Several common heat treatment concept

Is fire, the steel or steel heated to a critical point AC3 or ACM more appropriate temperature keeping time, cooled in the air after get pearlite heat treatment process of the organization. Annealing annealing: hypoeutectoid steel workpiece heated to above AC3 20 - 40 degrees, heat preservation after a period of time, with the slow cooling furnace ( Buried in the sand or lime in cooling) Limitation: alloy after solution heat treatment or cold plastic deformation at room temperature or slightly higher than room temperature keeping, the phenomenon of its performance change with time. Steel carbonitriding: carbonitriding is to steel surface infiltration process of carbon and nitrogen at the same time. Traditionally carbonitriding, also known as cyanide, is currently in medium temperature gas carbonitriding and low temperature gas carbonitriding ( The gas soft nitriding) Are more widely application. Medium temperature gas carbonitriding's main purpose is to improve the steel hardness, wear resistance and fatigue strength. Low temperature gas carbonitriding with nitriding is given priority to, its main purpose is to improve the wear resistance of steel and resistance to bite. Tempering treatment quenching and tempering: general habits will be the combination of high temperature quenching and tempering heat treatment known as conditioning treatment. Conditioning treatment is widely used in various important structural parts, especially those who work under alternating load of connecting rod, bolts, gears and shaft, etc. Conditioning treatment after get tempered sorbite organization, its mechanical performance than the same hardness of normalizing sorbite for optimal organization. It depends on the high temperature tempering temperature and hardness and tempering stability of steel and the workpiece with the size of section, generally in HB200 - 350. Brazing: the two kinds of artifacts together with solder heat treatment process