Heat Treatment


Heat treatment services for Knifemakers and Bladesmiths

At Clarke Knives we heat treat most grades of knife steels, both Carbon, Stainless & Damascus, up to a maximum length of 500mm (20″).  We cannot heat treat High Speed Steels (M2, M42 etc)

We currently run our heat treatment 1 day per week, either Wednesday or Thursday depending on other workload factors at the forge

All heat treatment is effected from a digitally controlled furnace and blades are quenched in our own hybrid system which is a combination of an appropriate mineral quench oil and a quench press designed to virtually eliminate distortion in the blade

We do not work with a protective atmosphere but blades are encased in stainless steel tool wrap to reduce decarbutisation and minimise scaling. All blades are sand blast cleaned prior to dispatch

We offer a tang softening service for hidden tang blades if required

Carbon Steel blades are tempered once and Stainless Steel blades are tempered twice unless otherwise requested. Some carbon steels will automatically be treated (and charged for) as Stainless Steel due to their high alloy content and material specific heat treatment requirements, eg D2, D3, D6

We do not have cryogenic facilities. Stainless Steel blades are oil quenched and then cooled to -25 Celcius for a minimun of 1 hour and our hardening procedures for Stainless Steel blades are optimised to give best results with this level of cooling. We feel that more severe cryogenic treatments for Stainless Steel are only really necessary for air or vacuum quench hardening processes.

All blades are hardness tested on the tang and a test certificate will be sent with the blades. Testing will be prior to tang softening if this is requested.

It is important that you download our Heat Treatment Request Information Sheet (below), complete it, sign it and include it with your blades. Heat Treatment WILL NOT be scheduled without it. When signing it you will also be agreeing that you have read and accept our terms and conditions which can be seen by clicking on the appropriate button.

If you have any concerns or queries please ring or email Graham but please read our H/T FAQ’s first by clicking on the button below.