CEMENTED CARBIDE-STEEL COMPOSITES FOR EARTHMOVING AND MINING APPLICATIONS

摘要

Abstract of the DisclosureA composite structure is disclosed which comprises a combinationof heat treatable cemented carbides and alloy steel. The carbide phase inthe cemented carbide is predominantly tungsten monocarbide, or solid solutionsof tungsten monocarbide and molybdenum monocarbide, of stoichiometric composi-tion. The binder in the cemented carbide is based on heat treatable low tomedium alloy steel and contains less than 2.5 percent by weight vanadium andless than 8 percent by weight chromium. A method for making the cementedcarbide is also disclosed. The composite structure is formed by integralcasting in steel of the preformed cemented carbide. The composite structurecan be heat treated to the desired hardness and toughness properties. Theprimary area of application of the composites of the invention are in diggerteeth for earthmoving, in mining and ore-comminution tools, and in cutterheads for deep-well drilling.