Description
Overview Of Invar36
Invar36 (also known as Invar 36 or Fe-Ni36) is a low expansion alloy powder primarily composed of iron and nickel, characterized by its exceptional stability in thermal expansion properties. This material is widely used in applications requiring precise dimensional stability over a wide temperature range, making it a critical component in various industrial and technological fields.
Powder Chemical Composition(wt,-%)
| Element | Content Range |
| Nickel (Ni) | 35.0% – 37.0% |
| Iron (Fe) | Balance |
| Cobalt (Co) | ≤ 0.50% |
| Carbon (C) | ≤ 0.05% |
| Silicon (Si) | ≤ 0.30% |
| Manganese (Mn) | ≤ 0.60% |
| Phosphorus (P) | ≤ 0.020% |
| Sulfur (S) | ≤ 0.020% |
Physical & Mechanical Properties
| Property | Value | Unit |
| Density | 8.1 | g/cm³ |
| Melting Point | 1430 – 1450 | °C |
| Thermal Expansion Coefficient (-250°C to +200°C) | ≈ 1.2 – 1.8 | ×10⁻⁶/°C |
| Mechanical Properties (Annealed State) | ||
| Tensile Strength | 490 – 680 | MPa |
| Yield Strength | ≥ 240 | MPa |
| Elongation at Break | 25% – 35% | % |
| Hardness (HB) | 130 – 180 | HB |
Notably low expansion coefficient, maintaining dimensional stability in extreme temperature environments.
Exhibits good ductility and moderate strength, suitable for machining and forming processes.
Key Features
● Ultra-Low Thermal Expansion: Ideal for components subjected to thermal cycling (e.g., electronics, optics).
● Corrosion Resistance: Resistant to oxidation and general corrosion in ambient conditions.
● Magnetic Properties: Exhibits low magnetism, suitable for applications requiring non-magnetic materials.
● Excellent Machinability: Easily fabricated into complex shapes via powder metallurgy techniques (e.g., sintering, injection molding).
Primary Applications
● Electronic Devices: Components for microwave circuits, hermetic seals, and precision connectors.
● Aerospace: Engine parts, sensors, and structural elements requiring thermal stability.
● Medical Equipment: MRI components, surgical instruments, and dental implants.
● Industrial Tools: Precision molds, measuring instruments, and cryogenic devices.
Invar36 metal powder offers a unique combination of low thermal expansion, mechanical reliability, and versatile processing capabilities, making it an essential material for high-precision applications across diverse industries. Its performance under thermal stress and excellent manufacturability ensure consistent performance in critical environments.
Notes:
1. The thermal expansion coefficient values are typical for the specified temperature range.
2. Mechanical properties may vary depending on heat treatment processes.
