1.4372, X12CrMnNiN17-7-5, AISI 201, 12H17G9AN4 - stainless steel

1.4372, X12CrMnNiN17-7-5, AISI 201, 1H17N4G9 - stainless steel according to EN 10088.

1.4372, X12CrMnNiN17-7-5, AISI 201, 1H17N4G9 – description

The steel is used for household appliances (pots, trays, sinks, washing machines, refrigerators), dairy equipment (tanks, vats, pasteurizers, centrifuges), brewery equipment (fermentation tanks, barrels), catering equipment (refrigerated cabinets, buffet tables, but pressed boilers for cooking salty dishes must be saturated after forming), equipment and fittings in the chemical, petrochemical and paper industries (heat exchangers, coolers, tanks, pumps, pipelines), architectural facade and interior window frames and other elements, automotive accessories (wipers, bumpers, hubcaps), equipment for passenger trains and ships, as well as medical and dental instruments and vessels.

The steel is non-magnetic, ductile (even in low temperature), very drawable, weldable, highly strain-hardenable, has good yield strength and can be easy polished, either by mechanical or electrochemical means. On the downside, it has poor machinability.

The steel is resistant to urban, rural and non-extreme industrial air, distilled, fresh and river water, salt solutions (nitrates, phosphates, chromates, carbonates, some organic acids) and food products (milk, beer, coffee, tea, oil, alcohol, juice).

The steel is partly resistant to pitting and crevice corrosion, as well as inorganic acids, for example nitric acid.

The steel is not resistant to intergranular corrosion, chloride induced stress corrosion cracking, and reducing environments (e.g. hydrocloric acid), as well as sulphates and chlorides.

The steel belongs to welding group ISO 8.3. It can be welded manually with SMAW and GMAW methodes. Preheating is not required. Afterheating is unnecessary in most cases, but if the weld joint is supposed to operate in an environment conducive to intergranular corrosion, the weld joint should be heated to more that 1050 °C and cooled in water or air.

Physical and mechanical properties

Physical properties and general mechanical properties of 1.4372:

• In ambient temperature:
  • Density: 7.8 g/cm³
  • Specific heat capacity: 0,5 kJ/(kg*K)
  • Electrical resistivity: 0.7 Ω*cm
  • Thermal conductivity: 15 W/(m*K)
  • Young's modulus E: 200 GPa
• At 100°C:
  • Young's modulus E: 194 GPa
• At 200°C:
  • Young's modulus E: 186 GPa
• At 300°C:
  • Young's modulus E: 179 GPa
• At 400°C:
  • Young's modulus E: 172 GPa
• At 500°C:
  • Young's modulus E: 165 GPa

Physical properties of 1.4372 steel strips for springs:

• In delivery condition (solutioned):
  • Young's modulus E: 200 GPa
• When cold rolled and heat treated:
  • Young's modulus E: 210 GPa

Mechanical properties of 1.4372 steel:

• Strips for springs:
  • Strain hardened condition +C850
    • Tensile strength Rm: 850-1000 MPa
    • Elongation A: > 25 %
  • Strain hardened condition +C1000
    • Tensile strength Rm: 1000-1150 MPa
    • Elongation A: > 13 %
  • Strain hardened condition +C1150
    • Tensile strength Rm: 1150-1300 MPa
    • Elongation A: > 5 %
  • Strain hardened condition +C1300
    • Tensile strength Rm: 1300-1500 MPa
    • Elongation A: > 2 %
  • Strain hardened condition +C1500
    • Tensile strength Rm: 1500-1700 MPa
    • Elongation A: > 1 %
• Cold rolled strip:
  • Yield strength Re: > 350 MPa
  • Tensile strength Rm: 750-950 MPa
  • Elongation A: > 45 %
• Hot rolled strip and plate:
  • Yield strength Re: > 330 MPa
  • Tensile strength Rm: 750-950 MPa
  • Elongation A: > 40 %
  • Impact energy KV: > 60 J

Mechanical properties of 1.4372 steel in high temperature:

• At 100°C:
  • Yield strength Re: > 295 MPa
• At 150°C:
  • Yield strength Re: > 260 MPa
• At 200°C:
  • Yield strength Re: > 230 MPa
• At 250°C:
  • Yield strength Re: > 220 MPa
• At 300°C:
  • Yield strength Re: > 205 MPa
• At 350°C:
  • Yield strength Re: > 185 MPa

Mechanical properties of 12Ch17G9AN4, 12Х17Г9АН4, ЭИ878 steel:

• Strips:
  • Soft ribbon:
    • Thickness: <0.2 mm
      • Tensile strength Rm: > 640 MPa
      • Elongation A: > 20 %
    • Thickness: 0.2-2.0 mm
      • Tensile strength Rm: > 640 MPa
      • Elongation A: > 40 %
  • Semi cold-worked:
    • Thickness: <0.2 mm
      • Tensile strength Rm: 830-1000 MPa
      • Elongation A: > 15 %
    • Thickness: 0.2-2.0 mm
      • Tensile strength Rm: 830-1000 MPa
      • Elongation A: > 30 %
  • Cold-worked:
    • Thickness: <0.2 mm
      • Tensile strength Rm: > 1000 MPa
      • Elongation A: > 7 %
    • Thickness: 0.2-2.0 mm
      • Tensile strength Rm: > 1000 MPa
      • Elongation A: > 13 %
  • Extra cold-worked:
    • Thickness: <0.2 mm
      • Tensile strength Rm: > 1200 MPa
      • Elongation A: > 3 %
    • Thickness: 0.2-2.0 mm
      • Tensile strength Rm: > 1200 MPa
      • Elongation A: > 5 %

• Rods:
  • Softened condition:
    • Yield strength Re: > 345 MPa
    • Tensile strength Rm: > 690 MPa
    • Elongation A: > 40 %
    • Percent reduction of area Z: > 55 %
  • Hard-drawn condition:
    • Tensile strength Rm: > 980 MPa
    • Elongation A: > 15 %

Heat treatment and working

Recommended working and heat treatment parameters for 1.4372 alloy:

• Forging: 1150-900 °C
• Rolling: 1150-900 °C
• Solutioning: 1020-1100 °C

We deliver this steel alloy as:

• Round bars
• Sheets
• Strips

Replacements, equivalents and other designations:

1.4372, 12Ch17G9AN4, 12Х17Г9АН4, ЭИ878-Ш, EI878, 12H17G9AN4, 12Cr17Mn6Ni5N, 12Cr18Mn9Ni5N, Z12CMN17-07, X12CrMnCiN18-9-5, SUS201, SUS 202, 1H17N4G9, STS201KSD, 201, 202, S20100, S20200, 1.4373, X12CrMnNiN18-9-5