Mastering Precision: ZYTC Alloy’s ASTM F1684 Invar 36 Bar Exported to Singapore
In a significant milestone for our export capabilities, ZYTC Alloy has successfully delivered a batch of Invar 36 bars to Singapore, manufactured under the stringent ASTM F1684 standard with a specification of 80mm diameter. This achievement underscores our commitment to providing globally trusted solutions for industries demanding extreme dimensional stability.
What is Invar 36?
Invar 36, also known as FeNi36 or Alloy 36, is a nickel-iron alloy renowned for its exceptionally low coefficient of thermal expansion (CTE)—approximately 1.8 × 10⁻⁶/°C between 20°C and 100°C. This "zero-expansion" property, termed the Invar Effect, arises from a unique magnetic interaction that counteracts thermal lattice expansion. With nickel content tightly controlled near 36%, this alloy maintains stability across critical temperature ranges, making it indispensable in precision applications.
Key Invar 36 Chemical Composition
| Element | Content (%) | Role |
|---|---|---|
| Nickel (Ni) | 35‒37 | Primary driver of low CTE |
| Iron (Fe) | Balance | Base material |
| Carbon (C) | ≤0.05 | Prevents embrittlement |
| Manganese (Mn) | ≤0.60 | Controls CTE drift |
| Silicon (Si) | ≤0.30 | Enhances processability |
| Sulfur (S), Phosphorus (P) | ≤0.025 | Minimizes hot-cracking |
Impurities are rigorously limited to ensure performance consistency.
Invar 36 Mechanical & Physical Properties
Invar 36 combines low expansion with robust mechanical behavior:
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Tensile Strength: 490‒590 MPa
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Yield Strength: 280‒350 MPa
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Elongation: 25‒45% (excellent ductility)
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Density: 8.11 g/cm³
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Thermal Conductivity: 10‒12 W/(m·K) (low)
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Operating Range: -100°C to 230°C (optimal CTE stability)
Beyond 230°C, its CTE gradually increases, but the alloy retains usefulness up to 400°C for non-critical expansions. Its low thermal conductivity and high toughness further support applications in volatile environments.
Invar 36 Applications: Where Precision Cannot Compromise
Invar 36 is vital across advanced sectors:
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Aerospace: Satellite structural components, composite molding tools for aircraft.
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Semiconductors: Lithography equipment, chip packaging substrates.
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Precision Instruments: Laser cavities, optical mounts, and geodetic survey baselines.
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Energy: LNG tank supports and cryogenic pipelines.
ZYTC Alloy’s Manufacturing Excellence
Our production of Invar 36 products—including bars, plates, strips, wires, capillaries, seamless tubes, and forgings—adheres to international standards (ASTM, EN, AMS) with uncompromising rigor:
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Standardized Processes: From vacuum induction melting (VIM) to controlled rolling and annealing, each step minimizes impurities and residual stresses.
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Procedural Integrity: All products undergo CTE verification, ultrasonic testing, and mechanical validation.
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Specialized Expertise: Tailored solutions for forms like thin-walled tubes (OD: 0.25–16mm) or custom forgings.
We pride ourselves on fast delivery cycles, competitive pricing, and uncompromising quality. Whether for a high-volume bar order or a niche capillary requirement, ZYTC Alloy delivers with precision.
Conclusion
As industries push the boundaries of accuracy and reliability, Invar 36 remains a material of choice for zero-expansion challenges. ZYTC Alloy’s latest export milestone to Singapore exemplifies our capacity to meet global demand with agility and expertise. Explore our full Invar 36 product range and experience the synergy of advanced metallurgy and disciplined execution.
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