... or HB380~450 We specialized in manufacturing various grader blade for all brands of Motor grader, Bulldozers,Excavator,Loader and Scraper.A) Part ... .: Grader blade 5D9553 B) Material: High carbon steel or boron steelC) Hardness: HB260~320 or HB380~450 D) For brands:Komatsu, ... ESCO, Fiat, Hyundai, Case, Sany etc.E) OEM: Make as customer's samples or drawingsPart of the grader blade are ...