Luois Metals, a reputable manufacturer and supplier based in Houston, USA, specializes in high-quality Invar Bars and Rods. These products are celebrated for their outstanding dimensional stability and minimal thermal expansion. Crafted with precision and in line with international standards, Luois Metals’ bars and rods boast an excellent surface finish, precise dimensions, and long-lasting reliability. They are perfect for applications that demand precise thermal control, such as aerospace, precision instruments, electronics, scientific equipment, and glass-to-metal sealing, where consistent performance and resistance to temperature-induced deformation are crucial.
The composition of Invar Bars and Rods typically includes around 36–42% nickel, with the remainder being iron and carefully managed trace elements to enhance thermal stability and mechanical performance. This unique blend results in an extremely low coefficient of thermal expansion while still providing good tensile strength, ductility, and toughness. Mechanically, these materials show remarkable dimensional stability during thermal cycling and maintain their structural integrity in critical precision applications, ensuring dependable and consistent performance over time.
| 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 Bars and Rods find extensive use in aerospace structures, precision measuring instruments, optical devices, scientific apparatus, semiconductor equipment, and glass-to-metal seals. They are also utilized in temperature-sensitive assemblies, machinery prone to vibrations, and structural supports where minimal expansion or contraction is vital. Their combination of low thermal expansion, strength, and stability makes them an excellent choice for high-precision engineering applications. Luois Metals is committed to delivering Invar Bars and Rods that offer superior quality, long-term reliability, and consistent performance, making them the go-to material for industries that require dimensional stability under varying thermal conditions.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Louis 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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