We all know that we will undergo multiple processing heat treatments, so what are the specific heat treatments that may be used? Below, we briefly explain several heat treatment concepts.

1. Normalizing: heating the steel or steel parts to the critical point of the temperature held for a period of time after cooling in the air.
2. Annealing: the workpiece is heated to 20-40 degrees above the critical point, after holding for a period of time, with the furnace slowly cooled or air-cooled oil cooled to 500 degrees below the heat treatment technology in the air.

3、Solid solution thermal treatment: the alloy is heated to a high temperature single-phase area at a constant temperature to persist, so that the excess phase is fully dissolved in the solid solution, and then rapidly cooled to get supersaturated solid solution thermal treatment technology.
4. Ageing: After solid solution heat treatment or cold plastic deformation, the workpiece is placed at room temperature or slightly above room temperature and persisted, its function changes with time. The time mentioned here may be a few hours, may also be a few days oh, China's early Dalian machine tool factory is very famous, because their important workpiece such as to body slide, are placed in the sea for several years to get good mechanical properties. Confused people also thought it was put idle products, in fact, this is a kind of aging treatment.

5、Solid solution disposal: make the alloy in a variety of phase dissolution, standard parts to strengthen the solid solution and improve the toughness and corrosion resistance, eliminate stress and softening, in order to continue processing molding.
6. Aging disposal: heating and holding at the temperature of the reinforced phase separation, so that the reinforced phase deposition separation, to harden and progress in strength.

7. Quenching: steel austenitizing after cooling at the appropriate cooling rate, so that the workpiece in the cross-section of the whole or a certain range of unstable arrangements such as martensite layout transformation of heat treatment techniques.
8. Tempering: the quenched workpiece will be heated to the critical point below the appropriate temperature to adhere to a certain time, followed by the required method of cooling, in order to obtain the required arrangement and function of the heat treatment technology.

9. Carbonitriding of steel: Carbonitriding is the process of entering carbon and nitrogen together into the surface layer of steel. Customary carbonitriding, also known as cyanidation, is now more widely used in medium-temperature gas carbonitriding and low-temperature gas carbonitriding (i.e. gas nitrocarburizing). The primary intention of medium temperature gas nitriding is to improve the hardness, wear resistance and fatigue strength of the steel. Low-temperature gas nitriding is based on nitriding, and its primary intention is to improve the wear resistance of steel and resistance to galling.

10. Tempering: It is usually customary to combine quenching and high-temperature tempering with a thermal treatment called tempering. Tempering is widely used in a variety of important layout parts, especially those operating under alternating loads, such as connecting rods, bolts, gears and shafts. Tempering treatment to get tempered sowthite arrangement, its mechanical function are better than the same hardness of the normalized sowthite arrangement. Its hardness depends on the high temperature tempering temperature and is related to the tempering stability of the steel and the cross-sectional scale of the workpiece, usually between HB200-350.

11. Brazing: A heat treatment technique in which two workpieces are bonded together with a brazing material.