[introduction] heat treatment refers to the material in the solid state, through heating, insulation and cooling means changing the chemical composition and microstructure of the surface or internal, a metal heat processing required for performance.

1, normalized (Normalizing): steel or steel is heated to the critical point of Ac3 or Acm above the proper temperature to maintain a certain time in the air cooling, thermal treatment process pearlite organization.
2, annealing (Annealing): hypoeutectoid steel workpiece is heated to above AC3 20~40, thermal insulation for a period of time, furnace cooling (or buried in the sand or lime cooling) to 500 degrees Celsius in air cooling heat treatment process.
3, solid solution heat treatment (Solution Heat Treatment) that the alloy is heated to a high temperature phase region of constant temperature, the excess is fully dissolved into the solution, and then rapidly cooling, to get the heat treatment process of saturated solid solution.
4, aging (Aging): after the solid solution heat treatment or cold plastic deformation, at room temperature or slightly higher than the room temperature, the performance changes with time.
5, solid solution treatment (Treatment Solution): the various phases of the alloy fully dissolved, strengthen the solid solution and improve the toughness and corrosion resistance, stress and softening, so as to continue processing.
6, aging treatment (treatment aging): in the strengthening of the precipitation temperature and heat insulation, so that the strengthening phase precipitation, to harden, improve strength.
7, quenching (hardening): after the steel austenite to the appropriate cooling rate cooling, so that the workpiece in the cross section of the whole or a certain range of martensite, such as the instability of the transformation of the structure of the heat treatment process.
8, tempering (tempering): after quenching the workpiece to the critical point of proper temperature below AC1 to maintain a certain period of time, then meet the cooling requirements of the method, in the process of heat treatment for the needs of the organization and performance.
9, the steel of carbon and nitrogen (carbonitriding Steel): carbon and nitrogen is the surface of the steel to penetrate into the process of carbon and nitrogen. Habit of carbon and nitrogen is also known as cyanide, in the middle temperature gas carbon and nitrogen permeation and low temperature gas carbon nitrogen (ie gas soft nitriding) more widely used. The main purpose of the medium temperature gas is to increase the hardness, wear resistance and fatigue strength of the steel. The main purpose of the low temperature gas nitriding is to increase the wear resistance and the resistance of the steel.
10, quenching and tempering treatment (andtempering quenching): the general habit of quenching plus high temperature tempering combined with heat treatment called quenching and tempering treatment. Quenching and tempering are widely used in all kinds of important structural parts, especially those connecting rod, bolt, gear and shaft under the alternating load. After quenching and tempering tempering sorbite, its mechanical properties are better than the same hardness normalizing sorbite better. Its hardness depends on the high temperature tempering temperature and the tempering stability of the steel and the size of the workpiece cross section, generally in the HB200— 350.
11, brazing (brazing): two kinds of workpiece with the heating and melting of the heat treatment process.
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