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Method for controlling quality of edges of intermediate slabs

A control method and slab technology, applied in the direction of contour control, etc., can solve problems such as unseen technologies, and achieve the effects of ensuring edge quality, convenient use, and simple operation

Active Publication Date: 2011-11-23
BAOSHAN IRON & STEEL CO LTD
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  • Description
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  • Method for controlling quality of edges of intermediate slabs
  • Method for controlling quality of edges of intermediate slabs
  • Method for controlling quality of edges of intermediate slabs

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[0111] Strip No.: 008572480300

[0112] Slab thickness: 230mm, finished product thickness: 2.52mm

[0113] Slab width: 1100mm, finished product width: 1085mm, lateral pressure: 15mm (the lateral pressure is slab width mm-finished product width mm.).

[0114] According to above-mentioned data, in the concrete enforcement of the present invention, known strip steel finished product width is 1085mm, sets 3mm according to its width additional amount, so its rolling width is controlled by 1088mm, and the side pressure setting of finish rolling vertical roll Set the center, according to the reduction control of 3mm, the calculated natural width of the finish rolling is roughly 1mm, so the exit control of the rough rolling should be 1090mm, in the 3rd and 5th passes of the rough rolling, 3mm and The reduction of 8mm, and according to the calculation of the width of the rough rolling, the width is about 1mm, so the target width of the slab should be 1100mm. The following are the spec...

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Abstract

The invention discloses a method for controlling the quality of edges of intermediate slabs. Controlling equipment comprises a slab sizing press machine, a four-roll invertible roughing No.2 stand with a vertical roll and a finishing vertical roll. The method comprises the following steps: 1) according to the width of strip steel finished products, determining a finishing target width FET; 2) determining a finishing natural spread FS; 3) determining the maximum effective edging of the finishing vertical roll Wf; 4) according to values calculated in steps 1 to 3, obtaining a roughing outlet target width RET; 5) determining a roughing No.2 stand multi-pass natural spread alpha; 6) determining a roughing No.2 stand multi-pass total rolling reduction RW, and distributing a reduction gradient of each pass; 7) according to values calculated in steps 4 to 6, obtaining a slab target width WB; and 8) according to the value of the slab target width WB, setting the edging of the slab sizing press machine as 0, idling first two passes of the four-roll invertible roughing No.2 stand, and making the reduction gradient in subsequent passes gradually increased, wherein the finishing vertical rolladopts the maximum effective edging.

Description

technical field [0001] The invention relates to the technical field of hot rolling, in particular to a method for controlling the edge quality of strip steel. Background technique [0002] With the continuous development of hot-rolled high value-added products, for some special products, such as strip steel with a furnace temperature above 1350°C, due to the influence of high temperature, the strip steel at this time is relatively soft (generally hot-rolled The melting point of strip steel is at 1380-1420°C). For this type of strip steel, in the production process of hot rolling, it is found that there are certain defects in the rough rolling incoming material (intermediate slab). [0003] The specific strips involved are as follows: [0004] Preface No Strip No. Rolling specifications Edge case 1 7832370700 2.51*1100 The full-length edge cracks on both sides, the maximum crack depth is 28mm 2 7832371000 2.51...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/28
Inventor 解旗吴小弟荣鸿伟
Owner BAOSHAN IRON & STEEL CO LTD
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