Pipe quenching is heated to above the critical temperature, holding time, and then quickly into the hardening agent to a temperature suddenly decreased to a rate greater than the critical cooling rate of rapid cooling, martensite is obtained based not equilibrium microstructure heat treatment method. Quenching can increase the strength and hardness of steel, but to reduce their plasticity. Quench hardening agent commonly used are: water, oil, alkaline and salt solutions and so on.

Pipe tempering will have been reheated quenching of steel to a certain temperature, and then a cooling method is called tempering. Its purpose is to eliminate the internal stress generated by quenching to reduce the hardness and brittleness, to achieve the desired mechanical properties. Tempering of high-temperature tempering, tempering temperature and tempering categories. More with the quenching and tempering, normalizing conjunction.

Quenching and tempering is a pipe very important of heat treatment process and very extensive application process. Quenching can significantly improve the strength and hardness of steel. If matched with different temperature tempering, you can eliminate (or reduce) quenching stress, but also get strength, hardness and toughness of the match, to meet different requirements. Therefore, quenching and tempering are inseparable two heat treatment process.

Conditioning is quenching and high temperature tempering heat treatment process. Quenched pieces mostly in relatively large dynamic loads work, they bear the tension, compression, bending, twisting or shearing effect, but also has some surface friction, requires a certain degree of wear resistance and so on. In short, in a variety of composite parts working under stress. Such parts mainly for various machines and institutions structural parts, such as shafts, connecting rods, bolts, gears, etc., in machine tools, automobiles and tractors and other manufacturing industries using very common. Especially for heavy machinery in the manufacture of large parts quenched with even more. Therefore, quenching and tempering heat treatment occupies a very important position.