Invar Bar and Rod

George Metals, headquartered in Houston, USA, is a well-established maker and supplier of Invar Bars and Rods that supply high-precision nickel–iron alloy products that are tailored for utmost dimensional stability across temperature fluctuations. George Metals’ Invar bars and rods, produced according to demanding ASTM F1684 and UNS K93600 specifications, are perfect for uses necessitating low thermal expansion. Recognized for superb quality control, close tolerances, and quick customer response, the company caters to aerospace, electronics, cryogenics, and precision tooling industries. George Metals provides custom size, quick shipment, and expert advice for customers requiring high-performance, low-expansion alloy solutions.

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What is Invar 36 Bar and Rods?

Invar Bars and Rods consist mainly of about 64% iron and 36% nickel, which imparts to them an incredibly low coefficient of thermal expansion—usually about 1.2 x 10⁻⁶/°C in the temperature range 20–100°C. This renders Invar to be among the most dimensionally stable available alloys. It has tensile strength of around 490–620 MPa, yield strength of around 240–350 MPa, and elongation of 25–35%. The alloy also possesses fine machinability, is non-magnetic at temperatures below, and retains dimensional stability even in varying thermal conditions. The density of Invar is approximately 8.1 g/cm³, and it can be annealed for enhancing ductility for shaping operations.

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Invar Bar and Rod Specification

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

Chemical Compositions of Invar Bar

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

Invar Bar and Rod Mechanical Properties

Tensile Strength	Yield Strength (0.2%Offset)	Elongation
Psi – 71,000 , MPa – 490	Psi – 35,000 , MPa – 240	42 %

Equivalent Grades of Invar Bar

STANDARD	WERKSTOFF NR.	UNS
Invar 36	1.3912	K93600

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Invar Bar and Rod Types

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Invar Bar and Rod Uses

Invar Bars and Rods find extensive application in industries where there is a need for least thermal expansion for dimensional stability. In aerospace and satellite technologies, Invar Bars and Rods find application in structural frameworks, measuring instruments, and optical support structures. In electronics, Invar plays an imperative role in CRT shadow masks, measuring instruments, and semiconductor fabrication machinery. Invar components are used in cryogenic systems to ensure stable operation under low-temperature conditions. It is also utilized in scientific equipment, laser technology, clocks, seismic sensors, and tooling for the manufacturing of composite parts. Invar provides precision and reliability in high-precision applications in a wide range of, temperature-sensitive industries.

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