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Austenitic stainless steel

Austenite Series

  • Face Centered Cubic (FCC)
  • Heat treatment can't harden austenite series, while processing can harden.
  • Non magnetic (magnetic after processing)
  • Representative steel STS304
  • Classification
    • Classification of austenite series
      오스트나이트계 강종의 분류 도표
      Type Composition Property and Feature Use
      201 16Cr-9Mn-1Ni It is representative steel for 301 which has magnetic by cold working. Tableware, Decoration pipe, Construction material
      202 17Cr-6.5Mn-4.5Ni It is austenite series steel that replaces high priced Ni with Mn. It is used as low quality product in Asia by replacing 304. Tableware, Decoration pipe, Construction material
      301 17Cr-7Ni It is austenite series which have low stability and less Cr, Ni than standard 304 so that processed organic martensite is easily generated. Its tensile strength and hardness are improved by cold working. It is non magnetic under annealing while it becomes magnetic after cold working. Part of automobile, Belt conveyor bolt, Nut, Spring
      301L 17Cr-7Ni-0.1N-low C It has improved intergranular corrosivity of weld zone for high strength 301 steel and strength by adding N. Frame and exterior for train
      302 18Cr-8Ni-0.1 C It is used for press processing and has more C than 304, so that it has less corrosion resistance than 304 and has workability between 301 and 304. Construction material
      304 18Cr-8Ni 304, the most widely used steel in market, has strong mechanical property, including good corrosion resistance, heat resistance and low temperature strength, by adding Ni and it is magnetic and can’t be hardened by heat treatment. Tableware and kitchen products, Pipe, Water heater, Boiler, Bath, Muffler, Construction material
      304L 18Cr-9Ni-low c It has lower C than 304 so that shows similar corrosion resistance. After welding, it acquires corrosion resistance without heat treatment, since it has strong resistance for corrosion on grain boundary. Area where 304 is not available because of corrosion on grain boundary or parts which is not available for heat treatment, including parts for chemical industry, coal industry, petroleum industry
      316 18Cr-12Ni-2.5Mo It is Mo(2~3%) added steel to improve pitting resistance for salt, showing strong creep strength and non magnetic at high temperature. Paper, chemistry, plastic, fertilizer, picture, food industry and construction material used in coast
      316L 18Cr-12Ni-2.5Mo-low C It reduces C portion of 316 steel to give intergranular ability to 316 steel Product which is not available for heat treatment after welding
      321 18Cr-8Ni-Ti It prevents corrosion on grain boundary by adding Ti in 304 steel to use for corrosion sensitive area on grain boundary, at 450~900°C. Airplane pipe, Boiler cover
      347 18Cr-8Ni-Nb It restrains precipitation of crystallized grain boundary for used carbide to improve resistance for corrosion on grain boundary and heat resistance after welding. Identical with 321
  • Chemical compositions
    • Chemical compositions of austenite Series
      오스트나이트계 화학성분 도표
      Type Symbol Chemical Composition
      C Si Mn P S Ni Cr Others
      201 BNG201 ≤0.10 ≤0.75 8.00~10.00 ≤0.060 ≤0.030 1.00~2.00 13.00~17.00 Less than N 0.20
      Cu 1.50 ~ 2.00
      STS201 Type201 ≤0.15 ≤1.00 5.5~7.5 ≤0.060 ≤0.030 3.5~5.5 16.00~18.00 Less than N 0.25
      202 BNG202 ≤0.10 ≤1.00 3.00~9.00 ≤0.070 ≤0.030 3.00~6.00 13.00~18.00 Less than N 0.20
      Cu 1.30 ~ 3.50
      STS202 Type202 ≤0.15 ≤1.00 7.5~10.0 ≤0.060 ≤0.030 4.0~6.0 17.00~19.00 Less than N 0.25
      301 STS301 ≤0.15 ≤1.00 ≤2.00 ≤0.045 ≤0.030 6.00~8.00 16.00~18.00 -
      301L STS301L ≤0.303 ≤1.00 ≤2.00 ≤0.045 ≤0.030 6.00~8.00 16.00~18.00 Less than N 0.20
      304 STS304 ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 8.00~10.50 18.00~20.00 -
      304L STS304L ≤0.030 ≤1.00 ≤2.00 ≤0.045 ≤0.030 9.00~13.00 18.00~20.00 -
      304J1 STS304J1 ≤0.08 ≤1.00 ≤3.00 ≤0.045 ≤0.030 6.00~9.00 15.00~18.00 Cu 1.00~3.00
      305 STS305 ≤0.12 ≤1.00 ≤2.00 ≤0.045 ≤0.030 10.50~13.00 16.00~18.00 -
      316 STS316 ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 10.00~14.00 16.00~18.00 Mo 2.00~3.00
      316L STS316L ≤0.030 ≤1.00 ≤2.00 ≤0.045 ≤0.030 12.00~15.00 18.00~20.00 Mo 2.00~3.00
      321 STS321 ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 9.00~13.00 18.00~20.00 More than Ti 5xC%