Invar 36 Round Bars are manufactured from premium nickel-iron alloy containing approximately 36% nickel, offering an exceptionally low coefficient of thermal expansion and outstanding dimensional stability. Manufactured in accordance with UNS K90600, UNS K90603, K93050, and Material No. 1.3912 specifications, these round bars are ideal for precision engineering, cryogenic equipment, aerospace tooling, measuring instruments, semiconductor equipment, optical devices, and scientific applications.
Stainless Steel Impex manufactures Invar 36 Round Bars using advanced production techniques and rigorous quality control procedures to ensure excellent mechanical strength, superior machinability, and precise dimensional accuracy. Available in round, flat, square, hexagonal, rectangular, hollow, and threaded profiles, our bars are supplied in hot rolled, cold drawn, forged, polished, and bright finishes to meet diverse industrial requirements. Every product is thoroughly inspected for chemical composition, mechanical properties, and dimensional tolerances before dispatch.
Grade: Invar 36 Round Bar
Square bar size : 4 to 100mm
Hollow Bar : 32mm OD x 16mm ID to 250mm OD x 200mm ID)
Hex Bar size : 2-100mm A/F
Rectangles Size : 33 x 30mm to 295 x 1066mm
Flat bar size : Thickness: 2 -100mm, Width: 10 to 500mm
Round bar size : Diameter: 3-~800mm
Surface: Bright, Hot Rolled Pickled, Cold Drawn, Sand Blasting Finished, Polished, Hairline
Tolerance : H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements
Technique : Hot Rolled, Cold Drawn, Cold Rolled, Forged Round Bar, Rod
Condition : Hardened & tempered, annealed
Finish : Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black
Processing : Bar cutting to 650mm
Invar 36 Round Bars Equivalent Grades
STANDARD: Invar 36
Material No: 1.3912
UNS: UNS-K90600 / K90603 / K-93050
EN Designation: Ni 36
Alloy: 36
Advantages
- Extremely low coefficient of thermal expansion provides outstanding dimensional stability in precision and cryogenic applications.
- Manufactured using premium nickel-iron alloy with strict dimensional tolerances, ensuring superior quality and reliable long-term performance.
- Every batch undergoes comprehensive chemical, mechanical, dimensional, and ultrasonic testing, maintaining a defect rate below 1%.
- Available in customized diameters, lengths, finishes, machining, cutting, polishing, and packaging according to customer requirements.

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