Steel pipe and on-line quenching method thereof
A steel pipe and quenching tank technology, applied to heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of long steel pipe production cycle, high energy consumption and cost, and achieve the effects of improving surface quality, saving heating time, and reducing surface oxidation
Active Publication Date: 2014-07-09
HENGYANG VALIN STEEL TUBE
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Problems solved by technology
[0004] The present invention aims to provide a steel pipe and its on-line quenching method to solve the problems of high energy consumption and long steel pipe production cycle in the prior art quenching method
Method used
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Embodiment 1
[0029] The steel pipe after rolling and sizing is directly transferred to the quenching tank. At this time, the temperature of the steel pipe is 850 ° C. The steel pipe is moved to the rotating idler by the pipe transfer mechanism, and the steel pipe is rotated under the drive of the rotating idler. At the same time Quickly fill the quenching tank with water, the steel pipe is submerged in water within 4s, and spray water to the inner wall of the steel pipe to cool while filling water, the water spraying speed is 3000m3 / h; after 200s, the steel pipe is cooled to 100°C, and the steel pipe is removed from the quenching tank. At the same time, drain the water in the quenching tank. Then temper at 500±10° C., keep warm for 3.5 hours and then air cool to obtain the steel pipe of Example 1.
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The invention provides a steel pipe and an on-line quenching method thereof. The on-line quenching method is that a high temperature steel pipe after rolling and sizing is subjected to quenching cooling treatment directly, and includes the following steps: turning the high temperature steel pipe directly to a quenching groove; rotating the steel pipe, and simultaneously, filling water into the quenching groove rapidly; completing quenching to obtain a quenching steel pipe when the temperature is reduced to 40 DEG C to 200 DEG C, and simultaneously, discharging the water in the quenching groove. According to the method, the steel pipe is subjected to quenching directly after rolling and sizing, secondary heating is avoided, temperature rising and preserving time is saved, production cycle of the steel pipe is reduced, and the productivity is expanded; energy consumption is reduced, equipment investment is reduced; surface oxidation of the steel pipe during the process of secondary heating is reduced, surface quality of the steel pipe is improved, strength and toughness of the obtained steel pipe are good, martensitic transformation happens to the rapidly cooling high temperature steel pipe at a cooling rate larger than a critical cooling rate, and quenching is finished.
Description
technical field [0001] The invention relates to the field of metallurgical heat treatment, in particular to a steel pipe and an online quenching method thereof. Background technique [0002] The production process of steel pipe includes billet heating → piercing → rolling pipe → reheating → sizing → cooling → finished product. In order to meet the requirements of relevant standards and obtain higher strength, better toughness and suitable structure of the steel pipe, it is necessary to perform quenching heat treatment on the steel pipe, heat the steel pipe above the corresponding temperature, keep it for a certain period of time, and then heat it at a certain speed Rapid cooling in water or oil to obtain martensite or bainite structure, so as to obtain steel pipe with higher hardness. [0003] The quenching treatment in the prior art is generally off-line quenching, that is, the steel pipes after rolling and sizing are not subjected to heat treatment, but are put into the p...
Claims
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IPC IPC(8): C21D1/18C21D9/08C21D8/10
Inventor 周勇贺国盛张业圣
Owner HENGYANG VALIN STEEL TUBE