CN103014304B

CN103014304B - Plate shape control method for steel plate quenching

Info

Publication number: CN103014304B
Application number: CN201210558638.8A
Authority: CN
Inventors: 张健; 李新玲; 王若钢; 张紫茵; 李靖年; 刘浩岩; 王动; 刘立强; 丛津功
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2014-03-12
Anticipated expiration: 2032-12-21
Also published as: CN103014304A

Abstract

The invention provides a plate shape control method for steel plate quenching. For a steel plate with the nickel content of 8-10% and the thickness of 5-7 mm, the rolling convexity is controlled to be no more than 0.15 mm; 20 units of spray nozzles of a quenching machine are distributed in three segments: the first segment comprises slit spray nozzles ranging from unit 1 to unit 6, the high-pressure segment spray nozzles range from unit 7 to unit 12, and the low-pressure segment spray nozzles range from unit 13 to unit 20; and during quenching, the quenching speed is controlled to be 53-55 m/min, the rolling reduction of an upper roll system of a quenching unit is in a range from 0.48 mm to 0.52 mm, and the water volumes of all the units of the spray nozzles are controlled reasonably, so that the maximum unevenness of a steel plate is controlled to be in a range between 4 mm and 6 mm, buckling and wave-shaped defects of the steel plate after quenching are reduced greatly, and the qualified rate of the surface quality of the steel plate is improved.

Description

A kind of steel plate quenching board-shape control method

Technical field

The invention belongs to steel rolling process field, relate in particular to the control method of plate shape in a kind of nickel content 8-10%, thickness 5-7mm steel plate quenching process.

Background technology

Along with country constantly strengthens energy reserves demand, sheet material market is in great demand to the plate of moderate thickness steel plate of the 5-7mm of 9Ni at present.And being subject to the restriction of product working conditions, client is close to harsh to the requirement of product plate shape.The prefabricated rear roughness of 5-7mm steel plate is only 3-4mm/m.Yet in Plate Production Process, the quenched and tempered state that is 5-7mm at 8-10%, thickness for nickel content delivery steel plate, with respect to plate of moderate thickness, this thickness belongs to ultra-thin, High Strength Steel Plate, after rolling in quenching process, very easily there is wooden dipper song and shape wave in its plate shape, have a strong impact on the soleplate shape of steel plate, a large amount of steel plates cannot be delivered for use, and can only scrap processing, therefore affect up-to-standard rate, Ye Gei enterprise causes greatly financial loss simultaneously.

Summary of the invention

Object of the present invention aims to provide the method for the steel plate quenching plate shape that a kind of effective control nickel content is 5-7mm at 8-10%, thickness, thereby guarantees the roughness of steel plate, reduces wooden dipper song and shape wave defect, improves the surface quality of steel plate.

For this reason, the solution that the present invention takes is:

A steel plate quenching board-shape control method, is characterized in that, for the steel plate of nickel content 8-10%, thickness 5-7mm, the concrete grammar that its plate shape is controlled is:

(1), steel plate rolling Crown control is at≤0.15mm;

(2), 20 groups of nozzles of quenching press adopt syllogic to distribute: first paragraph is gap nozzle 1-6 group, high pressure section nozzle 7-12 group, low-pressure stage nozzle 13-20 group; In quenching process, each is organized the nozzle water yield and is controlled at:

1 group

2 groups

3 groups

4 groups

5 groups

6 groups

7 groups

145-155m ³/h

290-310 m ³/h

145-155m ³/h

190-200 m ³/h

385-395 m ³/h

190-200 m ³/h

97-99m ³/h

8 groups

9 groups

10 groups

11 groups

12 groups

13 groups

14 groups

195-200 m ³/h

96-100 m ³/h

125-129 m ³/h

250-258 m ³/h

125-129 m ³/h

275-280m ³/h

355-362 m ³/h

15 groups

16 groups

17 groups

18 groups

19 groups

20 groups

?

24-26%

34-36%

23-27%

33-36%

24-27%

33-37%

?

In table: the % of 15-20 group represents the aperture of this group cooling sea water regulating valve;

(3), quenching velocity is controlled at 53-55m/min;

(4), quenching unit upper roller system draught is 0.48-0.52mm.

Beneficial effect of the present invention is:

Adopt the present invention, the maximum roughness of steel plate can be controlled between 4-6mm, greatly reduce wooden dipper song and the shape wave defect of steel plate after quenching, improve the surface quality qualification rate of steel plate.

Embodiment

Take and produce steel grade as 9Ni, thickness are as 6mm ultra-thin steel sheet is example, the present invention is further illustrated.

Embodiment 1:

1, steel plate rolling Crown control is at 0.10mm.

2,20 groups of nozzles of quenching press adopt syllogic to distribute: first paragraph is gap nozzle 1-6 group, high pressure section nozzle 7-12 group, low-pressure stage nozzle 13-20 group; In quenching process, each is organized the nozzle water yield and is controlled at:

1 group

2 groups

3 groups

4 groups

5 groups

6 groups

7 groups

145m ³/h

310 m ³/h

155m ³/h

190 m ³/h

390 m ³/h

195 m ³/h

98m ³/h

8 groups

9 groups

10 groups

11 groups

12 groups

13 groups

14 groups

195 m ³/h

97m ³/h

126 m ³/h

258 m ³/h

125 m ³/h

278m ³/h

358 m ³/h

15 groups

16 groups

17 groups

18 groups

19 groups

20 groups

?

24%

36%

25%

35%

26%

34%

?

In table: the % of 15-20 group represents the aperture of this group cooling sea water regulating valve.

3, quenching velocity is controlled at 53m/min.

4, quenching unit upper roller system draught is 0.50mm.

Embodiment 2:

1, steel plate rolling Crown control is at 0.12mm.

1 group

2 groups

3 groups

4 groups

5 groups

6 groups

7 groups

155m ³/h

295 m ³/h

145m ³/h

200 m ³/h

386 m ³/h

200 m ³/h

99m ³/h

8 groups

9 groups

10 groups

11 groups

12 groups

13 groups

14 groups

200 m ³/h

99m ³/h

128 m ³/h

251 m ³/h

127m ³/h

275m ³/h

360m ³/h

15 groups

16 groups

17 groups

18 groups

19 groups

20 groups

?

25%

35%

27%

33%

26%

36%

?

3, quenching velocity is controlled at 54m/min.

4, quenching unit upper roller system draught is 0.52mm.

Embodiment is by rationally adjustment and control the gap nozzle 1-6 group water yield, can effectively control the horizontal inhomogeneous cooling of steel plate, reduces defects such as producing middle arch and depression; By adjusting the high and low pressure section nozzle water yield, can reduce generation Xia Kouhuo two, steel plate two and upwarp defect, avoid steel plate to produce the problem of longitudinal inhomogeneous cooling; By controlling quenching velocity, can reduce the defects such as steel plate edge shape wave, thereby improve the up-to-standard rate of steel plate.

Claims

1. a steel plate quenching board-shape control method, is characterized in that, for the steel plate of nickel content 8-10%, thickness 5-7mm, the concrete grammar that its plate shape is controlled is:

(1), steel plate rolling Crown control is at≤0.15mm;

1 group: 145-155m ³/ h, 2 groups: 290-310m ³/ h, 3 groups: 145-155m ³/ h, 4 groups: 190-200m ³/ h, 5 groups: 385-395m ³/ h, 6 groups: 190-200m ³/ h, 7 groups: 97-99m ³/ h, 8 groups: 195-200m ³/ h, 9 groups: 96-100m ³/ h, 10 groups: 125-129m ³/ h, 11 groups: 250-258m ³/ h, 12 groups: 125-129m ³/ h, 13 groups: 275-280m ³/ h, 14 groups: 355-362m ³/ h;

Each is organized chilled water modulation valve opening and is controlled at:

15 groups: 24-26%, 16 groups: 34-36%, 17 groups: 23-27%, 18 groups: 33-36%, 19 groups: 24-27%, 20 groups: 33-37%;

(3), quenching velocity is controlled at 53-55m/min;

(4), quenching unit upper roller system draught is 0.48-0.52mm.