Manufacturing technology for high-strength seamless steel pipe
A technology of seamless steel pipe and manufacturing process, applied in the field of steel pipe manufacturing, can solve the problems of unreasonable annealing steps of steel pipe and unsatisfactory steel pipe strength, and achieve the effect of ensuring strength and removing stress completely.
Inactive Publication Date: 2021-04-02
衡阳鸿常机化有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to solve the shortcoming of unreasonable annealing steps of steel pipes in the prior art, which leads to the unreasonable strength of steel pipes, and proposes a high-strength seamless steel pipe manufacturing process
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no. 1 example
[0015] A high-strength seamless steel pipe manufacturing process, comprising the following steps: round tube billet, heating, piercing, extrusion, stripping, annealing, cooling, straightening, hydraulic test, marking, storage, and the annealing includes the following steps :
[0016] The seamless steel pipe is cooled to 300-330 degrees Celsius by a fan, and then spheroidized annealing is carried out in a continuous heat treatment furnace. The heat treatment furnace includes a heating section, a heat preservation section, and a slow cooling section. Slow cooling section 400-450 degrees Celsius;
[0017] Wherein, the steel pipe is kept in the heat preservation section for 1-2 hours, and immediately after one end of the heat preservation period, it is sent to the slow cooling section for 5-8 hours. After slow cooling, it is sent into a cooling liquid at 100-150 degrees Celsius for rapid cooling.
[0018] As another example of the annealing step:
[0019] Described annealing com...
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The invention relates to the technical field of steel pipe manufacturing, in particular to a manufacturing technology for a high-strength seamless steel pipe. According to the manufacturing technology, the annealing process comprises the following steps that a seamless steel pipe is cooled to 300-330 DEG C through a draught fan, and then spheroidizing annealing is carried out in a continuous heattreatment furnace, wherein the heat treatment furnace comprises a heating section, a heat preservation section and a slow cooling section, the temperature of the heating section is 700-750 DEG C, thetemperature of the heat preservation section is 730-740 DEG C, and the temperature of the slow cooling section is 400-450 DEG C; and the slow cooling time is 5-8 hours, and after slow cooling, the seamless steel pipe is fed into cooling liquid at the temperature of 100-150 DEG C for rapid cooling. According to the manufacturing technology for the high-strength seamless steel pipe, the steel pipe is rapidly cooled to 300 DEG C through the draught fan, then the steel pipe is fed into the heat treatment furnace with the higher temperature, stress generated after cooling is fully released, in addition, cooling is carried out through oil in the slow cooling section, the oil is adopted in the slow cooling process and is milder, stress removal is more thorough in the mode, and the strength of thesteel pipe is better guaranteed.
Description
technical field [0001] The invention relates to the technical field of steel pipe manufacturing, in particular to a high-strength seamless steel pipe manufacturing process. Background technique [0002] Steel pipe production generally needs to go through the following steps: round tube billet, heating, perforation, extrusion, tube removal, annealing, cooling, straightening, hydraulic test, marking, and storage. It is not only the material that affects the strength of the steel tube. In fact, The annealing step also greatly affects the strength of the steel tube after final forming. Contents of the invention [0003] The purpose of the present invention is to solve the shortcoming of unreasonable annealing steps of steel pipes in the prior art that the steel pipe strength does not meet the requirements, and propose a high-strength seamless steel pipe manufacturing process. [0004] In order to achieve the above object, the present invention adopts the following technical s...
Claims
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IPC IPC(8): C21D9/08C21D1/32B21C37/06
CPCC21D9/08C21D9/085C21D1/32B21C37/06
Inventor 唐俊杰
Owner 衡阳鸿常机化有限公司