The pressure processing and heat treatment operations combine to make the forming process to obtain a final performance with a unified kind of process methods.
Pipe thermomechanical treatment of metal heat treatment proThermomechanical treatment not only be able to get the general processing of the reach of high-strength, high ductility with high toughness and good, but also greatly simplifies the seamless steel pipe production process, leading to a very good value for money. Depending on the deformation temperature thermomechanical treatment can be divided into high and low temperature thermomechanical treatment thermomechanical treatment. High-temperature thermomechanical treatment of steel is heated to slightly above the Ac3 temperature for a period of time to reach fully austenitic, and then at this temperature with a large amount of deformation of the austenite occurs strongly deformed, and held some time for the austenite After the body is starting recrystallization temperature by controlling the deformation parameters to obtain the desired deformation austenite organization before and has not yet started to grow up deformed austenite grains before quenching and tempering, thereby to obtain more fine martensite. Thermomechanical treatment process of plastic deformation (plastic deformation), you can use rolling, forging, extrusion, drawing and other forms; its mate have eutectoid decomposition phase transition, martensitic transformation, desolventizing like. Deformation and phase transformation order is also varied: there are first deformation phase transition; deformation or phase transformation processes; can also be a strain between the two phase transition.
High-temperature thermomechanical treatment, is to stabilize the austenitic steel is heated to maintain a period of time, the deformation at that temperature, followed immediately by rapid cooling to a certain temperature in order to obtain the required integrated process organization. If rapid cooling to air cooling bainitic finally get bainite bainite of high temperature deformation is called. If the fast-cooling to pearlite transformation zone to obtain a ferrite pearlite structure, which is commonly referred to as controlled rolling and controlled cooling process.
Low-temperature thermomechanical treatment, the steel is heated to an austenitic state, to maintain a certain time, rapidly cooled to a temperature below an intermediate (metastable austenite region) is deformed, and then rapidly cooled to room temperature, the integrated process. After rapid cooling to obtain low-temperature thermomechanical treatment martensite, known as low-temperature deformation hardening. With this process steel must have a relatively large metastable austenite region in order to have sufficient time to deform. Ms deformation temperature and deformation in the vicinity of the heat treatment process under are called martensitic transformation during deformation martensite after heat treatment and thermomechanical treatment. Low-temperature thermomechanical treatment is hardened steel heating large reduction deformation temperature phase transformation point to, and then heated to a temperature above Ac3 heat for a short time, rapid quenching after austenitizing and tempering. The results show that for low, medium carbon steel, the tempered martensite by 80% compression set after austenitization 0191μm austenite grain size can be obtained, and after quenching obtain very fine Markov body tissue.
Optimum efficiency control of high frequency welded pipe in welding process
In most cases, optimized welding process, power loss can be reduced 50% and can improve the welding quality, reduce downtime, increase production.
Stress on the trench corrosion of high-frequency straight seam resistance welding pipe
Trench etching is generally believed that acute heat in the welding process, the results of local tissue metal and chemical change caused by quenching.
Technology of straight seam high frequency resistance welded steel pipe
Factors that affect the raw material for the steel pipe welding quality affect the quality of raw materials are mainly steel mechanical properties unstable surface defects and strip geometry deviation big three aspects, therefore, we should focus on these three aspects of control.
