Method for reducing occurrence frequency of coiling scratches of hot-dip galvanized panel
A frequency of occurrence, hot-dip galvanizing technology, used in manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of poor surface scratches on cold-rolled galvanized panels, eliminate scratches, prevent scratches, etc. The effect of loosening and reducing energy consumption
Pending Publication Date: 2022-07-29
武汉钢铁有限公司
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Problems solved by technology
Surface scratches of cold-rolled galvanized panels with high surface quality requirements are not targeted
Method used
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[0013] The present invention will be further described in detail below in conjunction with specific embodiments and comparative examples, so as to facilitate a clearer understanding of the present invention, but they do not limit the present invention.
[0014] Coils are hot rolled, cold rolled, galvanized and then coiled to produce high surface quality hot-dip galvanized panels. The distribution principle of the additional tension value of the head of the galvanizing unit is shown in Table 1, and the relationship between the specific tension value of the finishing unit and the thickness of the strip is shown in Table 2.
[0015] Table 1
[0016]
[0017] Table 2
[0018]
[0019] From Examples 1 to 6, it can be seen that the rate of correction of scratches in strip coiling is greatly reduced. It can be considered that under the tension optimization process set in the present invention, the hot-dip galvanized panel hardly appears again under full-load production conditi...
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Abstract
The invention discloses a method for reducing the occurrence frequency of coiling scratches of a hot-dip galvanizing panel, which comprises the following steps of: increasing additional tension at the head of strip steel on the basis of steady-state tension when the strip steel is offline from a galvanizing unit, and gradually reducing the additional tension to return to the steady-state tension when the strip steel is coiled to the middle part; and when the strip steel is coiled to the tail of the strip steel, the stable tension is kept unchanged, and coiling is continuously carried out until completion. By optimizing the tension and specific tension process of the galvanization and finishing unit and adjusting the finishing acceleration, interlayer dislocation is avoided in the strip steel uncoiling process, the inner ring of the steel coil is effectively prevented from loosening, the steel coil is rarely scratched or is not scratched at all in the uncoiling process, and therefore the scratch defect is eliminated, and the production efficiency is improved. The purposes of improving the product quality, reducing the energy consumption, improving the production efficiency and reducing the cost are achieved.
Description
technical field [0001] The invention relates to the technical field of hot dip plating, in particular to a method for reducing the frequency of coiling scratches on hot dip galvanized panels. Background technique [0002] The problem of scratches has always been a major technical problem that plagues the quality and yield of cold-rolled products. Before the finishing unit is uncoiled, there is a visible gap of 1 to 2 mm within the inner diameter of 5 to 10 circles. After uncoiling, the coil is loosened (longitudinal scratches) from the inner diameter along the rolling direction of 700 to 800 m (longitudinal scratches), and can reach about 1000 m in severe cases. Accompanied by the lateral slip of the coil (lateral scratches). Over the years, many beneficial attempts have been made to overcome this technical problem, but none of them have been able to solve the problem fundamentally. [0003] At present, the solution of scratches during uncoiling can reduce the degree of di...
Claims
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IPC IPC(8): B21C47/34B21C47/02B21B15/00
CPCB21C47/34B21C47/345B21C47/02B21B15/00B21B2015/0057
Inventor 方芳周文强谭文周诗正
Owner 武汉钢铁有限公司