Steel Bonded Carbide Description (2/2)

Steel bonded carbide has many advantages, compared with conventional steel, it has higher hardness, wear resistance, hardenability (the ability to obtain the hardened layer depth of quenching); compared with tungsten carbide, it has excellent machinability (such as turning, milling, planing, etc.,), heat treatable and weldable. It also by forging changes its dimensions and internal organizational structure to improve performance, which is generally not available in tungsten carbide. By electrical welding, insert welding, surfacing, vacuum welding, steel bonded carbide can meet a variety of application needs.

Steel bonded carbide also has a smaller proportion of high specific strength, good self-lubricating, high natural frequency and damping characteristics, a significant damping effect. Wherein the circular SiC grains is working with the workpiece surface forms rolling friction, so as to effectively avoid the adhesion of wear and abrasion wear. Combined with the advantages of steel and tungsten carbide, steel bonded carbide has a wide scope of application, which can be used in military materials, marine, aerospace materials, high temperature and corrosion-resistant parts, wear parts of damping, mold material, crushing mining tools, measuring instruments and some fields has special requirements of materials proportion and overall performance.

The machining principle of steel bonded carbide is low cutting rate, accurate control of cutting depth and length, do not add any coolant (except grinding process). If we violet these principles, the surface of steel bonded carbide will be hardened, which hiders the machining process. Material of the tool in the milling process usually uses the high-speed steel and carbide; drilling process should not add coolant to ensure that no oil and drill using medium voltage feed and promptly chip to prevent debris from wear and tear on the drill bit; grinding with high hardness, good self-sharpening diamond grinding wheel 120 #, but should pay attention to the amount of coolant; after quenching, steel bonded carbide will easily crack in the process of electrical machining. In order to prevent the cracks from appearing or extending, it should be extending the annealing time until the stress relief and using quenching or isothermal quenching process.

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