The main reasons why large-diameter steel pipes require heat treatment include increasing strength and hardness, improving wear resistance and corrosion resistance, eliminating internal stress, improving mechanical properties and processability, etc. Next, HANGAO Tech (SEKO)takes you through the importance of heat treatment to the performance of large-diameter steel pipes.
(1) Improve strength and hardness
Heat treatment is a technology that can change the internal structure of steel pipes and improve the internal structure of metal materials through heating, insulation and cooling processes. It can make pipe materials form structures such as austenite, martensite and bainite, thereby greatly improving its mechanical properties, such as the strength, hardness, toughness and fatigue strength of steel pipes.
For example, the quenching process heats the steel pipe above the critical temperature and then rapidly cools it to form a hard and brittle martensite structure inside, which significantly improves the strength and hardness of the steel pipe. This helps the pipeline maintain stable performance and extend its service life when it withstands high temperatures, high pressures and corrosive environments.
(2) Improve wear resistance and corrosion resistance
The safety of pipelines is crucial when transporting fluid media, especially flammable, explosive, toxic and harmful substances. During the working process of the pipeline system, its efficiency is closely related to the thermal conductivity, thermal expansion and other properties of the material. Through heat treatment technology, these properties can be optimized, so that the pipeline system can better adapt to the temperature changing environment during work, reduce the impact of thermal stress on the system, thereby improving the transmission efficiency and overall performance of the pipeline system. Through heat treatment, residual stress in the pipe material can be eliminated, reducing the risk of deformation and cracking. In addition, heat treatment can also improve the corrosion resistance of materials and enhance the resistance of pipelines to external environmental erosion, thereby ensuring the safe operation of the pipeline system.
In addition, heat treatment can change the organizational structure of the steel pipe surface and form a surface layer with high hardness and high wear resistance, thereby improving the wear resistance and corrosion resistance of the steel pipe. For example, surface quenching uses induction heating or flame heating to rapidly heat and quench the surface of the steel pipe to form a high-hardness surface layer; carburizing and nitriding treatments infiltrate carbon or nitrogen into the surface of the steel pipe at high temperatures to form a hard carburized layer. Or nitrided layer to enhance wear resistance and corrosion resistance.
(3) Eliminate internal stress
During the manufacturing and processing processes, steel pipes will generate internal stresses, which may cause deformation, cracking or failure of the steel pipes during use. Heat treatment can effectively eliminate or reduce these internal stresses and maintain the dimensional stability and shape accuracy of steel pipes. For example, the annealing process releases internal stress by heating to a certain temperature and then slowly cooling it, making the structure uniform and the performance stable.
(4) Improve mechanical properties and processability
Heat treatment can improve the plasticity, toughness and impact properties of steel pipes, making them less likely to break when subjected to high loads and impacts, and extending their service life. In addition, heat-treated steel pipes have better processability and are easy to cut, weld and form, reducing processing difficulty and cost. For example, annealing and normalizing treatments can refine grains, improve mechanical properties, and prepare for the next step.
In summary, pipes require heat treatment to improve material properties, increase safety, and promote the efficiency of the piping system. This process ensures the stable operation of pipelines in various complex environments, ensures production and life safety, and also improves the transmission efficiency and overall performance of the pipeline system.
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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