Product Details

Ice Hardened Blades
FRIODUR knives are ice-hardened to increase the blade’s corrosion-resistance, elasticity and toughness.
More about FriodurIce Hardened Blades

Ice Hardened Blades
The steel is heated to over 1000c then cooled very quickly to below 800c then slowly to room temperature to give each knife extra protection against corrosion and a toughness which increases resistance to wear. Tempering harmonises the molecular structure of the steel and removes tension from the material, creating exceptional flexibility which helps to prevent cracking of the blade.
Ice-hardening also helps to increase the hardness of the steel. This hardness enables the extremely sharp cutting edge to be retained, so that the knife will hold its sharp edge for longer before maintenance is needed.

Forging
With SIGMAFORGE, knives are fully forged from a single piece of steel as the basis for sharpness and strength.
More about SIGMAFORGEForging

Forging
During forging, the steel – or blank – for all SIGMAFORGE knives is only heated at the bolster. As a result, the quality and precisely balanced structure of the steel that makes up the rest of the knife – and critically – the blade, remains unaltered.
This in turn means SIGMAFORGE precision-forging is the first step in the manufacturing process that allows for outstanding hardness, cutting-edge retention and flexibility of ZWILLING knives.

Special Formula Steel
ZWILLING’s special formula steel is the very starting point for the production of high quality knives.
More about the steelSpecial Formula Steel

ZWILLING special formula steel is produced exclusively for ZWILLING and is made up of an exact ratio of carbon and chromium which provides the ideal balance of hardness and corrosion resistance.
This unique material composition combined with ZWILLING’s SIGMAFORGE and FRIODUR manufacturing produces an extremely durable knife with excellent corrosion-resistance and flexibility.
The steel has a Rockwell Hardness of approximately 57. This means that the cutting edge is stable and will retain its sharpness well. This level of hardness also has the benefit of ensuring the knife is easy to maintain with a set of steels, a pull-through sharpener or even a whetstone.
The quality of the steel structure also means that it is possible to repeatedly maintain and re-sharpen the cutting edge over the course of many years, meaning your knife can be kept as sharp as the day it was made.