Nickel-Chrome Alloy

Cr30Ni70

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Cr30Ni70 is a nickel-chromium alloy recognized for its excellent oxidation resistance, high thermal strength, and stable performance under high-temperature conditions. With a low positive temperature coefficient, it maintains superior plasticity, cold stamping properties, and welding performance at room temperature. After undergoing solution treatment, the alloy forms a stable single-phase austenitic structure, ensuring consistent operation throughout its service life.

Specifications
  • Wire Wire 0.05-7.5
  • Rod Rod 8-50
  • Flat Wire Flat Wire (0.05-0.35)*(0.5-6.0)
  • Strip/Foil Strip/Foil (0.5-2.5)*(5-40)
Chemical Composition
  • Nickel (Ni): Rest
  • Chromium (Cr): 28.0-31.0
  • Iron (Fe): ≤1.0
Physical & Mechanical Properties
  • Grade: Cr30Ni70
  • Max. Service Temperature (°C): 1250
  • Melting Point (°C): 1380
  • Density (g/cm³): 8.1
  • Resistivity at 20℃ (μΩ•m): 1.18±0.05
  • Elongation at Rupture (%): ≥20
  • Specific Heat (J/g.℃): 0.461
  • Thermal Conductivity (KJ/m.h.ºC): 45.2
  • Coefficient of Lines Expansion (α×10⁻⁶/20~1000ºC): 17
  • Micrographic Structure: Austenite
  • Magnetic Properties: Non-magnetic