Special AlloysSheet/Plate
Description (English)
Coefficient of Thermal Expansion (CTE) 20 – 100°C (68 – 212°F)//CTE (ppm/°C)1.2 – 1.3 20 – 200°C (68 – 392°F)//CTE (ppm/°C)2.0 – 2.5 20 – 300°C (68 – 572°F)//CTE (ppm/°C)5.5 – 6.5 20 – 400°C (68 – 752°F)//CTE (ppm/°C)8.0 – 9.0 20 – 500°C (68 – 932°F)//CTE (ppm/°C)11.0 – 12.0
Size Range
- Thickness:0.5 mm – 100 mm (0.020" – 4") — up to 150 mm custom
- Width:500 mm – 1,500 mm (20" – 60") Length 1,000 mm – 3,000 mm (40" – 120")
- Length:1,000 mm – 3,000 mm (40" – 120")
Grade Specification
| System | Value |
|---|---|
| 🇺🇸 UNS | K93600 / K93601 |
| 🇺🇸 ASTM | F1684 (plate), AMS I-23011 |
| EN / DIN | 1.3912 |
| AFNOR | FeNi36 |
| 🇬🇧 BS | NILO 36 |
| 🇯🇵 JIS | — (supplied to ASTM) |
| 🇨🇳 GB | 4J36 (expansion alloy) |
| Trademarks | Invar®, Nilo®, Pernifer®, FeNi36 |
Chemical Composition
| Element | Value |
|---|---|
| Ni | 35.0 – 37.0 |
| C | ≤ 0.05 |
| Si | ≤ 0.30 |
| Mn | ≤ 0.60 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
| Cr | ≤ 0.25 |
| Co | ≤ 0.25 |
| Fe | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength Rm | 440 – 550 MPa (64 – 80 ksi) |
| 0.2% Yield Strength | 240 – 310 MPa (35 – 45 ksi) |
| Elongation A (50 mm) | 30 – 45% |
| Reduction in Area | 55 – 70% |
| Hardness | 125 – 160 HB |
| Impact KV2 (room temp) | 80 – 120 J |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | - | 8.05 g/cm³ (0.291 lb/in³) |
| Melting Point | - | ~1,430 °C (2,606 °F) |
| Modulus of Elasticity | - | 141 GPa (20.5 × 10⁶ psi) |
| Shear Modulus | - | 52 GPa |
| Poisson's Ratio | - | 0.29 |
| Thermal Conductivity (20°C) | - | 10.5 W/(m·K) |
| Specific Heat (20°C) | - | 0.515 J/(g·K) |
| Electrical Resistivity (20°C) | - | 0.82 μΩ·m |
| Curie Temperature | - | ~277 °C (531 °F) — above this, magnetic properties are lost and CTE increases |
| Magnetism | - | Ferromagnetic (below Curie temperature) |
Applications
- Precision Instruments & Metrology
- Aerospace & Defense
- Electronics & Semiconductors
- Cryogenic & LNG
- Industrial