CN109365527B - Rolling method of wide and thick steel plate with large spreading ratio - Google Patents
Rolling method of wide and thick steel plate with large spreading ratio Download PDFInfo
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- CN109365527B CN109365527B CN201811450141.8A CN201811450141A CN109365527B CN 109365527 B CN109365527 B CN 109365527B CN 201811450141 A CN201811450141 A CN 201811450141A CN 109365527 B CN109365527 B CN 109365527B
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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
Abstract
A rolling method of a wide and thick steel plate with a large broadening ratio is disclosed, the broadening ratio is more than or equal to 1.75, the method comprises the following steps: after heating and descaling of the right-angle continuous casting billet, vertical pre-forming rolling is carried out by adopting a vertical-flat roller, so that a foot roller indentation line on the narrow surface of the continuous casting billet is turned to the upper surface and the lower surface through widening, then steel is turned to carry out transverse widening rolling, and after widening, steel is turned again to carry out longitudinal forming rolling. Compared with the traditional wide and thick plate rolling mode, the rolling method changes the stress state and the flowing condition of the foot roll indentation line on the narrow surface, effectively prevents or reduces the edge straight crack defect caused by the indentation line, and improves the yield of the wide-specification steel plate.
Description
Technical Field
The invention belongs to the technical field of metallurgical rolling, and particularly relates to a rolling method of a wide and thick steel plate with a large broadening ratio.
Background
When the wide and thick plate continuous casting billet is widened and rolled, because side metal flows to the surface when biting or throwing steel, the defect of approximate linear type is often generated on the upper surface and the lower surface of the steel plate close to the edge, and the defect is like edge straight crack and commonly exists in the existing wide and thick plate steel enterprises. Generally, the larger the widening ratio is, the larger the distance between the straight edge crack and the edge part is, and the deeper the crack depth is, so that the direct loss is caused by the fact that the trimming amount of a steel plate is increased, the yield is reduced, and the production cost is increased; further, the edge straight crack defect of the lower surface of the steel plate cannot be completely cut, and quality risks are brought.
At present, in order to eliminate or reduce the edge straight crack defect of the wide and thick plate, some patent technologies for improving the edge of the continuous casting billet are gradually invented. For example, Chinese patent CN 200998764Y, CN 201380275Y proposes a slab fillet crystallizer; chinese patent CN 2547438Y, CN 102274934B proposes a slab chamfering crystallizer. Although the novel slab crystallizers achieve certain effect on controlling the edge straight crack defect of the wide and thick plate, the narrow-face copper plate of the crystallizer is easy to wear and deform, the service life of the narrow-face copper plate cannot meet the requirement of industrial production, and the arc curved surface and the chamfer surface are small in size, so that the defects of cracks, subcutaneous bubbles, impurities and the like are easy to generate on the surface of the narrow-face copper plate. The Chinese patent CN 106734370A adopts an artificial flame chamfering method to prevent the edge of a wide-specification steel plate from generating edge straight cracks, but when the chamfering angle is small (only the edge of a right-angle casting blank is cleaned by flame), the edge straight crack defect is not eliminated (Hancheng, Heyuanchun, Uracaceae, and the like; research and control of the longitudinal edge crack of a medium and heavy plate; proceedings of the national steel rolling production technical association of 2012: 581 to 585. in 2012) and when the chamfering angle is large (15 to 20 degrees), the defects of sharp points, bulges, steps, ignition pits, scabs, and the like are easy to generate to cause the local folding or heavy skin defect after the steel plate is rolled.
Disclosure of Invention
In view of the above problems of the prior art, an object of the present invention is to provide a rolling method for preventing the occurrence of straight edge crack defects in a wide and thick steel sheet having a large spreading ratio, so as to improve the yield of the steel sheet.
The technical scheme of the invention is as follows:
a rolling method of a wide and thick steel plate with a large broadening ratio is disclosed, the broadening ratio is more than or equal to 1.75, the method comprises the following steps: after heating and descaling the right-angle continuous casting billet, performing longitudinal preforming rolling by adopting a vertical-flat roller, turning the upper foot roller indentation line on the narrow surface of the continuous casting billet to the upper surface and the lower surface through widening, and then turning steel to perform transverse widening rolling; and after widening, turning the steel again to perform longitudinal forming rolling. Wherein, the longitudinal direction refers to that the narrow surface of the continuous casting billet is parallel to the rolling direction; the transverse direction means that the narrow surface of the continuous casting billet is vertical to the rolling direction.
Further, heating and descaling the right-angle continuous casting billet, preferably, the heating temperature is more than or equal to 1200 ℃; the descaling water pressure is more than or equal to 210 bar.
Further, the preforming rolling is to turn the foot roll indentation line on the narrow surface of the continuous casting billet to the upper surface and the lower surface through widening, and preferably, the distance between the foot roll indentation line on the narrow surface of the right-angle continuous casting billet and the surface is controlledL ALess than or equal to 20mm, and the accumulated width of the corresponding edge of the indentation lineL B≥L A. More preferably, in order to makeL B≥L AControlling the thickness of the continuous casting blank to be more than or equal to 250mm, the cumulative reduction of the preforming horizontal roller to be more than or equal to 60mm, the cumulative side pressure of the vertical roller to be more than or equal to 80mm, and the rolling speed to be less than or equal to 3.0 m/s; the diameter of the horizontal roller working roll is 1110-1210 mm, and the diameter of the vertical roller working roll is 900-1000 mm.
Preferably, the pass reduction rate of the widening rolling is less than or equal to 15 percent, and the rolling speed is less than or equal to 3.0 m/s.
The forming rolling preferably comprises rough rolling and finish rolling, wherein the finish rolling uses a bending roller and a shifting roller.
The invention has the beneficial effects that: compared with the traditional wide and thick plate rolling mode, the vertical-flat roller pre-forming rolling method adopts more passes of vertical-flat roller pre-forming rolling to turn the foot roller indentation lines on the narrow surface of the continuous casting billet to the upper surface and the lower surface through widening, and the plurality of indentation lines are mainly turned to the upper surface and the lower surface through biting or steel throwing in the widening and rolling stage in the traditional way. Calculated by a steel plate with the width of 4000mm, the shear amount of one side can be reduced by 20-40 mm, and the yield can be improved by 1% -2%, so that the economic benefit of the invention is obvious.
Drawings
FIG. 1 is a schematic diagram of a foot roll crease line on a narrow surface of a continuous casting billet flowing to the surface through a wide spread in vertical-flat roll preforming rolling.
In the drawing, ① is the section of the continuous casting billet before vertical-horizontal rolling, ② is the section of the continuous casting billet after vertical rolling, ③ is the section of the continuous casting billet after horizontal rolling, and W is0And H is the width and thickness of the continuous casting billet before rolling respectively; wEThe width of a rolled piece after vertical roll rolling, h the thickness of the rolled piece after flat roll rolling, △ W the width of the rolled piece, a certain point on a foot roll crease line on a narrow surface, and a' are the position change conditions of the point in the vertical-flat roll rolling process.
Fig. 2 is a typical topography photograph of a foot roll scoreline on the narrow side of a right angle continuous casting billet, as shown by an arrow.
Detailed Description
The following examples are provided to further illustrate the present invention.
The invention relates to a rolling method of a wide and thick steel plate with a large broadening ratio, which comprises the following steps: after heating and descaling of the right-angle continuous casting billet, vertical pre-forming rolling is carried out by adopting a vertical-flat roller, so that a foot roller indentation line on the narrow surface of the continuous casting billet is turned to the upper surface and the lower surface through widening, then steel is turned to carry out transverse widening rolling, and after widening, steel is turned again to carry out longitudinal forming rolling. Wherein, the longitudinal direction refers to that the narrow surface of the continuous casting billet is parallel to the rolling direction; the transverse direction means that the narrow surface of the continuous casting billet is vertical to the rolling direction.
The schematic diagram of the foot roll crease line on the narrow surface of the continuous casting billet flowing to the surface through the wide span in the vertical-flat roll preforming rolling is shown in figure 1; a typical topography photograph of the foot roll score line on the narrow side of the slab is shown in FIG. 2.
The specific embodiment is carried out on a 5-meter wide and thick plate rolling line, and the main production equipment comprises a walking beam type heating furnace; the system pressure of the high-pressure water descaling box is 230bar, and the pressure drop in the descaling process is controlled to be less than or equal to 5 bar; the four-roll reversible roughing mill with the vertical rolls has the working rolls of 900-1000 mm in diameter and the horizontal rolls of 1110-1210 mm in diameter; a four high reversing finishing mill with bending rolls and shifting rolls; and an accelerated cooling system.
Example 1
The thickness of the right-angle continuous casting billet is 260mm, the width is 1870mm, the width of the steel plate is 3400mm, the cut variable is about 30 mm/side, and the aspect ratio is 1.85; the distance between a foot roll pressing crease line on the narrow surface of the continuous casting billet and the surface is 14-16 mm; the heating temperature of the continuous casting billet is 1235 ℃; the preforming rolling comprises 3 passes of vertical roll rolling and 3 passes of horizontal roll rolling, the accumulated lateral pressure of the vertical roll is 90mm, the lateral pressure of each pass is 30mm, the accumulated rolling reduction of the horizontal roll is 67.4mm, and the accumulated width and width of each pass of the preforming rolling are about 16.9 mm/side on average; the maximum preforming rolling speed is 1.86 m/s; the maximum pass reduction rate of widening rolling is 11.5%, and the maximum rolling speed is 2.08 m/s.
Example 2
The thickness of the right-angle continuous casting billet is 260mm, the width is 2070mm, the width of the steel plate is 4150mm, the cutting variable is about 25 mm/edge, and the aspect ratio is 2.03; the distance between the foot roll pressing crease line on the narrow surface of the continuous casting billet and the surface is 13-15 mm; the heating temperature of the continuous casting billet is 1220 ℃; the preforming rolling comprises 4 passes of vertical roller rolling and 4 passes of horizontal roller rolling, the accumulated lateral pressure of the vertical roller is 100mm, the lateral pressure of each pass is 25mm, the accumulated rolling reduction of the horizontal roller is 86.8mm, and the accumulated width and width of each pass of the preforming rolling are about 20.7 mm/side on average; the maximum preforming rolling speed is 2.16 m/s; the maximum pass reduction rate of widening rolling is 14.6%, and the maximum rolling speed is 1.82 m/s.
Example 3
The thickness of the right-angle continuous casting billet is 300mm, the width is 2070mm, the width of the steel plate is 4800mm, the shear volume is about 40 mm/edge, and the aspect ratio is 2.36; the distance between a foot roller pressing crease line on the narrow surface of the continuous casting billet and the surface is 18-19 mm; the heating temperature of the continuous casting billet is 1210 ℃; the preforming rolling comprises 5 passes of vertical roll rolling and 3 passes of horizontal roll rolling, the accumulated lateral pressure of the vertical roll is 100mm, the lateral pressure of each pass is 20mm, the accumulated rolling reduction of the horizontal roll is 70.9mm, and the accumulated width and width of each pass of the preforming rolling are about 19.3 mm/side on average; the maximum preforming rolling speed is 2.37 m/s; the maximum pass reduction rate of widening rolling is 13.9%, and the maximum rolling speed is 2.24 m/s.
Example 4
The thickness of the right-angle continuous casting billet is 300mm, the width of the right-angle continuous casting billet is 2270mm, the width of the steel plate is 4350mm, the shear volume is about 35 mm/edge, and the aspect ratio is 1.95; the distance between the foot roll pressing crease line on the narrow surface of the continuous casting billet and the surface is 17-19 mm; the heating temperature of the continuous casting billet is 1210 ℃; the preforming rolling comprises 8-pass vertical roll rolling and 4-pass horizontal roll rolling, the accumulated lateral pressure of the vertical rolls is 120mm, the lateral pressure of each pass is 15mm, the accumulated rolling reduction of the horizontal rolls is 97.2mm, and the accumulated width and width of each pass of the preforming rolling are about 24.6 mm/side on average; the maximum preforming rolling speed is 2.85 m/s; the maximum pass reduction rate of widening rolling is 13.8%, and the maximum rolling speed is 1.47 m/s.
Example 5
The thickness of the right-angle continuous casting billet is 300mm, the width is 1870mm, the width of the steel plate is 3280mm, the cut variable is about 25 mm/edge, and the aspect ratio is 1.78; the distance between a foot roller pressing crease line on the narrow surface of the continuous casting billet and the surface is 18-19 mm; the heating temperature of the continuous casting billet is 1220 ℃; the preforming rolling comprises 3 passes of vertical roll rolling and 5 passes of horizontal roll rolling, the accumulated lateral pressure of the vertical roll is 80mm, the lateral pressure of each pass is 20mm, 30mm and 30mm respectively, the accumulated rolling reduction of the horizontal roll is 104.5mm, and the average accumulated width and width of each pass of the preforming rolling is about 20.1 mm/side; the maximum preforming rolling speed is 2.48 m/s; the maximum pass reduction rate of widening rolling is 11.5%, and the maximum rolling speed is 2.06 m/s.
The edge straight crack defect of the wide and thick steel plate with the large spreading ratio produced by the method is effectively controlled, and the surface quality qualification rate of the edge part of the wide and thick steel plate with the large spreading ratio can be improved through a small cutting amount.
Claims (6)
1. A rolling method of a wide and thick steel plate with a large spreading ratio is characterized by comprising the following steps: after heating and descaling the right-angle continuous casting billet, performing longitudinal preforming rolling by adopting a vertical-flat roller, turning the upper foot roller indentation line on the narrow surface of the continuous casting billet to the upper surface and the lower surface through widening, and then turning steel to perform transverse widening rolling; and after widening, turning the steel again to perform longitudinal forming rolling.
2. The method for rolling a wide and thick steel plate with a large spreading ratio according to claim 1, wherein: the heating temperature of the continuous casting billet is more than or equal to 1200 ℃; the descaling water pressure is more than or equal to 210 bar.
3. The method for rolling a wide and thick steel plate with a large spreading ratio according to claim 1, wherein: the preforming rolling controls the distance between the foot roller indentation line and the surface on the narrow surface of the right-angle continuous casting billetL ALess than or equal to 20mm, and the accumulated width of the corresponding edge of the indentation lineL B≥L A。
4. The method for rolling a wide and thick steel plate with a large spreading ratio according to claim 3, wherein: to make it possible toL B≥L AControlling the thickness of the continuous casting blank to be more than or equal to 250mm, the cumulative reduction of the preforming horizontal roller to be more than or equal to 60mm, the cumulative side pressure of the vertical roller to be more than or equal to 80mm, and the rolling speed to be less than or equal to 3.0 m/s; the diameter of the horizontal roller working roll is 1110-1210 mm, and the diameter of the vertical roller working roll is 900-1000 mm.
5. The method for rolling a wide and thick steel plate with a large spreading ratio according to claim 1, wherein: the pass reduction rate of the widening rolling is less than or equal to 15 percent, and the rolling speed is less than or equal to 3.0 m/s.
6. The method for rolling a wide and thick steel plate with a large spreading ratio according to claim 1, wherein: the forming rolling comprises rough rolling and finish rolling, wherein the finish rolling uses a bending roller and a shifting roller.
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| CN112893467B (en) * | 2021-01-14 | 2022-08-16 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
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| CN103831412B (en) * | 2014-02-26 | 2017-01-18 | 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 |
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