Our Invar 4J36 Nickel-Iron Alloy Plate is a go-to solution for aerospace and composite tooling applications where precision is non-negotiable. With 36% nickel and 64% iron, this alloy boasts a low coefficient of thermal expansion (CTE) of about 1.2 × 10⁻⁶/°C, meaning it barely budges when temperatures shift. That’s why it’s a favorite for projects that demand rock-solid dimensional stability, like aircraft components or high-precision molds.
We craft Invar 4J36 with meticulous heat treatments, including annealing and stabilization, to lock in its low-expansion properties. It’s magnetic below its Curie point (230°C) and stays structurally sound across a wide temperature range (-50°C to 100°C). Available in plates, sheets, and custom forms, our 4J36 is tailored to fit your needs, whether you’re building satellite frames or composite tooling for aerospace manufacturing.
The precision alloy market, including Invar 4J36, is on an upward trajectory, driven by aerospace and advanced manufacturing demands. With global aerospace spending projected to grow, the need for low-expansion materials like 4J36 is stronger than ever. Composite tooling, in particular, is seeing a surge as industries aim for lighter, stronger components. Trends like automation and 3D printing are also shaping the market, pushing for alloys that can handle complex geometries without losing precision.
Challenges include machining difficulties and the need for cost-effective production. We’re ahead of the curve, using state-of-the-art processing to minimize waste and maximize efficiency. Sustainability is another focus—our streamlined production reduces energy use while maintaining top quality. Invar 4J36’s versatility makes it a staple in aerospace, electronics, and optical systems, where even slight thermal expansion can derail performance.
| Elements | 4J29 | 4J36 | |
| Carbon (C) | Not greater than | 0.03 | 0.05 |
| Sulfur (S) | 0.02 | 0.02 | |
| Phosphorus (P) | 0.02 | 0.02 | |
| Manganese (Mn) | ≤0.50 | 0.20-0.60 | |
| Silicon (Si) | ≤0.30 | ≤0.30 | |
| Nickel (Ni) | 28.5-29.5 | 35.0-37.0 | |
| Chromium (Cr) | - | - | |
| Cobalt (Co) | 16.8-17.8 | - | |
| Iron (Fe) | Rest | Rest | |
| Other Elements |
| Alloy Grade | 20°C-100°C | 20°C-300°C | 20°C-500°C |
| 4J36 Invar Alloy | 1.2×10⁻⁶ /°C | 2.5×10⁻⁶ /°C | - |
| 4J29 Kovar Alloy | 4.6×10⁻⁶ /°C | 5.5×10⁻⁶ /°C | 6.2×10⁻⁶ /°C |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Density (g/cm³) | 8.1 | 8.2 |
| Tensile Strength (MPa) | 500-600 | 600-700 |
| Yield Strength (MPa) | 250-350 | 300-400 |
| Hardness (HV) | 150-200 | 200-250 |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Electrical Resistivity (10⁻⁶ Ω·cm) | 80 | 50 |
| Thermal Conductivity (W/m·K) | 10-12 | 16-18 |
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Invar 4J36 is a superstar in aerospace, used for structural components like satellite frames and landing gear supports that need to stay precise under thermal stress. In composite tooling, it’s perfect for molds and fixtures, ensuring accurate layups for carbon fiber and other composites. Beyond aerospace, it’s a key player in optical systems, like laser mounts and telescope frames, where stability is everything.
Electronics and telecommunications also lean on 4J36 for things like microwave cavities and precision connectors that can’t afford to shift with temperature changes. In metrology, it’s used for gauges and standards that demand exact measurements. From cryogenic systems to high-precision manufacturing, our Invar 4J36 delivers reliability where it counts most.
Comparison Table
Parameter | Invar 4J36 | Super Invar (4J32) | Stainless Steel (AISI 316) |
|---|---|---|---|
Composition | 64% Fe, 36% Ni | 64% Fe, 31% Ni, 5% Co | Fe, 16% Cr, 10% Ni, 2% Mo |
CTE (20–100°C) | ~1.2 × 10⁻⁶/°C | ~0.63 × 10⁻⁶/°C | ~16 × 10⁻⁶/°C |
Thermal Stability Range | -50°C to 100°C | -60°C to 80°C | Wide range, less precise |
Density | 8.05 g/cm³ | 8.15 g/cm³ | 8.0 g/cm³ |
Yield Strength | 260 MPa | 276 MPa | 290 MPa |
Tensile Strength | 450 MPa | 483 MPa | 580 MPa |
Corrosion Resistance | Moderate, weak in chloride environments | Moderate, weak in chloride environments | Excellent, ideal for marine use |
Applications | Aerospace, composite tooling, optics | Precision instruments, aerospace | Marine, structural, chemical processing |
Our Invar 4J36 Nickel-Iron Alloy Plate sets the bar high. Unlike other suppliers, we’ve fine-tuned our heat treatment processes to deliver a consistently low CTE, ensuring your components stay precise in any environment. Our advanced machining tackles 4J36’s tough texture, giving you smooth, accurate parts without the usual headaches. Every batch meets ISO 9001 standards, so quality is never a question.
We offer 4J36 in various forms—plates, sheets, or custom cuts—to match your project’s specs. Our team of metallurgists is available 24/7 to support you, from design to delivery. We keep costs competitive without compromising quality, making your project both high-performing and budget-friendly. With years of expertise in low- Expansion Alloy s, we’re not just selling a product—we’re helping you build the future of precision engineering.
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About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications. For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
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FAQs
What is Invar 4J36 Nickel-Iron Alloy Plate?
A low-expansion nickel-iron alloy plate with 36% nickel, designed for applications requiring dimensional stability under temperature changes.Why choose Invar 4J36 for aerospace?
Its low coefficient of thermal expansion (CTE) ensures components stay precise in extreme temperature swings, ideal for aerospace structures.What are the main applications of Invar 4J36?
Aerospace components, composite tooling, precision instruments, and optical systems where thermal stability is critical.How does Invar 4J36 perform in extreme conditions?
It maintains stability from -50°C to 100°C, with a CTE of ~1.2 × 10⁻⁶/°C, perfect for demanding environments.Is Invar 4J36 difficult to machine?
Its sticky texture can be challenging, but our optimized machining processes ensure high precision and smooth finishes.What about corrosion resistance?
It offers moderate corrosion resistance, suitable for controlled environments but less ideal for harsh, chloride-rich settings.Which industries use Invar 4J36?
Aerospace, electronics, telecommunications, and metrology, where precision and minimal thermal expansion are essential.How do we ensure Invar 4J36 quality?
Through strict heat treatment, testing, and ISO 9001-certified processes to deliver consistent, high-performance alloy plates.
