CN113260467A - Apparatus and method for treating rolled material - Google Patents

Apparatus and method for treating rolled material Download PDF

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Publication number
CN113260467A
CN113260467A CN201980087802.1A CN201980087802A CN113260467A CN 113260467 A CN113260467 A CN 113260467A CN 201980087802 A CN201980087802 A CN 201980087802A CN 113260467 A CN113260467 A CN 113260467A
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CN
China
Prior art keywords
rolled material
sacrificial layer
ironmaking
continuous casting
material processing
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Pending
Application number
CN201980087802.1A
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Chinese (zh)
Inventor
林承昊
姜润熙
金亨晋
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Posco Holdings Inc
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Posco Co Ltd
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Publication of CN113260467A publication Critical patent/CN113260467A/en
Pending legal-status Critical Current

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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
    • B21B45/002—Increasing friction between work and working rolls by using friction increasing substance
    • 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
    • B21B45/004—Heating the product
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0287—Cleaning devices removing solid particles, e.g. dust, rust
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

An apparatus and method for processing rolled material is disclosed. An apparatus for processing a rolled material according to an embodiment of the present invention includes: a pretreatment device for removing defects and foreign matters on the surface of a rolled material discharged from a continuous casting machine; and a sacrificial layer applying device that applies steel slag to a surface of the rolled material conveyed after passing through the pre-treating device in a spraying direction to form a sacrificial layer.

Description

Apparatus and method for treating rolled material
Technical Field
The present disclosure relates to a rolled material processing apparatus and a processing method capable of preventing scale and grain boundary oxidation from being generated on a surface when a rolled material is heated.
Background
When hot rolling is performed, a rolled material (e.g., a cast product and a steel product) is heated to 1100 degrees or more in a heating furnace and then fed into a rolling mill. Since the rolled material is rapidly oxidized by an oxidizing atmosphere (e.g., oxygen or water vapor) inside the heating furnace, scale is generated on the surface.
The scale generated on the surface of the rolled material generates cracks on the surface of the rolled material by high-temperature grain boundary oxidation, thereby causing linear defects in the rolling direction during the rolling process, and is crushed on the surface to deteriorate the surface quality of the rolled product. In addition, the scale forms a locally hardened layer by surface decarburization, resulting in a decrease in the actual yield of products due to the generation of the scale.
Generally, in order to reduce the generation of scale, there is a case where a heating furnace is filled with an inert gas to form a non-oxidizing atmosphere. However, in this method, it is not easy to control the inside of the heating furnace with an inert gas atmosphere.
Disclosure of Invention
Technical problem
The present disclosure aims to provide a rolled material processing apparatus and a processing method capable of preventing scale and grain boundary oxidation from being generated on the surface when a rolled material is heated.
Technical scheme
One aspect of the present disclosure provides a rolled material processing apparatus including: a pretreatment device for removing defects and foreign matters on the surface of a rolled material discharged from a continuous casting machine; and a sacrificial layer applying device configured to apply ironmaking by-products to a surface of the rolled material conveyed through the pretreatment device in a thermal spraying normal to form a sacrificial layer for generating scale during heat treatment in the heating furnace.
The pretreatment device and the sacrificial layer application device may be continuously disposed on a transfer line connected to an outlet side of the continuous casting machine to continuously perform the treatment until the sacrificial layer is generated in the continuous casting.
The pretreatment device may include a rotary brush provided to remove foreign matter from the surface of the rolled material, and a compressed air ejector provided to eject compressed air onto the surface of the rolled material.
The pretreatment device may include at least one of a scarfing device configured to scarify a surface of the rolled material and a grinder configured to grind the surface of the rolled material.
The sacrificial layer applying device may include: a plurality of thermal spraying nozzles continuously arranged in a width direction of the rolled material to be conveyed to melt the iron-making by-product and spray the melted iron-making by-product onto a surface of the rolled material; and an ironmaking byproduct feeder configured to supply ironmaking byproducts in powder form to the plurality of hot spray nozzles.
One aspect of the present disclosure provides a rolled material processing method including: the method includes a continuous casting process of producing a rolled material by continuous casting, a pretreatment process of removing defects and foreign substances on a surface of the rolled material produced by the continuous casting process, a sacrificial layer application process of applying an ironmaking byproduct to the surface of the rolled material subjected to the pretreatment process with a thermal spraying method to form a sacrificial layer for producing scale, and a heating process of feeding the rolled material in which the sacrificial layer is applied to the surface of the rolled material into a heating furnace to heat the rolled material to a temperature at which rolling is performed.
The sacrificial layer application process may include maintaining the rolled material at a temperature of 500 to 800 degrees to facilitate attachment of hot sprayed ironmaking byproducts to the surface.
The sacrificial layer application process may include: a filtering process for making the particle size uniform by filtering the ironmaking byproduct in the form of powder with a screen; and a spraying process of melting the iron making by-product powder subjected to the filtering process using a hot spraying nozzle and spraying the molten iron making by-product on a surface of the rolled material while the rolled material is transferred.
The ironmaking by-product may comprise at least one of dust-collected scale, scarfing scale, and iron-containing dust.
Advantageous effects
According to the rolled material treatment method according to one embodiment of the present disclosure, since the sacrificial layer on the surface of the rolled material is scaled in the heating furnace instead of the surface of the rolled material to protect the surface of the rolled material, the loss of the surface of the rolled material and the grain boundary oxidation can be prevented. Therefore, the actual yield of the rolled material to be supplied to the rolling mill after heating can be improved.
According to the rolled material processing method according to one embodiment of the present disclosure, since the pretreatment process is performed after the continuous casting process and then the sacrificial layer application process is immediately performed, the temperature at which the sacrificial layer is easily applied to the rolled material is maintained without separately heating the rolled material, so that the sacrificial layer can be smoothly applied on the surface of the rolled material.
According to the method for treating a rolled material according to one embodiment of the present disclosure, since a sacrificial layer is formed on the surface of the rolled material by using ironmaking byproducts (e.g., dust-collected scale, scarfing scale, and iron-containing dust) that can be easily obtained from a steel mill, not only can the treatment cost be reduced, but also an environmentally friendly treatment can be realized.
Drawings
Fig. 1 shows a continuous casting rolling facility to which a rolled material processing facility according to one embodiment of the present disclosure is applied.
Fig. 2 illustrates a rolled material processing apparatus according to one embodiment of the present disclosure.
Fig. 3 shows a sacrificial layer applying apparatus of a rolled material processing apparatus according to one embodiment of the present disclosure.
Fig. 4 shows the states of the respective processes of the rolled material processed using the rolled material processing apparatus according to one embodiment of the present disclosure.
Fig. 5 illustrates a process of a rolled material processing method according to one embodiment of the present disclosure.
Detailed Description
Hereinafter, one embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present disclosure to those of ordinary skill in the art to which the present disclosure pertains, and the present disclosure is not limited to the embodiments shown herein but may be presented in other forms. The drawings are not intended to limit the scope of the present disclosure in any way, and the dimensions of the components may be exaggerated for clarity of illustration.
Fig. 1 shows a continuous casting rolling facility to which a rolled material processing facility according to one embodiment of the present disclosure is applied.
Referring to fig. 1, the continuous casting-rolling apparatus may include a continuous casting machine 10, a cutter 20, a pretreatment device 30, a sacrificial layer application device 40, a loading area 50, a heating furnace 60, a rolling mill 70, a cooling table (not shown), a coiler (not shown), and the like.
The continuous casting machine 10 may produce a rolled material 100 such as a slab, a bloom, and a billet, and the cutter 20 may cut the continuously produced rolled material 100 into an appropriate length. Thereafter, the rolled material 100 may pass through the pretreatment device 30 while being conveyed along the conveying line 80 such that defects and foreign substances on the surface thereof are removed, and may be loaded into the loading region 50 after a sacrificial layer is generated on the surface thereof while passing through the sacrificial layer application device 40.
The rolled material 100 in the loading area 50 may be heated in the heating furnace 60 to a temperature at which rolling takes place and then supplied to the rolling mill 70 for rolling, and the rolled product, such as a strip, may be cooled through a cooling stand and then wound into a coil product 90 in a winding machine.
In this embodiment, as described above, the rolled material processing apparatus includes the pretreatment device 30 and the sacrificial layer application device 40, and these devices may be continuously provided on the conveying line 80 connected to the outlet side of the continuous casting machine 10.
Since the rolled material processing apparatus is continuously provided on the transfer line 80 connected to the outlet side of the continuous casting machine 10 with the pretreatment device 30 and the sacrificial layer application device 40 on the transfer line 80, the rolled material processing apparatus can continuously manufacture the rolled material 100 and generate the sacrificial layer 110 on the surface thereof at the time of continuous casting.
Therefore, as shown in fig. 5, after performing a continuous casting process 201 of producing the rolled material 100 by continuous casting and a cutting process 202 of cutting the produced rolled material 100 with the slitter 20, the continuous casting and rolling facility may continuously perform a pretreatment process 203 of removing defects and foreign matters on the surface of the rolled material 100 conveyed to the pretreatment device 30 along the conveying line 80, and a sacrificial layer application process 204 of forming the sacrificial layer 110 by applying ironmaking by-products on the surface of the rolled material 100 conveyed to the sacrificial layer application device 40. Further, the continuous casting-rolling facility may perform a heating process 205 of bringing the rolled material 100 loaded in the loading area 110 into the heating furnace 60 in a state in which the sacrificial layer 110 is applied to heat the rolled material 100 to a temperature at which rolling is performed.
Referring to fig. 1 and 2, the pretreatment device 30 performs a pretreatment process 203 of removing defects or foreign matters on the surface of the rolled material 100 discharged from the continuous casting machine 10.
The pretreatment device 30 may include a rotating brush 31 configured to remove foreign matter from the surface of the rolled material 100 and a compressed air ejector 32 configured to remove foreign matter by ejecting high-pressure compressed air onto the surface of the rolled material 100, as in the example of fig. 2.
Although not shown in the drawings, the pretreatment device 30 may include a scarfing device configured to remove defects on the surface by scarfing by radiating a flame onto the rolled material 100, and a grinder configured to remove defects by grinding the surface of the rolled material 100. The scarfing device or the grinding device can remove not only coarse scale generated on the surface of the rolled material 100 during the cooling process of the continuous casting process 201 but also a scale layer and defects infiltrated into the surface.
The sacrificial layer applying apparatus 40 performs a sacrificial layer applying process 204 of forming the sacrificial layer 110 by applying ironmaking by-products in the form of powder to the surface of the rolling material 100 conveyed through the pre-treatment apparatus 30 by a thermal spraying method. The ironmaking by-product may comprise at least one of dust-collected scale, scarfing scale, and iron-containing dust. The iron-making by-product is suitable as a material of the sacrificial layer 110 because the iron-making by-product has a relatively uniform particle size, good fluidity, and is produced in large quantities in a steel mill.
As shown in fig. 2 and 3, the sacrificial layer applying device 40 may include: a plurality of thermal spray nozzles 41 continuously arranged in a width direction of the rolled material 100 to be conveyed to melt the iron-making by-product and spray the molten iron-making by-product on a surface of the rolled material 100, and an iron-making by-product feeder 42 provided to supply the iron-making by-product to the plurality of thermal spray nozzles 41.
The ironmaking byproduct feeder 42 may perform a filtering process for making particle sizes uniform by filtering ironmaking byproducts in the form of powder with a screen, and the plurality of hot spray nozzles 41 may perform a spraying process for melting ironmaking byproduct powder subjected to the filtering process while the rolling material 100 is conveyed and spraying the melted ironmaking byproducts on the surface of the rolling material 100.
During the sacrificial layer application process 204, the rolled material 100 is maintained at a temperature of 500 to 800 degrees so that hot sprayed ironmaking byproducts easily attach to the surface of the rolled material 100. In this embodiment, since the sacrificial layer applying process 204 is performed immediately after the pretreatment process 203 is performed after the continuous casting process 201, the temperature of the rolled material 100 can be maintained at 500 to 800 degrees even without separately heating the rolled material 100. Therefore, the sacrificial layer 110 can be smoothly applied to the surface of the rolled material 100. The thickness of the applied sacrificial layer 110 may be 50 μm to 1 mm.
As shown in fig. 3, the plurality of thermal spraying nozzles 41 may be continuously arranged to be wider than the width of the rolled material 100 in the width direction of the rolled material 100, and the plurality of thermal spraying nozzles 41 may be selectively operated under control such that the thermal spraying area corresponds to the width of the rolled material 100.
As in the example of fig. 3, only the thermal spraying nozzles 41 located above the rolled material 100 may be controlled to thermally spray the iron-making by-products, and the thermal spraying nozzles 41 located on the opposite side of the rolled material 100 may be controlled to limit the spraying. In the same manner, the plurality of thermal spraying nozzles 41 can variously adjust the thermal spraying width or the thermal spraying area. That is, the thermal spraying may be controlled such that the sacrificial layer 110 is formed only in the central portion or at the opposite side of the conveyed rolled material 100, or may be controlled such that the sacrificial layer 110 is formed only at the front end or the rear end of the rolled material 100.
Referring to fig. 4, the rolled material 100 subjected to the pretreatment process 203 assumes a state in which the surface thereof has been removed of defects and foreign substances, as shown in fig. 4 a. In this state, the rolled material 100 is subjected to a sacrificial layer application process 204 and a sacrificial layer 110 is formed on the surface thereof, as in the example of fig. 4 b. Thereafter, as in the example of fig. 4b, the rolled material 100 having the sacrificial layer 110 formed on the surface thereof is loaded in the loading area 50, and then introduced into the heating furnace 60 to be heated to a temperature at which rolling is performed.
When the rolled material 100 having the sacrificial layer 110 formed on the surface in the state of fig. 4b is introduced into the heating furnace 60, the sacrificial layer 110 scales instead of the surface of the rolled material 100, so that the surface of the rolled material 100 can be protected. Therefore, the loss of the surface of the rolled material 100 and the grain boundary oxidation can be prevented, and thus the actual yield of the product can be improved.
Therefore, the rolled material 100, on the surface of which the scale and foreign matter have been removed, hardly suffers any loss of its surface after being heated in the heating furnace 60, as shown in fig. 4 c. That is, since the sacrificial layer 110 is instead oxidized in the heating furnace 60, the rolled material 100 of fig. 4c in a state in which heating is completed and the rolled material 100 of fig. 4a in a state before the sacrificial layer 110 is applied can be in almost equivalent states.

Claims (9)

1. A rolled material processing apparatus comprising:
a pretreatment device configured to remove defects and foreign matters on a surface of a rolled material discharged from a continuous casting machine; and
a sacrificial layer application device configured to apply ironmaking by-products to the surface of the rolled material conveyed through the pretreatment device in a thermal spray normal to form a sacrificial layer for scale production during heat treatment in a furnace.
2. The rolled material processing apparatus according to claim 1, wherein
The pretreatment device and the sacrificial layer application device are continuously disposed on a conveyance line connected to an outlet side of the continuous casting machine to continuously perform a treatment in continuous casting until the sacrificial layer is generated.
3. The rolled material processing apparatus according to claim 1, wherein
The pretreatment device includes a rotating brush provided to remove foreign matter from the surface of the rolled material, and a compressed air ejector provided to eject compressed air onto the surface of the rolled material.
4. The rolled material processing apparatus according to claim 1, wherein
The pretreatment device includes at least one of a scarfing device configured to scarify the surface of the rolled material and a grinder configured to grind the surface of the rolled material.
5. The rolled material processing apparatus according to claim 1, wherein
The sacrificial layer applying device includes:
a plurality of thermal spraying nozzles continuously arranged in a width direction of the rolled material to be conveyed to melt the ironmaking by-product and spray the melted ironmaking by-product on the surface of the rolled material; and
an ironmaking byproduct feeder disposed to supply the ironmaking byproduct in powder form to the plurality of hot spray nozzles.
6. A rolled material processing method comprising:
a continuous casting process for producing a rolled material by continuous casting;
a pretreatment process of removing defects and foreign matters on the surface of the rolled material produced by the continuous casting process;
a sacrificial layer applying process of applying ironmaking by-products to the surface of the rolled material having undergone the pretreatment process with thermal spraying to form a sacrificial layer for scale production; and
a heating process of bringing the rolled material in which the surface of the rolled material is applied with the sacrificial layer into a heating furnace to heat the rolled material to a temperature at which rolling is performed.
7. The rolled material processing method according to claim 6, wherein
The sacrificial layer application process includes maintaining the rolled material at a temperature of 500 to 800 degrees to facilitate attachment of hot sprayed ironmaking byproducts to the surface.
8. The rolled material processing method according to claim 7, wherein
The sacrificial layer application process includes:
a filtering process for making a particle size uniform by filtering the ironmaking byproduct in a powder form with a screen; and
a spraying process of melting the powder of the iron making by-product having passed through the filtering process using a hot spraying nozzle while the rolled material is conveyed and spraying the melted iron making by-product on the surface of the rolled material.
9. The rolled material processing method according to claim 6, wherein
The ironmaking byproduct comprises at least one of a dust-collected scale, a scarfing scale, and iron-containing dust.
CN201980087802.1A 2018-11-27 2019-11-27 Apparatus and method for treating rolled material Pending CN113260467A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020180148977A KR102170939B1 (en) 2018-11-27 2018-11-27 Rolling material processing equipment and processing method
KR10-2018-0148977 2018-11-27
PCT/KR2019/016467 WO2020111773A1 (en) 2018-11-27 2019-11-27 Facility and method for processing rolling material

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CN113260467A true CN113260467A (en) 2021-08-13

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WO (1) WO2020111773A1 (en)

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