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Ferritic/ Mastensitic/ Precipitation

Ferrite series

  • Body Centered Cubic(BBC)
  • Heat treatment can't harden ferrite series
  • Representative steel STS430
  • Classification
    • Classification of Ferrite series
      페라이트계 강종의 분류 도표
      Type Composition Property and Feature Use
      409L 11Cr-Ti -low(C,N) It is fully ferrite STS steel that Ti is added to improve intergranular corrosivity at ordinary temperature. It has good weldability and toughness at low temperature and has better moldability than 403. Pipe for automobile
      410L 13Cr-low C It improves weldability, flexibility, workability and high temperature resistance oxidizability by reducing C. Pipe for automobile, Combustor in boiler
      430 18Cr 430, representative steel of Cr series, has lower price than austenite series and better workability and corrosion resistance, while it is not available for drawing which has sharp curve and 430 can’t be hardened by heat treatment. Part of automobile, Washer, Construction interior, Electric appliances, tanks
      430LX, 430J1L, 430CuN 18Cr-Ti,Ti or Nb-low C It improves workability and weldability by adding Ti, Nb and reducing C. Tank for seawater, Water heater, Sanitary fixture, Bicycle RIM
      434 18Cr-1Mo It has better salt resistance than 430 by adding Mo. Exterior for automobile
      436L 18Cr-1Mo -Ti, Nb, Zr-extremely low (C,N) It improves workability and weldability by reducing C and N to 434 or by adding Ti, Nb or Zr solely or in combination. Construction exterior, Part of automobile, Kitchen product, Water heater, Water supply device
      439L 18Cr-Ti It is ferrite series STS, which Cr and Ti are added and C is reduced, to improve workability, corrosion resistance and weldability. Exhauster
      443CT 21Cr-Ti-Cu It is ferrite series STS, which has equal corrosion resistance to 304 by adding Cr up to 21%. It adds Ti and Cu to improve intergranular corrosivity and moldability. Construction material, Kitchen product, Part of automobile
      444 19Cr-2MoTi, Nb, Zr -extremely low (C,N) It improves corrosion resistance by adding Mo. Storage tank, Solar water heater, Restraint of stress corrosion
  • Chemical compositions
    • Chemical compositions of Ferrite series
      페라이트계 화학성분 도표
      Type Symbol Construction material
      C Si Mn P S Cr Others
      409L STR409L1) ≤0.303 ≤1.00 ≤1.00 ≤0.040 ≤0.030 10.50~11.75 More than Ti 6xC% ~ 0.75
      430 STS430 ≤0.12 ≤0.75 ≤1.00 ≤0.040 ≤0.030 16.00~18.00 -
      430J1L STS430J1L ≤0.025 ≤1.00 ≤1.00 ≤0.040 ≤0.030 16.00~20.00 Less than N 0.025, Cu 0.30 ~ 0.80 Ti, Nb, Zr or combination of the above 8x(C%+N%) ~ 0.80
      436L STS436L ≤0.025 ≤1.00 ≤1.00 ≤0.040 ≤0.030 16.00~19.00 Mo 0.75~1.50, Less then N 0.025, Ti, Nb, Zr or combination of the above 8x(C%+N%)~0.80
      439L STS439 ≤0.030 ≤1.00 ≤1.00 ≤0.40 ≤0.030 17.00~20.00 Less than N 0.030, Ti, Nb or combination of the above 8x(C%+N%)~0.80
      444 STS444 ≤0.025 ≤1.00 ≤1.00 ≤0.040 ≤0.030 17.00~20.00 Less than N 0.025, Mo 1.75~2.50, Ti, Nb, Zr or combination of the above 8x(C%+N%) ~ 0.80
      443CT BNG443CT ≤0.025 ≤1.00 ≤1.00 ≤0.040 ≤0.03 20.00~23.00 Less than –N 0.025, Cu 0.3~0.8, Less than Ti 0.80
      445NF BNG445NF ≤0.025 ≤1.00 ≤1.00 ≤0.040 ≤0.030 20.00~23.00 Cu 1.00~3, Less than N 0.020, Cu 0.3~0.7, Less than Ti 0.50
  • Mechanical property
    • Ferrite Series

      The mechanical property of stainless steel. including tensile strength, elongation, proof stress, hardness, can be measured by examining specimen solution heat treatment or annealing heat treatment.

      페라이트계 기계적성질 도표
      Notation Symbol Yield Strength
      (N/mm²)      		 Tensile Strength
      (N/mm²)      		 Elongation
      (%)      		 Hardness
      HB HRB HV
      409L1) STR409L1 More than 175 More than 360 More than 25 Less than 167 Less than 80 Less than 175
      430 STS430 More than 205 More than 450 More than 22 Less than 183 Less than 88 Less than 200
      430J1L STS430J1L More than 205 More than 390 More than 22 Less than 192 Less than 90 Less than 200
      436L STS436L More than 245 More than 410 More than 20 Less than 217 Less than 96 Less than 230
      439L STS439 More than 175 More than 360 More than 22 Less than 183 Less than 88 Less than 200
      444 STS444 More than 245 More than 410 More than 20 Less than 217 Less than 96 Less than 230
      443CT BNG443CT More than 245 More than 410 More than 20 Less than 217 Less than 96 Less than 230
      445NF BNG445NF More than 245 More than 410 More than 25 - - Less than 200