Production method for improving rolling stability of thick-specification pipeline steel
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A production method and technology for pipeline steel, applied in metal rolling, temperature control, etc., can solve the problems of mismatched production process, large speed variation, unstable performance, etc., to improve market competitiveness, uniform performance, and qualified coiling The effect of rate increase
Inactive Publication Date: 2020-12-11
RIZHAO STEEL HLDG GROUP
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[0008] The technical task of the present invention is to provide a production method for improving the rolling stability of thick-gauge pipeline steel in view of the deficiencies in the prior art above, and solve the problems of mismatching existing production processes, large speed variables, large temperature fluctuations, and unstable performance. question
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Embodiment 1
[0042] 1. For 15.9mm X65M pipeline steel, the slab thickness is 227mm, the slab reheating temperature is controlled at 1190°C, the strip surface temperature difference is ≤30°C, and the heating time is 210min. The components of the continuous casting slab are: C: 0.07%, Si: 0.20%, Mn: 1.42%, Nb: 0.048%, Ti: 0.023%, and the balance is Fe and unavoidable impurities.
[0043] 2. The starting temperature of rough rolling is 1070°C, 5 rolling passes are adopted, the reduction rate of each pass is 24%, 26%, 25%, 25%, 26%, the thickness of the intermediate billet is 52mm, and the rolling and descaling are fully opened. The temperature of rough rolling and final rolling is controlled at 1000°C, and the rolling speed is 4.0-4.2m / s.
[0044] 3. The starting temperature of finish rolling is 960°C, the finish rolling is seven-stand hot continuous rolling, F2 and F5 are assumed as false, and the reduction rate of each pass is 31%, 0%, 34%, 24%, 0%, 16%, 8%, and the final rolling temperatu...
Embodiment 2
[0048] 1. For 19.1mm X60M pipeline steel, the slab thickness is 227mm, the slab reheating temperature is controlled at 1250°C, the strip surface temperature difference is ≤30°C, and the heating time is 190min. The components of the continuous casting slab are: C: 0.08%, Si: 0.20%, Mn: 1.39%, Nb: 0.042%, Ti: 0.021%, and the balance is Fe and unavoidable impurities.
[0049] 2. The starting temperature of rough rolling is 1110°C, 5 rolling passes are adopted, the reduction rate of each pass is 23%, 24%, 25%, 24%, 25%, the thickness of the intermediate billet is 55mm, and the rolling and descaling are fully opened. The temperature of rough rolling and final rolling is controlled at 1040°C, and the rolling speed is 4.0-4.2m / s.
[0050] 3. The starting temperature of finish rolling is 1000°C, the finish rolling is seven-stand hot continuous rolling, F2 and F5 are assumed as false, and the reduction rate of each pass is 27%, 0%, 25%, 20%, 0%, 15%, 9 %, the final rolling temperature i...
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Abstract
The invention discloses a production method for improving the rolling stability of thick-specification pipeline steel. The production method comprises the following steps including plate blank heating, rough rolling, finish rolling, cooling after rolling and coiling, in the plate blank heating step, the in-furnace time is 170-230 min, and the heating temperature is 1,190 DEG C-1,250 DEG C; in therough rolling step, the rough rolling biting temperature is 1,070-1,110 DEG C, five passes are adopted for rough rolling of a plate blank, the accumulated reduction rate is 60-80%, the final pass speed of rough rolling is 4.0-4.3 m/s, and the final rolling temperature of rough rolling is controlled to be 1,000-1,040 DEG C; in the finish rolling step, the temperature of a finish rolling inlet is controlled to be 960-1,000 DEG C, finish rolling is seven-rack hot continuous rolling dummy F2 and F5, and the accumulated rolling reduction is larger than or equal to 60%; the final rolling temperatureis 810-850 DEG C; after threading, the acceleration is set to be 0.003-0.008 m/s <2>; and the cooling after rolling is laminar cooling, a front-section cooling mode is selected, the cooling speed is15-30 DEG C/s, and the final cooling temperature is controlled to be 500-550 DEG C. Compared with the prior art, the rolling stability of thick-specification pipeline steel of a conventional hot continuous rolling production line can be obviously improved.
Description
technical field [0001] The invention belongs to the technical field of pipeline steel preparation methods, in particular to a method for controlling the rolling of thick-gauge pipeline steel suitable for conventional hot continuous rolling production lines. Background technique [0002] Oil pipeline steel is mainly used for pipelines for transporting oil and natural gas, especially natural gas pipelines are under high operating pressure, which requires high toughness of pipeline steel. Pipeline construction is developing in the direction of large wall thickness and high strength and toughness, which can increase the pipeline transmission pressure and greatly improve the efficiency of natural gas transmission. However, as the thickness of the steel plate increases, its production difficulty increases sharply. [0003] The process of thick gauge pipeline steel (15-25mm) requires low final rolling temperature (810-850°C) and low coiling temperature (500-550°C). The hit rate o...
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