... (W18,W9,W6,W5,W2) 1.Used in making all kinds of planner knife, 2.Flat, bars,heat ... W9,W6,W5,W2)Planer knife1.Main applicationUsed widly in making all kinds of knife, also for cold work moulds ... service life requirements, such as punching die, cold extruding mould, precision measuring tool.2.Specification:Conventional or ESR, hot rolling ... 5.Steel grade: W18=T1 W6=M2 HSS for Making Knife(W18,W9,W6,W5,W2)