During the whole process of the heat treatment method, the parts should be overhauled as much as possible in the heat treatment process, and the structural parts that require process performance indicators should be heat treated as much as possible before the heat treatment process can meet the process performance requirements. After heat treatment of medium and metallographic stainless steel plates and large, medium and small stainless steel castings, try to widen the temperature heat treatment to eliminate the internal stress caused by heat treatment.
The annealing treatment of cold-drawn seamless steel pipes is a heat treatment process in which the metal composite materials and aluminum alloy profiles are heated to an appropriate temperature, kept for a certain period of time, and then slowly cooled. After heat treatment, the sub-hypereutectoid steel is the alloy composition plus the small metallographic structure; the hypereutectoid steel or the hypereutectoid steel is the particle metallographic structure. In general, the heat-treated structure is a structure close to the equilibrium state.
Heat treatment is a heat treatment process that heats up the thick-walled pipes and tubes of cold-drawn seamless steel pipe specifications to 45°C above Ac3, and then cools them in the air that does not move after a suitable time of thermal insulation.
The heat treatment of hypereutectoid steel is heated by a knife above Acm, so that all the ferrite in the original network is melted into austenite, and then cooled at a fast speed to inhibit the precipitation of ferrite in the development of austenite texture. Thereby, the porous structure pearlite can be eliminated and the structure of the hypereutectoid steel can be improved. Welding parts require electric welding tensile strength parts with heat treatment to improve the electric welding structure and ensure the electric welding tensile strength.
There are some thick-walled pipes with seamless pipe specifications that cause a part of martensite transformation during forging, resulting in hard structures. In order to better eliminate such poor structures, when heat treatment is selected, the heat treatment temperature should be increased by about 20 °C compared with all normal heat treatment temperatures. The heat treatment production process is relatively simple, which is beneficial to the use of forging waste heat to recycle and utilize heat treatment, which can save resources and reduce production cycles. Improper heat treatment production process and operation process also lead to tissue defects, which are similar to heat treatment, and the rescue method is basically the same.
