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Plate shape control method for steel plate

A control method and steel plate shape technology, which is applied in the field of steel rolling technology, can solve the problems that cannot fully meet the actual requirements of the site, and achieve the effects of reducing the narrow head and tail defects, increasing the economic benefits of the enterprise, and reducing the spot rate

Inactive Publication Date: 2016-11-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current method of judging the use of 3T rolling based on the value of the width ratio cannot fully meet the actual requirements of the site.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The specification of a steel billet is 200×1800×4031mm, and the target rolling specification is 22×3265×20202mm. The specific calculation is as follows:

[0019] μ=(target length of steel plate / length of blank) / [(target width of steel plate / width of blank)-1] 2

[0020] =(20202 / 4031) / [(3265 / 1800)-1] 2

[0021] =7.6

[0022] Since μ≤20, the 3T rolling method of longitudinal rolling-horizontal rolling-longitudinal rolling is adopted. The measured width difference between the head and the middle of the steel plate after rolling is 15 mm, and there is no narrow head and tail of the steel plate.

Embodiment 2

[0024] The specification of a steel billet is 250×1800×3180mm, and the target rolling specification is 12×3095×36590mm. The specific calculation is as follows:

[0025] μ=(target length of steel plate / length of blank) / [(target width of steel plate / width of blank)-1] 2

[0026] =(36590 / 3180) / [(3095 / 1800)-1] 2

[0027] =22.2

[0028] Since μ>20, the 2T rolling method of longitudinal rolling-horizontal rolling is adopted. The measured width difference between the head and the middle of the steel plate after rolling is 20 mm, and there is no narrow head and tail of the steel plate.

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Abstract

The invention provides a method for controlling the shape of a steel plate. A three-level computer system is based on the squareness coefficient μ=elongation ratio / (elongation ratio-1) 2 =(target length of steel plate / length of blank) / [(target width of steel plate / width of blank)-1] 2 Calculate the μ value of the slab to be rolled: the secondary computer system selects the rolling strategy according to the μ value. If μ≤20, the 3T rolling method of longitudinal rolling-cross rolling-longitudinal rolling is adopted; if μ>20 , the 2T rolling method of vertical rolling-cross rolling is used. The invention can effectively improve the specification and shape of the steel plate, ensure the rectangular size of the steel plate, reduce the occurrence of narrow head and tail defects in the flame cutting process of the steel plate, reduce the spot rate of the steel plate size, and reduce the spot rate caused by the narrow head and tail of the steel plate from 0.16% to 0.03% %, thereby greatly improving the qualified rate of steel plate quality, reducing spot losses and increasing the economic benefits of enterprises.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for controlling the shape of a hot-rolled strip that can avoid narrow head and tail defects during flame cutting. Background technique [0002] In the actual production process of the fire-cutting process of the thick plate 5500 production line of a factory, after the spot stock of Q345GJC steel plate with narrow head and tail in batches, the situation of narrow head and tail of ALK490 steel plate in batches of furnace shell steel appeared. The 3T rolling strategy of longitudinal rolling-cross rolling-longitudinal rolling is adopted for steel plates with a thickness of 40mm and above and a width ratio greater than 1.7, but the width ratio of this type of steel plate has not reached the width ratio required by 3T rolling. Through technical analysis, The degree of squareness of the steel plate is formed by the joint action of the width ratio an...

Claims

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Application Information

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IPC IPC(8): B21B37/28
Inventor 乔馨王若刚潘凯华李新玲于金洲李丰王亮亮应传涛张坤罗军
Owner ANGANG STEEL CO LTD
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