Cooling method for producing X80M pipeline steel by adopting multi-stage cooling process
A cooling process and cooling method technology, applied in temperature control and other directions, can solve problems such as large differences in performance between head, middle and tail, achieve uniform structure and performance, stable and controllable cooling process, and promote product quality improvement.
Active Publication Date: 2022-07-01
SD STEEL RIZHAO CO LTD
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Problems solved by technology
[0006] Aiming at the problems in the prior art such as the large difference in performance between the head, middle and tail of high-grade pipeline steel plates, the present invention provides a cooling process for producing X80M pipeline steel using a multi-stage cooling process. method to solve the above problems
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Embodiment 1
[0026] 1. Ingredient Design
[0027] X80M pipeline steel has high strength requirements, the lower limit of yield strength is required to be 555MPa, and the low temperature toughness is required to be high. Considering the strength and toughness requirements of the steel plate, a low PCM composition system is adopted, and alloying elements such as Nb, Cr, Mo, Cu, Ti are added. Mn: 1.65%~1.75%, P≤0.012%, S≤0.003%, Cu: 0.15%~0.17%, Nb: 0.055%~0.065%, Cr: 0.16%~0.18%, Mo: 0.15%~0.17%, Ti: 0.02% to 0.03%, PCM≤0.23%, and the balance is Fe.
[0028] 2. The production steps are as follows:
[0029] KR desulfurization→converter smelting→LF→RH→CCM→slab cutting to length→slow cooling 48h→slab heating→high pressure water descaling→rolling→multi-stage cooling→straightening→flaw detection→cutting→inspection, spray number→ Inventory.
[0030] 3. Rolling process control
[0031] After slow cooling for 48 hours, the billet is reheated and rolled. The temperature of the billet is controll...
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Abstract
The invention relates to a cooling method for producing X80M pipeline steel by adopting a multi-stage cooling process, and belongs to the technical field of controlled rolling and controlled cooling in steel rolling production. The method specifically comprises the following steps: (1) component design; (2) rolling process control; (3) multi-stage cooling process control; the multi-stage cooling process control comprises the following steps: (i) first-stage air cooling; (ii) second-stage gap cooling; (iii) carrying out third-stage laminar cooling; and (iv) fourth-stage secondary air cooling. The multi-stage cooling process is stable and controllable, and large-scale batch production of the X80M pipeline steel is facilitated; the adopted multi-stage cooling process is suitable for production of X80M pipeline steel with multiple thickness specification ranges of 10-25 mm, and universality is achieved; and meanwhile, the produced X80M pipeline steel is uniform in structure and performance, and the problem that the performance of a steel plate is not uniform when a controlled rolling and controlled cooling process is used for production is effectively solved.
Description
technical field [0001] The invention belongs to the technical field of controlled rolling and controlled cooling in steel rolling production, and particularly relates to a cooling method for producing X80M pipeline steel by adopting a multi-stage cooling process. Background technique [0002] With the construction of more and more natural gas pipeline network projects, pipeline steel needs to serve in areas with high cold and complex geology and landforms. The harsh environment requires more stringent performance requirements for pipeline steel. Good comprehensive mechanical properties such as high strength, high and low temperature toughness are The basic requirements of pipeline steel design, as far as current engineering projects are concerned, X80M pipeline steel has become the mainstream product of major oil and gas transportation projects. [0003] Domestic high-grade pipeline steel is generally produced by the controlled rolling and controlled cooling (TMCP) process. ...
Claims
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IPC IPC(8): C22C38/02C22C38/38C22C38/20C22C38/22C22C38/28C21D8/02B21B37/74
CPCC22C38/02C22C38/38C22C38/20C22C38/22C22C38/28C21D8/0226C21D8/0263B21B37/74C21D2211/005C21D2211/002Y02P70/10
Inventor 朱士鹏李复磊汪鹏飞徐庆磊韩启彪孔雅房振业韩力强车金锋张同同蔡茗宇李东岳杨欣兴陈耀季伟烨
Owner SD STEEL RIZHAO CO LTD