4J36 Invar Alloy Specification
Ultra-Low Expansion Nickel-Iron Alloy for Precision Applications
Product Specification
| Standard | GB/T 15018 (China), ASTM F1684 (USA) |
| Material Designation | 4J36 (Fe-36Ni), Invar, Ni36 |
| Tolerance | h7-h11 (on request) |
| Melt Method | Vacuum Induction Melting (VIM) |
| Available Forms & Sizes | Plate: 0.1mm – 35mm thick Bar: Φ3mm – Φ250mm Tube: OD 6mm – 120mm Wire: Φ0.05mm – Φ5.0mm |
Chemical Composition
| Element | Content (%) | Element | Content (%) |
| Nickel (Ni) | 35.0 – 37.0 | Iron (Fe) | Balance |
| Carbon (C) | ≤ 0.05 | Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.30 | Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.020 | Cobalt (Co) | ≤ 1.00 |
Physical Properties
- Density: 8.1 g/cm³
- CTE (20-100°C): 1.2-1.8×10⁻⁶/K
- Melting Point: 1430°C
- Curie Temperature: 230°C
- Thermal Conductivity: 10-15 W/(m·K)
Mechanical Properties
- Tensile Strength: 450-650 MPa
- Yield Strength: 300-450 MPa
- Elongation: ≥30%
- Hardness: 140-200 HB
Applications
- Satellite structural components and optical mounts
- Semiconductor manufacturing equipment
- Precision measurement instruments
- Laser alignment systems
- Cryogenic containers and LNG systems
- Chronometer components
