EP1760166B1 - Verfahren zur Herstellung eines Stahlrohres mit verbesserter Korrosionbeständigkeit - Google Patents

Verfahren zur Herstellung eines Stahlrohres mit verbesserter Korrosionbeständigkeit Download PDF

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Publication number
EP1760166B1
EP1760166B1 EP06116733.4A EP06116733A EP1760166B1 EP 1760166 B1 EP1760166 B1 EP 1760166B1 EP 06116733 A EP06116733 A EP 06116733A EP 1760166 B1 EP1760166 B1 EP 1760166B1
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EP
European Patent Office
Prior art keywords
steel tube
plating
alloy
molten alloy
plating part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP06116733.4A
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English (en)
French (fr)
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EP1760166A3 (de
EP1760166A2 (de
Inventor
Gi Hyeoug Kim
Sun Chang Kim
Jae Pyeong Sim
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Korea Bundy Co Ltd
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Korea Bundy Co Ltd
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Publication of EP1760166A3 publication Critical patent/EP1760166A3/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • 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
    • B05D7/146—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 to metallic pipes or tubes
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • 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
    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • 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
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • 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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • C23C2/00362—Details related to seals, e.g. magnetic means
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/12—Aluminium 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
    • 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
    • C23C2/26—After-treatment
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer

Definitions

  • the present invention relates to a method for manufacturing a steel tube, and more particularly to a method for manufacturing a steel tube according to the preamble portion of claim 1.
  • a steel tube obtained through the latter method is called an electric weld tube since a steel plate is transformed to a tube and its contacts are welded through electric resistance welding.
  • small bore steel tubes are broadly used as a condenser for cooler equipment such as refrigerators or a hydraulic brake line, in which high durability and high reliability are required. Therefore, the small bore steel tube must be carefully managed from its manufacturing process.
  • US 3,559,280 discloses a method comprising the features of the preamble portion of claim 1. More specifically, US 3,559,280 teaches an apparatus for tube forming, galvanizing and colour coating of a steel strip in a continuous operation. The coating is a Zn alloy and galvanizing is performed while the steel strip is conveyed horizontally.
  • JP 2003-166078 A discloses a coated steel tube wherein a corrosion resistant coating alloy is a hot dip Al-Zn alloy containing 55 wt% of aluminum and 43.4-44.9 wt.% of zinc. JP 2003-166078 A confirms the fact of improved corrosion resistance through the alloy. In addition, JP 2003-166078 A teaches a trivalent chromium layer and resin layers.
  • US 2003/0135979 A1 discloses another horizontal coating method for a steel tube.
  • US 3,738,312 discloses vertical hot dip coating of linear material by aluminum, zinc, or copper.
  • the corresponding pot for the melt includes a protruded part for vertical coating of the linear material.
  • the level of the melt in the pot is controlled by a level block.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide another method for manufacturing a steel tube having a corrosion resistant coating.
  • the steel tube manufactured by the above-described manufacturing method has a uniform surface and improved corrosion-resistance.
  • Fig. 1 is a schematic view showing the configuration of an apparatus for manufacturing a steel tube with superior corrosion-resistance, according to one embodiment of the present invention.
  • a steel tube is first formed in coil shape by a coiler through a milling process before it is taken in the steel tube manufacturing apparatus of the present invention. That is, the milling process is carried out in a separate line.
  • the steel tube 1 brought in the steel tube manufacturing apparatus is straightened or uncoiled by an uncoiler 3, and the surface of the steel tube 1 is chemically treated in a chemical treatment apparatus 5 with a solution containing various kinds of acids or surfactants. Through this process, foreign substances on the surface of the steel tube can be removed. Following the chemical treatment, oxidated substances attached to the surface of the steel tube are physically removed through high-speed rotation of a wire brush for example. Later, the surface of the steel tube is cleansed by water and air.
  • the steel tube 1 passes through an apparatus for manufacturing a steel tube excellent in corrosion-resistance, in which the apparatus is constituted by a preheating apparatus 7, a pre-treating apparatus 10, a plating apparatus 20 and a resin coating apparatus 18.
  • the apparatus is constituted by a preheating apparatus 7, a pre-treating apparatus 10, a plating apparatus 20 and a resin coating apparatus 18.
  • the preheating apparatus 7 preheats the steel tube 1 having passed through the milling process. To this end, the preheating apparatus 7 preheats the steel tube to approximately 600°C or higher using an induction heater. Once preheated, the steel tube becomes a flexible state and its surface is heated ready for pre-treatment or plating.
  • the pre-treating apparatus 10 maintains the temperature of the preheated steel tube 1 higher than a predetermined temperature, and creates a reduction atmosphere.
  • the pre-treating apparatus 10 includes at least one tube 11, a ceramic heater 12, and a gas injection unit 13.
  • the tubes 11 are arrayed in a line at regular intervals.
  • each tube 11 is kept warm, and the tubes 11 are arrayed in a manner that the steel tube 1 passes through their inside.
  • An exothermic ceramic heater 12 is installed on the circumferential surface of the tube 11 to ensure that the preheated steel tube is maintained at a higher temperature than the predetermined temperature.
  • the gas injection unit 13 injects hydrogen-nitrogen mixed gas into the tube 11 to create a reduction atmosphere.
  • the concentration of hydrogen gas, which is a reducing gas, in the hydrogen-nitrogen mixed gas ranges 5-25%, and the mixed gas is injected approximately three times as much of the internal volume of the tube 11 at atmospheric pressure.
  • the creation of a reduction atmosphere prevents the surface of the heated steel tube from getting easily oxidated to black, and helps the plating process (to be described) performed more stably.
  • the plating apparatus 20 is for plating the surface of the steel tube 1 with a corrosion resistant alloy.
  • the plating apparatus 20 includes a heater 22 and a pot 21 for storing a molten alloy.
  • Fig. 2 is a cross-sectional view of a steel tube with superior corrosion-resistance according to one embodiment of the present invention.
  • an alloy plating layer 101 is formed on the surface of the steel tube 100.
  • the alloy plating layer 101 contains 55 wt% of aluminum and 43.4-44.9 wt% of zinc (this is called a SeAHLume alloy), which provides substantially increased corrosion resistance.
  • the alloy further contains 0.1-1.6 wt% of silicon.
  • the heater 22 for melting the alloy is disposed below the pot 21 serves as a heating source for melting the alloy through injection heating.
  • the pot 21 is a vessel for storing the molten alloy, and has a protruded plating part 21 a formed on the path the steel tube 1 passes through. That is, part of the molten alloy flows into the plating part 21a and is used for plating the surface of the steel tube 1 that moves along the hole formed in the plating part 21 a.
  • the path the steel tube 1 takes to pass through the plating part 21a is disposed vertically. That is, the steel tube 1 moves vertically between an upper guide roller 31 and a lower guide roller 30.
  • This constitution allows the gravity to help the plating process for prevention of asymmetric plating, and ensures that a uniform plating layer is formed in a circumferential direction.
  • the steel tube 1 After rising vertically, the steel tube 1 is descended at an angle of predetermined degrees by the upper guide roller 31 for the next process.
  • the steel tube 1 arrives at a horizontal path again, it is cooled by an air cooling and water cooling apparatus 15. This cooling process involves air blasting and water spray quenching onto the surface of the steel tube.
  • a chromating apparatus 17 supplies chromium (III) to the surface of the steel tube for 5 seconds, more preferably, less than 1 second.
  • the resin coating apparatus 18 coats the surface of the plated steel tube with a synthetic resin.
  • the synthetic resin includes colorless nano-resins, more preferably, nylon resins.
  • Fig. 3 is a cross-sectional view of a steel tube with superior corrosion-resistance, according to another embodiment of the present invention.
  • a chromium (III) treated layer 101a is formed on the surface of the plating layer 101. Also, a coating layer 102 of nylon resin is formed on the surface of the chromate treated layer 101a. Both layers serve to improve corrosion-resistance of the steel tube 100.
  • Fig. 4 illustrates a plating apparatus according to one embodiment of the present invention. The following will now describe in detail the constitution of the plating apparatus with reference to Fig. 4 .
  • an induction heater 22 is disposed below the pot 21, and a plating part 21a is protrusively formed on one side of the pot 21.
  • the path of the steel tube 1 passing through the plating part 21a is disposed vertically, and an upper guide roller 31 and a lower guide roller 30 are installed at the upper end and the lower end of the vertical path, respectively, to guide the traveling of the steel tube.
  • the steel tube goes into the lower guide roller 30 along the horizontal direction over the ground surface, it is bent and then travels in the substantially vertical direction.
  • the lower guide roller 30 is surrounded by a case, and an auxiliary tool for adjusting the (radical) clearance caused by the difference in the outer diameter of the steel tube is installed inside the case.
  • the steel tube 1 passes the plating part, its surface is plated with an Al-Zn alloy (55 wt% of aluminum and 43.4-44.9 wt% of zinc). Desirably, the alloy further contains 0.1-1.6 wt% of silicon.
  • a level block 26 that selectively enters the pot 21 controls the level of a molten alloy to be flown into the plating part 21 a.
  • a separator 24 for defining an upper space is installed inside the pot 21, and the level block 26 is vertically movably mounted on one side of the separator 24.
  • the separator 24 prevents the fluctuation of the level of a molten alloy around the plating part 21 due to the vertical movement of the level block 26. For instance, when the level block 26 descends and sinks in a molten alloy, the level of the molten alloy increases and the alloy flows into the plating part. On the other hand, when the level block 26 ascends, the level of the molten alloy decreases and no alloy is supplied to the plating part 21 a.
  • a hole 21b through which the steel tube 1 passes is formed in the under surface of the plating part 21a, and a pressure control unit is further installed to prevent the leakage of the molten alloy through the hole 21b in the downward direction.
  • the pressure control unit is constituted by a lower nozzle apparatus 41 and a guide pipe 40.
  • the guide pipe 40 is connected to the case surrounding the lower guide roller 30, and an inert gas such as nitrogen is fed into the guide pipe 40 to maintain a 0.1-0.3 bar high-pressure state therein. Also, the upper end of the guide pipe 40 communicates with the lower nozzle apparatus 41, making the lower nozzle apparatus 41 in high-pressure state. In this manner, the molten alloy flown into the plating part 21a is not easily leaked downward.
  • the internal pressure of the pressure control unit including the guide pipe 40 and the lower nozzle apparatus 41 it becomes possible to uniformly plate the molten alloy on the surface of the steel tube that passes through the plating part 21 and travels in the vertical direction, and to prevent the leakage of the alloy in the downward direction.
  • a guide nozzle is formed at the upper and lower portions of the lower nozzle apparatus 41, respectively. This guide nozzle can be replaced if the outer diameter of a steel tube is changed.
  • the alloy can be uniformly plated over the surface of the steel tube 1 as it passes through the plating part 21 a.
  • the molten alloy that is plated on the surface of the steel tube 1 flows to one side and therefore, the thickness of plating on the surface of the steel tube is not asymmetric but uniform.
  • an upper nozzle apparatus 34 for spraying air or other mixed gas toward the steel tube is installed at the upper side of the plating part 21 a.
  • This upper nozzle apparatus 34 may have a constitution that enables to provide a very small amount of hydrogen gas to the steel tube and cause a flame therein for antioxidation.
  • the upper nozzle apparatus 34 may be used for blasting an inert gas such as nitrogen toward the steel tube 1 to adjust the thickness of the alloy plating used for the steel tube.
  • At least one tube-shaped cooling apparatus 32 encompassing the steep tube is disposed at the traveling path of the steel tube 1. This tube-shaped cooling apparatus 32 provides an air blast for cooling the surface of the steel tube 1 below the predetermined temperature.
  • the upper guide roller 31 is disposed at the upper end of the traveling path of the steel tube 1.
  • the steel tube 1 is bent by the upper guide roller 31 at an angle of about 30 degrees, and moves to the next cooling apparatus.
  • the subsequent processes from here are same as the ones described before referring to Fig. 1 .
  • Fig. 5 is a flow chart explaining the manufacturing method of the steel tube with superior corrosion-resistance.
  • a steel tube formed through a milling process is preheated (S10).
  • the surface of the steel tube becomes sufficiently flexible to be plated with an alloy.
  • the steep tube is preheated to a temperature higher than 600°C.
  • the reduction atmosphere is created while the temperature of the preheated steel tube is being maintained above the predetermined temperature (S20).
  • the reduction atmosphere can be created by injecting hydrogen-nitrogen mixed gas around the steel tube.
  • the alloy For plating, 55 wt% of aluminum and 43-45 wt% of zinc alloy is melted, and the molten Al-Zn alloy is plated over the surface of the steel tube (S30). Desirably, the alloy further contains 0.1-1.6 wt% silicon.
  • the Al-Zn alloy with such mixing ratio provides excellent corrosion-resistance to the steel tube.
  • the steel tube is plated as it passes vertically upwardly through the pot storing the molten alloy. While the steel tube passes through the plating part, the pressure control unit installed at the bottom of the plating part applies a pressure greater than the atmospheric pressure to prevent the leakage of the molten alloy in the downward direction.
  • the vertical path of the steel tube is guided by the upper and lower guide rollers.
  • the surface of the alloy plated steel tube is coated with a resin (S50).
  • a resin S50
  • a colorless nano-resin is used for coating the surface of the steel tube.
  • the resin contains a nylon resin.
  • the steel tube Before the coating process, the steel tube should be cooled below the predetermined temperature. To this end, a cooling process (S40) involving air blasting and cold water spray quenching is carried out.
  • chromating (III) process is performed in advance as part of the pretreatment for coating the steel tube with the resin.
  • the chromating process prevents discoloring of the steel tube and provides good appearance to the steel tube.
  • the surface of the steel tube is plated with the SeAHLume alloy and is coated with the nylon resin, corrosion-resistance of the steel tube is substantially increased. Therefore, when applied to a machine like a heat exchanger, it can guarantee a very stable operation.
  • the steel tube with superior corrosion-resistance and its manufacturing method of the present invention yield the following advantages.
  • the use of an alloy plating layer containing 55 wt% of aluminum and 43.4-44.9 wt% of zinc substantially increases corrosion-resistance of the steel tube.
  • the Al-Zn alloy can be uniformly plated over the surface of the steel tube along its circumferential direction.
  • the chromate (III) treatment is environmentally-friendly and improves the adhesives of the resin coating layer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (8)

  1. Verfahren zur Herstellung eines Stahlrohres (1) mit hervorragender Korrosionsbeständigkeit, wobei das Verfahren folgende Schritte umfasst:
    einen ersten Schritt zum Vorheizen des in einem Walzverfahren hergestellten Stahlrohres;
    einen zweiten Schritt zum Aufrechterhalten der Temperatur des vorgeheizten Stahlrohres oberhalb einer vorgegebenen Temperatur und Schaffen einer Reduktionsatmosphäre;
    einen dritten Schritt zum Schmelzen einer Al-Zn-Legierung, die 50 Gew.-% Aluminium und 41,4 - 44,9 Gew.-% Zink enthält, und Plattieren der geschmolzenen Legierung über die Oberfläche des Stahlrohres;
    einen vierten Schritt zum Abkühlen des Stahlrohres; und
    einen fünften Schritt zum Beschichten der Oberfläche des Stahlrohres mit einem Kunstharz,
    dadurch gekennzeichnet, dass
    der dritte Schritt das selektive Einsetzen eines Pegelblocks (26) in einen Behälter (21) beinhaltet, der die geschmolzene Legierung enthält, um den Pegel der geschmolzenen Legierung anzuheben, so dass die geschmolzene Legierung in einen Plattierungsteil (21a) fließt, der aus dem Behälter (21) vorsteht, und über die Oberfläche des Stahlrohres plattiert wird, das vertikal nach oben durch den Plattierungsteil (21a) verläuft, welcher die geschmolzene Legierung speichert;
    wobei ein Separator (24) zum Definieren eines oberen Raums in dem Behälter (21) installiert ist, während der Pegelblock (26) vertikal beweglich an einer Seite des Separators (24) montiert ist, um Schwankungen des Pegels der geschmolzenen Legierung um den Plattierungsteil (21a) herum aufgrund der vertikalen Bewegung des Pegelblocks (26) zu verhindern.
  2. Verfahren nach Anspruch 1, wobei die Legierung des Weiteren 0,1 - 1,6 Gew.-% Silizium umfasst.
  3. Verfahren nach Anspruch 1 oder 2, wobei in dem Schritt zum Schmelzen der Plattierungsprozess ausgeführt wird, während das Stahlrohr vertikal nach oben durch einen Plattierungsteil geführt wird, der die geschmolzene Legierung speichert, und Gas in Richtung des Stahlrohres gesprüht wird, um die Dicke des Legierungsüberzugs zu steuern.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei ein Druck größer als der atmosphärische Druck auf den Boden des Plattierungsteils mithilfe einer Drucksteuerungseinheit angelegt wird, um das Austreten der geschmolzenen Legierung zwischen dem Stahlrohr und dem Plattierungsteil in einer Richtung nach unten zu verhindern.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Reduktionsatmosphäre in dem Schritt zum Aufrechterhalten durch Einsprühen eines Wasserstoff-Sauerstoff-Gasgemisches um das Stahlrohr herum geschaffen wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei der Schritt zum Kühlen folgende Teilschritte umfasst:
    Durchführen von Druckluftbestrahlung des plattierten Stahlrohres; und
    Abschrecken des Stahlrohres unter Verwendung von kaltem Wasser.
  7. Verfahren nach einem der Schritte 1 bis 6, wobei ein Chromatierungsprozess (III) als Vorbehandlung des fünften Schrittes durchgeführt wird.
  8. Verfahren nach einem der Ansprüche 1 bis 7, wobei die Oberfläche des Stahlrohres in dem Schritt zum Beschichten mit einem farblosen Nylonkunstharz beschichtet wird.
EP06116733.4A 2005-09-02 2006-07-06 Verfahren zur Herstellung eines Stahlrohres mit verbesserter Korrosionbeständigkeit Expired - Fee Related EP1760166B1 (de)

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KR100988490B1 (ko) * 2008-06-26 2010-10-20 포스코강판 주식회사 용융 알루미늄-아연 도금 스테인레스 강판의 제조방법
KR101188855B1 (ko) 2010-02-26 2012-10-09 한국과학기술원 보강 금속 파이프의 제조 방법 및 장치
KR101094185B1 (ko) 2011-01-28 2011-12-14 (주)금강 피복 금속관의 제조방법 및 그 제조장치
JP5824868B2 (ja) * 2011-05-24 2015-12-02 新日鐵住金株式会社 亜鉛系めっき鋼材又は亜鉛系めっき鋼製成形品の製造方法
BR112014025697B1 (pt) * 2012-04-17 2020-10-20 ArcelorMittal Investigación y Desarrollo, S.L. chapa de aço dotada de um revestimento com proteção catódica sacrificial, processo de fabricação de uma peça de aço e peça de aço
KR101166886B1 (ko) 2012-04-23 2012-07-18 (주)금강 환형으로 권취가 용이한 금속 수지 복합관 및, 그 제조방법
CN103361587B (zh) * 2013-07-04 2015-12-09 富通集团有限公司 一种铜杆生产方法
KR101545603B1 (ko) 2014-11-24 2015-08-20 김장현 성형 온도 보정형 온간 드로우 벤딩 장치
CN105015743A (zh) * 2015-07-13 2015-11-04 苏州金业船用机械厂 一种高强度耐腐蚀性螺旋桨壳体
KR101711858B1 (ko) * 2015-12-24 2017-03-03 주식회사 포스코 도금 장치 및 도금 방법
CN113005394B (zh) * 2021-02-22 2021-12-07 山东农业大学 一种基于稀土催渗碳氮硼共渗的j55钢管加工方法

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CN1924075A (zh) 2007-03-07
CN1924075B (zh) 2010-06-02
KR100667174B1 (ko) 2007-01-12

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