Hardening of knife blades up to 33 cm

The material thickness at the edge should be at least 0,6mm for carbon steel, and 0,4mm for stainless steel.
For laminated steel, only grind down to 1mm.

Please clearly mark each blade (indicate steel type with a waterproof marker on the tang/handle) and additionally enclose a note with: address, order number, steel type, and which blade should be measured for individual HRC testing or the hardness certificate, if applicable.

We cannot test laminated steel with the HRC tester; where possible, we check the cutting layer using a file test to assess if it has reached a high hardness.

Note on the measuring point: For a correct Rockwell test, the measuring point must be metallically clean and flat. Therefore, we prepare the surface if necessary in the measuring area at the tang/handle junction by lightly removing scale or oxide layer. Measurements are only possible if the handle/tang provides enough area (min. 10x10mm) and does not have too irregular a thickness (e.g. with a forged tang).


Our heat treatment for knife blades up to 33 cm includes:

• Hardening
• Straightening service
• Cryogenic treatment at approx. -85°C
• Tempering

Carbon steel is hardened in the furnace without scale protection.
Stainless steel & PM steel are protected with argon in a protective gas process and air-quenched, resulting in only a very thin oxide layer.
Rusting laminated steel (carbon steel) is not cryogenically treated due to the increased risk of cracking.

During hardening, blades may warp; we attempt to straighten them, but in extremely rare cases the blade may break. We do not provide any warranty for warping or breakage during hardening.

For further information, please visit our website.