Method for effectively controlling horizontal-edge crack of medium-thickness plate
A technology of transverse and edge cracking, applied in the field of steelmaking-steel rolling
Active Publication Date: 2013-11-27
SHOUGANG CORPORATION
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Problems solved by technology
[0003] The purpose of the present invention is to provide a method for effectively controlling the transverse edge crack defects of medium and thick plates, which solves the common quality problems of medium and thick plates, and greatly improves the surface quality of steel plates. Effectively control quality problems caused by transverse edge cracks, while reducing production costs and economic losses
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[0015] The technological process is: molten steel smelting→continuous casting→slab quality inspection→heating→rolling→finishing→steel inspection; the following technical parameters are controlled in the process:
[0016] (1) Ensure that the arc and roll gap accuracy of the caster segment is within ±0.5mm, ensure the state of the caster during the casting process of the billet, and reduce the mechanical stress on the cast billet.
[0017] (2) Ensure the protective casting of the casting machine and control the nitrogen increase below 5 ppm.
[0018] (3) The width of the billet is precisely controlled, and the width is controlled between -10 and 15mm.
[0019] (4) In the steel rolling process, the temperature of the steel billet is controlled between 1160 and 1300°C.
[0020] (5) The aspect ratio is between 1.15 and 2.1, and the trimming amount corresponding to different aspect ratios is different, and the single-side trimming allowance is controlled between 38mm and 63mm.
[0021] (6) The...
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The invention relates to a method for effectively controlling the horizontal-edge crack of a medium-thickness plate, which belongs to the technical field of steel making-steel rolling. The controlled process parameters are as follows: in the continuous-casting process, the accuracy of a roll gap of a base arc at the sector-shaped section of a continuous casting machine is controlled within the range from -0.5mm to 0.5mm; for guaranteeing that the casting of the casting machine is protected, the nitrogen adding amount is controlled to be below 5ppm; and the width size deviation of a steel blank is controlled between minus 10mm and 15mm. In the steel-rolling process, the discharging temperature of the steel blank is controlled between 1160 DEG C and 1300 DEG C; for comparison of the width of the rolled steel plate and the steel blank, the spreading ratio is between 1.15 and 2.1, the trimming amounts corresponding to different spreading ratios are different, and the trimming allowance of a single edge is controlled between 38mm and 63mm; and for comparison of the thickness of the steel blank and the thickness of the steel plate, the compression ratio is more than 5-25. The method has the advantages that the occurrence rate of the horizontal-edge crack of the medium-thickness plate in the production process can be effectively controlled to be below 0.3%.
Description
Technical field [0001] The invention belongs to the technical field of steelmaking and steel rolling, and particularly relates to a method for effectively controlling lateral edge cracks of medium and thick plates. Background technique [0002] The edge crack defects of medium and heavy plates are usually cracks where the edge of the steel plate is at an angle to the rolling direction. This kind of crack occurs during the production process of the steel billet. The rolling process continues to develop and crack at the edge of the steel plate. After steelmaking and rolling Process optimization, control the generation of transverse cracks at the corners of the billet, and avoid the generation of transverse edge cracks on the steel plate. For the billets that have already experienced transverse cracks at the corners, they can be classified according to the law of crack extension, so that the treatment of billet corner defects is efficient and effective It is beneficial to reduce pro...
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IPC IPC(8): B21B1/30B21B37/56B21B37/74
Inventor 张会祥江东才郑翠军李秋万潇韦耀环王玉龙王臻明周金明王健慕文杰赵旭李涛赵晶白占禄
Owner SHOUGANG CORPORATION