Control method of hot-rolled steel sheet water-cooling plate
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A control method, technology of hot-rolled steel plate, applied in the direction of contour control, etc., to achieve the effect of solving the curvature
Inactive Publication Date: 2009-04-15
SHOUGANG CORPORATION
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem of water-cooled plate shape bending by technological means
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Embodiment 1
[0041] Example 1: A steel plate with a thickness of 22mm has a buckle under the whole plate, and the flow rate of the water-cooled upper header is 300L / m 2 .min, the height of the buckle is about 150mm, then adjust the water ratio, the adjustment amount is ΔR=0.0005*150+0.0015*22=0.108, because the steel plate is bent down, the water ratio should be reduced, the thickness specification 1. The raw water ratio under flow conditions is 1.92, which should be adjusted to R=1.92-0.108=1.812, and the other parameters remain unchanged.
[0042] If the warp only occurs at the head of the steel plate, then the R-water ratio is not adjusted, only the shielding amount of the head is adjusted, and the shielding coefficient adjustment amount is Δm=0.0002*150+0.0015*22=0.063, because what happens on the head is down The curvature of the buckle indicates that the cooling of the upper surface is insufficient, so the shading coefficient of the upper surface can be increased, or the upper surfac...
Embodiment 2
[0044] Example 2: Taking a steel plate with a thickness of 22mm as an example, when the flow rate of the upper header is 300L / m 2 .min, determined according to formula (1):
[0045] R=0.0149*22+0.33*Ln(300)-0.294=1.92
[0046] Therefore, the reasonable lower header flow rate should be 300*1.78=576;
[0047] In the same way, the flow rate of the upper header of the steel plate head is 0.8*300=240, the flow rate of the lower header of the head is 0.7*576=403, the flow rate of the upper header of the tail is 0.9*300=270, and the flow rate of the lower header of the tail is 0.8*576=461.
[0048] If the warp only occurs at the head of the steel plate, then the R-water ratio is not adjusted, only the shielding amount of the head is adjusted, and the shielding coefficient adjustment amount is Δm=0.0002*150+0.0015*22=0.063, because what happens on the head is down The curvature of the buckle indicates that the cooling of the upper surface is insufficient, so the shading coefficient...
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Abstract
The invention relates to a water cooled shape control method for a hot rolled steel plate. The top bottom water ratio and the head tail shielding parameter design and regulation process for the steel plate are determined by the heat exchange characteristic and the volume deformation feature during accelerated cooling process of the hot rolled steel plate. The quantitative relationship between the surface heat load of the steel plate and the flow rate of headers is established; and an upper and lower header initial water ratio function changing with the flow rate and thickness specifications is established based on the quantitative relationship. A reasonable lower / upper header flow ratio R is determined according to the functional relationship: R=0.0149xh+0.33Ln(F)-0.294. Therefore, the upper and lower surfaces of the steel plate are evenly cooled down by water. The technology is suitable for the after-rolling laminar flow water cooled shape technological parameter optimization of a medium and heavy plate and hot continuous rolling band steel, and can quickly and effectively solve the problem of water-cooled bend of the steel plate.
Description
technical field [0001] The invention relates to a method for controlling the water-cooled shape of a hot-rolled steel plate, which is a method for designing the cooling header water ratio for controlling the straight shape of the water-cooled steel plate, and quickly adjusting the water ratio of the header and the head-to-tail avoidance parameters determined according to the curvature characteristics. The method is especially suitable for the water ratio parameter design of the cooling header of medium and heavy plates and hot strip steel under the condition of laminar flow cooling. Background technique [0002] The water-cooled shape of hot-rolled steel plates has always been a difficult point in production process control, especially for wide and thick plates. When the final cooling temperature of the steel plate is low and the cooling intensity is high, it is difficult to keep the steel plate water-cooled flat. Deformation occurs on the cooling bed after completion, and s...
Claims
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