Annealing can make the structure and composition of steel pipes uniform. This is especially important for raw materials. Because in the process of bending the steel strip into a tube, the force applied to each part is different, and after welding into a tube, there will definitely be differences in temperature and cooling rate, resulting in inconsistent structure.
Annealing treatment makes the atoms in the structure of the steel pipe more active at high temperature, dissolves the phases, and the chemical composition tends to be uniform. After rapid cooling, a uniform single-phase structure is obtained. It can also demagnetize the cold-processed pipe. Stainless steel pipes used in high-precision parts need to be demagnetized. We have also built pipe annealing projects for many world-renowned semiconductor manufacturers and helped customers obtain high-quality orders.
Annealing can reduce the hardness and improve the toughness of stainless steel pipes. The principle is: annealing treatment restores the distorted lattice in the pipe, recrystallizes the elongated and broken grains, eliminates internal stress, eliminates work hardening, thereby reducing the hardness of the pipe, improving ductility, reducing the tensile strength of the steel pipe, and improving the processing performance of the pipe. It is more convenient to use in product processing later, and the yield rate is also higher.
Finally, annealing can restore the inherent corrosion resistance of stainless steel. Due to the precipitation of carbides and lattice defects caused by cold processing, the corrosion resistance of stainless steel decreases. After solution treatment, the corrosion resistance of steel pipes is restored to the best state. Stainless steel pipes after annealing can be used for fluid transportation pipelines such as food hygiene and medicine.
For stainless steel pipes, the three elements of solution treatment are temperature, insulation time and cooling rate.
The heating temperature range is about 1050-1200 degrees Celsius. The specific temperature setting depends on different materials. The solution temperature is mainly determined by the chemical composition. Generally speaking, for grades with many types and high contents of alloy elements, the solution temperature should be increased accordingly. In particular, for steels with high manganese, molybdenum, nickel and silicon content, only by increasing the solution temperature and making them fully dissolved can the softening effect be achieved.
However, for stabilized steel, such as 1Cr18Ni9Ti, when the solid solution temperature is high, the carbides of the stabilizing elements are fully dissolved in the austenite, and will precipitate at the grain boundary in the form of Cr23C6 during the subsequent cooling, causing intergranular corrosion. In order to prevent the carbides of the stabilizing elements (TiC and NbC) from decomposing and solid solution, the lower limit solid solution temperature is generally adopted. Stainless steel is commonly known as steel that is not easy to rust. In fact, some stainless steels have both stainlessness and acid resistance (corrosion resistance). The stainlessness and corrosion resistance of stainless steel are due to the formation of a chromium-rich oxide film (passivation film) on its surface. Among them, stainlessness and corrosion resistance are relative.
The determination of the holding time and cooling rate also follows the above rules. If you want to know the specific technical parameters, you can send us the specifications, materials, purpose of the pipeline, production speed of the production line, and outlet temperature after cooling. Hangao's professional technical team will calculate all relevant parameters for you and match the appropriate induction heating furnace annealing treatment equipment for you. If you have any questions about industrial pipe annealing, please communicate with us!
Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.
Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
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