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Method for reducing cutting loss of wide and thick plates

A technology for wide and thick plates and steel plates, which is applied in the field of reducing the shear loss of wide and thick plates, can solve the problems that the shape of the head, tail and edge of the steel plate is not optimized, and the shape of the head, tail and edge is large, and achieves significant economic benefits. The effect of improving the yield and reducing the cutting loss

Active Publication Date: 2017-01-11
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 shape of the head, tail and edge of the steel plate has not been optimized, that is, the head, tail and edge of the finished steel plate are slightly convex, straight or slightly concave, and the cutting loss value of this kind of head, tail and edge shape is still relatively large

Method used

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  • Method for reducing cutting loss of wide and thick plates
  • Method for reducing cutting loss of wide and thick plates
  • Method for reducing cutting loss of wide and thick plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Q690D high-strength board;

[0026] Billet size: 260×2070×2792mm; order size: 25×2500×21600mm;

[0027] Rolling method: vertical-horizontal-longitudinal;

[0028] Width ratio: 1.23;

[0029] The method flow is as follows Figure 4 As shown, the specific steps are as follows:

[0030] Initial conditions: the step height h of the rolled piece after the forming pass MAS rolling is 2.6mm, and the step height h of the rolled piece after the widening pass MAS rolling is 3.0mm.

[0031] After rolling, the plane shape detection device on the shearing line detects the plane shape of the steel plate after rolling and obtains the plane shape data of the steel plate. The steel plate data fed back is: the actual size of the steel plate is 25×2533×23195mm, and the fishtail of the steel plate head is concave The value at is -40mm, and the concave value aw of the tail of the steel plate is -20mm, and the concave value a of the fishtail at the head and tail of the stee...

Embodiment 2

[0036] Embodiment 2: S355J low carbon structural steel plate;

[0037] Billet size: 260×2070×2792mm; order size: 35×3500×11000mm;

[0038] Rolling method: vertical-horizontal-longitudinal;

[0039] Width ratio: 1.74;

[0040] The method flow is as follows Figure 4 As shown, the specific steps are as follows:

[0041] 1. Initial conditions: the step height h of the rolled piece after the forming pass MAS rolling is 4.2mm, and the step height h of the rolled piece after the widening pass MAS rolling is 0.2mm.

[0042] 2. The plane shape detection device on the shearing line after rolling detects the plane shape of the steel plate after rolling and obtains the plane shape data of the steel plate. The steel plate data fed back is: the actual size of the steel plate is 35×3650×11760mm, the head of the steel plate is fishtail The concavity value at is 0mm, the concavity value aw of the tail of the steel plate is -10mm, and the concavity value a of the fishtail at the head and t...

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Abstract

The invention relates to a method for reducing cutting loss of wide and thick plates. The edge cutting amount of steel plates can be reduced effectively by reasonably controlling values of head tails and fish tails of the steel plates and the recessed values of edges, so that the yield of the wide and thick plates is improved. Compared with the prior art, the method for reducing the cutting loss of the wide and thick plates has the advantages that the cutting loss of the steel plates is reduced obviously after the method is used, and the yield of each steel plate can be increased by about 0.2%-0.7%.

Description

technical field [0001] The invention belongs to the technical field of wide and thick plate rolling, and specifically relates to a method for reducing cutting loss of wide and thick plates. Background technique [0002] In the rolling process of wide and thick plates, the cutting loss of the steel plate accounts for about 26.0% of the total loss, and the cutting edge loss of the steel plate accounts for about 23.0% of the total loss. It can be seen that the cutting loss of wide and thick plates accounts for about 49.0% of the total loss. However, the quality of the planar shape of the wide and thick plate determines the size of its shear loss value, which directly reflects its yield; therefore, the yield can be improved by controlling the planar shape of the steel plate. There are many factors affecting the planar shape of wide and thick plates (the present invention is only aimed at MAS planar shape control rolling), mainly including: rolling method, MAS control precision,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/16B21B37/72
CPCB21B37/16B21B37/72
Inventor 陈富强黄贞益廖仕军汪杰张朋彦郑明哲王玉娇王翊然
Owner NANJING IRON & STEEL CO LTD
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