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

A production method and technology of occurrence rate, which is applied in the field of steel material forming and control, can solve the problems of great impact on the yield rate and contract fulfillment rate, downgrade and change of judgment, etc., to improve the edge temperature field, reduce the amount of billet, and save production time Effect

Active Publication Date: 2019-08-02
NANJING IRON & STEEL CO LTD
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  • Claims
  • Application Information

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

Method used

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

Examples

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Effect test

Embodiment 1

[0026] This example provides a production method for reducing the incidence of wide plate edge folding, structural steel plate S355J, blank size: 260×2070×2792mm; order size: 25×3910×12000mm;

[0027] Rolling method: vertical-horizontal-longitudinal; width ratio: 1.88; the continuous casting billet adopts a large chamfered 34° crystallizer to draw steel, which effectively weakens the two-dimensional cooling of the right-angle billet, improves the temperature uniformity and strain resistance of the corner, After the billet leaves the continuous casting section, perform secondary chamfering, the chamfering pressure is 70bar, and the chamfering size is 15mm, such as figure 2 As shown; the first pass of the rolling process is forming rolling, and after the forming is completed, widening rolling is carried out. There are four widening passes, and the reduction rates are 8%, 9%, 8%, and 8%. Longitudinal rolling and phosphorus removal are the first, fifth and sixth passes respective...

Embodiment 2

[0033] This example provides a production method for reducing the occurrence of wide plate edge folding, high-strength steel Q690, blank size: 260×2570×2792mm; order size: 25×4210×12000mm;

[0034] Rolling method: vertical-horizontal-longitudinal; width ratio: 1.63; the continuous casting billet adopts a large chamfered 34° crystallizer to draw steel, which effectively weakens the two-dimensional cooling of the right-angle billet, improves the temperature uniformity and strain resistance of the corner, After the billet leaves the continuous casting section, the second chamfering is carried out. The chamfering pressure is 80bar, and the chamfering size is 13mm; 9%, 9%, 8%, and 8%, respectively. After the end of the widening, full longitudinal rolling is carried out, and the phosphorus removal is the first, fifth, and sixth passes;

[0035] Pre-straightening is carried out after rolling, and ultra-fast cooling is carried out. After the steel plate reaches the cooling bed, warm s...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B1/38B21B1/46
CPCB21B1/38B21B1/466B21B2001/386B21C37/02
Inventor 翟冬雨吴俊平方磊姜金星赵显鹏王凡黄灿王光磊杜海军员强鹏殷杰
Owner NANJING IRON & STEEL CO LTD
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