Kohetsu HAP40 Knives Introducing a Chefknivestogo Exclusive! Kohetsu HAP40 knives are a new line that will appeal to the performance customer that wants unmatched edge retention. HAP40 is a semi stainless, Powdered High Speed Steel that takes and holds an edge better than any other steel available on our site. We think it holds the potential to become one of the best steels on the market for the production of high quality kitchen knives. Hitachi manufactures this steel and it contains abundant amounts of hard elements like W (Tungsten), Mo(molybdenum), V(Vanadium) & Co(Cobalt) We heat treat this steel for optimal performance at 65 HRC and you will find this blade will hold it's edge an amazingly long time. Handles are Mahogany with stainless bolsters. Later we will offer these with wa-octagonal ho wood handles and buffalo horn ferrules.