Slitting knives. The slitting knives are mainly applied for the sheet metal plate, strip, leather,Aluminum foil,film cutting and packaging machinery. The material is made of high quality cutting tool steel Carbide, HSS, 9CrSi, SKD, SKH, T10, 6CrW2Si, Cr12MoV, LD, D2,H13 and W18Cr4V.