Method for cooling intermediate billet of medium-thickness plate by using equipment for cooling after rolling
A cooling equipment and post-rolling technology, applied in the field of metallurgy, can solve the problems of insufficient reservation of production lines and difficult construction, and achieve the effects of flexible adjustment of cooling capacity, improved efficiency, and improved temperature uniformity
Active Publication Date: 2015-03-11
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
[0005] This technology is applied to the cooling water of the rolling mill in the public water circulation system of the workshop. When it is applied, the on-site water system needs to be modified, the construction is difficult, and additional cooling equipment needs to be installed. There is often no sufficient space reserved on the production line. limit its use
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[0024] see figure 1 , The equipment used in the method of the present invention includes sequentially disposing a rolling mill 1, an ultra-rapid cooling equipment 2, a laminar cooling equipment 3, a straightening machine 4, and pyrometers 6, 7, 8, 9 on the rolling line. Taking the production of 50mm thick DH36 steel plate as an example, you can refer to the temperature change curve 10 at the 1 / 2 thickness of the intermediate billet, the temperature change curve 11 at the 1 / 4 thickness of the intermediate billet, the temperature change curve 12 on the surface of the intermediate billet, and different positions of the intermediate billet The speed change curve 13 of time can be understood. The steel billet is heated to 1200°C, and the billet is sent to the rolling mill 1 by the transfer roller table for rolling. The rolling at this time belongs to recrystallization rolling. After 3 passes of manual control rolling, the termination temperature of the intermediate billet 5 is cont...
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The invention relates to a method for cooling an intermediate billet of a medium-thickness plate by using equipment for cooling after rolling. Rolling equipment, ultra-rapid cooling equipment and laminar cooling equipment and a straightening machine are configured on a rolling line in sequence. The method comprises the following steps: removing phosphorus in steel billet heated to about 1,200 DEG C, and conveying the steel billet to the rolling machine through a conveying roller track to carry out multi-pass control rolling to produce the intermediate billet with a thickness of 50-120mm; (2) making the produced intermediate billet pass through the equipment for cooling after rolling, which comprises the ultra-rapid cooling equipment and the laminar flow cooling equipment, calculating the group number of water-cooling collecting pipes started for realizing target temperature decreasing and the speed of rollers by adopting the cooling controlling secondary program, wherein the cooling rate adjustment interval is 5-40 DEG C per second; (3) conveying the intermediate billet to a re-reddening pyrometer through the conveying roller track, wherein, the roller track rotates reversely and the intermediate billet moves reversely at the moment; (4) making the intermediate billet pass through a non-working cooling controlling area reversely, wherein the intermediate billet is not cooled at the moment; and (5) stopping the intermediate billet on the rolled roller to wait for the operation of the rolling machine. The original cooling system can be used for cooling without installing new cooling equipment and setting up pipes, and the problem of reconstruction is solved.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for realizing cooling of an intermediate slab of a medium-thick plate by using post-rolling cooling equipment. Background technique [0002] In order to improve the strength and toughness of steel, through controlled rolling, the austenite grains are refined or the dislocation slip bands inside the deformed austenite grains are increased, that is, the effective grain boundary area is increased, which is ferrite nucleation during phase transformation. Provide more and more dispersed nucleation sites, and obtain finely dispersed ferrite and pearlite or bainite structures. Refining ferrite grains can not only increase the strength of steel, but also improve the toughness of steel. However, the development of the traditional controlled rolling theory has not surpassed the three-stage controlled rolling technology, namely: rolling in the austenite recrystalliz...
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IPC IPC(8): B21B45/02
CPCY02P70/10
Inventor 袁国王昭东田勇王国栋李勇谢谦付天亮
Owner NORTHEASTERN UNIV LIAONING