CN109365527A - A kind of milling method of big broadening ratio Wide and Heavy Plates - Google Patents
A kind of milling method of big broadening ratio Wide and Heavy Plates Download PDFInfo
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- CN109365527A CN109365527A CN201811450141.8A CN201811450141A CN109365527A CN 109365527 A CN109365527 A CN 109365527A CN 201811450141 A CN201811450141 A CN 201811450141A CN 109365527 A CN109365527 A CN 109365527A
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- rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
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Abstract
A kind of milling method of big broadening ratio Wide and Heavy Plates, broadening ratio >=1.75, this method comprises the following steps: after the heating of right angle continuous casting billet, de-scaling, longitudinal preforming rolling is carried out using vertical-plain-barreled roll, overturn sufficient roll-in trace line on continuous casting billet leptoprosopy to upper and lower surfaces by spreading, then turn steel and carry out lateral broadening rolling, after broadening, turn steel again and carry out longitudinal formation rolling.Compared with traditional Plate rolling mode, milling method of the invention changes the stress and its mobility status of sufficient roll-in trace line on leptoprosopy, is effectively prevented or alleviates side caused by this indentation line and directly split defect, improves the lumber recovery of wide specification steel plate.
Description
Technical field
The invention belongs to metallurgy rolling technical fields, more particularly to a kind of milling method of big broadening ratio Wide and Heavy Plates.
Background technique
When the broadening rolling of wide thickness plate continuous casting base, side metal is to surface flow when due to biting or throwing steel, usually in steel plate
Occurs the defect of near linear type by the upper and lower surface of edge, this defect is called side and directly splits, and looks forward in existing Wide and Thick Slab steel
It is generally existing in industry.In general, broadening ratio is bigger, the straight split separation edge distance in side is bigger, and crack depth is deeper, caused direct losses
It is the trimming amount increase of steel plate, lumber recovery reduces, and the production cost increases；It directly splits on the side that further may cause lower surface of steel plate
Defect fails to cut completely only, brings quality risk.
Currently, directly split defect to eliminate or mitigate the side of Wide and Thick Slab, it is some improved for continuous casting billet seamed edge it is special
Sharp technology is gradually invented.As Chinese patent CN 200998764 Y, CN 201380275 Y propose slab fillet crystallizer；
Chinese patent CN 2547438 Y, CN 102274934 B propose plate blank chamfering crystallizer.Although these novel slab crystallizations
Device is directly split on the side of Wide and Thick Slab achieves certain effect on powder injection molding, but since the narrow copper plate of this kind of crystallizer is easy hair
Raw abrasion, deformation, service life are also unable to satisfy industrialization production requirements, and due to the size of circular arc camber, fillet surface
It is smaller, it is easy to crack on its face, rimhole, the defects of being mingled with.106734370 A of Chinese patent CN is using artificial
The method of flame chamfering prevents from wide specification steel plate edge from generating side directly splitting, but (only to perpendicular type slab when chamfer angle is smaller
Edge carries out scafing), side directly splits defect and is not eliminated (Han Chengliang, He Yuanchun, the cut deal longitudinal edge such as Ursidae
The research split and control national Rolling production technology in 2012 can collection of thesis, 2012: 581 ~ 585.), chamfer angle compared with
When big (15 ~ 20 °), the defects of being easy to produce sharp, raised, step, point fiery pit, scabbing and there is part after causing steel plate rolling
Folding or skin lamination defect.
Summary of the invention
In view of the above problems in the prior art, the purpose of the present invention is to provide one kind to prevent big broadening ratio Wide and Heavy Plates from producing
The milling method of defect is directly split on raw side, to improve yield of steel plate.
Technical solution of the present invention:
A kind of milling method of big broadening ratio Wide and Heavy Plates, broadening ratio >=1.75, this method comprises the following steps: right angle continuous casting billet
After de-scaling, longitudinal preforming rolling is carried out using vertical-plain-barreled roll for heating, makes on continuous casting billet leptoprosopy sufficient roll-in trace line by spreading
On overturning to upper and lower surfaces, then turns steel and carry out lateral broadening rolling；After broadening, turn again steel carry out it is longitudinal at
Type rolling.Wherein, the longitudinal direction refer to continuous casting billet leptoprosopy with roll to parallel；The transverse direction refers to continuous casting billet leptoprosopy and rolls to vertical
Directly.
Further, right angle continuous casting billet heating, de-scaling, it is preferable that heating temperature >=1200 DEG C；De-scaling water pressure
≥210bar。
Further, the preforming rolling, for make on continuous casting billet leptoprosopy sufficient roll-in trace line by spread overturning it is supreme,
On lower surface, it is preferable that sufficient roll-in trace line is away from surface distance on control right angle continuous casting billet leptoprosopyL A≤ 20mm, and indentation line is corresponding
The accumulative of seamed edge is spreadedL B≥L A.It is highly preferred that makeL B≥L A, thickness of strand >=250mm is controlled, preforming horizontal roller is tired
Drafts >=60mm is counted, edger roll adds up lateral pressure amount >=80mm, mill speed≤3.0m/s；Horizontal roller work roll diameter be 1110 ~
1210mm, edger roll work roll diameter are 900 ~ 1000mm.
The broadening rolling, it is preferable that percentage pass reduction≤15%, mill speed≤3.0m/s.
The formation rolling, it is preferable that including roughing and finish rolling, wherein finish rolling uses roller and roll shifting.
Beneficial effects of the present invention: compared with traditional Plate rolling mode, the present invention uses vertical-plain-barreled roll compared with multi-pass
Preforming rolling overturns roll-in trace line sufficient on continuous casting billet leptoprosopy to upper and lower surfaces by spreading, and traditionally this several pressures
Trace line is mainly overturn by biting or throwing steel process to upper and lower surfaces in broadening rolling sequence, it is clear that milling method of the invention
The stress and its mobility status for changing sufficient roll-in trace line on leptoprosopy, are effectively prevented or alleviate this indentation line and cause
Side directly split defect, improve the lumber recovery of wide specification steel plate.With the calculating of 4000mm width steel plate, unilateral shear amount can subtract
Few 20 ~ 40mm, then lumber recovery can be improved 1% ~ 2%, thus economic benefit of the invention is obvious.
Detailed description of the invention
When Fig. 1 is the preforming rolling of vertical-plain-barreled roll on continuous casting billet leptoprosopy sufficient roll-in trace line by spreading showing to surface flow
It is intended to.
It is 1. the Cross Section of CC Billet before V-H rolling in figure；2. for the Cross Section of CC Billet after edge rolling；3. being flat
Cross Section of CC Billet after rolling system；W0It is respectively continuous casting billet width and thickness before rolling with H；WEFor rolled piece width after edge rolling；h
For rolled piece thickness after flat rolling；△ W spreads for rolled piece；A is the certain point on leptoprosopy in sufficient roll-in trace line；A ' and a ' ' is should
Change in location situation of the point in V-H rolling process.
Fig. 2 is the typical pattern photo of sufficient roll-in trace line on right angle continuous casting billet leptoprosopy, as shown by arrows.
Specific embodiment
The contents of the present invention are further illustrated with embodiment combination attached drawing below.
A kind of milling method of big broadening ratio Wide and Heavy Plates of the invention includes the following steps: the heating of right angle continuous casting billet, removes
After squama, using-longitudinal preforming the rolling of plain-barreled roll progress is stood, overturn sufficient roll-in trace line on continuous casting billet leptoprosopy extremely by spreading
On upper and lower surfaces, then turns steel and carry out lateral broadening rolling, after broadening, turn steel again and carry out longitudinal formation rolling.
Wherein, the longitudinal direction refer to continuous casting billet leptoprosopy with roll to parallel；The transverse direction refer to continuous casting billet leptoprosopy with roll to vertical.
When the preforming rolling of vertical-plain-barreled roll on continuous casting billet leptoprosopy sufficient roll-in trace line pass through spread to surface flow schematic diagram such as
Shown in Fig. 1；The typical pattern photo of sufficient roll-in trace line is as shown in Figure 2 on continuous casting billet leptoprosopy.
Specific embodiment carries out on 5 meters of Plate rolling lines, and main production equipments include walking beam heating furnace；High pressure
Water De-scaling box, system pressure 230bar control de-scaling process pressure drop≤5bar；Four-roller reversing rougher with edger roll,
Edger roll work roll diameter is 900 ~ 1000mm, and horizontal roller work roll diameter is 1110 ~ 1210mm；It can with roller and the four-roller of roll shifting
Inverse formula finishing mill；And acceleration cooling system.
Embodiment 1
Right angle thickness of strand is 260mm, width 1870mm, steel plate width 3400mm, the side shear amount about 30mm/, broadening
Than being 1.85；Sufficient roll-in trace line is 14 ~ 16mm away from surface distance on continuous casting billet leptoprosopy；Continuous blank heating temperature is 1235 DEG C；In advance
Formation rolling includes that 3 passage edge rollings and 3 passage horizontal rollers roll, and it is 90mm, each passage lateral pressure amount that edger roll, which adds up lateral pressure amount,
For 30mm, it is 67.4mm that horizontal roller, which adds up drafts, and accumulative spread of preforming each passage of rolling is averagely about the side 16.9mm/；In advance
Forming maximum mill speed is 1.86m/s；It is 11.5% that broadening, which rolls maximum percentage pass reduction, and maximum mill speed is 2.08m/
s。
Embodiment 2
Right angle thickness of strand is 260mm, width 2070mm, steel plate width 4150mm, the side shear amount about 25mm/, broadening
Than being 2.03；Sufficient roll-in trace line is 13 ~ 15mm away from surface distance on continuous casting billet leptoprosopy；Continuous blank heating temperature is 1220 DEG C；In advance
Formation rolling includes that 4 passage edge rollings and 4 passage horizontal rollers roll, and it is 100mm, each passage lateral pressure amount that edger roll, which adds up lateral pressure amount,
For 25mm, it is 86.8mm that horizontal roller, which adds up drafts, and accumulative spread of preforming each passage of rolling is averagely about the side 20.7mm/；In advance
Forming maximum mill speed is 2.16m/s；It is 14.6% that broadening, which rolls maximum percentage pass reduction, and maximum mill speed is 1.82m/
s。
Embodiment 3
Right angle thickness of strand is 300mm, width 2070mm, steel plate width 4800mm, the side shear amount about 40mm/, broadening
Than being 2.36；Sufficient roll-in trace line is 18 ~ 19mm away from surface distance on continuous casting billet leptoprosopy；Continuous blank heating temperature is 1210 DEG C；In advance
Formation rolling includes that 5 passage edge rollings and 3 passage horizontal rollers roll, and it is 100mm, each passage lateral pressure amount that edger roll, which adds up lateral pressure amount,
For 20mm, it is 70.9mm that horizontal roller, which adds up drafts, and accumulative spread of preforming each passage of rolling is averagely about the side 19.3mm/；In advance
Forming maximum mill speed is 2.37m/s；It is 13.9% that broadening, which rolls maximum percentage pass reduction, and maximum mill speed is 2.24m/
s。
Embodiment 4
Right angle thickness of strand is 300mm, width 2270mm, steel plate width 4350mm, the side shear amount about 35mm/, broadening
Than being 1.95；Sufficient roll-in trace line is 17 ~ 19mm away from surface distance on continuous casting billet leptoprosopy；Continuous blank heating temperature is 1210 DEG C；In advance
Formation rolling includes that 8 passage edge rollings and 4 passage horizontal rollers roll, and it is 120mm, each passage lateral pressure amount that edger roll, which adds up lateral pressure amount,
For 15mm, it is 97.2mm that horizontal roller, which adds up drafts, and accumulative spread of preforming each passage of rolling is averagely about the side 24.6mm/；In advance
Forming maximum mill speed is 2.85m/s；It is 13.8% that broadening, which rolls maximum percentage pass reduction, and maximum mill speed is 1.47m/
s。
Embodiment 5
Right angle thickness of strand is 300mm, width 1870mm, steel plate width 3280mm, the side shear amount about 25mm/, broadening
Than being 1.78；Sufficient roll-in trace line is 18 ~ 19mm away from surface distance on continuous casting billet leptoprosopy；Continuous blank heating temperature is 1220 DEG C；In advance
Formation rolling includes that 3 passage edge rollings and 5 passage horizontal rollers roll, and it is 80mm, each passage lateral pressure amount that edger roll, which adds up lateral pressure amount,
Respectively 20mm, 30mm, 30mm, it is 104.5mm that horizontal roller, which adds up drafts, and preforming each passage of rolling is accumulative to spread averagely about
For the side 20.1mm/；Preforming maximum mill speed is 2.48m/s；It is 11.5% that broadening, which rolls maximum percentage pass reduction, and maximum is rolled
Speed processed is 2.06m/s.
According to the big broadening ratio Wide and Heavy Plates that above-mentioned the method for the present invention produces, side directly splits defect and is effectively controlled, and leads to
Lesser shear amount is crossed, the surface quality qualification rate of big broadening ratio Wide and Heavy Plates edge can be improved.
Claims (6)
1. a kind of milling method of big broadening ratio Wide and Heavy Plates, broadening ratio >=1.75, it is characterised in that include the following steps: right angle
After continuous casting billet heating, de-scaling, longitudinal preforming rolling is carried out using vertical-plain-barreled roll, keeps sufficient roll-in trace line on continuous casting billet leptoprosopy logical
It crosses and spreads overturning to upper and lower surfaces, then turn steel and carry out lateral broadening rolling；After broadening, turns steel again and indulged
To formation rolling.
2. a kind of milling method of big broadening ratio Wide and Heavy Plates according to claim 1, it is characterised in that: continuous casting billet heating
Temperature >=1200 DEG C；De-scaling water pressure >=210bar.
3. a kind of milling method of big broadening ratio Wide and Heavy Plates according to claim 1, it is characterised in that: it is described it is pre- at
Type rolls, and sufficient roll-in trace line is away from surface distance on control right angle continuous casting billet leptoprosopyL A≤ 20mm, and indentation line corresponds to the tired of seamed edge
Meter spreadsL B≥L A。
4. preforming rolling according to claim 3, it is characterised in that: to makeL B≥L A, control thickness of strand >=
250mm, preforming horizontal roller add up drafts >=60mm, and edger roll adds up lateral pressure amount >=80mm, mill speed≤3.0m/s；It is horizontal
Roller work roll diameter is 1110 ~ 1210mm, and edger roll work roll diameter is 900 ~ 1000mm.
5. a kind of milling method of big broadening ratio Wide and Heavy Plates according to claim 1, it is characterised in that: the broadening
Rolling, percentage pass reduction≤15%, mill speed≤3.0m/s.
6. a kind of milling method of big broadening ratio Wide and Heavy Plates according to claim 1, it is characterised in that: the molding
Rolling, including roughing and finish rolling, wherein finish rolling uses roller and roll shifting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811450141.8A CN109365527B (en) | 2018-11-30 | 2018-11-30 | Rolling method of wide and thick steel plate with large spreading ratio |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811450141.8A CN109365527B (en) | 2018-11-30 | 2018-11-30 | Rolling method of wide and thick steel plate with large spreading ratio |
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| CN109365527A true CN109365527A (en) | 2019-02-22 |
| CN109365527B CN109365527B (en) | 2020-02-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112474801A (en) * | 2020-11-09 | 2021-03-12 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112893467A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN114393034A (en) * | 2022-01-04 | 2022-04-26 | 湖南湘投金天科技集团有限责任公司 | Preparation method of titanium alloy with large broadening ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09164402A (en) * | 1995-12-14 | 1997-06-24 | Daido Steel Co Ltd | Rolling method |
| CN103752622A (en) * | 2013-12-23 | 2014-04-30 | 宝山钢铁股份有限公司 | Heavy plate rolling control method for removing defect on edge of continuous casting bloom |
| CN103831412A (en) * | 2014-02-26 | 2014-06-04 | 钢铁研究总院 | Production method for controlling straight crack defect of surface edge of medium-thick plate |
| CN106862269A (en) * | 2017-03-24 | 2017-06-20 | 重庆大学 | It is a kind of to suppress the method that magnesium alloy plate edge splits |
| CN107096795A (en) * | 2017-05-23 | 2017-08-29 | 宁波钢铁有限公司 | A kind of manufacture method for reducing edge defects of hot rolled strip steel |
-
2018
- 2018-11-30 CN CN201811450141.8A patent/CN109365527B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09164402A (en) * | 1995-12-14 | 1997-06-24 | Daido Steel Co Ltd | Rolling method |
| CN103752622A (en) * | 2013-12-23 | 2014-04-30 | 宝山钢铁股份有限公司 | Heavy plate rolling control method for removing defect on edge of continuous casting bloom |
| CN103831412A (en) * | 2014-02-26 | 2014-06-04 | 钢铁研究总院 | Production method for controlling straight crack defect of surface edge of medium-thick plate |
| CN106862269A (en) * | 2017-03-24 | 2017-06-20 | 重庆大学 | It is a kind of to suppress the method that magnesium alloy plate edge splits |
| CN107096795A (en) * | 2017-05-23 | 2017-08-29 | 宁波钢铁有限公司 | A kind of manufacture method for reducing edge defects of hot rolled strip steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112474801A (en) * | 2020-11-09 | 2021-03-12 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112474801B (en) * | 2020-11-09 | 2022-05-17 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112893467A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN114393034A (en) * | 2022-01-04 | 2022-04-26 | 湖南湘投金天科技集团有限责任公司 | Preparation method of titanium alloy with large broadening ratio |
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| CN109365527B (en) | 2020-02-07 |
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