Carbon steel
Opinel knife blades are made using steels with a high carbon content, which is what makes it possible to achieve the excellent hardness after heat treatment, guaranteeing the good strength of the cutting edge, resistance to wear and easy sharpening.
Carbon has a low resistance to corrosion caused by moisture, which means that certain precautionary measures are necessary when using and storing the knives: we recommend that you avoid damp environments and that you dry and grease the blade after use.
The hardnesses obtained after heat treatment are theoretically slightly greater in steels that do not contain chrome. The cutting strength is therefore better with a “carbon” steel and sharpening of carbon steel blades is much easier than sharpening of stainless steel blades.
Stainless steel
The addition of chrome very markedly increases resistance to corrosion caused by moisture. Steels are then called “stainless” and they can be used with fewer restrictions. The stainless steel capable of undergoing the heat treatment that gives it its good hardness is called martensitic. It has a carbon content of at least 0.40%, giving it a good cutting edge but which explains why knife blades are not totally corrosion-proof. Only a carbon-free steel would be, but it would not have the hardness guaranteeing a good cutting quality and the excellent strength of the cutting edge. |
