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Method for controlling strip steel edge cracking

A technology for controlling the edges of strips and steel strips, which is applied to rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of increasing labor intensity and production costs, and achieve the purpose of improving enterprise productivity and economic benefits, and improving edge Effect of reduction in quality and rolling waste

Inactive Publication Date: 2018-01-26
ANGANG STEEL CO LTD
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  • Abstract
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Problems solved by technology

In addition, in order to prevent strip breaking accidents caused by strip edge cracks in the rear continuous annealing unit, it is necessary to trim the strip through the tailor welding unit. Therefore, strip edge cracks not only limit the increase in product yield, but also Increased labor intensity and production costs, causing considerable economic losses to the enterprise

Method used

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Embodiment Construction

[0021] A method for controlling strip edge cracking according to the present invention is suitable for the cold rolling process of oriented silicon steel after normalization treatment; comprising:

[0022] 1) Shearing process before cold rolling;

[0023] Install a strip edge heater at the disc shear entrance of the normalization unit to heat the strip edge to above 50°C to improve the plasticity and toughness of the strip edge and eliminate or reduce the brittleness of the strip edge during shearing Generation of microcracks;

[0024] Adjust the side clearance of the disc scissors to 280-290 μm, and adjust the overlap to -380--390 μm to eliminate or reduce the generation and expansion of micro-cracks at the edge of the strip during the shearing process;

[0025] 2) Strip temperature control before cold rolling;

[0026] Before cold rolling, the strip temperature is controlled above 60°C. When the temperature is lower than this temperature, the steel coil is placed in a wate...

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Abstract

The invention relates to a method for controlling strip steep edge cracking. The method is suitable for the cold rolling process after oriented silicon steel normalizing treatment. The method includesthe steps that firstly, in the shearing process before cold rolling, heating is conducted on the edge portion of strip steel, and the disc shear blade side gap and the lap amount are adjusted; secondly, the strip steel temperature is controlled to be 60 DEG C or above before cold rolling; and thirdly, in the cold rolling process, the reduction rate, the rolling temperature, the deformation speed,tension and the work roller roughness in the first gate are controlled. The above measures are adopted so that the strip breaking phenomenon caused by edge cracking can be effectively reduced, the yield of a rolling mill is increased, the waste rolling amount and the edge reduction amount are reduced, and the oriented silicon steel edge portion quality and the product yield are increased.

Description

technical field [0001] The invention relates to the technical field of cold-rolled strip steel, in particular to a method for controlling edge cracking of strip steel. Background technique [0002] Due to the high silicon content in the raw material, the grain size of grain-oriented silicon steel is coarse, and the regular chemical treatment before rolling makes its brittleness, hardness significantly increased, and the sensitivity to edge cracking increases. When the steel strip is sheared by the disc of the normalization unit, micro-cracks will occur at the edge. During the rolling process, it is subjected to large plastic deformation and the combined stress of tension and bending to produce edge cracks and expansion. Severe strip edge cracks often cause rolling. Production accidents such as breaking belts, sticking rolls, and cutting rolls. In addition, in order to prevent strip breaking accidents caused by strip edge cracks in the rear continuous annealing unit, it is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B15/00
Inventor 朱丽君王晓峰林棡胡洪旭林勇苗晓雨
Owner ANGANG STEEL CO LTD
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