Vacuum Hardening
Vacuum hardening is a premium heat treatment process carried out entirely under high vacuum, eliminating any contact between the component and atmospheric oxygen or moisture during heating and soaking. The result is a bright, oxide-free, metallurgically clean surface with no decarburisation, no scaling, and no discolouration — combined with precisely controlled hardness and minimal distortion achieved through gas quenching.
Our high vacuum advantage
We operate high vacuum furnaces that achieve pressures in the range that completely eliminate surface reactions, ensuring a bright, clean finish on every component. This is particularly critical for high-value tooling, aerospace-grade alloys, and precision components where even minor surface contamination or decarburisation is unacceptable.
Why choose Vacuum Hardening?
Bright, clean surface
No oxidation, scaling, or decarburisation — components emerge bright
Minimal distortion
Uniform heating and controlled gas quench preserves precision geometry
Consistent hardness
Repeatable, tightly controlled hardness values across complex tool geometries
Premium tooling quality
Ideal for high-speed steels, tool steels, and stainless grades
Process specifications
| Furnace type | High vacuum |
| Quench medium | High-pressure gas (nitrogen) |
| Applicable materials | HSS, Tool steels (D2, H13, M2), Stainless, PM grades |
- D2
- H13
- M2
- HSS grades
- Stainless steels
Industries served
- Automobile
- Defence
- Oil & Gas
- General Engineering