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allowed to cool alloy steels annealing austenitic burner carbon content carbon steels carburizing case-hardening cementite cent carbon chapter chromium cold junction colours combustion composition containing cooling rate core cracking critical range cutting edge cyanide decarburization designed distortion effect electric ensure flame forging furnace furnace atmosphere galvanometer gases gears give grain hardening temperature hardness hearth heat-resisting heat-treatment heat-treatment furnaces heating period high temperature high-speed steels higher insulating iron layers liquid low temperature lower machining magnetic manganese martensitic material mechanical metal method mixture molten molybdenum nickel nickel-chromium nitriding normalizing obtained operation oxidation pearlite perature piece platinum pressure produce properties pyrometer quenched in oil quenching medium radiation refractory reheating resistance resistance thermometer result s-icon salt bath scale shafts soaking suitable surface Table tank tempering temperature tensile strength thermo-couple thermometer tion tool steels town gas treatment tungsten ture uniform usually vanadium wire