JP2017179513A - Molten aluminum plating steel wire, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten aluminum plating steel wire with excellent corrosion resistance and a method of manufacturing the wire.SOLUTION: A molten aluminum plating steel wire 3 having molten aluminum plating coating on the surface of a steel wire 2, in which the molten aluminum plating coating has 13 mass% or less of the content of silicon, 0.3 mass% or less of the content of nickel, and the balance of the silicon and the nickel is aluminum and molten aluminum plating coating being inevitable impurity. A method of manufacturing a molten aluminum plating steel wire in which when manufacturing the molten aluminum plating steel wire 3 by continuously pulling up the steel wire 3 from a molten aluminum plating bath 1 after the steel wire 2 is immersed into the molten aluminum plating bath 1, it is preferable that the bath 1 temperature is from a plating melting point to 700°C, and immersion time is 5.8 seconds or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot-dip aluminized steel wire and a method for producing the same. More specifically, the present invention relates to a hot dip galvanized steel wire that can be suitably used for, for example, an automobile wire harness and a method for manufacturing the same.

  As a method of performing hot-dip aluminum plating on a stainless steel plate, for example, after pre-plating a ferritic stainless steel plate containing 16 to 35% by weight of Cr and leaving it to stand for 24 hours or more, the dew point is 50% by volume or less in hydrogen gas concentration. There has been proposed a molten aluminum plating method for high Cr ferritic stainless steel sheet, characterized by heating in a hydrogen-nitrogen atmosphere at −30 ° C. or lower and subsequently introducing into a molten aluminum bath or molten aluminum alloy bath (for example, , Refer to claim 1 of Patent Document 1). According to the hot aluminum plating method of the high Cr ferritic stainless steel sheet, an excellent hot aluminum plated high Cr ferritic stainless steel sheet having excellent workability can be produced without causing defects such as non-plating. An effect is produced.

  However, in the hot-dip aluminum-plated steel wire, unlike the stainless steel plate subjected to hot-dip aluminum plating, the steel wire is not subjected to Fe-B pre-plating when the hot-dip aluminum-plated steel wire is manufactured. From the viewpoint of productivity of hot-dip aluminum-plated steel wire, direct hot-dip aluminum plating is desired.

JP-A-5-195182

  When the hot-dip aluminum plating is performed directly on the steel wire, in order to improve the adhesion of the plating layer on the steel wire, when the temperature of the hot-dip aluminum plating bath is increased, or when the immersion time of the steel wire is increased. When a steel wire containing nickel, such as a stainless steel wire, is used as the steel wire, the nickel contained in the steel wire is eluted into the molten aluminum plating bath, and the eluted nickel is dissolved in the steel wire. When included in the hot-dip aluminum plating film formed on the surface, the corrosion resistance of the hot-dip aluminum-plated steel wire may be reduced.

  This invention is made | formed in view of the said prior art, and makes it a subject to provide the hot dip galvanized steel wire excellent in corrosion resistance, and its manufacturing method.

The present invention
(1) A hot-dip aluminum plated steel wire having a hot-dip aluminum plating film on the surface of the steel wire, wherein the hot-dip aluminum plating film has a silicon content of 13% by mass or less and a nickel content of 0.00. 3% by mass or less, and a molten aluminum-plated steel wire, wherein the balance of silicon and nickel is aluminum and unavoidable impurities, and (2) the molten aluminum according to (1) A method for producing a plated steel wire, wherein the silicon content is 13% by mass or less, the nickel content is 0.3% by mass or less, and the remainder of the silicon and nickel is aluminum and inevitable impurities. After dipping the steel wire in the molten aluminum plating bath, the steel wire is continuously drawn from the molten aluminum plating bath. When the hot-dip aluminum plating steel wire is manufactured by pulling up, the bath temperature of the hot-dip aluminum plating bath is adjusted to the melting point of the hot-dip plating bath to 700 ° C., and the immersion time of the steel wire in the hot-dip aluminum plating bath is 5.8. It is related with the manufacturing method of the hot dip aluminized steel wire characterized by adjusting to below second.

  ADVANTAGE OF THE INVENTION According to this invention, the hot-dip aluminized steel wire excellent in corrosion resistance and its manufacturing method are provided.

It is a schematic explanatory drawing which shows one embodiment of the manufacturing apparatus of the hot dip galvanized steel wire of this invention. It is a schematic sectional drawing which shows one embodiment of the steel wire introduction part control apparatus shown by FIG. It is a schematic sectional drawing which shows one embodiment of the bath surface control apparatus used for the steel wire introduction part control apparatus shown by FIG. 1 and FIG. In the manufacturing method of the molten aluminum plating steel wire of this invention, it is a schematic sectional drawing which shows one embodiment of the boundary part of the steel wire at the time of pulling up a steel wire from a molten aluminum plating bath, and the bath surface of a molten aluminum plating bath.

  As described above, the molten aluminum plated steel wire of the present invention is a molten aluminum plated steel wire having a molten aluminum plated coating on the surface of the steel wire, and the molten aluminum plated coating has a silicon content of 13% by mass. The nickel content is 0.3% by mass or less, and the remainder of the silicon and nickel is aluminum and a molten aluminum plating film which is an inevitable impurity.

  Examples of the steel material constituting the steel wire used in the present invention include stainless steel, but the present invention is not limited to such illustration.

  Stainless steel is an alloy steel containing nickel and chromium (Cr). Examples of the stainless steel include austenitic steel materials, ferritic steel materials, martensitic steel materials and the like specified in JIS G4309, but the present invention is not limited only to such examples. Specific examples of the stainless steel include stainless steels such as SUS301 and SUS304, which are generally considered to be metastable; austenitic stainless steels such as SUS305, SUS310, and SUS316; SUS403, SUS410, SUS416, SUS420, SUS431, and the like. Examples include martensitic stainless steel such as SUS440, and chromium-nickel-manganese stainless steel classified in the SUS200 series, but the present invention is not limited to such examples.

  The wire diameter of the steel wire is not particularly limited and is preferably adjusted as appropriate according to the use of the hot-dip aluminum-plated steel wire. For example, when using a hot-dip aluminized steel wire for an application such as an automobile wire harness, the wire diameter of the steel wire is usually preferably about 0.05 to 0.5 mm.

  The steel wire may be degreased before being subjected to hot-dip aluminum plating. The steel wire is degreased, for example, by immersing the steel wire in an alkaline degreasing solution, washing with water, neutralizing moisture adhering to the steel wire, and washing again with water. It can be performed by a method in which electrolytic degreasing is performed by energizing a steel wire in a state immersed in a liquid. From the viewpoint of improving the degreasing power, the alkaline degreasing solution may contain a surfactant.

  A film made of aluminum or an aluminum alloy (hereinafter referred to as a hot-dip aluminum plating film) is formed on the surface of the hot-dip aluminum-plated steel wire. Since the hot-dip aluminum plating steel wire of the present invention has a hot-dip aluminum plating film formed on the surface thereof, it has excellent adhesion to aluminum wires, and is excellent in tensile strength and electrical resistance over time. .

  Further, the hot-dip aluminum plating film of the hot-dip aluminum-plated steel wire of the present invention has a silicon content of 13% by mass or less, a nickel content of 0.3% by mass or less, and the remainder of the silicon and nickel Since it is a molten aluminum plating film which is an aluminum and inevitable impurity, it is excellent in corrosion resistance.

  The silicon content in the hot-dip aluminum plating film of the hot-dip aluminum plating steel wire is 13% by mass or less from the viewpoint of reducing the electrical resistance of the hot-dip aluminum plating steel wire of the present invention and improving the wire drawing workability. The lower limit of the silicon content is 0% by mass.

  From the viewpoint of improving the corrosion resistance of the hot-dip aluminum-plated steel wire of the present invention, the nickel content in the hot-dip aluminum-plated steel wire of the hot-dip aluminum-plated steel wire is 0.3% by mass or less, and its lower limit is 0% by mass. is there.

  The balance of silicon and nickel in the hot-dip aluminum plating film of hot-dip aluminum plating steel wire is aluminum and inevitable impurities.

  Inevitable impurities are usually impurities inevitably mixed in the hot-dip aluminum plating process. Examples of unavoidable impurities include iron (Fe), chromium (Cr), zinc (Zn), copper (Cu), and the like, but the present invention is not limited to such examples. The content of inevitable impurities varies depending on the type of the inevitable impurities, and thus cannot be determined unconditionally, and may be within a range in which the object of the present invention is not hindered. What is necessary is just mass% or less.

  When the hot-dip aluminum-plated steel wire of the present invention is manufactured by, for example, immersing the steel wire in a hot-dip aluminum plating bath and then continuously pulling the steel wire from the hot-dip aluminum plating bath, The temperature of the molten aluminum plating bath can be adjusted to the melting point of the plating bath to 700 ° C., and the immersion time of the steel wire in the molten aluminum plating bath can be adjusted to 5.8 seconds or less.

  Although the manufacturing method of the hot dip aluminum plating of this invention is demonstrated based on drawing below, this invention is not limited only to the embodiment as described in the said drawing.

  FIG. 1 is a schematic explanatory view showing one embodiment of a method for producing a hot-dip aluminized steel wire of the present invention.

  In the manufacturing method of the hot dip aluminum plating steel wire of the present invention, after the steel wire 2 is immersed in the hot dip aluminum plating bath 1, the steel wire 2 is continuously pulled up from the hot dip aluminum plating bath 1 to thereby obtain hot dip aluminum plating steel. Line 3 is manufactured.

  From the viewpoint of obtaining a hot-dip aluminum-plated steel wire 3 having excellent corrosion resistance, the steel wire 2 is preferably subjected to alkaline degreasing and pickling treatment before the steel wire 2 is immersed in the hot-dip aluminum plating bath 1. . Conventional methods can be used for the alkali degreasing and pickling treatment methods.

  In FIG. 1, a steel wire 2 is sent out from a feeding device 4 for the steel wire 2, continuously conveyed in the direction of arrow A, and immersed in a molten aluminum plating bath 1 in a plating bath 5.

  In the molten aluminum plating bath 1, only aluminum may be used, and if necessary, other elements may be contained within a range not impairing the object of the present invention.

  Examples of the other elements include chromium, zinc, silicon, copper, and iron, but the present invention is not limited to such examples. When these other elements are contained in aluminum, the mechanical strength of the coating can be increased, and as a result, the tensile strength of the hot dip galvanized steel wire 3 can be increased. Among the other elements, although it depends on the type of steel wire, it suppresses the formation of an iron-aluminum alloy layer having brittleness between iron contained in the steel wire and aluminum contained in the coating. From the viewpoint of efficiently plating the steel wire 2 by increasing the mechanical strength of the plating film and lowering the melting point of the molten aluminum plating bath 1, silicon is preferable.

  The silicon content in the molten aluminum plating bath 1 is 13% by mass or less from the viewpoint of reducing the electrical resistance of the molten aluminum plated steel wire 3 and improving the wire drawing workability.

  From the viewpoint of improving the corrosion resistance of the molten aluminum-plated steel wire 3, the nickel content in the molten aluminum plating bath 1 is 0.3% by mass or less.

  The bath temperature of molten aluminum plating bath 1 is adjusted to the melting point of plating bath 1 to 700 ° C. In the present invention, since the bath temperature of the molten aluminum plating bath 1 is adjusted to the above temperature range, the molten aluminum plated steel wire 3 having excellent corrosion resistance can be obtained. The bath temperature of the molten aluminum plating bath 1 is a temperature equal to or higher than the melting point of the plating bath 1 at atmospheric pressure, preferably 665 ° C. or higher, from the viewpoint of efficiently forming a smooth aluminum plating film (not shown). Is 670 ° C. or higher, and 700 ° C. or lower from the viewpoint of obtaining a hot-dip aluminized steel wire 3 having excellent corrosion resistance.

  In the present invention, another major feature is that the time (immersion time) in which the steel wire 2 is immersed in the molten aluminum plating bath 1 is adjusted to 5.8 seconds or less. The immersion time for immersing the steel wire 2 in the molten aluminum plating bath 1 is preferably 0.1 seconds or more, more preferably 0.2 seconds, from the viewpoint of efficiently producing the molten aluminum plated wire 3 having a smooth plating film. As mentioned above, More preferably, it is 0.3 second or more, and it is 5.8 second or less from a viewpoint of improving the corrosion resistance of the hot-dip aluminized steel wire 3.

  Before the steel wire 2 is immersed in the molten aluminum plating bath 1, the steel wire 2 is passed through the steel wire introduction unit controller 8 in advance in order to prevent an oxide film from adhering to the surface of the steel wire 2. It is preferable.

  Examples of the steel wire introduction unit control device 8 include the steel wire introduction unit control device 8 shown in FIG. 2, but the present invention is not limited to such examples. FIG. 2 is a schematic cross-sectional view showing an embodiment of the steel wire introduction part control device 8. The steel wire introduction unit control device 8 includes a heating device 6 and a bath surface control device 7.

  The heating device 6 includes, for example, a tubular heating device body 6a such as stainless steel. The inside 6b of the heating device body 6a is hollow. The steel wire 2 is passed through the inside 6b of the heating device body 6a in the direction of arrow B. A heating gas vent 6c is disposed on the side surface of the heating device body 6a.

  Examples of the heating gas include air, and inert gases such as nitrogen gas, argon gas, and helium gas, but the present invention is not limited to such examples. The temperature of the heating gas cannot be determined unconditionally because it varies depending on the type of the steel wire 2 and its wire diameter, the wire speed, the flow rate of the heating gas, and the like.

  The heating temperature of the steel wire 2 is preferably 60 ° C. or higher, more preferably 80 ° C. or higher, more preferably 150 ° C. or higher, even more preferably 200 ° C. or higher, from the viewpoint of efficiently producing the hot-dip aluminized steel wire 3. In consideration of energy efficiency, it is preferably 1000 ° C. or lower, more preferably 900 ° C. or lower, and further preferably 800 ° C. or lower.

  The length of the heating device body 6a is not particularly limited as long as the steel wire 2 can be adjusted so that the steel wire 2 is heated to a predetermined temperature. For example, the length is about 1 to 5 m. It is. The inner diameter of the heating device main body 6a varies depending on the wire diameter and type of the steel wire 2 to be used, and thus cannot be determined unconditionally, but is usually about 1.5 to 50 times the wire diameter of the steel wire 2. is there. For example, when the steel wire 2 having a wire diameter of 0.2 mm is used, the inner diameter of the heating device body 6a is preferably about 0.3 to 10 mm.

  A branch pipe 6e is disposed on the side surface of the heating apparatus body 6a. The steel wire 2 passed through the heating device 6 can be heated by ventilating the heating gas from the branch pipe 6e, and a heater (not shown) is provided in the branch pipe 6e. The heated gas vented into the branch pipe 6e may be heated by the above. In the embodiment shown in FIG. 2, seven branch pipes 6e are provided, but the number of branch pipes 6e is not particularly limited, and the number may be only one, or 2 to About ten may be sufficient.

  A gap D is provided between the heating device 6 and the bath surface control device 7 disposed below the heating device 6. The gap D is preferably about 3 to 10 mm. The gap D is not necessarily provided, and the heating device 6 and the bath surface control device 7 may be integrated.

  In addition, as the heating apparatus 6, instead of the heating apparatus 6 shown in FIG. 2, for example, an electric heating apparatus, an induction heating apparatus, or the like can be used.

  Examples of the bath surface control device include the bath surface control device 7 shown in FIG. 3, but the present invention is not limited to such examples. FIG. 3 is a schematic cross-sectional view showing an embodiment of the bath surface control device 7.

  The bath surface control device 7 includes a tubular body 9 having a through hole 9a for allowing the steel wire 2 to penetrate therethrough. The tubular body 9 has an inlet 9b for introducing the steel wire 2 at one end thereof, and has an outlet 9c for discharging the steel wire 2 at the other end. The tubular body 9 further has a dipping region 9 d for dipping in the molten aluminum plating bath 1 from the end of the discharge port 9 c along the longitudinal direction of the tubular body 9. The length of the immersion region 9d is usually preferably 2 to 20 mm, more preferably 5 to 15 mm or more.

  The total length of the bath surface control device 7 is usually preferably 30 to 500 mm, more preferably 40 to 300 mm, and still more preferably 50 to 100 mm.

  Ratio of the area of the opening in the inlet 9b of the tubular body 9 to the area in the cross section of the steel wire 2 used for hot-dip aluminum plating (so-called cross section of the steel wire 2) [of the opening of the through hole of the tubular body The area / area of the cross section of the steel wire] is preferably 3 or more from the viewpoint of smoothly introducing the steel wire 2 into the through hole 9a of the tubular body 9, and an oxide film adheres to the steel wire 2. From the viewpoint of preventing this, it is preferably 4000 or less, more preferably 3000 or less, still more preferably 2000 or less, and even more preferably 1000 or less.

  The shape of the opening in the inlet 9b of the tubular body 9 is arbitrary and may be circular or other shapes. The gap (clearance) between the opening at the inlet 9b of the tubular body 9 and the steel wire 2 is preferably 10 μm or more, more preferably 20 μm or more from the viewpoint of preventing sliding between the inner wall of the tubular body 9 and the steel wire 2. More preferably, it is 50 micrometers or more, More preferably, it is 100 micrometers or more.

  If necessary, the steel wire 2 that has passed through the steel wire introduction part control device 8 is immersed in the molten aluminum plating bath 1.

  The wire speed of the steel wire 2 is 100 m / min or more from the viewpoint of efficiently producing the hot-dip aluminum-plated steel wire 3, and the hot-dip aluminum-plated steel wire in which the oxide film is hardly scattered and the oxide film is difficult to adhere to the surface. From the viewpoint of efficiently producing 3, it is preferably 1000 m / min or less, more preferably 800 m / min or less.

  The time of immersion in the molten aluminum plating bath 1 (plating time) is adjusted so that the thickness of the plating film formed on the surface of the steel wire 2 becomes a predetermined thickness. The time of immersion in the molten aluminum plating bath 1 (plating time) varies depending on the required thickness of the plating film, the bath temperature of the molten aluminum plating bath 1 and the like, but cannot be generally determined. ~ About 3 seconds.

  Next, the molten aluminum plating steel wire 3 in which the molten aluminum plating bath 1 is adhered to the surface of the steel wire 2 by pulling up the steel wire 2 immersed in the molten aluminum plating bath 1 from the bath surface 10 of the molten aluminum plating bath 1. Is obtained.

  When the steel wire 2 is pulled up from the molten aluminum plating bath 1, as shown in FIGS. 1 and 4, the molten aluminum plated steel wire 3 pulled up from the molten aluminum plating bath 1 and the bath surface 10 of the molten aluminum plating bath 1. The stabilizing member 11 is brought into contact with the bath surface 10 of the molten aluminum plating bath 1 and the molten aluminum plated steel wire 3 at the boundary with the molten aluminum plating steel wire 3 and faces the stabilizing member 11 through the molten aluminum plated steel wire 3. A nozzle 12 for spraying an inert gas on the position is arranged. FIG. 4 shows a boundary portion between the steel wire 2 and the bath surface 10 of the molten aluminum plating bath 1 when the steel wire 2 is pulled up from the molten aluminum plating bath 1 in the method for producing a molten aluminum plated steel wire of the present invention. It is a schematic sectional drawing.

  Examples of the stabilizing member 11 include a stainless steel square bar having a heat-resistant cloth material 11a wound around the surface thereof. The heat resistant cloth member 11a wound around the stabilizing member 11 is formed from a new surface (new surface) of the stabilizing member 11 with molten aluminum from the viewpoint of suppressing adhesion of aluminum lump to the surface of the molten aluminum plated steel wire 3. It is preferable to contact the plated steel wire 3. The new surface (new surface) of the stabilizing member 11 is, for example, a stabilizing member 11 on which a heat-resistant cloth material 11a is wound in advance, while the stabilizing member 11 is brought into contact with the hot dip galvanized steel wire 3 and molten aluminum. When the plated steel wire 3 is pulled up, it can be formed by winding up the heat-resistant cloth material 11a sequentially.

  The stabilizing member 11 is preferably brought into contact with both the bath surface 10 of the molten aluminum plating bath 1 and the molten aluminum plated steel wire 3 simultaneously. Thus, when the stabilizing member 11 is simultaneously brought into contact with both the bath surface 10 of the molten aluminum plating bath 1 and the molten aluminum plated steel wire 3, the pulsation of the bath surface 10 of the molten aluminum plating bath 1 is suppressed. When the molten aluminum plated steel wire 3 is pulled up in contact with the stabilizing member 11, the molten aluminum plated steel wire 3 is restrained from microvibration, and as a result, the molten aluminum plating bath 1 is formed on the surface of the steel wire 2. A film can be formed uniformly. When the stabilizing member 11 is brought into contact with the hot dip galvanized steel wire 3, tension is applied to the hot dip galvanized steel wire 3 as necessary from the viewpoint of suppressing minute vibration of the galvanized steel wire 3. In order to do so, the stabilizing member 11 may be lightly pressed against the hot-dip aluminized steel wire 3.

  A nozzle 12 for spraying an inert gas is disposed at a position facing the stabilizing member 11 via the hot-dip aluminum-plated steel wire 3, and the tip 12 a of the nozzle 12 is formed of the hot-dip aluminum-plated steel wire 3 and hot-melt aluminum. It is preferable to dispose the plating bath 1 so that an inert gas can be sprayed on the boundary with the bath surface 10. The distance (shortest distance) from the molten aluminum plated steel wire 3 to the tip 12a of the nozzle 12 is preferably from the viewpoint of avoiding contact with the molten aluminum plated steel wire 3 and efficiently producing the molten aluminum plated steel wire 3. From the viewpoint of obtaining a molten aluminum-plated steel wire 3 that is 1 mm or more, has a uniform wire diameter, and hardly adheres to an aluminum lump on the surface, it is preferably 50 mm or less, more preferably 40 mm or less, even more preferably 30 mm or less, Preferably it is 10 mm or less, More preferably, it is 5 mm or less.

  The inner diameter of the tip 12a of the nozzle 12 is melted by accurately blowing the inert gas discharged from the tip 12a of the nozzle 12 to the boundary portion between the molten aluminum plating steel wire 3 and the bath surface 10 of the molten aluminum plating bath 1. From the viewpoint of efficiently producing the aluminum-plated steel wire 3, the viewpoint of obtaining a molten aluminum-plated steel wire 3 that is preferably 1 mm or more, more preferably 2 mm or more, has a uniform wire diameter, and hardly has an aluminum lump attached to the surface. Therefore, it is preferably 15 mm or less, more preferably 10 mm or less, and further preferably 5 mm or less.

  For example, the inert gas can be supplied from the inert gas supply device 13 to the nozzle 12 via the pipe 14. In order to adjust the flow rate of the inert gas in the inert gas supply device 13 or the pipe 14, for example, a flow rate control device (not shown) such as a valve may be provided.

  An inert gas means a gas that is inert to the molten aluminum. Examples of the inert gas include nitrogen gas, argon gas, helium gas, and the like, but the present invention is not limited to such examples. Of the inert gases, nitrogen gas is preferred. The inert gas may contain, for example, oxygen gas, carbon dioxide gas and the like within a range not impairing the object of the present invention.

  The volume flow rate of the inert gas discharged from the tip 12a of the nozzle 12 is preferably 2 L (liter) / liter from the viewpoint of obtaining a molten aluminum-plated steel wire 3 having a uniform wire diameter and almost no aluminum lump adhering to the surface. min or more, more preferably 5 L / min or more, further preferably 10 L / min or more, from the viewpoint of suppressing the adhesion of aluminum lump to the surface of the molten aluminum plated steel wire 3 due to scattering of the molten aluminum plating bath 1, Preferably it is 200 L / min or less, More preferably, it is 150 L / min or less, More preferably, it is 100 L / min or less.

  The temperature of the inert gas discharged from the tip 12a of the nozzle 12 is preferably 200 ° C. or more, more preferably from the viewpoint of obtaining a molten aluminum-plated steel wire 3 having a uniform wire diameter and almost no aluminum lump adhering to the surface. Is not less than 300 ° C., more preferably not less than 400 ° C., and if it is too high, the thermal efficiency is lowered, so that it is preferably 800 ° C. or less, more preferably 780 ° C. or less, and even more preferably 750 ° C. or less.

  The temperature of the inert gas discharged from the tip 12a of the nozzle 12 is, for example, a sheath thermoelectric having a diameter of 1.6 mm in the inert gas at the tip 12a portion of the nozzle 12 discharged from the tip 12a of the nozzle 12. It is a value when measured by inserting a thermocouple for temperature measurement such as a pair.

  The pulling speed at the time of pulling up the molten aluminum plated steel wire 3 from the bath surface 10 of the molten aluminum plating bath 1 is not particularly limited, and is present on the surface of the molten aluminum plated steel wire 3 by appropriately adjusting the pulling speed. Since it is possible to adjust the average thickness of the molten aluminum plating film, it is preferable to appropriately adjust according to the average thickness of the molten aluminum plating film.

  In order to cool the hot-dip aluminum-plated steel wire 3 in the process of being pulled up and efficiently solidify the aluminum-plated film formed on the surface, as shown in FIG. May be. In the cooling device 15, the molten aluminum plated steel wire 3 can be cooled by spraying, for example, gas, liquid mist or the like onto the molten aluminum plated steel wire 3.

  The hot dip galvanized steel wire 3 manufactured as described above can be collected by, for example, the winding device 16.

  The average thickness of the hot-dip aluminum plating film existing on the surface of the hot-dip aluminum plating steel wire 3 suppresses the exposure of the base steel wire 2 during stranded wire processing, caulking processing, etc., and the unit wire diameter From the viewpoint of increasing the mechanical strength, it is preferably about 5 to 10 μm.

  The steel wire 2 may be pre-plated on the surface of the steel wire 2 before the steel wire 2 is immersed in the molten aluminum plating bath 1 from the viewpoint of efficiently forming a smooth aluminum plating film. . Examples of the metal constituting the pre-plating treatment include zinc, nickel, chromium, and alloys thereof, but the present invention is not limited to such examples.

  The hot-dip aluminized steel wire 3 obtained above may be subjected to wire drawing using a die or the like, if necessary, so as to have a desired wire diameter.

  Since the hot-dip aluminized steel wire 3 of the present invention is excellent in corrosion resistance, it can be suitably used for, for example, an automobile wire harness.

  EXAMPLES Next, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to this Example.

Examples 1 to 25 and Comparative Examples 1 to 7
In Examples 1 to 25 and Comparative Examples 1 to 7, hot dip galvanized steel wires were manufactured based on the embodiment of the method for manufacturing galvanized steel wires shown in FIG.

  Steel wires having the wire diameters shown in Tables 1 and 2 and made of the steel types shown in Tables 1 and 2, and the surface of the steel wires not subjected to galvanizing treatment (in Tables 1 and 2) Those having a galvanized film with an average thickness of 5 μm or less (represented as “present” in the “pre-Zn” column of Tables 1 and 2) were used.

  The steel wire not subjected to galvanization was degreased by dipping in a sodium orthosilicate degreasing solution to which a surfactant was added before dipping in the molten aluminum plating bath.

  Further, before the steel wire was immersed in the molten aluminum plating bath, the steel wire was passed through a steel wire introduction part control device shown in FIG. 2, and the steel wire was preheated to about 400 ° C. with a heating device. The preheating temperature was measured by preparing a steel wire connected to a thermocouple and passing the steel wire through a pre-tropical zone maintained at a predetermined temperature together with the thermocouple.

  Moreover, the ratio of the area of the opening part in the inlet of a tubular body and the area in the cross section of a steel wire [the through-hole which a tubular body has] is used using the bath surface control apparatus of the steel wire introduction part control apparatus shown in FIG. The area of the opening / the area in the cross section of the steel wire] was set to 57, and the steel wire was immersed in a molten aluminum plating bath via the bath surface control device.

  As a molten aluminum plating bath, a molten aluminum plating bath containing nickel having a content shown in Tables 1 and 2 (aluminum purity: 99.7% or more, “type of molten aluminum plating” in Tables 1 and 2 is “ “Aluminum”, a molten aluminum plating bath containing 4% by mass of silicon: “4% Si” in the column of “type of molten Al plating” in Tables 1 and 2, and a molten containing 8% by mass of silicon Aluminum plating bath: “8% Si” in the column of “type of molten Al plating” in Tables 1 and 2; molten aluminum plating bath containing 10% by mass of silicon: “of molten Al plating” in Tables 1 and 2 A hot-dip aluminum plating bath which contains “10% Si” in the “Type” column or contains 13% by mass of silicon: “13” in the “Type of hot-dip Al plating” column in Tables 1 and 2 The wire speeds shown in Tables 1 and 2 were used after dipping the steel wire in the molten aluminum plating bath at the bath temperatures shown in Tables 1 and 2 at the bath temperatures shown in Tables 1 and 2 for the immersion times shown in Tables 1 and 2. The steel wire was pulled up from the hot-dip aluminum plating bath at (steel wire pulling speed).

  “%” In the column of “Ni content (%)” in Tables 1 and 2 means “mass%”.

  At that time, a stabilizing member having a width of 40 mm (with a heat resistant cloth on the surface) at the boundary between the molten aluminum plating steel wire pulled up from the molten aluminum plating bath and the bath surface of the molten aluminum plating bath. A stainless steel square bar wound with a material was brought into contact.

  In addition, nozzles having the inner diameter of the tip shown in Tables 1 and 2 are arranged so that the tip of the nozzle is located at a location 2 mm away from the hot-dip aluminized steel wire. An inert gas (nitrogen gas) having the indicated temperature was sprayed on the boundary between the molten aluminum plated steel wire and the bath surface of the molten aluminum plating bath at the volume flow rate shown in Tables 1 and 2 and the gas pressure shown in Tables 1 and 2. .

  By performing the above operation, a hot dip galvanized steel wire having a plating film with an average thickness of 3 to 15 μm was obtained.

  In addition, the average thickness of the plating film was determined by measuring the optical outer diameter measuring instrument [(Co., Ltd.) installed at two arbitrary locations while letting a hot-dip aluminum-plated steel wire having a length of 100 m pass through at a speed of 100 m / min. ) Made by Keyence, product number: LS-7000], the wire diameter of the hot-dip aluminum-plated steel wire was measured at intervals of about 1.4 mm, and the average value of the measured hot-dip aluminum-plated steel wire was obtained. The value was obtained by subtracting the wire diameter of the steel wire before forming the aluminum coating from the value and dividing the obtained value by 2.

  Next, after continuously manufacturing the hot-dip aluminum-plated steel wire by running the steel wire at a wire speed shown in Tables 1 and 2 for 60 seconds, adhesion of hot-dip aluminum plating film on the hot-dip aluminum-plated steel wire The amount and nickel content in the hot-dip aluminum plating film were examined based on the following method. The results are listed in Tables 1 and 2.

[Amount of molten aluminum plating coating]
A 1-m test piece was cut out from the hot-dip aluminum-plated steel wire, and the mass (before the test) of the test piece was measured.

The test piece is dipped in a 10% aqueous hydrochloric acid solution at room temperature to completely dissolve the molten aluminum plating film, and then taken out from the aqueous solution. The moisture is sufficiently wiped off, and the mass of the test piece (after the test) is the same as described above. Measure with the formula:
[Amount of molten aluminum plating film (g / m)]
= [Mass before test (g / m)]-[Mass after test (g / m)]
Based on the above, the adhesion amount of the molten aluminum plating film per 1 m of the steel wire was determined.

[Nickel content in molten aluminum plating film]
The aqueous solution after the test was measured for the nickel content in the molten aluminum plating film with an ICP emission analyzer [Shimadzu Corporation, product number: ICPS-8100].

  Next, the results of examining the corrosion resistance of the test pieces obtained above based on the following method are shown in Tables 1 and 2.

[Corrosion resistance]
A test piece was prepared by cutting a 130 mm test piece from a hot-dip aluminized steel wire.

Next, in accordance with JASO M609-91 (JIS H 8502), 0.1% saline solution (pH 4) at 35 ° C. was sprayed for 1 hour, and then dried in air at a temperature of 50 ° C. for 4 hours. After performing 12 cycles of the corrosion resistance test with one cycle of a series of operations in a humid atmosphere having a relative humidity of 98% and a humidity of 98% at a temperature of 0 ° C., the length of white rust generated in the test piece Measure the formula:
[White rust occurrence rate (%)] = {[White rust occurrence length (m)] / [Observation length (m)]} × 100
The white rust occurrence rate was determined based on the above, and the corrosion resistance was evaluated based on the following evaluation criteria.

(Evaluation criteria)
◎: White rust occurrence rate is 20% or less ○: White rust occurrence rate exceeds 20%, 50% or less ×: White rust occurrence rate exceeds 50%

  From the results shown in Tables 1 and 2, it can be seen that according to each example, a hot-dip galvanized steel wire excellent in corrosion resistance can be efficiently produced as compared with each comparative example.

  The hot-dip aluminized steel wire of the present invention can be suitably used for, for example, an automobile wire harness.

DESCRIPTION OF SYMBOLS 1 Hot dip aluminum plating bath 2 Steel wire 3 Hot dip aluminum plating steel wire 4 Delivery device 5 Plating bath 6 Heating device 7 Bath surface control device 8 Steel wire introduction part control device 9 Tubular body 10 Bath surface of molten aluminum plating bath 11 Stabilizing member 11a Heat-resistant cloth material 12 Nozzle 12a Nozzle tip 13 Inert gas supply device 14 Piping 15 Cooling device 16 Winding device

Claims (2)

  A hot-dip aluminum-plated steel wire having a hot-dip aluminum plating film on the surface of the steel wire, wherein the hot-dip aluminum plating film has a silicon content of 13% by mass or less and a nickel content of 0.3% by mass. A hot-dip aluminum-plated steel wire, which is a hot-dip aluminum plating film in which the balance of silicon and nickel is aluminum and inevitable impurities.   It is a method of manufacturing the hot dip galvanized steel wire according to claim 1, wherein the silicon content is 13% by mass or less, the nickel content is 0.3% by mass or less, and the silicon and nickel When the molten aluminum plating steel wire is manufactured by continuously pulling up the steel wire from the molten aluminum plating bath after the steel wire is immersed in the molten aluminum plating bath with the balance being aluminum and inevitable impurities, the molten aluminum is used. A method for producing a hot-dip aluminum-plated steel wire, wherein the bath temperature of the plating bath is adjusted to the melting point of the plating bath to 700 ° C., and the immersion time of the steel wire in the hot-dip aluminum plating bath is adjusted to 5.8 seconds or less. .

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