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Technical Specifications
Product Overview
Metallurgical Characteristics
Invar Steel exhibits a unique face-centered cubic austenitic structure with approximately 36% nickel content, which creates the Invar effect - an anomalous thermal expansion behavior. The precise nickel-iron ratio results in magnetic compensation that minimizes thermal expansion between -80°C to +100°C, making it ideal for precision structural applications requiring dimensional stability.
Heat Treatment Process
MetalZenith employs controlled annealing at 830-870°C followed by slow cooling to optimize the microstructure and minimize internal stresses. Our specialized heat treatment process ensures uniform thermal expansion properties and enhanced dimensional stability throughout the material cross-section.
Advanced Manufacturing Process
Our production utilizes vacuum induction melting with precise composition control, followed by controlled rolling and annealing processes. MetalZenith's advanced quality control includes thermal expansion coefficient verification, dimensional stability testing, and comprehensive mechanical property evaluation to ensure consistent performance in structural applications.
Specialized Quality Testing
Comprehensive testing protocols include thermal expansion coefficient measurement across temperature ranges, welding performance evaluation for structural joints, forming capability assessment for complex geometries, fatigue strength testing under thermal cycling conditions, and atmospheric corrosion resistance evaluation for long-term structural integrity.
Structural Engineering Applications
For building structures, Invar Steel provides exceptional dimensional stability in expansion joints and precision frameworks. In bridge engineering, it ensures reliable performance in temperature-sensitive connections. Mechanical manufacturing benefits from its precision tooling capabilities, while vehicle manufacturing utilizes its dimensional stability in engine components. General engineering applications leverage its unique thermal properties for precision instruments and measurement devices.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Iron (Fe) | 63.0 - 65.0 |
| Nickel (Ni) | 35.0 - 37.0 |
| Carbon (C) | ≤ 0.05 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.20 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | ≤ 0.20 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | 275 - 345 |
| Tensile Strength (MPa) | 450 - 550 |
| Elongation (%) | ≥ 30 |
| Impact Energy at 20°C (J) | ≥ 40 |
| Hardness (HB) | 140 - 180 |
| Fatigue Strength (MPa) | 200 - 250 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 8.05 |
| Melting Point (°C) | 1425 - 1455 |
| Thermal Conductivity (W/m·K) | 10.5 |
| Thermal Expansion (×10??/K) | 1.2 - 1.6 |
| Elastic Modulus (GPa) | 140 - 150 |
| Electrical Resistivity (μΩ·cm) | 82 - 85 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Rods, Wire, Forgings |
| Thickness Range | 0.5 - 50mm |
| Width Range | 100 - 2000mm |
| Length Range | 1000 - 6000mm |
| Standards Compliance | ASTM F1684, AMS 5218, DIN 17745 |
| Heat Treatment Condition | Annealed or Stress Relieved |
| Surface Finish | Hot Rolled, Cold Rolled, Precision Ground |
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Our Advantages in Processing Invar Steel
Precision Vacuum Melting Technology
MetalZenith utilizes advanced vacuum induction melting with precise nickel-iron ratio control and controlled cooling processes to achieve optimal microstructural uniformity. Our specialized processing ensures consistent thermal expansion properties and superior dimensional stability throughout the material cross-section.
Comprehensive Thermal Stability Testing
Our quality assurance includes specialized thermal expansion coefficient testing, dimensional stability verification across temperature ranges, fatigue strength evaluation under thermal cycling, and comprehensive welding performance assessment to ensure structural integrity in precision applications.
Custom Precision Machining Services
MetalZenith provides specialized machining and fabrication services for Invar Steel components, including precision grinding, dimensional calibration, and custom forming. Our technical support team offers application-specific guidance for optimal performance in structural and precision engineering applications.
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