Method for calculating length of head subcooling region and length of tail subcooling region in water cooling process of steel plate
A technology of supercooling zone and steel plate, applied in the direction of tail end control, temperature control, workpiece cooling device, etc., can solve the problem of inaccurate setting of the length of supercooling zone, achieve the effect of getting rid of one-sidedness, facilitating analysis and realizing data management
Active Publication Date: 2017-03-15
SHOUGANG CORPORATION
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[0003] The purpose of the present invention is to provide a method for calculating the length of the supercooling zone at the head and tail of the steel plate water cooling process, which solves the problem of inaccurate setting of the length of the supercooling zone of the water-cooled steel plate
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[0016] A method for calculating the length of the head-to-tail supercooling zone in the steel plate water cooling process, the steps are:
[0017] 1) Find the rolling process data of a certain steel type according to the secondary data of the rolling mill, such as Q345B, and collect the rolling force curve during the rolling process;
[0018] 2) According to the rolling force curve of the last rolling pass, take the length of time corresponding to the 10% difference between the rolling force of the head and tail rolling process and the stable rolling, for example, the rolling force curve of the last pass is 4000KN during stable rolling , while the rolling force at the head position of the rolled piece exceeds 10% for 0.3s;
[0019] 3) According to the speed curve of the rolling process, the rolling speed is 2m / s;
[0020] 4) Length L1 of the supercooled zone at the head = t*v=2*0.3=0.6m.
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The invention discloses a method for calculating the length of a head subcooling region and the length of a tail subcooling region in the water cooling process of a steel plate, and belongs to the technical field of medium and thick plate water cooling after rolling. The method comprises the steps that a final-pass rolling force curve of a rolled steel plate is detected; the rolling force curve is analyzed, and horizontal coordinate values corresponding to the positions where the rolling force generated in stable rolling fluctuates within the range of 10% to 15% are taken as a time demarcation point t1 and a time demarcation point t2; the length L1 of the head subcooling region and the length L2 of the tail subcooling region are calculated according to the formulas of L1=v*t1 and L2=v*t2. The method has the advantages that the lengths of the subcooling regions are judged through the rolling force curve without a temperature detection curve of a production line; the temperature of the whole steel plate can be taken into account, and data one-sidedness generated in single-point temperature detection is overcome.
Description
technical field [0001] The invention belongs to the technical field of water cooling after plate rolling, and in particular relates to a method for calculating the length of head and tail supercooling zones in the water cooling process of steel plates. The head and tail positions of the medium and heavy plate after rolling are seriously lowered in temperature, resulting in large fluctuations in rolling force. Therefore, the length of the head and tail supercooling zone before water cooling of the steel plate can be determined by the rolling force detection value of the rolling mill. Background technique [0002] In the current steel plate rolling process, in order to ensure the performance of high-quality steel plates, controlled cooling technology is widely used, and the length of cooled steel plates can reach 30 meters. Due to the different cooling boundary conditions and cooling time, the temperature difference between the head and tail and the middle of the steel plate i...
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IPC IPC(8): B21B37/72B21B37/74B21B45/02
CPCB21B37/72B21B37/74B21B45/0203
Inventor 路士平马长文顾林豪田鹏李群王海宝隋鹤龙张苏渊狄国标李少坡樊星辰
Owner SHOUGANG CORPORATION
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