefore more corrosion resistant, easy to heat treat, products such as: chemical processing equipment, nuclear power generators, refrigerant storage lees. Model 321: Similar to 304 except that the addition of titanium reduces the risk of corrosion in the weld seam of the material, suitable for welding brewery equipment, steam pipes, aerospace parts. Type 347: With the addition of the stabilizing element niobium, it is suitable for welding parts of aerospace appliances and chemical equipment. Strictly speaking, due to the 200 series of stainless steel in the manganese in the steel electrode potential plays a small role in the formation of oxide film protection is very low, can not play a corrosion-resistant role, so manganese alloyed austenitic stainless steel, can not be called the real "stainless steel". At present, many domestic manufacturers in the cost considerations, in the stainless steel to reduce the chromium, nickel, increased manganese content. Experts believe that the reason why stainless steel can not rust, is because of the presence of chromium and nickel, reduce the content of these two components will reduce the rust performance.
Comparison of national standard grades
GB (China) ASTM (USA) JIS (Japan) DIN (Germany)
1Cr17Ni7 301 SUS301 X12CrNi177
1Cr18Ni9 302 SUS302 X12CrNi188
1Cr18Ni10 303 SUS303 X12CrNiS188
0Cr18Ni9 304 SUS304 X5CrNi189
00Cr19Ni10 304L SUS304L X2CrNi189
0Cr17Ni12Mo2 316 SUS316 X5CrNiMo1810
00Cr17Ni14Mo2 316L SUS316L X2CrNiMo1810
0Cr18Ni10Ti 321 SUS321 X10CrNiTi189
0Cr19Ni13Mo3 317 SUS317 X2CrNiMo1816