Control method for laminar flow two-section type cooling of thick hot-rolled strip steel
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A technology of hot-rolled strip steel and a control method, which is applied in the field of iron and steel metallurgical hot-rolling, can solve the problems of low cooling efficiency in the second stage and low control precision of air-cooling time, and achieve the effect of increasing the cooling rate
Active Publication Date: 2021-06-01
SHANGHAI MEISHAN IRON & STEEL CO LTD
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[0009] The object of the present invention is to provide a control method for laminar two-stage cooling of thick-gauge hot-rolled strip steel, which mainly solves the control of intermediate temperature and air cooling time in the two-stage cooling process of hot-rolled strip steel with a thickness of 6.0-13.0mm Technical problems of low precision and low cooling efficiency in the second stage
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Embodiment 1
[0035] Embodiment 1, produce the SPFH590 of finished product specification 6.0*1150mm.
[0036] A control method for laminar two-stage cooling of thick-gauge hot-rolled strip steel, comprising the following steps:
[0037] 1) Finish rolling model, coiling temperature model receiving strip tapping mark, thickness 6.0mm, finish rolling end temperature 860°C, interlayer cooling target temperature 700°C, air cooling time 6s, coiling temperature 550°C and other two-stage cooling parameter command;
[0038] 2) The finish rolling model calculates the strip threading speed of 6.5m / s according to the strip thickness of 6.0mm and the finishing temperature of 860°C, and sends it to the coiling temperature model;
[0039] 3) The coiling temperature model is based on the strip threading speed of 6.5m / s, the two-stage cooling finish rolling end temperature of 860°C, the interlayer cooling target temperature of 700°C, the air cooling time of 6s, and the coiling temperature of 550°C, pre-cal...
Embodiment 2
[0050] Embodiment 2, the production of automotive structural steel SAPH4440 with a finished product specification of 10*1250mm is taken as an example.
[0051] A control method for laminar two-stage cooling of thick-gauge hot-rolled strip steel, comprising the following steps:
[0052] 1) Finish rolling model, coiling temperature model receiving strip tapping marks, thickness 10.0mm, finish rolling end temperature 850°C, interlayer cooling target temperature 680°C, air cooling time 8s, coiling temperature 580°C and other two-stage cooling parameter command;
[0053] 2) The finish rolling model calculates the strip threading speed of 3.0m / s according to the strip thickness of 10.0mm and the finishing temperature of 850°C, and sends it to the coiling temperature model;
[0054] 3) The coiling temperature model is based on the strip threading speed of 3m / s, the end temperature of two-stage cooling and finishing rolling at 850°C, the intermediate target temperature of layer cooli...
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Abstract
The invention discloses a control method for laminar flow two-section type cooling of thick hot-rolled strip steel. The control method mainly solves the technical problems that in the two-section type cooling process of hot-rolled strip steel with the thickness of 6.0-13.0 mm, the control precision of the middle temperature and the air cooling time is low, and the cooling efficiency of a second section is low. According to the control method for laminar flow two-section type cooling of the thick hot-rolled strip steel, cooling equipment on a rolling line is located on the rear side of a finishing mill and the front side of a coiling machine, the cooling equipment comprises 15 sets of headers including first cooling sections, a middle pyrometer, second cooling sections and fine adjustment cooling sections, and the control method comprises the steps that laminar flow two-section type cooling parameter instructions are received; the strip steel threading speed is calculated; a boiled water array of laminar flow two-section type cooling water is pre-calculated; the position of an initial valve of a first-section header of laminar flow two-section type cooling is determined; the laminar flow two-section type cooling water is opened; the cooling water of the first laminar flow cooling sections is dynamically adjusted; the middle air cooling time of laminar cooling is regulated and controlled; and the coiling temperature is regulated and controlled. According to the method, the production cost is reduced.
Description
technical field [0001] The present invention relates to a laminar flow cooling technology for hot strip steel, in particular to a control method for laminar two-stage cooling of thick gauge hot strip steel. The invention discloses a two-stage cooling control method for continuous hot-rolled strip steel by flow cooling equipment, and belongs to the technical field of iron and steel metallurgy hot rolling. Background technique [0002] Laminar two-stage cooling means that the cooling control area is divided into two areas, the front section and the back section. After finishing rolling, the strip steel enters the first section cooling area for water cooling to reach a certain intermediate temperature of layer cooling, and then air cooling for a period of time, and then A complex cooling process that enters the second cooling zone for water cooling to achieve the required target coiling temperature, that is, through the first water cooling + air cooling + second water cooling, ...
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