... W5,W2) 1.Used in making all kinds of planner knife, 2.Flat, bars,heat treatment High speed steel(W18,W9 ... )Planer knife1.Main applicationUsed widly in making all kinds of knife, also for cold work moulds with high precision, long ... tool.2.Specification:Conventional or ESR, hot rolling or forging, black surface or millingAnnealed, hardness , HB2553.GeneralThorough hardenability, high tough resistance ...