In the forging process of stainless steel, "annealing" is an essential process. Annealing requires the use of annealing furnaces, bright annealing furnaces are mainly used for the finished heat treatment of stainless steel in a protective atmosphere. The performance is different, the requirements for bright annealing furnaces are different, and the heat treatment industry is not the same. The typical heat treatment process of 300 series austenitic stainless steel pipe is solid solution treatment. The key to this heat treatment process is rapid cooling, from 1050 to 1150 ° C, appropriate heat preservation for a short period of time, so that the carbide is all dissolved in austenite, and then quickly cooled to below 35 ° C. 400 series ferritic stainless steel pipe heating temperature mostly using slow cooling to obtain annealed softened structure.
And, the three stages of "annealing" will make your steel pipe surface bright and durable. Firstly, heating stage, the stainless steel pipe is in the closed furnace, and it is necessary to ensure that the position of the inlet and outlet pipe is kept sealed and no air leakage is allowed. Because it is heated in the reducing atmosphere of inert gas and ordinary hydrogen, a certain temperature is reached, and the metal grains are restored to a uniform and fine state. Secondly, insulation stage, the temperature of the stainless steel pipe is insulated and stabilized for a certain period of time through the insulation section, so as to more effectively eliminate the possibility of grain boundary chromium deficiency and avoid the generation of intercrystalline corrosion. The steel pipe after the stabilization treatment has better mechanical properties and corrosion resistance. Thirdly, cooling stage, the stainless steel pipe uses hydrogen in the closed furnace to achieve the effect of rapid cooling, the graphite sleeve heat dissipation and the circulating water system take away the heat, and the reason for bright annealing with a small amount of hydrogen to avoid oxidation and decarbonization, and obtain a surface without oxidation and good corrosion resistance.
In the process of annealing, there are also certain requirements for the annealing furnace, and attention must be paid to the protection of the annealing furnace. The annealing furnace uses hydrogen as a protective gas. Once hydrogen leaks, it can be dangerous to rise and accumulate in a tower structure. So we must take relevant measures to ensure safety.
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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