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Control Method of Head and Tail Width of Steel Plate with Large Span Ratio

A control method and a technology of the aspect ratio, applied in the direction of metal rolling stands, metal rolling mill stands, etc., can solve the problems of increasing vertical rolling mills, increasing equipment investment, etc. effect of value

Active Publication Date: 2015-08-26
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing Vertical Roller Will Increase Equipment Investment

Method used

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  • Control Method of Head and Tail Width of Steel Plate with Large Span Ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 steel type AH36

[0032] Continuous casting slab size: 200×1800×3040mm

[0033] Finished steel plate size: 8.25×4150×31000mm

[0034] PVPC (Plate Plane Shape Control) Mode in Roughing Mill: Manual Mode

[0035] Manual mode PVPC internal length a: 70% of total slab length

[0036] Manual mode PVPC external length b: 85% total slab length

[0037] Step depression depth h=2.3×(B / B′);

[0038] Forming pass rolling speed V=(b-a)×(V HGC / h) / 2

[0039] The specific rolling is as follows:

[0040] A total of 6 passes for rough rolling;

[0041] One pass in the forming stage, the reduction in the forming pass is 35mm, the step reduction depth in the forming pass is 5.3mm, and the rolling speed in the forming pass is 0.8m / s;

[0042] There are 4 rolling passes in the widening stage, and the rolling speed of each pass is 2.1m / s, 2.3m / s, 2.4m / s, 2.6m / s;

[0043] In the longitudinal rolling stage, one pass is rolled, and the rolling speed is 3.1m / s.

[0044] T...

Embodiment 2

[0053] Embodiment 2 steel type Q345E

[0054] Continuous casting slab size: 200×1500×3580mm

[0055] Finished steel plate size: 16×3200×21000mm

[0056] PVPC Mode in Roughing Mill: Manual Mode

[0057] Manual mode PVPC internal length a: 70% of total slab length

[0058] Manual mode PVPC external length b: 85% total slab length

[0059] Step depression depth h=2.3×(B / B′);

[0060] Forming pass rolling speed V=(b-a)×(V HGC / h) / 2

[0061] The specific rolling is as follows:

[0062] A total of 6 passes for rough rolling;

[0063] One pass in the forming stage, the reduction in the forming pass is 15mm, the step reduction depth in the forming pass is 4.9mm, and the rolling speed in the forming pass is 1.0m / s;

[0064] In the widening stage, there are 3 rolling passes, and the rolling speed of each pass is 2.4m / s, 2.6m / s, and 2.8m / s;

[0065] In the longitudinal rolling stage, there are 2 passes, and the rolling speed of each pass is 3.1m / s and 3.5m / s.

[0066] The diffe...

Embodiment 3

[0075] Embodiment 3 steel type Q345qD

[0076] Continuous casting slab size: 300×1800×3200mm

[0077] Finished steel plate size: 25×3600×19200mm

[0078] PVPC Mode in Roughing Mill: Manual Mode

[0079] Manual mode PVPC internal length a: 70% of total slab length

[0080] Artificial mode PVPC external length b: 85%

[0081] The step reduction depth of the total length of the slab h=2.3×(B / B′);

[0082] Forming pass rolling speed V=(b-a)×(V HGC / h) / 2

[0083] The specific rolling is as follows:

[0084] A total of 7 passes for rough rolling;

[0085] One pass in the forming stage, the reduction in the forming pass is 25mm, the step reduction depth in the forming pass is 4.6mm, and the rolling speed in the forming pass is 0.9m / s;

[0086] There are 4 rolling passes in the widening stage, and the rolling speed of each pass is 1.9m / s, 2.1m / s, 2.3m / s, 2.6m / s;

[0087] In the longitudinal rolling stage, there are 2 passes, and the rolling speed of each pass is 2.9m / s and 3....

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Abstract

The invention discloses a method for controlling the head-to-tail width of a high broadening ratio steel plate. The method comprises a forming step, an expanding step and a longitudinal rolling step, wherein in the forming step, the rolling pass is one, the rolling reduction is 15-35mm, the ladder reduction height h is calculated according to a formula that h=2.3*(B / B'); and the rolling velocity V is calculated according to a formula that V=(b-a)*(VHGC / h) / 2. According to the method, by controlling the rolling reduction, the ladder thickness curve and the rolling velocity of the rough rolling forming pass, when the high expansion ratio steel plate is rolled, the high rolling rhythm of a roughing mill is kept, the following features of the ladder thickness curve and the set curve in the forming step can be improved, and the difference between the head-to-tail width and the middle width of the high broadening ratio steel plate is reduced, so that the trimming amount of the edge of the steel plate is reduced and the yield of the steel plate is improved.

Description

technical field [0001] The invention belongs to the technical field of medium and thick plate rolling, and in particular relates to a method for controlling the head and tail width of a steel plate with a large aspect ratio. Background technique [0002] Medium and heavy plate is a steel plate with a thickness greater than 4mm. It has a flat shape and can be made into various products and structures through cutting, bending, stamping, welding and other processes. It can be used in shipbuilding, building components, machine manufacturing, transportation, military industry and other departments. , It can also be used to manufacture large-diameter welded pipes, containers and boilers. The raw materials of medium and heavy plates include blooming slabs, continuous casting slabs, and steel ingots. With the development of continuous casting steel technology, continuous casting slabs are used as raw materials, which can increase the yield, reduce production costs, and improve the q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/22
Inventor 秦港张长宏候刚单传东陶玲张兴锦张梅庞芳芳
Owner LAIWU IRON & STEEL GRP