Hemi Metals, located in Hamilton, New Zealand, has built a solid reputation as a reliable manufacturer and supplier of top-notch Invar Bars and Rods. These products are celebrated for their outstanding dimensional stability and minimal thermal expansion. With a strong focus on precision engineering, cutting-edge production techniques, and rigorous quality control, Hemi Metals serves industries that require materials capable of maintaining accuracy even when temperatures fluctuate. They offer Invar Bars and Rods in a variety of sizes, finishes, and specifications to suit a wide range of project needs. Their dedication to reliability, performance, and customer satisfaction has established them as a go-to source for Invar products, both in New Zealand and beyond.
Invar Bars and Rods are primarily made from an iron-nickel alloy that contains around 36% nickel, which is what gives them their remarkably low thermal expansion. This material is not only ductile and tough but also maintains its dimensional stability even when temperatures change. With a typical yield strength of about 240 MPa and a tensile strength close to 490 MPa, Invar is well-suited for applications that demand precise measurements or stable structures, particularly in environments where temperature shifts could impact accuracy.
| 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.
These Invar Bars and Rods are extensively utilized in industries where minimal thermal expansion is crucial. They play a vital role in precision instruments, aerospace tooling, optical devices, and scientific equipment that must maintain accuracy despite temperature variations. Invar is also used in the production of measuring tapes, seismic creep gauges, and structural supports for delicate components. In the electronics and telecommunications fields, it’s found in components that require stable dimensions. Furthermore, Invar is applied in cryogenic engineering, laser systems, and composite tooling, where its exceptional stability ensures consistent performance and long-lasting reliability.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hemi Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Hamilton New Zealand
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