George Metals, located in Houston, USA, is a reliable manufacturer and supplier of Invar 42 Bars and Rods, a unique iron-nickel alloy celebrated for its remarkably low coefficient of thermal expansion. Also referred to as Alloy 42 or UNS K94100, Invar 42 is crucial for precision applications where maintaining dimensional stability across temperature changes is vital. George Metals produces and supplies Invar 42 bars and rods in various sizes and tempers, adhering to standards like ASTM F1684. These bars find extensive use in aerospace, electronics, tooling, cryogenics, and telecommunication systems that demand exceptional thermal stability and machinability.
Invar 42 Bars and Rods from George Metals generally consist of 41–43% nickel, with the remainder being iron, along with trace amounts of carbon, manganese, and silicon. This alloy is specifically designed to exhibit a very low coefficient of thermal expansion (~1.5 x 10⁻⁶/°C) within the temperature range of 20°C to 200°C. Its mechanical properties include a tensile strength of approximately 450–620 MPa, yield strength around 275 MPa, and good ductility. Typically supplied in an annealed state, Invar 42 offers excellent machinability and forming capabilities while maintaining outstanding dimensional stability in environments sensitive to temperature changes.
| Standards : | ASTM F30, ASME SF30 |
| 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 | Cu | Mo |
| Invar 42 | 0.1 max | 0.6 max | 0.35 max | 0.025 max | Balance | 35.0 – 37.0 | 0.5 max | 0.025 max | 0.5 max | 0.5 max | 0.5 max |
| Yield Strength (0.2%Offset) | Tensile Strength | Elongation | Hardness |
| Ksi – 36 , MPa – 248 | Ksi – 71 , MPa – 490 | 40 % | 40 |
| STANDARD | WERKSTOFF NR. | UNS |
| Invar 42 | 1.3917 | K94100 |
George Metals’ Invar 42 Bars and Rods are extensively utilized in applications where minimal dimensional changes are essential due to temperature variations. They are commonly found in electronic components, lead frames, thermostat rods, precision instruments, measuring devices, and cryogenic vessels. In the aerospace sector, Invar 42 is perfect for composite tooling, satellite components, and optical devices. In the electronics field, it serves as a standard material for glass-to-metal seals and hermetic packaging. George Metals guarantees that each bar meets rigorous quality and flatness standards, making Invar 42 the go-to material for critical thermal control applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
George Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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