JPS59137112A - Manufacture of galvanized fe-ni alloy wire rod - Google Patents

Abstract

PURPOSE:To improve the value of the allowable number of twists and strength, etc. of a wire rod and to obtain the Fe-Ni alloy wire rod having low linear coefficient of expansion by annealing the wire rod before galvanizing it and drawing it again after the galvanizing. CONSTITUTION:An Fe-Ni alloy wire rod having 90kg/mm.<2> strength at a final using condition (after drawing) expected after the change of its strength caused by processing, is annealed to set it to <=6% elongation after annealing. And the previously annealed alloy wire rod is galvanized. Then the galvanized wire rod is drawn again at a >=10% reduction rate of area. Thus the mechanical characteristics in the value of the allowable number of twists, strength, coiling, and uncoiling are improved, and the Fe-Ni alloy wire rod having low linear coefficient of expansion is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a hot-dip galvanized Fe--Ni alloy wire, and particularly to a method for increasing the twist value thereof.

Fe-Ni alloy wire with tensile strength of 90Kg/- or more,
When used instead of galvanized core alignment of JI4I aluminum stranded wire (AC5R), the linear expansion coefficient is as small as % of steel, so even if AC5R'i is used once at high temperature, the sag will usually increase. It is significantly less than AC5R, and can be used at higher temperatures under the same sag conditions. Therefore, A of the same size
Even in C5R, the use of Fe-Ni-based priming wire allows for a drastic increase in the amount of wire to be fed, which has a significant advantage.

Hot-dip galvanizing is widely used for corrosion protection of AC5R and other steel wires, and is a popular method from both an economic standpoint and ease of operation.

However, it is known that mechanical properties such as twist straightness, tensile strength, winding, and unwinding properties deteriorate when steel wires, especially high-strength special-strength wires, are hot-dip galvanized. This mechanical #j
There are various opinions as to the cause of the deterioration, but it is generally thought that it is due to the thermal effect of the galvanizing bath and the effect of the Fe-Zn gold edge compound layer that is formed between the plating layer and the base metal. ing.

Tensile strength in final use state is 9O? High strength F of /- or more
In the case of e-Ni alloy wire, it is also plated using a normal hot-dip galvanizing line. It was found that mechanical customization deteriorates when applied.

The present invention was achieved as a result of various studies in view of the above circumstances.
The strength, torsion value,
It is an object of the present invention to provide a method for manufacturing a Fe--Ni alloy wire t-a that does not cause deterioration in mechanical properties such as winding and unwinding and has a low coefficient of linear expansion.

In the present invention, a Fe-Ni alloy wire that has a tensile strength of 90 Ks+/- or more in the final use state is annealed in advance, hot-dip galvanized, and then the Fe-Ni alloy wire used in the present invention is drawn. Ni-based alloy wire is Fe-80~50%N
i0 to 50% N mirror-Ni alloy wire, if necessary, Co to improve the strength or reduce the coefficient of linear expansion.

Cr, Mn, Mg, Mo, C, Si, AI,
There is no problem even if additive elements such as Ti and Nb are included. In addition, its tensile strength is 9 in the final state of use (after wire drawing).
It is a type that can obtain 0 kf/- or more, and was manufactured in anticipation of changes in strength due to processing.

The annealing method in the present invention is patch type 1. Any continuous type may be used, and it is desirable that the elongation after annealing is 6% or more, and the annealing temperature and annealing time may be selected depending on the desired characteristics.

If annealing is performed before hot-dip galvanizing to give an elongation of, for example, 6% or more, it will not only prevent heat-affected metals during hot-dip galvanizing, but also reduce the sensitivity to the formation of a Fe-Zn compound layer and improve mechanical properties. This is thought to prevent the deterioration of

In the present invention, a normal plating line can be used for hot-dip galvanizing, and changes such as pretreatment, flux treatment, etc. may be made depending on the overall wire diameter, conditions, etc., without any problem. For squeezing, a normal charcoal squeezing method, gas squeezing method, or the like is used.

Further, in the present invention, wire drawing after galvanizing is performed for the purpose of increasing the strength and reducing the coefficient of linear expansion.

This reduction rate is desirably 10% or more; if it is less than 10%, stable wire drawing is not only impossible, but even if wire drawing is possible, the properties after mid-spring will be poor.

Example: In a Fe-39%Ni alloy, C, Si, Cr, Nb, Mo, and Til were added as elements to increase the strength, Mni was added as an element to improve workability, and AI was added as a deoxidizing agent. The alloyed gold added to Mg1 was melted, cast into an ingot, and then subjected to blooming and hot rolling to produce rough pure gold of 101111;.

After annealing the 9mm wire rod which was subjected to a peeling process,
The wire was drawn to the ff/ line. 500-8 in 4.0 silk f
The wire was annealed for several hours at a temperature of 0.0°C to obtain the elongation shown in Table 1, then hot-dip galvanized and then drawn to 3.5ml.

For comparison, wires with small elongation due to insufficient annealing even after annealing were hot-dip galvanized and wire-drawn (Comparative Example A4), and wires of 8.511 (without annealing) were hot-dip galvanized. (Comparative Example 45.6), and one that was hot-dip galvanized after annealing and was not wire drawn (Comparative Example &7).

The properties before galvanizing and the properties of the final product are shown in Table 1.

Table 1J: 41-3 according to the present invention has twist value, winding,
It can be seen that a galvanized Fe--Ni alloy wire with no deterioration in unwinding properties, high strength, and low coefficient of linear expansion can be obtained.

For this column, the comparison column is 4. A5. &6 has deteriorated twist value, winding, and unwinding characteristics, A5, JP66
is severely deteriorated. Furthermore, A7H has low strength and a high coefficient of linear expansion.

As mentioned above, the method of the present invention allows
Fe-Ni alloy wire that has a tensile strength of Kg/- or more is annealed in advance and then hot-dip galvanized? alms,
More wire drawing processing? This prevents heat effects during annealing and hot-dip galvanizing, reduces sensitivity to the formation of Fe-Zn intermetallic compound layers, prevents deterioration of mechanical properties, and improves strength through wire drawing. However, since the coefficient of linear expansion is lowered, it has the advantage of producing a Fe-Ni alloy wire part that has excellent mechanical properties such as strength, twisting value, winding, and unwinding, and has a low linear expansion coefficient. .

Claims (1)

[Claims] (1) Fe-Ni alloy wire that has a tensile strength of 90 Kp/- or more in the final use state is annealed in advance, then hot-dip galvanized, and then wire drawn f2) m after dulling F e -Ni-based alloy wire has an elongation of 6% or more (3) Wire drawing is performed with an area reduction rate of 10% or more