Invar Bar and Rod

Neith Metals, located in Cairo, Egypt, stands out as a top manufacturer and supplier of high-quality Invar Bars and Rods. These products are celebrated for their remarkably low coefficient of thermal expansion and impressive dimensional stability. The company is committed to delivering premium nickel-iron alloy products that adhere to international standards, ensuring dependable performance in precision and temperature-sensitive applications. Thanks to cutting-edge manufacturing technology and rigorous quality control, Neith Metals provides Invar Bars and Rods that boast consistent dimensions, excellent mechanical properties, and long-lasting reliability. These products find their place in various industries, including aerospace, electronics, instrumentation, and precision engineering, where thermal stability and accuracy are paramount.

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Invar Round Bars

Invar Rectangular Bars

Invar Square Rods

What is Invar 36 Bar and Rods?

Invar Bars and Rods are primarily made up of about 36–42% nickel, with the remainder being iron, and they include trace elements to boost mechanical performance and stability. They showcase remarkable mechanical properties, such as tensile strength ranging from 500–700 MPa, high yield strength, and good ductility. Invar is known for its exceptional dimensional stability across different temperatures, thanks to its extremely low coefficient of thermal expansion. This characteristic makes it perfect for applications that require precise tolerances, minimal thermal deformation, and consistent structural integrity under thermal cycling and mechanical stress.

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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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Why Neith Metals?

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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 Bars and Rods are widely utilized in applications that require high thermal stability and precision. They’re often found in aerospace components, satellite structures, and aircraft instrumentation, where maintaining dimensional accuracy amid temperature fluctuations is crucial. In the electronics sector, they’re used in precision measuring devices, clock components, and temperature-sensitive assemblies. The optics and scientific fields also rely on Invar for telescope mounts, laboratory equipment, and precision instruments. Moreover, high-precision engineering applications, such as molds, jigs, and tooling, depend on Invar Bars and Rods for their reliability and performance.

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