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Method for improving rolling stability of high-strength IF steel

A stable and high-strength technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of F5 stand roll strain, large thickness fluctuation, strip thickness fluctuation, etc., to solve the problem of rolling The bottleneck problem of deviation, the reduction of roll strain accidents, and the effect of reducing the deviation rate of rolling

Active Publication Date: 2018-11-06
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In metallurgical enterprises, high-strength IF steel is usually cold-rolled by F1 to F5 five passes. The convexity is larger than that of ordinary steel and deep-drawing steel, and in the process of cold rolling, waves are easy to rise between stands, and the thickness of the strip steel fluctuates, resulting in strip cracking or roll strain accidents, and rolling instability
During the rolling process, the bending values ​​of the work rolls and intermediate rolls, and the roll shifting values ​​of the intermediate rolls are automatically adjusted using the secondary setting values ​​maintained by the production line control system, while the high-strength IF steel follows the secondary setting values ​​of other steels of the same strength. Fixed value parameters are used to control, and the stability of rolling cannot be guaranteed
According to statistics, the rolling deviation rate of high-strength IF steel reached 3.5%. At the same time, the severe side waves of the F4 frame caused the frequent occurrence of roll strain accidents on the F5 frame during the coil cutting of the strip steel, which caused serious problems for the stability of production. Great impact, which in turn affects the economic benefits of the enterprise

Method used

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  • Method for improving rolling stability of high-strength IF steel
  • Method for improving rolling stability of high-strength IF steel
  • Method for improving rolling stability of high-strength IF steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: When producing high-strength IF steel, grade HC250IF, the raw material thickness is 2.8mm, the finished product thickness is 0.8mm, and when the finished product width is 1500mm, adjust its rolling reduction distribution as shown in Table 1:

[0019] Table 1

[0020] frame

F1 frame

F2 rack

F3 rack

F4 rack

F5 rack

Absolute reduction rate%

38.1

30.2

20.5

10.4

0.8

[0021] F1~F3 use work rolls with a crown of 50-75um, and the roughness of F1 work rolls is controlled to 1.0-1.2Ra / um.

[0022] The roll shifting of the intermediate roll is set to 105% of the secondary set value, as shown in Table 2:

[0023] Table 2

[0024]

[0025] The roll bending value of the work roll and the intermediate roll is controlled at 10% to 30% of the set value of the second level, and rolling is carried out with a small bending force, as shown in Table 3 and Table 4:

[0026] table 3

[0027]

[0028] Table 4

[0...

Embodiment 2

[0031] Embodiment 2: when producing high-strength IF steel, grade HC250IF, raw material thickness is 3.3mm, finished product thickness is 1.2mm, and when finished product width is 1500mm, adjust its rolling reduction distribution as shown in table 5:

[0032] table 5

[0033] frame

F1 frame

F2 rack

F3 rack

F4 rack

F5 rack

Absolute reduction rate%

37.3

31.5

18.9

11.3

1.0

[0034] F1~F3 use work rolls with a crown of 50-75um, and the roughness of F1 work rolls is controlled to 1.0-1.2Ra / um.

[0035] The roll shifting of the intermediate roll is set to 105% of the secondary set value, as shown in Table 6:

[0036] Table 6

[0037]

[0038] The roll bending value of the work roll and intermediate roll is controlled at 10% to 30% of the secondary set value, and rolling is carried out with a small bending force, as shown in Table 7 and Table 8:

[0039] Table 7

[0040]

[0041] Table 8

[0042]

[0043] By adjust...

Embodiment 3

[0044] Embodiment 3: when producing high-strength IF steel, grade HC250IF, raw material thickness is 4.3mm, finished product thickness is 1.4mm, and when finished product width is 1500mm, adjust its rolling reduction distribution as shown in Table 9:

[0045] Table 9

[0046] frame

F1 frame

F2 rack

F3 rack

F4 rack

F5 rack

Absolute reduction rate%

36.2

29.8

18.4

14.4

1.2

[0047] F1~F3 use work rolls with a crown of 50-75um, and the roughness of F1 work rolls is controlled to 1.0-1.2Ra / um.

[0048] The roll shifting of the intermediate roll is set to 105% of the secondary set value, as shown in Table 10:

[0049] Table 10

[0050]

[0051] The roll bending value of the work roll and the intermediate roll is controlled at 10% to 30% of the set value of the second level, and rolling is carried out with a small bending force, as shown in Table 11 and Table 12:

[0052] Table 11

[0053]

[0054] Table 12

[0055] ...

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Abstract

The invention provides a method for improving the rolling stability of high-strength IF steel. Five F1-F5 cold rollings are adopted. Before rolling, rolling reduction allocation is adjusted to ensurethat the absolute reduction rate of an F2 rack is 80-85% of that of an F1 rack, and the absolute reduction rate of an F3 rack is 50-55% of that of an F1 rack. Working rollers of the F1-F3 racks are working rollers with convexity. Intermediate rollers have the roller shifting values that secondary set values are increased by 5-10%. The working rollers and the intermediate rollers have the roller bending values that are 10-30% of the secondary set values. Small-bending-force control is realized in a rolling process. The roller bending parameter can be adjusted within a wider space. After wave generation among the racks in the rolling process, plate shape adjustment can be rapidly performed. Stable rolling of strip steel is guaranteed. The operation is convenient. Rolling burst of strip steelor pulling scratch of the rollers are greatly reduced.

Description

technical field [0001] The invention relates to a method for improving the rolling stability of high-strength IF steel, and belongs to the technical field of cold-rolled strip rolling technology. Background technique [0002] With the rapid development of the automobile industry, higher requirements are put forward for the quality of automobile steel. High-strength IF steel is widely used because of its high strength and excellent deep drawing performance. In metallurgical enterprises, high-strength IF steel is usually cold-rolled by F1 to F5 five passes. The convexity is larger than that of ordinary steel and deep-drawn steel, and in the process of cold rolling, waves are easy to rise between the racks, and the thickness of the strip steel fluctuates, resulting in strip cracking or roll strain accidents, and rolling instability . During the rolling process, the bending values ​​of the work rolls and intermediate rolls, and the roll shifting values ​​of the intermediate ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B37/28
CPCB21B37/00B21B37/28B21B2263/06B21B2267/10B21B2267/19
Inventor 周建军张维召耿波杨超江波赵涛王吉祥
Owner HANDAN IRON & STEEL GROUP
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