JPH0372365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a hot-dip galvanized Fe--Ni alloy wire used in place of a steel core for ACSR. [Conventional technology] Fe-Ni alloy wire with a tensile strength of 90Kg/mm2 ^or more,
When used in place of a galvanized steel core in steel-core aluminum stranded wire (ACSR), the alloy wire has a coefficient of linear expansion after final drawing that is 1/3 to 1/4 that of steel wire, so it can withstand high temperatures. The laxity increases even when used with normal ACSR
It is significantly less than that of 1985, and under sag conditions, it is possible to use it at higher temperatures (see Japanese Patent Publication No. 57-56164). Therefore, even if the ACSR is of the same size, the power transmission capacity can be significantly increased by using Fe-Ni alloy wire, which is a significant advantage. Note that the steel core is made of twisted steel wire. Hot-dip galvanizing is widely used to prevent corrosion of steel wires such as ACSR, and it is a method that has become popular both from an economic standpoint and because of the ease of work. [Problems to be Solved by the Invention] However, the above-mentioned steel wires, especially high-strength special steel wires, have a high twist value, tensile strength, winding,
It is known that mechanical properties such as unwinding properties deteriorate. There are various opinions as to the cause of this deterioration of mechanical properties, but generally it is due to thermal effects from the galvanizing bath and formation between the galvanized layer and the base metal.
It is believed that this is due to the influence of Fe-Zn intermetallic compounds. Tensile strength is 90Kg/ in use condition after final wire drawing
Although it is necessary to galvanize high-strength Fe-Ni alloy wires of mm ² or more, mechanical properties may deteriorate if galvanized using a normal hot-dip galvanizing line. I understand. [Disclosure of the Invention] The present invention was achieved as a result of various studies in view of the above-mentioned circumstances. The purpose of the present invention is to provide a method for producing Fe-Ni alloy wire that does not deteriorate mechanical properties such as strength, twist value, winding, and unwinding, and has a low coefficient of linear expansion. When producing Fe-Ni alloy wire that has a tensile strength of 90 kg/mm ² or more in the used state after final wire drawing, Fe-
Fe-Ni alloy wire mainly composed of 30-50% Ni is sufficiently annealed at a temperature of 500-500℃ for several hours to produce an elongation of 6% or more, and then hot-dip galvanized. , further characterized by subjecting the galvanized Fe-Ni alloy wire to a wire drawing process.
This is a manufacturing method for Ni-based alloy wire, and its tensile strength is
It is manufactured in anticipation of changes in strength due to processing so that it will have a strength of 90 kg/mm ² or more in the used state after the final wire drawing processing. The Fe-Ni alloy wire used in the present invention is Fe-
The main content is 30 to 50% Ni, but if the Ni content is less than 30%, the thermal expansion coefficient will not decrease compared to steel wire, and if it exceeds 50%, it will not decrease compared to steel wire. Co, Cr, Mn, Mg, Mo, C,
There is no problem in including additive elements such as Si, Al, Ti, Nb, etc., but Co, Cr, Mn, Mg, Mo, C,
The content of Si, Al, Ti, Nb, etc. is small. In addition, an elongation of 6% or more means that the test piece of the Fe-Ni alloy wire is subjected to a tensile strength tester, and the elongation when the piece breaks is 6%.
% or more. The annealing method in the present invention may be either batch or continuous, and the elongation after annealing must be 6% or more, and the annealing temperature and time are selected within the above range according to the desired properties. Just do it. If annealing is performed to give an elongation of 6% or more before hot-dip galvanizing, it is often possible to prevent deterioration of mechanical properties, probably because it prevents the thermal effects during hot-dip galvanizing. This was revealed through testing. In the present invention, a normal plating line can be used for hot-dip galvanizing, and pretreatment, flux treatment, etc. may be changed depending on the wire diameter, conditions, etc. Further, for the squeezing, a normal charcoal squeezing method, gas squeezing method, or the like is used. Charcoal drawing is a process in which charcoal powder is suspended and laminated on the surface of a molten zinc bath where a wire is drawn out with zinc attached to it from a zinc bath, and carbon monoxide generated by the heat of the passing steel wire prevents oxidation of the molten zinc. Plating is achieved by squeezing the amount of molten zinc deposited on the wire surface with charcoal powder. Gas squeezing refers to filling the zinc bath with an inert gas flow,
Similarly, while preventing oxidation, zinc plating is achieved while reducing the amount of molten zinc deposited using the gas flow (see Japanese Patent Laid-Open No. 118873/1983). Further, in the present invention, the wire drawing after galvanizing is performed for the purpose of improving strength and lowering the coefficient of linear expansion, and may be performed by either a warm or cold processing method. This area reduction rate is preferably 10% or more,
If it is less than 10%, there is a risk that the drawing force will not be applied uniformly to the entire cross section of the drawn wire during wire drawing, and not only will stable wire drawing be impossible, but the length of the wire after drawing will be reduced. This results in poor quality that does not exhibit uniform characteristics in all directions. [Example] To Fe-39%Ni alloy, C, Si, Cr, Nb, Mo, and Ti are added as elements that increase strength, Mn is added as an element that improves workability, and as a deoxidizer.
After melting an alloy containing a small amount of Al and Mg and casting it into an ingot, it is subjected to blooming rolling and hot rolling.
We manufactured 10mmΦ rough drawn wire. This 9 mmΦ wire rod was subjected to a peeling process and then annealed, and then drawn into a 4.0 mmΦ wire. At 4.0mmΦ
An example of the present invention in which the wires were sufficiently annealed for several hours at a temperature of 500 to 800°C to obtain an elongation of 6% or more as shown in Table 1, and then hot-dip galvanized and then drawn to 3.5 mmΦ. Nos. 1 to 3 were created, and for comparison, a wire with a small elongation due to insufficient annealing was similarly hot-dip galvanized and wire-drawn to 3.5 mmΦ for comparison.
No. 4, hot dip galvanized without annealing,
Comparative Example No. 5.6, in which the wire was drawn to 3.5 mmΦ, and Comparative Example No. 7, in which the wire was hot-dip galvanized after annealing and no wire drawing was performed, were created. The properties before galvanizing and the properties of the final product are shown in Table 1. From Table 1, Examples No. 1 to 3 of the present invention were annealed to produce an elongation of about 6% or more before galvanizing.
is a galvanized Fe material with no deterioration in twisting value, winding, or unwinding properties, high tensile strength, and low coefficient of linear expansion.
It can be seen that -Ni alloy wire was obtained. On the other hand, Comparative Examples No. 4, No. 5, and No. 6 have deteriorated twist values, winding, and unwinding characteristics, and No. 5, No. 6 have deteriorated in twisting value, winding, and unwinding characteristics.
6 shows severe deterioration. In addition, No. 7, which is hot-dip galvanized after annealing but is not wire drawn, has low tensile strength and high coefficient of linear expansion. In this way, No. 7 was not subjected to wire drawing, and the coefficient of linear expansion was smaller than that of the standard steel wire, but it was larger compared to the state of use after the final wire drawing in the present invention. It is easy to understand that when wire processing is applied, the linear expansion coefficient becomes the same as that of Nos. 1 to 3, and the linear expansion coefficient and tensile expansion coefficient of the Fe-Ni alloy wire mentioned above are This will improve strength. [Effects of the Invention] As described above, the method of the present invention enables Fe to maintain a tensile strength of 90 Kg/mm ² or more in the final use state.
- When manufacturing Ni-based alloy wire, we apply annealing to produce an elongation of 6% or more, then hot-dip galvanizing, and then wire drawing. It has the advantage of being able to produce Fe-Ni alloy wires that have excellent mechanical properties such as strength, winding, and unwinding, and have a low coefficient of linear expansion. 【table】

Claims (1)

[Claims] 1. When producing Fe-Ni alloy wire that has a tensile strength of 90 Kg/mm ² or more in the used state after final wire drawing, Fe-30 to 50% Ni is the main component. Annealing Fe-Ni alloy wire to elongate it by more than 6%
After annealing at a temperature of 500 to 800°C for several hours, hot-dip galvanizing is performed, and then the galvanizing process is performed.
A method for manufacturing a galvanized Fe-Ni alloy wire, which comprises subjecting the Fe-Ni alloy wire to wire drawing. 2. The method for manufacturing a galvanized Fe-Ni alloy wire according to claim 1, wherein the wire drawing is performed with an area reduction rate of 10% or more.