Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
  • B23K7/06—Machines, apparatus or equipment specially designed for scarfing or desurfacing
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
• • 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
  • B21B45/004—Heating the product
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/45—Scale remover or preventor
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/45—Scale remover or preventor
  • Y10T29/4517—Rolling deformation or deflection
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/45—Scale remover or preventor
  • Y10T29/4533—Fluid impingement
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/45—Scale remover or preventor
  • Y10T29/4533—Fluid impingement
  • Y10T29/4539—Fluid impingement with heater
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/45—Scale remover or preventor
  • Y10T29/4533—Fluid impingement
  • Y10T29/4544—Liquid jet

Definitions

• the invention relates to a method and a device for improving the surface quality by an inline surface treatment of slabs, which are produced in a continuous process from continuous casting to hot rolling, for example according to the CSP method with a heating furnace arranged between the casting machine and the hot rolling line.
• Thin and thick slabs up to 400 mm thick, produced on continuous casters, may have small discontinuities and residual powder particles near and on the surface and chemical composition changes near the surface.
• a method and a device for improving the surface of the cast strand of a preferred slab caster by inline ablation of the cast strand surface are known from EP 1 093 866 A2.
• the removal is carried out after passing through a heating furnace shortly before the inline rolling of the cast strand.
• use is made of arcs, laser beams or mechanical means, but preferably hot blasting with an inline flaming machine with or without mechanical reworking of the cast strand surface.
• the object of the present invention is to provide a machine for in-line surface treatment of slabs produced in a continuous process, for example by the CSP process, with hot strips of high quality Application and an excellent surface quality can be produced and in which the above-described remaining "cosmetic" Obe phytoerschei-tions are completely prevented.
• the stated object is achieved by the characterizing features of claim 1, characterized in that by an oxidizing device containing by means of a nozzle or nozzle-like devices on the top and bottom of the slab oxidizing flame or oxidizing gas mixture selectively a defined surface layer of the slab with a layer thickness per slab side up to 4 mm is oxidized;
• the oxidation product on the slab surface can be solid or liquid.
• Variation of the volume flows of the gases used for the oxidation Variation of the oxidation potential and / or the volume flows of the gases used for the oxidation depending on the process parameters such as slab transport speed and steel grade,
• the inventive in-line oxidation treatment of the slab surface with an oxidizing flame or with an oxidizing gas mixture, which is also applicable to extremely thin, referred to as thin slabs slabs is associated with the following upstream and downstream processing inline process steps: Before the oxidation treatment, the slab surface is freed from naturally occurring scale. This is done by a scale washer, which can be driven in the low pressure or high pressure range.
• the brittleness of the layers formed are cooled down by wetting nozzles by means of, for example, water. By a subsequent pair of rollers, these layers are then mechanically broken and then removed by a scale washer.
• the in-line surface treatment of the slab may be carried out after leaving the casting machine and before entering the heating furnace or alternatively after exiting the heating furnace and before entering the hot rolling mill. If the surface treatment is carried out in front of the heating furnace, a low-pressure scale scrubber (slab rinser with pressures of 100 bar) or a rotor trimmer can be used to remove the layers formed.
• the conventional high-pressure scale scrubber existing in front of the hot-rolling mill and operating at high pressures can be used in connection to the surface treatment apparatus.
• the roller pair used for mechanically breaking the layers formed also serves as a pair of driver rollers for the existing high-pressure scale scrubber.
• all equipment and devices required for the surface treatment are advantageously designed individually or jointly in and out of the production line so that, depending on process parameters such as, for example, steel grade, casting speed, no-steady-state process the surface treatment can not be restricted to the entire production, but can alternatively be limited to production quantities.
• these apparatuses and devices are designed and arranged within the production line such that the surface treatment can optionally be carried out over the entire width of the slab or specifically limited to local or isolated sections of slab width or length.
• FIG. 2 shows a detail from FIG. 1 with a surface treatment device
• FIG. 3 shows a detail from FIG. 1 with an alternative arrangement of the surface treatment device
• FIG. 4 shows a CSP production line with surface treatment arranged behind the heating furnace
• Figure 5 shows a detail of FIG. 4 with a surface treatment device.
• FIG. 1 shows in a perspective view the plant flow diagram of a CSP production line 1 with its main plant parts, a CSP casting machine 2, a heating furnace 3 and a hot rolling mill 4 in which 1 1 (in the drawing figure from left to right) a slab 5 is poured, warmed up and then hot rolled.
• 1 1 in the drawing figure from left to right
• a slab 5 is poured, warmed up and then hot rolled.
• this plant flow diagram is the area of the CSP production line 1 between the casting machine 2 and the heating furnace 3, in which the surface treatment according to the invention is carried out, highlighted in dashed lines.
• FIG. 2 shows, correspondingly enlarged, the dashed region of FIG. 1 in a side view, beginning with the outlet straightening drivers 6 of the CSP casting machine 2 with a subsequently arranged shears 7 for producing slab partial lengths.
• the surface treatment device 20 consisting of a low-pressure or high-pressure scale scrubber 22 for removing the naturally occurring scale, an oxidation device 21 with nozzles or nozzle-like device, with an oxidizing flame or an oxidizing gas mixture is applied selectively to the surface of the slab 5 and wetting nozzles 23 for cooling with, for example, water and brittle the generated oxide layers and the newly formed Zunders.
• FIG. 2 shows an alternative surface treatment device 20 in the direction of production 1 1 in front of the shears 7. Compared to FIG. 2, there are no further changes, so that the reference numerals and the surface treatment described in FIG. 2 are also valid for FIG.
• FIGS. 4 and 5 Another possible alternative displacement of the surface treatment device 20 is shown in FIGS. 4 and 5.
• this dashed region of Figure 4 is shown enlarged in a side view.
• the surface treatment device 20 between the heating furnace 3 is in the production direction 1 1, the surface treatment device 20 between the heating furnace 3 and a pair of scissors 7.
• the before (in this drawing figure Not shown) Warm rolling mill 4 existing conventional high-pressure scale scrubber 10 are used, so that the low-pressure scale scrubber 9 used in Figures 2 and 3 can be saved.
• the roller pair 8, which is required for the mechanical breaking up of the surface layers formed can advantageously serve as a pair of driving rollers for the existing high-pressure scale scrubber 10.
• the other devices provided with the same reference numerals and the implementation of the surface treatment of the description correspond to the drawing figure. 2

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Continuous Casting (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (2)

Family Cites Families (15)

• 2010
  • 2010-01-14 DE DE102010004563A patent/DE102010004563A1/de not_active Withdrawn
• 2011
  • 2011-01-10 US US13/522,355 patent/US8572826B2/en not_active Expired - Fee Related
  • 2011-01-10 MY MYPI2012700468A patent/MY165842A/en unknown
  • 2011-01-10 BR BR112012017387A patent/BR112012017387B1/pt not_active IP Right Cessation
  • 2011-01-10 WO PCT/EP2011/050196 patent/WO2011086040A2/de not_active Ceased
  • 2011-01-10 KR KR1020127020432A patent/KR101436843B1/ko not_active Expired - Fee Related
  • 2011-01-10 JP JP2012548394A patent/JP2013517138A/ja active Pending
  • 2011-01-10 RU RU2012134645/02A patent/RU2522409C2/ru not_active IP Right Cessation
  • 2011-01-10 EP EP11700333.5A patent/EP2523774B1/de not_active Not-in-force
  • 2011-01-10 UA UAA201209785A patent/UA104791C2/ru unknown
  • 2011-01-10 CN CN201180013923.5A patent/CN102791413B/zh not_active Expired - Fee Related
• 2013
  • 2013-11-14 JP JP2013235833A patent/JP5758970B2/ja not_active Expired - Fee Related

Patent Citations (2)

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