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Method for improving shape of 21mm-thick X70 pipeline steel plate
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A steel plate and pipeline technology, applied in the field of improving the shape of 21mm thick X70 pipeline steel plate, can solve the problems of poor shape of steel plate and high salvage amount
Inactive Publication Date: 2017-03-29
ANGANG STEEL CO LTD
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Problems solved by technology
[0002] The 21mm thick X70 steel plate produced by the 5500 rolling mill is poor in shape after controlled cooling, and the amount of salvage in the cold straightening process has remained high. All boards are at risk
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Embodiment 1
[0013] A method for improving the shape of 21mm thick X70 pipeline steel plate, the specific operation is as follows:
[0014] 1. The biting speed of the finishing mill is adjusted from 1.8m / s to 0.9m / s;
[0015] 2. The upper and lower water ratio of steel plate controlled cooling is controlled as 1:2;
[0016] 3. When hot straightening, set the roll gap at the entrance of the straightening machine to 18mm, set the roll gap at the exit to 23mm, and straighten for 2 passes.
Embodiment 2
[0018] A method for improving the shape of 21mm thick X70 pipeline steel plate, the specific operation is as follows:
[0019] 1. The biting speed of the finishing mill is adjusted from 1.8m / s to 0.9m / s;
[0020] 2. The upper and lower water ratio of steel plate controlled cooling is controlled as 1:1.9;
[0021] 3. When hot straightening, set the roll gap at the entrance of the straightening machine to 17mm, set the roll gap at the exit to 24mm, and straighten for 2 passes.
Embodiment 3
[0023] A method for improving the shape of 21mm thick X70 pipeline steel plate, the specific operation is as follows:
[0024] 1. The biting speed of the finishing mill is adjusted from 1.8m / s to 0.9m / s;
[0025] 2. The upper and lower water ratio of steel plate controlled cooling is controlled as 1:2.1;
[0026] 3. When hot straightening, set the roll gap at the entrance of the straightening machine to 16mm, set the roll gap at the exit to 23mm, and straighten for 1 pass.
[0027] The shape parameters of the 21mm thick X70 pipeline steel plate corresponding to Embodiment 1-3 are shown in the following table:
[0028]
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Abstract
The invention relates to a method for improving the shape of a 21mm-thick X70 pipeline steel plate. The method comprises concrete operation steps: 1, adjusting the bite speed of a finishing mill at 0.9m / s; 2, controlling water supply and drainage ratio for controlled cooling within the range from 1 to 1.9 to 1 to 2.1; 3, setting parameters of a heat correctional machine during heat correction: an inlet roll gap is nominally thinner than the steel plate by 3-5mm, namely 16-18mm, an outlet roll gap is nominally thicker the steel plate by 2-3mm, namely 23-24mm and 1-2 passes are straightened. The unevenness of 21mm-thick X70 pipeline steel plate shape controlled by the above mode can reach 2-6mm / M so that the plate shape is qualified. The salvage rate of a cold correction process for the steel plate is decreased from 46% to 13%.
Description
technical field [0001] The invention relates to pipeline steel production, in particular to a method for improving the shape of a 21mm thick X70 pipeline steel plate. Background technique [0002] The 21mm thick X70 steel plate produced by the 5500 rolling mill is poor in shape after controlled cooling, and the amount of salvage in the cold straightening process has remained high. All boards are at risk. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for improving the shape of 21mm thick X70 pipeline steel plate, which can effectively improve the shape of the rolled plate. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] A method for improving the shape of 21mm thick X70 pipeline steel plate, the specific operation is as follows: [0006] 1. Adjust the biting speed of the finishing mill to 0.9m / s; [0007] 2. The ratio of upper and lower ...
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