Invar is one of the most fascinating alloys used in industries where dimensional accuracy is non-negotiable. Whether it is aerospace, instrumentation, defense components, or cryogenic systems, Invar stands out because of its exceptionally low thermal expansion. However, engineers and buyers often search for one key question:
Understanding What Makes Invar Unique
Standard Invar (also called Invar 36) is made of:
- Iron (Fe) – majority
- Nickel (Ni) – around 36%
This combination creates an alloy with extremely low expansion even when exposed to temperature changes. For precision applications, this stability is unmatched.
But the same composition also decides whether the alloy is magnetic.
So, Is Invar Magnetic? Complete Property Breakdown
It is a ferromagnetic alloy, meaning it is attracted to magnets and can be magnetized. The iron content in the alloy is responsible for this magnetic behavior.
However, Invar’s magnetism is not identical to regular carbon steel. It is more stable, predictable, and temperature-dependent, which is why engineers must understand the full property breakdown.
Why Does Invar Show Magnetism?
1. Ferromagnetic Structure
Invar is made of iron and nickel, and iron is naturally magnetic. This gives the alloy its base magnetic properties.
2. Curie Temperature Effect
Invar loses its magnetism above 230°C (its Curie temperature).
Below this point, its magnetic nature remains stable.
3. Alloying Influence
Nickel stabilizes the alloy but does not remove magnetism.
This is why Invar behaves differently from high-nickel, non-magnetic alloys like Inconel or Monel.
How Strong Is the Magnetism?
Invar is magnetic, but the strength is:
- Lower than carbon steel
- Stable over a wide temperature range
- Strong enough to respond to magnetic fields
- Consistent for scientific use
Because of this controlled magnetism, it’s used where both precision and predictable behavior are important.
Applications Where Magnetism Matters
1. Aerospace Structures
Satellite frames, precision mounts, cryogenic systems, and optical components rely on Invar because magnetic stability helps maintain dimensional accuracy.
2. Scientific & Lab Equipment
Invar is widely used in:
- Magnetic shields
- Laser components
- Interferometers
- Measuring tools
Dimensional stability + predictable magnetism = ideal for research.
3. Electronics & Sensor Systems
Invar is used where devices must withstand temperature changes without shifting properties.
4. Industrial Tooling & Molds
Mold frames, dies, and aerospace tooling use Invar for stable performance in environments where magnetic influence must remain steady.
Why Choosing the Right Invar Supplier Matters
While the above explains Is Invar Magnetic? Complete Property Breakdown. The next step is sourcing high-quality alloy material.
Plus Metals is one of India’s most trusted suppliers of premium Invar materials.
They supply:
- Invar 36 Sheets
- Invar 36 Plates
- Invar Rods & Bars
- Invar Strips, Coils & Custom Sizes
- Invar 42 & Other Expansion Alloys
Why Industries Choose Plus Metals
- 100% certified material
- Export-quality finishing
- Custom cutting available
- Fast delivery across India
- Expert support for matching grades to applications
If your engineering project requires stable magnetic properties and low thermal expansion, Plus Metals provides the right Invar solution at competitive pricing.
Buy Now & Enquire Today
Visit: www.plusmetals.in
Or request a quote for Invar sheets, plates, rods, or special sizes.
Your precision applications deserve precision material, and Metals delivers exactly that.
FAQs
1. Is Invar magnetic at normal temperature?
Yes. Invar remains magnetic at room temperature and loses magnetic strength only when heated above its Curie temperature.
2. Does Invar become non-magnetic?
It temporarily becomes non-magnetic above ~230°C but regains magnetism on cooling.
3. Is Invar suitable for uses where magnetic interference must be controlled?
Yes, Invar’s magnetism is predictable and stable, making it ideal for scientific tools and aerospace systems.
4. What are the advantages of Invar in precision engineering?
Low thermal expansion, stable magnetism, strength, and excellent dimensional reliability.
5. Where can I buy Invar 36 and Invar 42 in India?
From Plus Metals, a leading supplier of high-performance expansion alloys with nationwide delivery.