Production method capable of reducing side part folding occurrence rate of wide plate

Abstract

The invention discloses a production method capable of reducing a side part folding occurrence rate of a wide plate, and relates to the technical field of steel material forming and control. Continuously-cast casting blank adopts big-chamfer crystallizer drawn steel, and the big-chamfer casting blank is subjected to secondary chamfering after a continuous casting section is discharged, wherein secondary chamfering pressure is set to be 70-80 bar, and a secondary chamfering dimension is 13-15 mm; according to a rolling schedule, a widening-pass single-pass pressing rate is set to be smaller than 10%, and phosphorous removal operation is not performed in a widening process; after forming pass and widening, phosphorous removal operation is a performed in fine-rolling pass; a widening ratio isgreater than 1.5 times, trimming amount of a rolled steel plate is greater than or equal to 80 mm, a widening ratio of all steel types is lower than or equal to 2.0 time; and a widening ratio is setto be lower than or equal to 1.8 times if the strength grade of the steel type is greater than 500 MPa, and trimming amount of the rolled steel plate is greater than or equal to 100 mm if a widening ratio is greater than 1.5 times. The production method solves the manufacturing defect of side part folding in a production process of an extra-wide steel plate.

Description

technical field [0001] The invention relates to the technical field of steel material forming and control, in particular to a production method for reducing the occurrence rate of edge folding of wide plates. Background technique [0002] The five-meter production line of the wide and thick plate factory mainly produces ultra-wide products. Since the maximum width of the smelted billet is less than three meters, the rolling process needs to be widened. There is a temperature difference in the internal temperature field. During the rolling process, the corner rollover produces folds, and the larger the width ratio, the farther the fold is from the edge. As the strength of the steel increases, the fold phenomenon becomes more obvious, and the edge shear If it is not clean, it will cause the steel plate to be downgraded and changed, which will have a great impact on the yield rate of the production process and the contract fulfillment rate. Through the analysis of the actual p...

AI Technical Summary

Problems solved by technology

[0002] The five-meter production line of the wide and thick plate factory mainly produces ultra-wide products. Since the maximum width of the smelted billet is less than three meters, the rolling process needs to be widened. There is a temperature difference in the internal temperature field. During the rolling process, the corner rollover produces folds, and the larger the width ratio, the farther the fold is from the edge. As the strength of the steel increases, the fold phenomenon becomes more obvious, and the edge shear If it is not clean, it will cause the steel plate to be downgraded and changed, which will have a great impact on the yield rate of the production process and the contract fulfillment rate

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