Quenched treatment: quenching + tempering = double heat treatment and quenching and tempering , and its purpose is to make the work with good mechanical properties.

Quenched :
Heat treatment of steel , including annealing, normalizing , quenching, tempering and surface heat treatment methods. Which also includes quenching and tempering treatment and aging treatment . Tempering of steel: according to the desired mechanical properties of hardened steel that has been reheated to (350 ℃ ~ 650 ℃) performed between a certain temperature, the carbon is in the form of fine cementite precipitates are distributed . With increasing tempering temperature , the carbide particles is increased , the yield point and tensile strength decrease , reduce the hardness and brittleness , the elongation and shrinkage increases . Its purpose is to eliminate the internal stress generated by quenching to obtain the desired mechanical properties .

 Tempering of tempering , tempering and tempering categories.
 Tempering : 500 ℃ ~ 650 ℃
 Tempering temperature : 300 ℃ ~ 450 ℃
 Tempering : 150 ℃ ~ 250 ℃
Quenching method
Quenched treatment: quenching and tempering method is called quenching . Tempering means tempering between 500-650 ℃. Quenched and tempered steel can make performance , material adjustments to get to a large extent , its strength, ductility and toughness are good , with good mechanical properties. Quenched and tempered sorbite after treatment . Sorbite (tempered sorbite) is tempered martensite formed at the time , under the microscope optical zoom lens with more than 500 to 600 times in order to distinguish them , the distribution of carbide ferrite matrix ( including infiltration carbon body ) composite pellets organization . It is also a tempered martensite , and a mixture of ferrite and granular carbides . At this ferrite is substantially free of carbon supersaturation , stable carbides are carbides . At room temperature is a balanced organization .

Aging treatment
Aging Treatment: In order to eliminate or mold precision measuring , part size, shape changes in the long term , often at a low temperature tempering ( tempering temperature of 150-250 ℃) before finishing the workpiece reheated to 100-150 ℃ , 5 to 20 hours to maintain this quality and precision parts for the treatment of stable , called aging . In the steel member or dynamic loading conditions of low temperature aging treatment to eliminate residual stress, tissue stability and size of steel , is particularly important.

Category:Quenched and tempered steels are carbon steel and alloy quenched and tempered steel two categories , either carbon or alloy steel , the carbon content of more stringent controls . If the carbon content is too high, the strength of the workpiece after quenching is high, but the toughness is not enough, as the carbon content is too low, toughness and lack of strength. In order to get a good piece quenched overall performance , the general control of the carbon content of 0.30 to 0.50 %.

When quenching quenching hardenability requirements entire cross-section of the workpiece , the workpiece fine needle to get to the main quenched martensite microstructure . By tempering to obtain a uniform sorbite oriented microstructure . Each furnace is impossible to engage in small factories metallurgical analysis , generally only for hardness testing, that is to say , must meet hardness after quenching quenching hardness of the material, the hardness required to check in Figure tempering .

Su's heat treatment Co. Ltd. was founded in 1990, after decades of development, scale is continually expanding, is located in Shajing Town Baoan District Shenzhen City Bridge second industrial zone, covering an area of 3000 square meters, the main business is to take all the metal, alloy steel, beryllium copper, heat treatment of high speed steel, cryogenic treatment (-196 C), nitrogen gas, liquid nitrogen, QPQ salt bath production line, high-frequency quenching, blackening and carburizing, the surface of hard and stainless steel processing.
The company is equipped with power of heat treatment technology, established a perfect quality testing equipment, equipped with vacuum quenching furnace, vacuum furnace, pit furnace, furnace, liquid nitrogen atmosphere furnace, rotary furnace, large mesh belt furnace, improve metallographic inspection equipment, material failure analysis, scientific management and complete, rigorous technology, skilled operation.
Company will be excellent quality and perfect service, and actively challenge, satisfy customer demand, has passed ISO9001:2000 in 2003 September (SGS) international quality certification. Has now become a reputable manufacturers.