Expansion Kovar

4J29

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Features

4J29 alloy has a matching coefficient of thermal expansion with glass and ceramics, making it suitable for airtight sealing applications.

Applications
  • Electron tube casings
  • Integrated circuit lead frames
  • Vacuum devices
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 4J29
Carbon (C) Not greater than 0.03
Sulfur (S) 0.02
Phosphorus (P) 0.02
Manganese (Mn) ≤0.50
Silicon (Si) ≤0.30
Nickel (Ni) 28.5-29.5
Cobalt (Co) 16.8-17.8
Iron (Fe) Rest
Thermal Expansion Properties
Alloy Grade 20°C-100°C 20°C-300°C 20°C-500°C
4J29 Kovar Alloy 4.6×10⁻⁶ /°C 5.5×10⁻⁶ /°C 6.2×10⁻⁶ /°C
Mechanical Properties
Alloy Grade 4J29 Kovar Alloy
Density (g/cm³) 8.2
Tensile Strength (MPa) 600-700
Yield Strength (MPa) 300-400
Hardness (HV) 200-250
Electrical Properties
Alloy Grade 4J29 Kovar Alloy
Electrical Resistivity (10⁻⁶ Ω·cm) 50
Thermal Conductivity (W/m·K) 16-18
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