... by material ASTM 5140 or ASTM 4140, heat treatment with 38-42HRC hardness, has high toughness and wearable character ... by material ASTM 5140 or ASTM 4140, heat treatment with 38-42HRC hardness, has high toughness and wearable character ... in mining and construction, tunneling, steel, forestry, the natural stone industries or road building. Place of originZhejiang.ChinaApplicationDrilling,Trenching, ...