Dictionary – Sub Zero

Sub Zero treatments are used to complete the hardening process in particular grades of steel.

The component is cooled to less than -70C which increases the conversion rate of the microstructure of the steel to the hard phase known as martensite.

Additionally it is used to convert metastable regions to the hard form to prevent reversion to softer weakened structures at operating temperatures

Holts offer sub-zero processing as part of their integrated heat treatment services