Matrix steel

matrix steel (matrix steel)
named for its chemical composition approximate high-speed steel substrate. It is a collection of gold structural steel, high-speed tool steel and bearing steel and other steel characteristics. The heat treatment can be obtained with high-speed tool steel, high strength and hardness of this steel, with similar ultra-high strength structural steel ductility and toughness. Usually the base steel containing 0.50% to 0.55% carbon, and add a total of 10% to 20% tungsten, molybdenum, chromium, vanadium, cobalt and other alloying elements. Consumption smelting furnace with a vacuum to remove gases and impurities, in order to obtain pure material. Forging process and high-speed tool steel annealing temperature of 870 ~ 890 ° C, by heating, insulation gentle cold, easy to make the material to soften, then. On the cutting. General hardening subject to preheat of 810 ~ 850 ° C, then heated in a salt bath furnace in 1100 ~ 1150 ℃ 5 ~ 10min, remove the air-cooled or salt bath cooling or oil cooling World steel pipe network editing , 510 ~ 620 ° C tempering for 2 or 3 times World Steel Pipe News , each insulation 2h. Matrix martensite steel after quenching, the matrix composition and the same high-speed tool steel matrix composition, and contain no more than 5 percent of undissolved carbides. Containing the remainder of the brittle carbide is much less than the high-speed tool steel, ductility and toughness of 10 to 15 times higher than the high-speed tool steel. Secondary hardening, tempering and thus high hardness and strength, and high red hardness and heat resistance, mold can be used as the cold work and heat pipe cutting tools, ultra-high strength fasteners, shaft, bearings, gears , pressure vessels, high-speed rotor, airframe, turbine components, rocket motor case and so on.