Vacuum hardening is a specialized heat treatment process used to enhance the mechanical properties of metallic materials. In this method, the workpiece is placed inside a sealed chamber, from which air and gases are removed, creating a vacuum environment. This absence of air prevents oxidation and contamination of the metal during heating. The workpiece is then heated to a specific temperature, typically above its critical transformation temperature, and held at that temperature for a predetermined time. Afterward, it is rapidly cooled in the vacuum chamber, using various cooling mediums like nitrogen or helium. This rapid quenching results in the formation of a hardened microstructure with improved strength, hardness, and wear resistance. Vacuum hardening is favored for its precision and uniformity, making it suitable for intricate and critical components in aerospace, automotive, and tooling industries. It offers superior control over the hardening process, ensuring consistent and reliable results.

Sub Zero Treatment has all the power to enhance the material properties of your components. Through controlled sub-zero temperatures, we achieve exceptional improvements in hardness, toughness, and wear resistance. Experience components that are not only stronger but also more resilient, capable of outperforming even the toughest challenges.

At Unitherm Engineers Limited, we take quality assurance earnestly, and our Metallurgy Labs in all three plants are at the forefront of ensuring the highest standards in heat treatment processes. Armed with testing equipment, our labs play a crucial role in monitoring and measuring metallurgical parameters precisely as per customer specifications.