Invar 36 Round Bar Supplier for Precision Thermal Stability Applications
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Invar 36 Round Bar Supplier is a highly specific industrial search because Invar 36 is not purchased like an ordinary stainless-steel or carbon-steel bar.
It is selected when dimensional stability during temperature changes is a critical engineering requirement.
Invar 36 is a nickel-iron alloy known for its exceptionally low coefficient of thermal expansion over a useful temperature range.
That characteristic makes it valuable in applications where even a small amount of thermal expansion can affect:
- Dimensional accuracy
- Alignment
- Calibration
- Tooling
- Optical performance
- Measurement
- Component positioning
For an engineer or procurement manager, the question is therefore not simply:
“What is the price of Invar 36?”
The more important question is:
“Can the material maintain the dimensional stability required by my application?”
Table of Contents
- What is Invar 36 Round Bar?
- Why is Invar 36 different from ordinary steel?
- What is UNS K93600?
- Invar 36 chemical composition
- Invar 36 thermal expansion
- Invar 36 coefficient of thermal expansion
- Invar 36 mechanical properties
- Invar 36 tensile strength
- Invar 36 yield strength
- Invar 36 density
- Invar 36 temperature stability
- Invar 36 precision engineering applications
- Invar 36 tooling applications
- Invar 36 aerospace applications
- Invar 36 optical applications
- Invar 36 electronic applications
- Invar 36 measuring equipment
- Invar 36 machining
- Invar 36 welding
- Invar 36 heat treatment and stress relief
- Invar 36 Round Bar sizes
- Invar 36 specifications
- Invar 36 testing and certification
- Invar 36 Round Bar price
- How to buy Invar 36 Round Bar
- Invar 36 Round Bar Supplier in Mumbai
- Frequently asked questions
- Request a quotation
- Conclusion
What is Invar 36 Round Bar?
Invar 36 Round Bar is a round-section product manufactured from Invar 36, a nickel-iron alloy engineered for extremely low thermal expansion.
The alloy is commonly associated with approximately 36% nickel, with iron making up the balance along with controlled minor elements.
Its most important characteristic is its unusually low thermal expansion compared with ordinary steels.
This makes Invar 36 particularly useful for precision components that must maintain dimensional accuracy when temperatures change.
Why is Invar 36 Different from Ordinary Steel?
Most materials expand when heated and contract when cooled.
That may not matter for a conventional structural component.
But consider a precision measuring system where a dimensional change of even a fraction of a millimetre can affect the final result.
Suddenly, thermal expansion becomes an engineering problem.
Invar 36 addresses this problem through its extremely low coefficient of thermal expansion.
This is why it is used in applications where temperature-induced dimensional movement must be minimized.
For technical background on low-expansion alloys, engineers can refer to Special Metals’ alloy information, which discusses Invar 36 and its low-expansion characteristics.
What is UNS K93600?
Invar 36 is commonly identified by the UNS designation:
UNS K93600
Buyers may encounter the material under several names:
- Invar 36
- Invar
- Alloy 36
- Nickel-Iron 36
- UNS K93600
- Low Expansion 36 Alloy
When placing an order, it is important to specify the exact grade and applicable specification.
This prevents confusion between Invar 36 and other nickel-iron low-expansion alloys.
Invar 36 Chemical Composition
The defining feature of Invar 36 is its nickel-iron composition.
Typical alloying elements include:
| Element | Typical Role |
|---|---|
| Nickel | Controls thermal expansion |
| Iron | Base alloy element |
| Carbon | Controlled residual element |
| Manganese | Processing and metallurgical control |
| Silicon | Controlled alloying element |
The actual limits depend on the applicable material specification.
For critical precision applications, the chemical analysis should be confirmed from the Material Test Certificate supplied with the material.
Invar 36 Thermal Expansion
The primary reason engineers select Invar 36 is its low thermal expansion.
A conventional steel component can change dimensions significantly when its operating temperature changes.
Invar 36 changes dimensions much less over its useful low-expansion temperature range.
This characteristic can be valuable for:
- Precision gauges
- Optical systems
- Measuring equipment
- Tooling
- Electronic components
- Aerospace structures
- Precision fixtures
However, the actual coefficient of thermal expansion depends on temperature and material condition.
Therefore, engineers should use the applicable technical data for their specific temperature range.
Invar 36 Coefficient of Thermal Expansion
The coefficient of thermal expansion, commonly abbreviated as CTE, describes how much a material changes dimension with temperature.
For Invar 36, the CTE is exceptionally low compared with ordinary steels over the relevant temperature range.
That is the property that gives Invar 36 its value in precision engineering.
In a component where thermal movement must be minimized, even a small CTE can make a major difference.
This is why Invar 36 frequently appears in engineering discussions involving:
dimensional stability + temperature variation + precision.
Invar 36 Mechanical Properties
Although thermal expansion is the main reason for selecting Invar 36, engineers must also evaluate its mechanical characteristics.
Relevant properties include:
- Tensile strength
- Yield strength
- Elongation
- Hardness
- Elastic modulus
- Density
- Thermal expansion
Mechanical properties vary depending on:
- Product form
- Heat treatment
- Cold working
- Material condition
The exact values should therefore be confirmed against the material certificate and governing specification.
Invar 36 Tensile Strength
Invar 36 provides useful mechanical strength for precision components.
However, it should not be selected purely on the basis of tensile strength.
Its primary advantage is dimensional stability under temperature changes.
Where a component requires exceptionally high mechanical strength, another alloy may be more appropriate.
Where dimensional stability is the dominant requirement, Invar 36 can become a much more attractive engineering material.
Invar 36 Yield Strength
Yield strength indicates the stress at which permanent deformation begins.
For precision components, maintaining dimensional accuracy is often more important than simply achieving maximum strength.
The required Invar 36 condition should therefore be selected according to:
- Applied stress
- Temperature
- Geometry
- Required dimensional stability
- Manufacturing process
For critical applications, mechanical test values should be verified from the supplied MTC.
Invar 36 Density
Invar 36 has a relatively high density compared with many conventional steels because of its significant nickel content.
This should be considered when:
- Weight is restricted
- Components are large
- Aerospace structures are involved
- Moving assemblies are being designed
The designer should therefore evaluate both the thermal and weight requirements of the application.
Invar 36 Temperature Stability
The value of Invar 36 becomes particularly apparent when the temperature of a component is not constant.
Applications may involve:
- Day/night temperature cycles
- Manufacturing temperature variations
- Equipment heating
- Cooling
- Controlled laboratory environments
- Cryogenic or low-temperature systems
The operating temperature range must be considered carefully because the low-expansion behaviour of Invar is temperature dependent.
Invar 36 Precision Engineering Applications
Invar 36 is widely associated with precision engineering.
Potential applications include:
- Precision fixtures
- Reference components
- Dimensional standards
- Gauges
- Measuring equipment
- Optical mounts
- Tooling
- Electronic assemblies
When dimensional movement caused by temperature could affect the performance of the assembly, low-expansion alloys become particularly useful.
Invar 36 Tooling Applications
Tooling is one area where thermal expansion can become a practical manufacturing problem.
A tool manufactured from a conventional material may change dimensions as its temperature changes.
This can affect:
- Alignment
- Part dimensions
- Tool-to-part positioning
- Repeatability
Invar 36 can be considered for selected precision tooling and fixtures where dimensional stability is important.
Invar 36 Aerospace Applications
Aerospace engineering frequently involves components that must remain dimensionally stable across changing temperatures.
Invar 36 may therefore be considered for selected:
- Precision structures
- Tooling
- Fixtures
- Instrument components
- Specialized aerospace assemblies
For aerospace procurement, the exact specification, traceability and certification requirements should be established before material purchase.
Invar 36 Optical Applications
Optical systems can be highly sensitive to dimensional movement.
A slight change in the position of an optical component can influence:
- Alignment
- Focus
- Calibration
- Image quality
- Measurement accuracy
Invar 36 can therefore be used for selected optical mounts, structures and precision components where low thermal expansion is beneficial.
Invar 36 Electronic Applications
Invar 36 is also relevant to selected electronic and electrical applications where differences in thermal expansion between materials need to be controlled.
This is especially important when materials are bonded or assembled together and experience repeated temperature changes.
The objective is to reduce excessive dimensional movement and thermal mismatch.
Invar 36 Measuring Equipment
Precision measurement requires dimensional stability.
A measuring instrument can lose accuracy if its critical components expand and contract significantly with temperature.
Invar 36 can be used in selected:
- Gauges
- Reference components
- Measurement fixtures
- Precision instruments
- Dimensional standards
The alloy is therefore particularly interesting to manufacturers involved in metrology and precision engineering.
Invar 36 Machining
Invar 36 can be machined using conventional metalworking techniques, but its machining behaviour should be understood before production.
Important considerations include:
- Cutting speed
- Feed rate
- Tool geometry
- Coolant
- Workholding
- Heat generation
Because the material is commonly used for precision components, machining strategy should also account for dimensional stability after machining.
Stress relief may be considered where component accuracy is critical.
Invar 36 Welding
Invar 36 can be welded using suitable procedures.
However, welding introduces localized heating and cooling.
For a low-expansion precision component, that thermal cycle can influence:
- Residual stress
- Dimensional stability
- Distortion
- Final geometry
For critical applications, welding procedures should therefore be developed specifically for the component and required dimensional tolerances.
Invar 36 Heat Treatment and Stress Relief
Heat treatment and stress relief can be important considerations when manufacturing precision Invar 36 components.
Machining can introduce residual stresses into a component.
If the component is subsequently exposed to temperature changes, those stresses can contribute to dimensional movement.
For high-precision parts, the manufacturing sequence should therefore be planned around:
rough machining → stress relief → finish machining → dimensional inspection
The exact treatment should be established according to the applicable specification and engineering requirement.
Invar 36 Round Bar Sizes
Invar 36 Round Bar may be required in different diameters and lengths depending on the application.
A purchase enquiry should clearly mention:
| Requirement | Example |
|---|---|
| Grade | Invar 36 |
| UNS | K93600 |
| Diameter | 30 mm |
| Length | 3000 mm |
| Condition | As required |
| Finish | Bright / Ground |
| Quantity | 100 kg |
| Testing | Required |
| MTC | Required |
For precision applications, dimensional tolerance should be specified clearly.
Invar 36 Specifications
Depending on the product and application, buyers may encounter specifications such as:
- Invar 36
- UNS K93600
- ASTM specifications applicable to low-expansion nickel-iron alloys
- Aerospace or customer-specific material specifications
Do not assume that two Invar 36 bars are automatically interchangeable.
Always confirm:
Grade + specification + condition + dimensions + certification.
Invar 36 Testing and Certification
For industrial applications, buyers may request:
- Chemical composition
- Tensile testing
- Yield strength
- Elongation
- Hardness
- Dimensional inspection
- Thermal expansion data
- PMI
- Heat number traceability
- Material Test Certificate
- Third-party inspection
For precision or aerospace applications, additional documentation may be required.
The certification requirement should be established before the purchase order is released.
Invar 36 Round Bar Price
Invar 36 Round Bar Price depends on considerably more than weight.
Important factors include:
- Diameter
- Length
- Quantity
- Material condition
- Finish
- Tolerance
- Specification
- Testing
- Certification
- Availability
Because Invar 36 is a specialty nickel-iron alloy, its pricing can differ substantially from ordinary carbon steel or stainless-steel bars.
For an accurate quotation, provide the complete specification.
How to Buy Invar 36 Round Bar
Before requesting a quotation, prepare these details:
Material: Invar 36
UNS: K93600
Diameter: ______ mm
Length: ______ mm
Quantity: ______ kg
Condition: ______
Finish: ______
Tolerance: ______
Specification: ______
Testing: ______
Certificate: ______
Application: ______
This makes it easier for the supplier to identify the correct material and prepare a meaningful quotation.
Invar 36 Round Bar Supplier in Mumbai
If you are searching for an Invar 36 Round Bar Supplier in Mumbai, the most important consideration is not simply whether the supplier has a bar with “Invar” written on the quotation.
For precision applications, verify:
- Correct UNS designation
- Material specification
- Chemical composition
- Mechanical properties
- Thermal expansion requirements
- Dimensions
- Tolerance
- Heat number
- Certification
- Delivery schedule
Manan Steel & Metals supplies specialty alloys and industrial steel products for engineering and procurement requirements.
If you require Invar 36 Round Bar, Invar 36 Rod, UNS K93600 or another low-expansion alloy, send your required size, quantity and specification for availability and quotation.
Frequently Asked Questions
What is Invar 36 Round Bar?
Invar 36 Round Bar is a nickel-iron alloy bar known primarily for its exceptionally low coefficient of thermal expansion.
What is the UNS number of Invar 36?
The commonly used UNS designation for Invar 36 is UNS K93600.
Why is Invar 36 used?
It is used when dimensional stability during temperature changes is important, particularly in precision tooling, measuring equipment, optical systems and specialized engineering applications.
What is the CTE of Invar 36?
Invar 36 has an exceptionally low coefficient of thermal expansion compared with conventional steels. The actual CTE varies with temperature and material condition and should be taken from the applicable technical data.
Is Invar 36 stainless steel?
No. Invar 36 is primarily a nickel-iron low-expansion alloy, not a conventional stainless-steel grade.
Is Invar 36 suitable for machining?
Yes. Invar 36 can be machined, although precision machining requires careful control of cutting conditions and residual stress.
Is Invar 36 used in aerospace?
Yes, selected aerospace tooling, structures and precision components can use low-expansion Invar alloys where dimensional stability is important.
What is Invar 36 Round Bar price?
Price depends on diameter, quantity, condition, specification, tolerance, certification and availability. A specific quotation requires the complete requirement.
Where can I buy Invar 36 Round Bar in Mumbai?
Contact Manan Steel & Metals with your required diameter, length, quantity and specification for availability and quotation.
Request a Quotation
Looking for an Invar 36 Round Bar Supplier in Mumbai?
Send your requirement:
Material: Invar 36
UNS: K93600
Diameter: ______ mm
Length: ______ mm
Quantity: ______ kg
Condition: ______
Finish: ______
Tolerance: ______
Specification: ______
Testing: ______
Certificate: ______
Application: ______
Phone: 7977369869
Email: manansteel@gmail.com
Manan Steel & Metals
Shop No. 2, Hira Building
97 Khetwadi Main Road (Nanubhai Desai Road)
Girgaon, Mumbai – 400004
Maharashtra, India
Phone: 7977369869
Email: manansteel@gmail.com
Conclusion
Invar 36 is a specialty material selected for a very specific engineering problem: controlling dimensional change caused by temperature.
Its exceptionally low thermal expansion makes it valuable for precision tooling, gauges, optical systems, measuring equipment, aerospace applications and other assemblies where dimensional stability matters.
For buyers searching for an Invar 36 Round Bar Supplier, the correct purchasing approach is to specify the grade, UNS designation, dimensions, condition, tolerance, applicable specification and certification requirements.
If your application depends on maintaining dimensional accuracy through temperature changes, send your requirement to Manan Steel & Metals for an industrial quotation.
Special Metals – Invar 36 Technical Information
Link 2 — ASTM International
For projects requiring ASTM material specifications, engineers should verify the applicable requirement through ASTM International before finalizing the purchase specification.
Link 3 — BSI
Buyers working with British or legacy EN/BS material designations can verify applicable standards through British Standards Institution.
Link 4 — ISO
Where an international standards requirement applies, the applicable documentation can be checked through ISO Standards.
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