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A Rolling Method for Improving Yield of Wide and Heavy Plates

A technology for wide and thick plates and good yield, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of reducing the control accuracy of the MAS rolling method and the asymmetry of the head and tail of the steel plate

Active Publication Date: 2018-08-31
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the total number of rolling passes is not restricted by parity, and there will be asymmetry between the head and tail of the steel plate
For the rolling method of RS=4, the parity of the total number of longitudinal rolling passes and the total number of transverse rolling passes is not limited, the direction of steel transfer is not limited, and the parity of the total number of longitudinal rolling passes is not limited, which may easily cause sickle on the steel plate No parity restriction on the total number of transverse rolling passes will result in asymmetry of the head and tail of the steel plate; since MAS rolling is only used in the longitudinal rolling pass, the sickle bend of the steel plate in the longitudinal rolling pass will greatly reduce the control of the MAS rolling method Accuracy; the direction of two steel rotations has no effect on the shape of the head and tail of the steel plate

Method used

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  • A Rolling Method for Improving Yield of Wide and Heavy Plates
  • A Rolling Method for Improving Yield of Wide and Heavy Plates
  • A Rolling Method for Improving Yield of Wide and Heavy Plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: Q345B low-alloy high-strength steel plate;

[0021] Billet size: 260×2070×3000mm; steel plate size: 50×3330×8000mm;

[0022] Rolling method: RS=0;

[0023] Width ratio: 1.61;

[0024] MAS depth of forming pass: 3.4mm, MAS depth of widening pass: 0mm.

[0025] The rolling method is specifically shown in Table 1 below:

[0026] Table 1:

[0027]

[0028]

[0029] Conclusion: by Figure 2A It can be seen from and B that the edge of the steel plate produced by the conventional setting is asymmetrical, the Z side of the steel plate is slightly convex, and the Y side is slightly concave, and the steel plate is prone to camber during the subsequent rolling process. The W end of the steel plate is in a slightly convex arc, and the T end is in a slightly concave arc, that is, the W of the steel plate is slightly tongue-shaped, and the T end is slightly fishtail. However, when the arrangement of the present invention is adopted, the two sides, the head...

Embodiment 2

[0030] Embodiment two: LR-A32 ship plate;

[0031] Billet size: 260×2070×2903mm; steel plate size: 50×2860×10920mm;

[0032] Rolling method: RS=1;

[0033] Widening ratio: 1.38;

[0034] No forming pass, widening pass MAS depth: 2.4mm.

[0035] The rolling method is specifically shown in Table 2 below:

[0036] Table 2:

[0037]

[0038]

[0039] Conclusion: by Figure 3A It can be seen from and B that there is asymmetry in the edge of the steel plate produced by the conventional setting, and the Y side and the Z side of the steel plate are slightly convex arcs, but the arc convex value of the Y side is slightly larger than that of the Z side. There is asymmetry in the head and tail of the steel plate, the T end is slightly convex arc, and the W end is straight. However, when the arrangement of the present invention is adopted, the two sides, the head and the tail of the steel plate are symmetrical, the trimming value is reduced, and the finished product rate is in...

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Abstract

The invention belongs to the technical field of steel rolling, and relates to a rolling method capable of increasing the rolling yield of wide and thick plates. By limiting the odevity of the total longitudinal rolling pass number, the odevity of the widening pass number and the steel turning direction, dissymmetry and edge camber of head and tail arcs of the wide and thick plates can be controlled, and therefore the heads, tails and two sides of the rolled wide and thick plates can be made symmetrical, and the rolling yield of the wide and thick plates can be increased by 0.2%-0.6%.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a rolling method for improving the yield of wide and thick plates, in particular to a rolling method for controlling the yield of wide and thick plates in planar shape of steel plates by limiting the steel transfer mode and the number of rolling passes. Background technique [0002] For wide and thick plates, due to the poor plane shape of the steel plate, the yield will be greatly reduced. Among them, the MAS rolling method is a common plane shape control method, which can effectively improve the yield of wide and thick plates. However, for single-pass rolling of wide and thick plates, the forward slip value is smaller than the rear slip value, and the macroscopic phenomenon manifested on the steel plate is: the asymmetrical arcs at the head, tail and edge of the steel plate make the control accuracy of the MAS rolling method reduce. In addition, in the rolling process of w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B37/18B21B37/22
CPCB21B1/22B21B37/18B21B37/22
Inventor 黄贞益廖仕军陈富强汪杰杜海军张朋彦张龙张丽娜
Owner NANJING IRON & STEEL CO LTD
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