... hardness, high toughness, and high hardenability, etc. 12.Widely used in industries of steel, rubber, papermaking, and so on. ... Steel— Rough Progressing— Heat Treatment— Finishing— TestingWe manufacture double sides trimming knife up to 5800mm(255.905 inches) for ... including internal grinder, external grinder, surface grinder, CNC grinder, electric spark CNC wire-cut etc. The company can produce ...