Specification: 1 hardness: 52-62HRC 2 useful life: can be produced more than 200000 cubic meter concrete or 300000 tons asphalt 3 material: Hi-chrome 4 standard: CN: KM TB Cr 15-25-GT US: ASTM A532 Class Two Type D 5 strength of extension: 380 N/ mm2 6 extension at break: 1% 7 shock impact( resistance) value: > 5 ak N.M/ CM2 8 flexuralstrength: > 600 ak N.M/ CM2 9 certification: ISO9001: 2008