1.4580, X6CrNiMoNb17-12-2, AISI 316Cb - stainless steel

1.4580, X6CrNiMoNb17-12-2, AISI 316Cb, UNS S31640 - austenitic stainless steel with Niobium addition acc. to EN 10088-1.

1.4580 / X6CrNiMoNb17-12-2, Z6CNDNb17-12 – description

The alloy is used for fasteners, heat exchangers, coolers, tanks, pumps, pipelines and similar equipment of refineries, paper mills, food processing plants and chemical plants. It is resistant to intergranular corrosion.

According to PN-EN ISO 3506, 1.4580 is an A5 class stainless steel for fasteners. That means the thread smaller than 24mm in diameter has strength class of 80, and the elongation A equals 0.3 * the nominal diameter of the thread.

The alloy cannot be hardened and is non-magnetic. Niobium is the stabilizer.

Physical and mechanical properties

1.4580 - general physical and mechanical properties:

• In ambient temperature:
  • Density: 8 g/cm³
  • Specific heat capacity: 0.5 kJ/(kg*K)
  • Thermal conductivity: 15 W/(m*K)
  • Young's modulus E: 200 GPa
  • Electrical resistivity: 0.75 µΩ*m
  • Linear expansion coefficient: 16.5 (10^-6/K)
• Testing temperature: 100°C:
  • Linear expansion coefficient: 16.5 (10^-6/K)
  • Young's modulus E: 194 GPa
• Testing temperature: 200°C:
  • Linear expansion coefficient: 17.5 (10^-6/K)
  • Young's modulus E: 186 GPa
• Testing temperature: 300°C:
  • Linear expansion coefficient: 18.0 (10^-6/K)
  • Young's modulus E: 179 GPa
• Testing temperature: 400°C:
  • Linear expansion coefficient: 18.5 (10^-6/K)
  • Young's modulus E: 172 GPa
• Testing temperature: 500°C:
  • Linear expansion coefficient: 19.0 (10^-6/K)
  • Young's modulus E: 165 GPa

1.4580 mechanical properties in hot rolled and solution annealed condition (+AT):

• Forgings:
  • General parameters:
    • Yield strength Re: 220-250 MPa
    • Tensile strength Rm: 520-720 MPa
    • Elongation A: > 40 %
    • Impact energy KV. 20°С: > 100 J
    • Hardness HBW: < 230
  • Longitudial test pieces:
    • Impact energy KV. 20°С: > 100 J
  • Transverse test pieces:
    • Elongation A: > 40 %
    • Impact energy KV. 20°С: > 60 J
    • Impact energy KV. -196°С: > 60 J
• High temperature test:
  • Testing temperature: 50°C:
    • Yield strength Re: > 207 MPa
    • Tensile strength Rm: > 490 MPa
  • Testing temperature: 100°C:
    • Yield strength Re: > 185 MPa
    • Tensile strength Rm: > 440 MPa
  • Testing temperature: 150°C:
    • Yield strength Re: > 177 MPa
    • Tensile strength Rm: > 410 MPa
  • Testing temperature: 200°C:
    • Yield strength Re: > 167 MPa
    • Tensile strength Rm: > 390 MPa
  • Testing temperature: 250°C:
    • Yield strength Re: > 157 MPa
    • Tensile strength Rm: > 385 MPa
  • Testing temperature: 300°C:
    • Yield strength Re: > 145 MPa
    • Tensile strength Rm: > 375 MPa
  • Testing temperature: 350°C:
    • Yield strength Re: > 140 MPa
    • Tensile strength Rm: > 375 MPa
  • Testing temperature: 400°C:
    • Yield strength Re: > 135 MPa
    • Tensile strength Rm: > 375 MPa
  • Testing temperature: 450°C:
    • Yield strength Re: > 131 MPa
    • Tensile strength Rm: > 370 MPa
  • Testing temperature: 500°C:
    • Yield strength Re: > 129 MPa
    • Tensile strength Rm: > 360 MPa
  • Testing temperature: 550°C:
    • Yield strength Re: > 127 MPa
    • Tensile strength Rm: > 330 MPa

Heat treatment and working

Recommended working and heat treatment parameters for X6CrNiMoNb 17-12-2 alloy:

• Forging: 1150-850 °C
• Rolling: 1150-850 °C
• Solutioning: 1030-1110 °C

We deliver this steel alloy as:

• Rods
• Sheets
• Tubes
• Forgings