Invar Bar and Rod

Nimish Metals is a respected manufacturer and supplier located in Safat, Kuwait, and supplies a variety of high-quality metals. Their motto is quality above all else; they offer all sorts of material, including Invar bars and rods, well known for having low thermal expansion and very accurate. Invar has a large following in the areas of aerospace, electronics, and precision engineering for applications where very little expansion due to thermal change is important. Nimish Metals assures to provide high quality and performance of the products manufactured; they guarantee delivery of solutions as per the variety of requirements to their clients with reliability. Its expertise and devotion make Nimish a trusted partner for the industry.

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Invar Round Bars

Invar Rectangular Bars

Invar Square Rods

What is Invar 36 Bar and Rods?

Mainly composed of iron (Fe) with high nickel content, typically at 36%, invar bars and rods have low thermal expansion as a result. Composition usually includes 36% nickel (Ni) and balance is iron, whereas traces of carbon (C), manganese (Mn), and silicon (Si) are also present. Mechanical properties include high strength and good dimensional stability at different temperatures. This material has a tensile strength ranging from 550 to 750 MPa, and elongation is 25%. Invar also has excellent fatigue resistance, as well as good machinability, which is ideal for applications requiring precision instruments and temperature-sensitive applications.

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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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Frequently Asked Questions (FAQ)

Are there specific welding consumables for Invar Bar ?

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.

Can Invar Bar and Rod Be Welded?

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.

Are Invar Rod Susceptible To Galvanic Corrosion?

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 Bar and Rod Uses

Invar bar and rods are a type of alloy of iron and nickel, widely used for applications requiring minimum thermal expansion. The reason for it is due to the uniqueness of its property, having a very low coefficient of thermal expansion (CTE). It is ideal in the application of precision instruments such as clocks, watches, and measuring devices. This element is also widely applied in aerospace and electronics as the components would require maintaining absolute dimensions in oscillating temperatures: it is part of satellites, lasers, and structural elements for various scientific instruments. Besides, in manufacturing molds and tools, under changing temperatures dimensional stability will be required; Invar satisfies such requirements well.

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