Special Alloys
Rely on PML Invar 36 for exceptional dimensional stability across a wide temperature range, ensuring near-zero thermal expansion for high-precision aerospace, optical, and cryogenic applications.
Engineered for absolute dimensional integrity, Invar 36 delivers a near-zero coefficient of thermal expansion.
INVAR 36 ingots are produced using Vacuum Induction Melting (VIM) to ensure chemical purity and structural integrity.
Alloy chemistry and ingot specifications are finalized as per application requirements.
As per customer requirements, mould design carried out and planned for charge preparation, charge sequences in VIM furnace. Careful selection of raw materials are the prime factor to achieve specified chemistry of an alloy.
Virgin elements are charged into the VIM furnace either in air or under vacuum, with precise adjustments made for trace element additions during melting.
The melt is poured under vacuum into precision-engineered molds using an automatic tilting mechanism for defect-free solidification.
Post-casting processes include surface treatment, cropping, and preparation of ingots for downstream processing.
Every batch is tested for chemical composition by Spark- OES / wet analysis / Gas analysis, and physical compliance as per customer specification before secure packaging.
Chemical Composition (Typical)
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon | 0.00 | 0.10 |
| Silicon | 0.00 | 0.35 |
| Manganese | 0.00 | 0.50 |
| Phosphorus | 0.00 | 0.025 |
| Sulfur | 0.00 | 0.025 |
| Nickel | 35.00 | 37.00 |
| Chromium | 0.00 | 0.50 |
| Copper | 0.00 | 0.50 |
| Iron | Balance | Balance |
| Impurity | Max (ppm) | PML Typical |
|---|---|---|
| Nitrogen | 100 | <50 ppm |
| Oxygen | 100 | <25 ppm |
Ensuring material integrity with 100% PMI testing via our precise XRF analyser.
| Property | As-Cast Value | After Heat Treatment |
|---|---|---|
| Hardness | 149 VHN | - |
| Ultimate Tensile Strength (UTS) | 505.0 MPa | - |
| Yield Strength (YS) | 200 - 400MPa | - |
| Young’s Modulus (E) | - | |
| Elongation at Break | - | - |
| Reduction of Area | - | - |
INVAR 36 is renowned for its exceptionally low coefficient of thermal expansion, making it ideal for applications requiring dimensional stability over wide temperature ranges.
| Input : Batch size | Output | Alloying Elements | Chemistry tolerance | Impurities Max |
|---|---|---|---|---|
| 30 kgs to 600 Kgs | Ingot of required shape as per customers requirement | Cr, Ni, Mn | +/- 0.5 % for Higher level % (Above 2 digit) and +/- 0.3 % for lower level % (Single digit) | Oxygen < 25ppm Hydrogen < 3ppm Nitrogen < 50ppm All other impurities < 50 ppm |
Due to its dimensional stability and thermal reliability, INVAR 36 is widely used in:
1
2
3
4
5
With over six decades of expertise, PML delivers high-performance component technologies and precision solutions trusted across critical industries.
ISO 45001
Occupational Health and Safety (OH&S) management systems
ISO 14001
Environmental Management Systems (EMS)
ISO 9001
Quality Management Systems (QMS)
IATF 16949
International Standard for Automotive Management Systems
AS 9100
Aerospace Quality Management System (QMS)
Depend on PML Monel 400 alloy for outstanding corrosion resistance and durability in marine, aerospace, and harsh chemical environments.
Depend on PML Tribaloy T400 for exceptional wear resistance and corrosion protection in highly demanding applications.
Premium Cobalt-Chromium-Molybdenum alloys from PML-engineered for strength, wear resistance, and biocompatibility in critical medical and high-temperature applications.
Rely on Stellite 6 Alloy superalloy for exceptional heat and corrosion resistance across demanding environments.
Depend on PML Monel 400 alloy for outstanding corrosion resistance and durability in marine, aerospace, and harsh chemical environments.
Depend on PML Tribaloy T400 for exceptional wear resistance and corrosion protection in highly demanding applications.
Premium Cobalt-Chromium-Molybdenum alloys from PML-engineered for strength, wear resistance, and biocompatibility in critical medical and high-temperature applications.
Rely on Stellite 6 Alloy superalloy for exceptional heat and corrosion resistance across demanding environments.
Pioneering cutting-edge technology to develop reliable, high-performance magnetic components and engineering solutions.
