- O-1 (High Carbon Tool Steel)
Reference - O1 Steel Composition Analysis
"Good edge stability and wear resistance"
"Works well with refined edges"
- CPM-154 (Powdered Stainless)
Reference - Crucible CPM154 Steel Composition Analysis
"CPM - Crucible Particle Metallurgy(CPM™) is Crucible's proprietary technology, invented circa 1970. During the first stage of the process, molten metal is poured though a small nozzle with high pressure inert gas, transforming liquid stream into a spray of small, spherical droplets. Droplets fall through the cooling(or atomization) tower and solidify. Solidified particles are screened and collected into sealed containers and then consolidated using hot isostatic pressing(HIP) at temperatures close to those used for forging. Short list of CPM process benefits includes refined grain size, improved toughness, wear resistance, grindability, consistent heat treatment response, etc."
We use a heat treat service that specializes in knives.
For stainless knives a vacuum furnace is employed where the air is pumped out and then it's back filled with heat treat grade nitrogen to provide a pure environment for heating the blade.
For carbon knives, oil hardening steels, molten sand (yes sand - not salt) pots are used to heat the blades. This system provides a superb environment for bringing the steel's elements into solution, it's as high tech as you can get.
All blades receive cryogenic treatment through the use of an atmospheric nitrogen chamber where the liquid (in the nitrogen) is drained off and the chamber is then gasified with air. The knives are not dipped into liquid nitrogen, as is common, so as to avoid thermal shock. The goal of cryo treatment is to optimize the amount of martensitic iron in the structure of the steel while minimizing the residual amount of austenitic iron. In turn, the qualities most sought in a knife blade are enhanced, particularly edge holding through a higher hardness rating.
Each blade is tested using a state of the art Wilson Instruments Rockwell hardness tester to ensure proper hardness has been achieved.