JPS6323015B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a corrosion-resistant composite stranded wire used as a suspension line (messenger wire) such as a trolley wire or cable. [Prior art and problems] Conventionally, galvanized steel stranded wires have been widely used for suspension wires such as trolley wires and cables, but when conductivity is required, twisted copper, copper alloy wires, copper-coated steel wires, etc. line has been used. However, galvanized steel wire has a low conductivity (10
~13% IACS), it cannot be used as a suspension wire for trolley wires when electrical conductivity is required, and it also has the disadvantage of being sensitive to salt water, sulfur dioxide gas, etc., and lacking sufficient corrosion resistance. On the other hand, copper or copper alloy stranded wires have lower tensile strength (20 to 50 Kg/mm ² ) than iron-based wires, and are less susceptible to sulfur dioxide gas, H ₂ S
It is susceptible to corrosive gases such as chlorine ions (Cl ^- ), and has the disadvantage of insufficient corrosion resistance. In order to solve the above-mentioned problems, the present inventors conducted various studies on combinations of wires to be twisted into stranded wires, and as a result, the present invention was accomplished. [Structure of the invention] By using zinc (Zn), aluminum (Al), etc., which are more base than both metals, in copper or copper alloy wire and stainless steel wire, corrosion of copper and stainless steel is prevented and corrosion resistance is improved. It has been found that it is possible to obtain good composite strands. That is, the present invention is made by twisting copper or copper alloy wire and stainless steel wire with zinc or aluminum interposed, and the conductivity of the twisted wire as a whole is 25 to 70%.
IACS is a composite stranded wire for suspension lines characterized by having a tensile strength of 60 to 130 Kg/ ^mm2 . The copper or copper alloy wire used in the present invention is a conductive copper or copper alloy wire, and the stainless steel wire is a chromium-based, nickel-chromium-based, or stainless steel wire with other alloying elements added thereto. In addition to bare wires, these wires also have a base layer of Zn on the surface.
Or it includes a wire plated with Al. Furthermore, if necessary, Zn is added to the outer periphery of the twisted wires.
Plating may be applied, or an appropriate number of Zn or Al wires (including tape) or Zn or Al-plated steel wires may be interposed in the stranded wires. Note that the tape may be used by wrapping it. Zn or Al interposed in the form of these platings or wires (including tape) serves as a sacrificial anode for copper or copper alloy wires or stainless steel wires,
This further improves the corrosion resistance of these wires. Hereinafter, the present invention will be explained by examples using the drawings. The figure is a cross-sectional view showing an embodiment of the present invention. The figure shows the case of 19 concentric twisted wires, where 1 is the center line,
Reference numeral 2 indicates a wire in the first layer, and reference numeral 3 indicates a wire in the second layer. The material combination and arrangement of the wires may be arbitrary. For example, the center wire 1 and all the wires 2 in the first layer are made of galvanized stainless steel wire (diagonal lines), and all the wires 3 in the second layer are made of copper. Line. Furthermore, it is not necessary that all the wires in each layer be of the same type, and different types of wires may be mixed. Furthermore, two or more kinds of copper, copper alloy wires, or plated wires thereof, or stainless steel wires or plated wires thereof may be mixed and used in the same stranded wire. However, it is better to use strands of the same quality for each layer of stranded wire.
This is desirable for efficiently performing twisted wire processing. Further, the number of wires to be twisted may be any number from two to more, and even if the wire diameters are different for each layer, it is sufficient to twist them uniformly. In the present invention, the conductivity of the entire stranded wire is 25 to 70%.
IACS was defined as less than 25% of pure iron.
This is because there is no particular advantage over 17.5% IACS, and the same performance can be obtained with steel wire by making it slightly thicker.If it exceeds 70%, the proportion of copper wire in the cross-sectional area increases, and the tensile strength increases. This is because it becomes less powerful and loses its meaning. In addition, in the present invention, the tensile strength of the entire stranded wire is 60~
The reason for specifying 130Kg/mm ² is that if it is less than 60Kg/mm ² ,
This is because it has no meaning as a high-strength material, and if it exceeds 130 Kg/mm ² , the proportion of the stainless steel wire in the cross-sectional area will increase and the conductivity will decrease. Example: Twisted wires having the configurations shown in Table 2 were created using various strands having the chemical compositions and tensile strengths shown in Table 1.

【table】

[Table] The electrical conductivity and tensile strength of the stranded wire shown in Table 2 as a whole are shown in Table 3.

[Table] From Table 3, Nos. 1 to 3 according to the present invention have a conductivity of approximately
It can be seen that it has an IACS of 40 to about 65% and a tensile strength of about 67 Kg/mm ² or more, and has sufficient performance as a suspension wire for a trolley wire. On the other hand, Comparative Examples 4 to 6 are insufficient in either tensile strength or electrical conductivity. Next, we conducted an atmospheric exposure test on the stranded wire samples shown in Table 2 in a coastal area, and investigated the rusted area ratio of the strands and the maximum pitting depth of the stainless steel wires after 10 months.The results are shown in Table 4. As shown.

[Table] From Table 4, it can be seen that after 10 months of exposure to the atmosphere in a coastal area, the corrosion resistance of both the stainless steel and copper parts of the product according to the present invention was significantly superior to that of the comparative example. In Comparative Example 7, the above-mentioned tensile strength and electrical conductivity are equivalent to the examples of the present invention, but it is recognized that the corrosion resistance is significantly inferior to the examples of the present invention. [Effect] The present invention has the advantage that a stranded wire with conductivity and strength that meets the required performance can be easily obtained by any combination of copper or copper alloy wire with good conductivity and stainless steel wire with high strength. There is.

[Brief explanation of the drawing]

The figure is a cross-sectional view showing an embodiment of the present invention. 1... Center line, 2... Strand wire of first layer, 2... Strand wire of second layer.

Claims (1)

[Claims] 1. Made by twisting zinc or aluminium-plated copper or copper alloy wire and stainless steel wire, or twisting copper or copper alloy wire and zinc or aluminium-plated stainless steel wire, The conductivity of the stranded wire as a whole is 25~
Composite stranded wire for suspension wires, characterized by having performance of 70% IACS and tensile strength of 60 to 130 Kg/ ^mm2 . 2 Copper or copper alloy wire and stainless steel wire are twisted together, and zinc or aluminium-plated steel wire or zinc or aluminum is twisted during the twisting or on the outer periphery, or the outer periphery of the stranded wire is galvanized. A composite stranded wire for suspension wires, characterized in that the stranded wire as a whole has an electrical conductivity of 25 to 70% IACS and a tensile strength of 60 to 130 Kg/ ^mm2 .