Da Nang’s Chung Metal Manufacturer offers precision-crafted Invar Bars and Rods for severe applications that need little thermal expansion. Invar (nickel-iron alloy) is best designed for dimensional stability in varying temperatures. Manufactured within strict tolerances, our Invar bars fulfill global standards for performance in instrumentation, aerospace, and electronics. Perfect for metrology tools and cryogenic applications, our bars provide the best thermal stability. Chung Metal guarantees each rod is inspected for mechanical accuracy and composition, offering reliable solutions to scientific, defense, and industrial clients globally.
Invar is usually composed of ~64% iron and ~36% nickel. Its most characteristic attribute is its extreme thermal expansion coefficient (CTE ≈ 1.2 x10⁻⁶/°C between 20–100°C). Tensile strength is between 480 and 620 MPa, yield strength around 250 MPa, elongation approximately 30–35%. Density is approximately 8.1 g/cm³. The alloy is tough, machinable, and moderately ferromagnetic. It has good dimensional stability across a wide temperature range, for which it is suited in precision applications involving thermal cycling.
| Standards : | ASTM F1684, ASME SF1684 |
| Dimensions : | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Wire : | Thickness starting from 0.05mm |
| Round bar size : | Diameter: 3-~800mm |
| Hex Bar size : | 2-100mm A/F |
| Flat bar size : | Thickness: 2 -100mm / Width: 10 to 500mm |
| Square bar size : | 4 to 100mm |
| Rectangular Bars Size : | 33 x 30mm to 295 x 1066mm |
| Hollow Bar : | 32mm OD x 16mm ID to 250mm OD x 200mm ID |
| Tolerance : | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
| Finish : | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Grade | C | Mn | Si | S | Fe | Ni | Cr | P | Mo | Co |
| Invar 36 | 0.10 max | 0.06 max | 0.35 max | 0.025 max | Rem | 35-38 | 0.50 max | 0.025 max | 0.50 max | 1.0 max |
| Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Psi – 71,000 , MPa – 490 | Psi – 35,000 , MPa – 240 | 42 % |
| STANDARD | WERKSTOFF NR. | UNS |
| Invar 36 | 1.3912 | K93600 |
Yes, for Invar bar welding, specialized consumables like Invar welding rods, Invar electrodes, or Ni-based filler metals such as ERNi-1 or ERNiCrMo-3 are commonly used to ensure optimal bonding and minimize thermal expansion issues.
Yes, Invar bar and rod can be welded, typically using TIG or MIG welding techniques. However, it requires careful control of heat to avoid distortion due to its low expansion properties.
Invar rods, primarily composed of iron and nickel, are generally resistant to galvanic corrosion. However, when paired with more reactive metals, they may experience corrosion if exposed to electrolyte solutions.
Invar rods and bars have a wide range of applications in precision instruments, clock parts, radio/TV shadow masks, seismic detectors, measuring instruments, and cryogenic equipment. For its low thermal expansion, it’s the best choice for tooling, dies, molds, and structural parts subject to varying temperatures. Aerospace and satellite systems take advantage of Invar to keep parts aligned in space. Composite tooling for aircraft production also employs it. Its temperature coefficient stability in dimensions renders it invaluable in metrology and calibration laboratories.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Chung Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Da Nang, Vietnam
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