Ojas Pipes and Tubes, a reputable manufacturer and supplier located in Kolkata, India, takes pride in providing top-notch Invar Bars and Rods tailored for the precision engineering sector. Renowned for their remarkable dimensional stability and minimal thermal expansion, these Invar products are crafted from a high-quality nickel-iron alloy. At Ojas, we guarantee that every item meets rigorous international standards, ensuring consistent mechanical properties, an excellent finish, and custom sizes to fit specialized needs. We cater to industries such as aerospace, electronics, and tooling, with a steadfast commitment to quality, reliability, and timely delivery both in India and around the globe.
Composition & Mechanical Properties (90 Words): Invar Bars and Rods primarily consist of iron (64%) and nickel (36%), resulting in an exceptionally low coefficient of thermal expansion. This nickel-iron alloy maintains high dimensional stability across various temperatures. Typically, Invar boasts a tensile strength of about 490 MPa, a yield strength of 275 MPa, and an elongation of 30%. Its density is roughly 8.1 g/cm³. Thanks to its remarkable thermal expansion characteristics and solid mechanical strength, Invar is perfect for high-precision tools, instruments, and other essential components.
| 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 industries where maintaining dimensional precision is crucial, even with temperature changes. They are commonly applied in aerospace instrumentation, scientific devices, precision measuring tools, cryogenic equipment, and high-accuracy mechanical components. These rods also play a role in bimetallic thermostats, optical and laser systems, and clocks. Their unique ability to minimize thermal expansion makes them ideal for structural applications that require stable dimensions under thermal stress. Ojas Pipes and Tubes provides Invar bars and rods that fulfill the strict demands of engineers and designers in high-performance settings, ensuring accuracy and reliability.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Rupal Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Delhi, India
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