Invar Bar and Rod

Welcome to Maduka Metals, your trusted partner in Abuja for premium industrial materials. We specialize in supplying high-quality Invar bar and rod, a unique alloy engineered for exceptional stability. In a climate of fluctuating temperatures, our products provide the reliability that Nigerian engineers and fabricators need to ensure their projects stand the test of time, offering peace of mind for critical applications where precision is non-negotiable.

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Invar Round Bars

Invar Rectangular Bars

Invar Square Rods

What is Invar 36 Bar and Rods?

Invar is a remarkable nickel-iron alloy, typically composed of 36% nickel, which gives it its defining characteristic: an extremely low coefficient of thermal expansion. This means it barely expands or contracts with changes in temperature. The material also boasts good tensile strength and excellent machinability, allowing it to be worked into precise components without losing its fundamental stability, making it both a strong and predictable engineering choice.

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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

The primary use of Invar bar and rod is in applications where dimensional stability is absolutely critical. You’ll find it essential in precision instruments, large-scale architectural frameworks, and molds for aerospace components. In Nigeria, it’s particularly valuable for surveying equipment, support structures for scientific apparatus, and specialized tooling, ensuring that measurements and alignments remain accurate despite the heat, making it a cornerstone for innovation and quality in demanding technical fields.

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