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 label each blade, and include a note with: address, order number, steel specification as well as which blade, if any, should be measured for individual HRC testing or the hardness certificate.

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

Note on the measuring point: For a correct Rockwell test, the measuring point must be metallically clean and flat. We therefore prepare the surface as needed in the measuring area at the tang/handle transition by lightly removing scale or oxide layer. Measurements are only possible if the handle/tang has enough surface area (min. 10x10mm) and does not have an excessively irregular thickness (e.g., with a forged tang).


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

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

Carbon steel is hardened in the furnace without scale protection.
Stainless steel & PM steel are protected in an argon atmosphere and air-quenched, resulting in only a very thin oxide layer.
Rusting laminated steel (carbon steel) is not cryo 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 accept liability for warping or breakage during hardening.

For more information, please visit our website.