Invar 36 Bar and Rod

George Metals in Houston, USA, is a reputable manufacturer and supplier of Invar 36 Bars and Rods, offering high-quality nickel–iron alloy products that are custom-designed for use in ultra-low thermal expansion applications. These bars and rods are produced to ASTM F1684 and UNS K93600 specifications and find application in aerospace, cryogenics, electronics, and metrology where dimensional stability and precision are paramount. George Metals provides custom sizes, close tolerances, and technical support to produce the best material performance. Quick turnaround with quality check makes them a desirable supplier for industries of high precision on a global scale.

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Invar 36 Round Bars

Invar 36 Rectangular Bars

Invar 36 Square Rods

What is Invar 36 Bar and Rods?

Invar 36 Bars and Rods contain about 36% nickel and 64% iron, along with trace amounts of manganese, silicon, and carbon. This alloy provides Invar 36 with its characteristic property: a very low coefficient of thermal expansion—approximately 1.2 × 10⁻⁶/°C between 20°C and 100°C. The alloy has a tensile strength of approximately 490 MPa, yield strength of roughly 240 MPa, and elongation close to 40–42% in the annealed condition. It is very machinable, weldable, and has very good dimensional stability even at cryogenic temperatures. Invar 36 is also non-magnetic at low temperatures and resists deformation under thermal stress.

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Invar 36 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 36 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 36 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 36 Bar

STANDARD	WERKSTOFF NR.	UNS
Invar 36	1.3912	K93600

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Invar 36 Bar and Rod Types

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Invar 36 Bar and Rod Uses

Invar 36 Bars and Rods find application in precision-critical areas where resistance to temperature change is necessary. They are utilized in aerospace and cryogenic applications in satellite structures, fuel tanks, and piping systems that witness high thermal fluctuations. Electronics and telecommunications industries utilize Invar 36 in products such as shadow masks, semiconductor tooling, and lead frames. Metrology and optical applications use it for laser mounts, calibration equipment, and instrumentation that needs micron accuracy. It is also used in composite mold tools and scientific apparatuses where uniform dimensions and structural integrity have to be maintained across different temperatures.

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