Hot rolling control method for X80 pipeline steel sheet billet
A control method and technology for steel slabs, which are applied in the direction of heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve problems such as no discovery, and achieve the effect of improving the problem of head warping, good effect, and improved shape after rolling.
Inactive Publication Date: 2019-03-19
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +1
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Problems solved by technology
At present, the TMCP process (ThermoMechanicalControlProcess: thermomechanical control process) is used in the hot rolling process, on the basis of controlling the heating temperature, rolling temperature and reduction of controlled rolling (ControlRolling), and then implements air cooling or controlled cooling and Accelerated cooling (Accelerated Cooling) technology, but how to reduce the strength fluctuation in the longer length range of the head and tail caused by rolling "black heads" and accelerated cooling under the TMCP process, it is necessary to increase the length of the cut to ensure the uniformity of the strength of the same plate. The study of the decline in the yield caused by it did not find that
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Embodiment 1～4
[0033] The finished product specification of the steel plate is 25.7×4360×12000mm, the second start rolling temperature of finish rolling is ≤900°C, the reduction ratios of the last three passes of finish rolling are 9.5%, 9.4% and 8.6% respectively, ACC cooling is adopted, and the total cooling length of ACC is It is 24 meters, and the process setting of the head cover is 6 meters, the water recovery distance is 5 meters, and the water cover is 90%, that is, the actual water volume after the cover is equivalent to 10% of the set value.
[0034] After ACC cooling, the combined straightening process of hot straightening + warm straightening is adopted to obtain finished steel plates.
[0035] The steel plate adopts the mode of two-fold ruler group plate, and table 1 is the yield situation of the steel plate of embodiment 1~4, and table 2 is the situation that the steel plate finished tensile property of embodiment 1~4 is poor with the plate; table 3 is embodiment The plate shap...
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Abstract
The present application discloses a hot rolling control method for a X80 pipeline steel sheet billet, wherein the hot rolling control method comprises a heating step, a rolling step and a cooling step; after the rolling step is finished, when the cooling step is carried out, the X80 pipeline steel sheet billet is cooled in an ACC (Accelerated Cooling) mode after head blocking, and a head blockingrange is controlled within 3m-6m of the head length of the X80 pipeline steel sheet billet, water blocking volume accounts for 1-95% of normal water volume, and the transition distance from the maximum water blocking volume to the normal water volume is controlled within 3m-10m. By the method of the present invention, the yield of the steel sheet is increased by 2%-3%, the performance and deviation of the steel sheet is controlled within 30 MPa, and the unevenness of the steel sheet is controlled at an excellent level of 3 mm / m, so that the shearing accuracy of the steel sheet is effectively improved, the problems of undesirable shearing and size miss of the steel sheet are obviously improved, and the shearing failure rate of the steel sheet is controlled within 0.1%.
Description
technical field [0001] The present application relates to the technical field of high-carbon steel continuous casting, and specifically relates to a method for controlling hot rolling of X80 pipeline steel slabs. Background technique [0002] Energy is an important basis for the sustainable development of the national economy. Natural gas is a low-carbon mineral energy. Expanding its proportion in my country's energy structure has important practical significance for ensuring my country's energy and protecting the ecological environment. As my country's eastern regions With the continuous development of the economy, the energy gap is gradually expanding, and the demand for natural gas resources is gradually expanding. Pipeline transportation is the most economical, efficient and environmentally friendly method of energy medium transportation. Key projects such as the "Third West-East Gas Pipeline", "Shaanxi-Beijing Fourth Line" and the China-Russia East Line under constructio...
Claims
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IPC IPC(8): C21D8/02C21D11/00
CPCC21D8/0205C21D8/0226C21D8/0263C21D11/00
Inventor 林涛铸聂文金张晓兵郭桐李冉郭志龙赵辉杨怀永
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD