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Stainless Steel - Grade 302 / 1.4310

Description

Stainless Steel Grade 302/1.4310 is an austenitic chromium-nickel stainless steel that is known for its corrosion resistance and high strength. It is essentially a higher carbon version of 304 stainless steel, providing enhanced strength and hardness. This grade is widely used in applications that require a good combination of strength, corrosion resistance, and formability.

Chemical Composition

  • Chromium (Cr): 17.0 - 19.0%
  • Nickel (Ni): 8.0 - 10.0%
  • Carbon (C): ≤ 0.15%
  • Manganese (Mn): ≤ 2.0%
  • Silicon (Si): ≤ 1.0%
  • Phosphorus (P): ≤ 0.045%
  • Sulfur (S): ≤ 0.030%

    • Mechanical Properties

  • Tensile Strength: 620 MPa (min)
  • Yield Strength (0.2% offset): 275 MPa (min)
  • Elongation: 40% (in 50mm)
  • Impact Energy (ISO-V): 60 J at -20°C, 50 J at -40°C
  • Hardness: 201 HB (Brinell), 92 HRB (Rockwell B)

    • Thermal & Physical Properties

  • Density: 7.9 g/cm³
  • Melting Point: 1400°C - 1450°C
  • Specific Heat: 500 J/kg•K
  • Thermal Conductivity: 16.2 W/m•K at 100°C
  • Electrical Resistivity: 0.720 µΩ•m at 20°C
  • Modulus of Elasticity: 193 GPa

    • Other Designations

  • UNS: 193 GPa
  • ASTM: 193 GPa
  • EN: 193 GPa
  • JIS: 193 GPa
  • AFNOR: 193 GPa

    • Fabrication and Heat Treatment

  • Cold Working: Grade 302/1.4310 can be cold worked to improve hardness, strength, and elasticity.
  • Hot Working: Hot working should be performed at temperatures ranging from 1149°C to 1260°C, followed by rapid cooling to maintain corrosion resistance.
  • Annealing: Annealing should be done at temperatures between 1010°C and 1120°C followed by rapid cooling.
  • Welding: This grade can be welded using most conventional welding techniques, though post-weld annealing is recommended to ensure maximum corrosion resistance.

    • Applications

  • Automotive: Springs, washers, and various stamped components.
  • Food and Beverage: Equipment and utensils due to its corrosion resistance.
  • Aerospace: Aircraft and aerospace structural components.
  • Industrial:Conveyor belts, screens, and woven or welded screens.
  • Medical:Surgical instruments and medical apparatus.

    • Supplied Forms

  • Bars
  • Coils
  • Wires

    • Features

  • Corrosion Resistance: Excellent resistance to a wide range of corrosive environments.
  • Strength:High tensile and yield strength.
  • Formability:Good formability and can be easily drawn, spun, and formed.
  • Durability:High hardness and wear resistance.
  • Weldability:Can be welded using conventional techniques with post-weld annealing recommended.
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