KR20170092204A - Method of surface treatment for cold rolled carbon steel sheet, and steel sheet thereby - Google Patents

Method of surface treatment for cold rolled carbon steel sheet, and steel sheet thereby Download PDF

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Publication number
KR20170092204A
KR20170092204A KR1020160013231A KR20160013231A KR20170092204A KR 20170092204 A KR20170092204 A KR 20170092204A KR 1020160013231 A KR1020160013231 A KR 1020160013231A KR 20160013231 A KR20160013231 A KR 20160013231A KR 20170092204 A KR20170092204 A KR 20170092204A
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South Korea
Prior art keywords
steel sheet
cold
rolled steel
polishing
sandpaper
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Application number
KR1020160013231A
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Korean (ko)
Inventor
김성용
Original Assignee
주식회사 에이제이테크
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Priority to KR1020160013231A priority Critical patent/KR20170092204A/en
Publication of KR20170092204A publication Critical patent/KR20170092204A/en

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
    • B24B21/14—Contact wheels; Contact rollers; Belt supporting rolls
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

The present invention relates to a surface treatment method for a cold rolled carbon steel sheet and a steel sheet manufactured by the same and, more specifically, relates to a surface treatment method for a cold rolled carbon steel sheet and a steel sheet manufactured by the same, wherein material costs of the steel sheet is inexpensive to have economic feasibility, and the steel sheet is easily processed. Moreover, surface gloss is not damaged, and corrosion resistance is excellent to be variously utilized in vehicles, home appliances, construction materials, or the like. The surface treatment method comprises: a cold rolled carbon steel sheet manufacturing step of manufacturing a cold rolled carbon steel sheet with a souring process and a rolling process with a hot rolled coil as a material; a polishing treatment step of polishing and treating a surface through a polishing process on a surface of the cold rolled carbon steel sheet; and a coating step of coating the surface with a plating process on the surface of the cold rolled carbon steel sheet of which the surface is polished and treated.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of machining a surface of a cold-rolled steel sheet and a metal sheet produced by the method,

TECHNICAL FIELD The present invention relates to a method of machining a surface of a cold-rolled steel sheet and to a metal sheet produced by the method. More specifically, the present invention relates to a method of improving surface gloss and corrosion resistance of a cold rolled carbon steel sheet The surface of the cold-rolled steel sheet is subjected to sandpaper grinding or hairline processing, and then galvanized or tin-plated (stone)

A galvanic coating, an aluminum plating, or a color painting, and a metal steel sheet produced by the method.

In general, a metal plate material for forming an exterior of an automobile, a washing machine, or a refrigerator should have a good appearance and a good appearance, and must have corrosion resistance that is not easily corroded by moisture or the like.

Accordingly, it is preferable to use stainless steel, which is known to have excellent corrosion resistance and glossiness during surface polishing. However, the stainless steel sheet is expensive in material itself and has a poor processability such as a press process There is a problem that economical efficiency and productivity are deteriorated.

A cold rolled carbon steel sheet (CR) is used as a substitute for the stainless steel sheet.

The cold-rolled steel sheet is a hot-rolled steel sheet, which has been subjected to a pickling process to remove the surface scale, rolled to a thickness of about 0.153 mm, and then subjected to annealing and temper rolling. It is used directly in automobile, household appliances, furniture, office supplies, vehicles, building materials, etc., or is used as a plate for plating zinc, aluminum, tin and chrome.

However, when the cold-rolled steel sheet is used as it is, or when the cold-rolled steel plate is used by powder coating or galvanizing, for example, various patterns can not be put on the steel plate. (No. 4 surface processing) or hair line (HL) processing to add or polish a specific pattern on an Electrolytic Galvanized Iron (EGI) or a Galvanized Iron (GI) There is a problem that the corrosion resistance is poor because the plating layer is easily peeled off and thus it is easily corroded.

The present invention, which has been devised to solve all of the above problems, is an economical steel plate which is inexpensive because it is inexpensive and can be easily processed, does not hinder the surface gloss and is excellent in corrosion resistance and can be used for various purposes such as automobiles, home appliances, And to provide a method of processing a surface of a cold-rolled steel sheet and a metal sheet produced by the method.

In order to accomplish the above object, the present invention provides a method for processing a surface of a cold-rolled steel sheet, comprising: a cold-rolled steel sheet production step for producing a cold-rolled steel sheet by a pickling process and a rolling process; And a coating step of coating the surface of the cold-rolled steel sheet subjected to the surface-polishing treatment by a plating process.

As a preferred embodiment, the polishing process may be a polishing process using a sandpaper.

In the sandpaper grinding step, the surface of the cold-rolled steel sheet drawn out from the first cold-rolled steel sheet roller can be polished by sequentially contacting at least one or a plurality of sandpaper rollers.

At this time, the roller meshes of the plurality of sandpaper rollers are gradually and gradually formed.

In a preferred embodiment, the sandpaper grinding step may be a surface grinding process of No. 4 (# 4) of surface cold-rolled steel sheet or a hair line (HL) surface grinding process.

As a preferred embodiment, the coating step may be electro-galvanizing or hot-dip galvanizing.

According to the present invention, since a cold-rolled steel sheet having a relatively lower price than a stainless steel sheet is used, it is economical and excellent in workability and can be variously adjusted in thickness and shape.

Further, since the surface of the cold-rolled steel sheet is subjected to a polishing process such as sandpapering or hairline processing, and then the surface thereof is subjected to a plating process, a variety of patterns can be added to the surface thereof, There is an advantage that gloss and corrosion resistance are improved such as excellent gloss and not easily corroded by moisture and the like.

1 is a block diagram showing a surface machining method of a cold-rolled steel sheet according to an embodiment of the present invention.
2 is a view showing a sandpaper polishing process of a cold-rolled steel sheet according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, which show preferred embodiments of the present invention.

It should be understood, however, that there is no intention to limit the invention to the particular form disclosed, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. A detailed description thereof will be omitted.

1 is a block diagram showing a surface machining method of a cold-rolled steel sheet according to an embodiment of the present invention.

1, a method for machining a surface of a cold-rolled steel sheet according to the present invention comprises a cold-rolled steel sheet manufacturing step (S1) for producing a cold-rolled steel sheet by a pickling process and a rolling process, A surface polishing step S2 for polishing the surface through a polishing process, and a coating step S3 coating a surface of the surface-polished cold-rolled steel sheet by a plating process.

More specifically, the step (S1) of manufacturing the cold-rolled steel sheet is performed by pickling, cold rolling, annealing, temper rolling, and the like, and thus detailed description thereof will be omitted. The surface polishing step S2 of the present invention is for polishing the surface of the cold-rolled steel sheet to form fine irregularities to improve the tackiness of the surface coating and to form a gloss. ≪ / RTI >

FIG. 2 is a view showing a sandpaper grinding process of the cold-rolled steel sheet according to the embodiment of the present invention. As shown in FIG. 2, the grinding process using the sandpaper is performed by grinding the cold-rolled steel sheet 10 are successively brought into contact with at least one or a plurality of sandpaper rollers 20 and polished.

The cold-rolled steel sheet 10 surface-polished by the sandpaper roller 20 can be rewound back to the second cold-rolled steel sheet roller 12 for commercialization.

At this time, the cold-rolled steel sheet 10 polished by the sandpaper roller 20 can be removed from the surface foreign substances generated during the polishing process while being in contact with the scrapers 30 made of rubber or the like. Further, the surface drying treatment can be performed by the hot air dryer 40 to remove the water sprayed for removing frictional heat with the sandpaper roller 20. [

When a plurality of sandpaper rollers are formed in the surface polishing process as shown in Fig. 2, the meshes of the sandpaper rollers are sequentially formed gradually and densely. For example, if the surface of the first roller 21 is 800 mesh, the second roller 22 is arranged in the form of 1000 mesh, the third roller 23 in the form of 1100 mesh and the fourth roller 24 in the form of 1200 mesh In this way, the surface of the cold-rolled steel sheet can be gradually and densely polished.

The surface of the sandpaper roller is polished by an abrasive of 150 to 180 mesh according to KS L6001 (abrasive grain size regulation) to form the surface of the cold-rolled steel sheet according to No. 4 (# 4) A surface according to a hair line (HL) in which a continuous pattern is formed using an abrasive belt of 150 to 180 mesh can be formed on the product surface of the cold-rolled steel sheet according to .4 (# 4) The steel sheet is classified according to the density or the degree of gloss of the surface as follows.

No.1: Surface of product after hot rolling and pickling treatment

No.2B: The surface of the product after cold rolling, after heat treatment and pickling treatment,

No.3: The surface of the product obtained by polishing the product of No. 2B with an abrasive belt of 100 to 120 mesh

No.4: The surface of the product obtained by polishing the product of No. 2B with an abrasive belt of 150 to 180 mesh

HL (Hair Line): The surface of the product which was processed so as to form a continuous pattern by using an abrasive belt of No. 150 to 180 mesh

In the present invention, the surface of the cold-rolled steel sheet after the polishing process is not limited to the above-mentioned classification table. However, in order to obtain a surface suitable for use in household appliances and building materials, it is preferable to process N0.4 or HL.

1, the coating step S3 includes zinc plating such as electro-galvanizing and hot-dip galvanizing, tin plating (gypsum plating), galvanization (GV) plating, aluminum plating or color painting. The plating is performed in the state of the cold-rolled steel sheet as described above, after the No. 4 or HL polishing treatment, and then zinc is electroplated by the electric action. In this way, Electrolytic Galvanized Iron (EGI) .

Generally, electro galvanized steel sheet (EGI) is coated with zinc coating on the surface of cold rolled steel sheet or hot rolled steel sheet by electrolytic method,

It is generally known to have excellent coating finish and corrosion resistance after coating because it is less plated, uniform, and smooth as compared with the hot-dip galvanized steel sheet described below.

Compared with the above-mentioned electro-galvanizing, hot-dip galvanizing is a process of deepening a cold-rolled steel sheet into a zinc cylinder in which zinc is melted by heat and plating zinc on the surface thereof to produce a galvanized iron (GI).

The tin plating is used to coat tin after the surface-polishing treatment of the cold-rolled steel sheet. Tin has beautiful luster and is not easily discolored, and thus is used as a base plate for food containers or metal printing. When tin plating is performed in this way, a tin plate (STPE) is produced.

Aluminum plating is a method of coating aluminum after surface grinding treatment of a cold-rolled steel sheet. Aluminum has properties such as heat resistance, corrosion resistance, and heat reflection, and the aluminum-coated steel sheet (AL-COSTA, AL-COAT) do. Galvalume (GA) plating is performed by plating an alloy of aluminum and zinc, passing through a cold-rolled steel sheet surface-polished in an aluminum and zinc alloy bath to quench. The galvalume steel sheet is excellent in durability and heat resistance as compared with a cold rolled steel sheet or a galvanized steel sheet, has excellent heat reflectivity, and has a silver white surface appearance.

The color painting is such that a paint having a color is coated on a surface-polished cold-rolled steel sheet to exhibit a desired color.

Here, when the surface of the cold-rolled steel sheet is coated with the surface of the cold-rolled steel sheet by the surface polishing with sandpaper or the like and then galvanized as in the present invention, the adhesion of the cold-rolled steel sheet and the coating layer is improved, So that corrosion resistance and durability can be improved.

Although the present invention has been described in connection with the preferred embodiments described above, it will be appreciated by those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention, All such changes and modifications are intended to be within the scope of the appended claims.

10: Cold rolled steel plate
11: First cold-rolled steel plate roller
12: Second cold-rolled steel plate roller
20: sandpaper roller
30: Scraper
40: Hot air dryer

Claims (8)

A cold-rolled steel sheet manufacturing step for producing a cold-rolled steel sheet by a pickling process and a rolling process using a hot-rolled coil; A surface polishing step of polishing the surface of the cold-rolled steel sheet through a polishing process; And a coating step of coating a surface of the cold-rolled steel sheet subjected to the surface-polishing treatment by a plating process. The method according to claim 1,
Wherein the polishing step is performed by a sandpaper. 3. The method of claim 2,
Wherein the sandpaper grinding step comprises grinding the surface of the cold-rolled steel sheet drawn out from the first cold-rolled steel sheet roller by sequentially contacting at least one or a plurality of sandpaper rollers. The method of claim 3,
Wherein each of the roller meshes of the plurality of sandpaper rollers is gradually densely formed in order. 3. The method of claim 2,
Wherein the sandpaper polishing step is a surface grinding process of No. 4 (# 4) of the surface-classified cold-rolled steel sheet or a hair line (HL) surface grinding process. The method according to claim 1,
Wherein the coating step is any one of electro-galvanizing, hot-dip galvanizing, tin plating, aluminum plating, galvanic plating, and color painting. The method according to claim 1,
Wherein the surface of the cold-rolled steel sheet is contacted with a scraper so as to remove foreign matter remaining on the surface after the polishing step, or the hot-air is dried to remove water introduced in the wet polishing step. A metal plate produced by the method for surface processing a cold-rolled steel sheet according to any one of claims 1 to 7.
KR1020160013231A 2016-02-03 2016-02-03 Method of surface treatment for cold rolled carbon steel sheet, and steel sheet thereby KR20170092204A (en)

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KR1020160013231A KR20170092204A (en) 2016-02-03 2016-02-03 Method of surface treatment for cold rolled carbon steel sheet, and steel sheet thereby

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190077730A (en) * 2017-12-26 2019-07-04 주식회사 포스코 Method and apparatus for refining magnetic domains grain-oriented electrical steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190077730A (en) * 2017-12-26 2019-07-04 주식회사 포스코 Method and apparatus for refining magnetic domains grain-oriented electrical steel

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