Leveling method for cross break defects on surface of hot-rolled and acid-pickled plate

A hot-rolled pickling and leveling technology, applied in contour control and other directions, can solve the problems of time-consuming and laborious, high secondary flattening rate of strip transverse fold defects, reduce production costs, eliminate transverse fold defects on the strip surface, and achieve good results. control effect

Active Publication Date: 2016-01-27
BEIJING SHOUGANG CO LTD
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Problems solved by technology

[0005] The invention provides a method for leveling the transverse fold defect on the surface of a hot-rolled pickled plate, which solves the technical problems of high secondary leveling rate and time-consuming and labor-intensive technical problems in the prior art, and achieves the improvement of the leveling of the transverse fold defect Efficiency, the technical effect of simplifying the operation process

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  • Leveling method for cross break defects on surface of hot-rolled and acid-pickled plate

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Embodiment Construction

[0022] The embodiments of the present application provide a smoothing method for cross-fold defects on the surface of hot-rolled pickled sheets, so as to solve the technical problems of complex correction of cross-fold defects in the prior art, low efficiency, and high secondary smoothing rate; The leveling efficiency of defects, the technical effect of reducing costs.

[0023] In order to solve the above technical problems, the general idea of ​​the technical solution provided by the embodiment of the present application is as follows:

[0024] A method for smoothing the surface of a hot-rolled pickled sheet for cross-bending defects, comprising:

[0025] The hot-rolling skin pass unit is controlled by constant rolling force, and the skin pass + straightening mode is selected;

[0026] The segmented pressure control strategy of deep bending rolls is adopted, and the pressure of deep bending rolls is adjusted according to the cross-sectional area of ​​the strip;

[0027] Con...

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Abstract

The invention belongs to the technical field of steel making and discloses a leveling method for cross break defects on the surface of a hot-rolled and acid-pickled plate. The leveling method comprises the steps that constant-rolling-force control is adopted by a hot-roll leveling unit, and a leveling and straightening mode is selected; a strategy of segmented pressure control over a deep bending roller is adopted, and the pressure of the deep bending roller is adjusted according to the cross sectional area of strip steel; and the elongation of the strip steel is controlled to be 3%-3.5%. By the adoption of the leveling method for the cross break defects on the surface of the hot-rolled and acid-pickled plate, the cross break defects are effectively eliminated; meanwhile, leveling operation is simplified, the probability of secondary leveling is lowered, and thus the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for leveling cross-bending defects on the surface of a hot-rolled pickled plate. Background technique [0002] During the uncoiling process of hot-rolled pickled sheets, obvious cross-bending defects are prone to appear on the surface of the strip, especially for low-grade hot-rolled pickled sheets. The basic characteristics of cross-bending defects are: strip-shaped creases perpendicular to the rolling direction, which even run through the entire width of the plate in severe cases, and have obvious concave-convex feeling when touched by hand. This quality problem has seriously affected customers' use, and has become the key to restricting the development of hot-rolled pickled sheets to high-precision. [0003] The reason for cross-bending defects in low-grade hot-rolled pickled sheets when uncoiling is that the low-grade hot-rolled pickled sheets generally have a y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
CPCB21B37/28
Inventor 王凤美路统宪周剑飞张兴光李金保李彬王学强
Owner BEIJING SHOUGANG CO LTD
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