Low Expansion Invar

4J36

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Features
  • 4J36 is an alloy designed to exhibit an extremely low thermal expansion coefficient.
  • The thermal expansion coefficient is approximately 1.2×10⁻⁶ /°C in the range of 20°C to 100°C.
  • This alloy maintains its shape and size even in environments with significant temperature fluctuations.
Applications
  • Precision instruments
  • Laser instruments
  • Optical equipment
Specifications
  • Plate / Sheet
    Plate / Sheet
    Thickness: 0.1mm-20mm
    Width: 50mm-1000mm
    Length: 1000mm-6000mm
  • Strip
    Strip
    Thickness: 0.02mm-1mm
    Width: 3mm-500mm
    Delivery Forms: Bright shiny surface or anodized surface, supplied in spools or cut-to-length
  • Rod
    Rod
    Diameter: Ø3mm-Ø100mm
    Length: 100mm-2000mm
    Delivery Forms: Hot rolled, forged or turned
  • Wire
    Wire
    Diameter: Ø0.03mm-Ø6mm
    Delivery Forms: Bright shiny or anodized, supplied in spools
  • Tube
    Tube
    Outer Diameter: Ø3mm-Ø200mm
    Wall Thickness: 0.5mm-10mm
    Length: 100mm-6000mm
Chemical Composition
Elements 4J36
Carbon (C) Not greater than 0.05
Sulfur (S) 0.02
Phosphorus (P) 0.02
Manganese (Mn) 0.20-0.60
Silicon (Si) ≤0.30
Nickel (Ni) 35.0-37.0
Iron (Fe) Rest
Thermal Expansion Properties
Alloy Grade 20°C-100°C 20°C-300°C 20°C-500°C
4J36 Invar Alloy 1.2×10⁻⁶ /°C 2.5×10⁻⁶ /°C -
Mechanical Properties
Alloy Grade 4J36 Invar Alloy
Density (g/cm³) 8.1
Tensile Strength (MPa) 500-600
Yield Strength (MPa) 250-350
Hardness (HV) 150-200
Electrical Properties
Alloy Grade 4J36 Invar Alloy
Electrical Resistivity (10⁻⁶ Ω·cm) 80
Thermal Conductivity (W/m·K) 10-12
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