JPH06108204A - Production of wire rod for spike pin and spike pin - Google Patents

Abstract

PURPOSE:To produce a spike pin excellent in corrosion resistance and wear resistance by subjecting a wire rod of a high elasticity high alloy steel with specific composition to solution heat treatment, to cold wiredrawing, and to forming into a spike pin and further performing precipitation hardening treatment. CONSTITUTION:A wire rod made of a high elasticity alloy steel having a composition consisting of, by weight, 7-35% Ni, 6-25% Cr, 7-45% Co, 3-12% Mo, 0.2-1.2% Ti, <0.20% C, and the balance Fe is subjected to solution heat treatment, to cold wiredrawing at >60% draft, and then to forming into a spike pin. Subsequently, the spike pin is heated up to 600 deg.C in an oxygen-free atmosphere to undergo precipitation hardening treatment, by which hardness is regulated to >=HV600 hardness. By this method, the spike pin excellent in wear resistance and corrosion resistance can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spike pin wire rod and a method for manufacturing a spike pin, which are most suitable for spike pins used in surf fishing.

[0002]

2. Description of the Related Art Conventionally, spike pins have a weight ratio of C:
0.6-1.10 high-carbon steel wire or stainless steel wire is generally used. The high-carbon steel wire is formed into a required spike shape and then hardened and tempered to give strength and toughness to obtain corrosion resistance. It was plated for the purpose.

[0003]

In the above-mentioned conventional spike pin, in order to impart strength and toughness, the carbon content of the high carbon steel wire is increased or the quenching and tempering temperature is changed. However, it was difficult to control the temperature, which caused variations. In addition, plating treatment is performed for corrosion resistance. However, contact with stones and rocks on the ground, rivers, and seas causes the plating to be worn away and the iron surface to appear, causing rust and not being able to withstand long-term use. The processing required a great deal of money.

Further, although stainless steel does not require plating, it has weak strength and low wear resistance, and therefore has a problem that the tip of the spike pin is worn and slippery after long-term use. Was there.

The present invention has been made in view of the above problems, and provides a spike pin wire and a method for manufacturing the spike pin, which is a spike pin having excellent wear resistance and corrosion resistance.

[0006]

In order to achieve the above object, the spike pin according to the first aspect of the present invention has a weight%.
Then, Ni: 7 to 35, Cr: 6 to 25, Co: 7 to 4
5, Mo: 3 to 12, Ti: 0.2 to 1.2, C: 0.
The balance is 20 or less, and the balance is Fe and an unavoidable impurity of high elastic alloy.

In the method for manufacturing a spike pin according to the second aspect of the present invention, the wire rod made of the above-mentioned high-elasticity alloy is subjected to solution treatment, cold drawn to a workability of 60% or more, and further formed into a spike pin. After that, a hardness of Hv600 or more is imparted by precipitation hardening treatment.

Next, the reason for limiting the chemical composition of the steel of the spike pin according to the present invention will be explained.

[0009] Ni assists the softening of the matrix during solution treatment during wire rod processing, facilitates wire rod processing, and also improves corrosion resistance. However, if it is excessive, wire drawability is deteriorated, so the range is set to 7 to 35% by weight.

Cr enhances corrosion resistance and gives strength. However, if excessive, it lowers the toughness, so the range is made 6 to 25% by weight.

Co dissolves in the matrix to increase the hardness of the matrix and is effective for improving the corrosion resistance, but if it becomes excessive, it becomes brittle, so the range is 7 to 45% by weight.

[0012] Mo improves the strength and the corrosion resistance similarly to Cr, but when it is excessive, it becomes hard in cold working and becomes difficult to work, so the range is made 3 to 12% by weight.

Ti has the effect of increasing the hardness because the crystal grains are made finer or the compound is precipitated by heat treatment. However, if it becomes excessive, it becomes too hard in processing and it becomes difficult to process, so the range is made 0.2 to 1.2% by weight.

C is an element that raises the elastic limit, but if it is excessive, the toughness decreases, so its range is 0.20% by weight or less.

[0015]

In the present invention, since the spike pin is formed by using a high elastic alloy containing Co, the wear resistance and corrosion resistance required for the spike pin are improved.

[0016]

EXAMPLES The present invention will be described below based on examples.
Table 1 shows the chemical composition, A and B are examples of the present invention, and C and D are conventional examples.

[0017]

[Table 1]

Next, each wire having the chemical composition of A, B, C and D is subjected to cold wire drawing from 5.5 mmφ.
Precipitation hardening treatment was performed in a non-oxidizing atmosphere at a temperature of 00 ° C., and D was quenched and tempered to obtain 2.0 mmφ spike pins. By the way, the above A and B were subjected to solution treatment before cold drawing. The cold wire drawing is performed at a workability of about 86.8%. Then, a tensile test based on the metallic material tensile test method and Vickers hardness by a Vickers hardness meter were measured for each spike pin having the chemical composition of A to D of the above symbols. The higher the tensile strength and hardness, the better the wear resistance.

Next, the sample D was plated with a hard chrome having a plating thickness of 10 μm, and the others were immersed in seawater for 5 days to perform a corrosion resistance test. Further, as shown in FIG. 1, a sliding wear test was performed in which the sample S was pressed against the side surface of the alumina disk G rotating at 600 rpm for 60 seconds, and the degree of the wear was measured to judge the wear resistance. Furthermore, the corrosion resistance test of the sliding wear test was also performed by the same method as the above corrosion resistance test. The results are shown in Table 2.

[0020]

[Table 2]

As is clear from Table 2, Conventional Example C was excellent in corrosion resistance but inferior in abrasion resistance, and Conventional Example D was inferior in corrosion resistance after the sliding abrasion test.
On the other hand, it was found that Examples A and B were excellent in both corrosion resistance and wear resistance, and Example B was more excellent in wear resistance.

[0022]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned constitution, it has excellent corrosion resistance and abrasion resistance, and since it does not require plating treatment, it has an excellent effect that there is no pollution due to waste liquid treatment and the manufacturing cost is low. Have.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a sliding wear test of a spike pin of the present invention on an alumina plate.

[Explanation of symbols]

 G Alumina disk S sample

Claims (2)

[Claims] 1. Ni: 7-35, Cr: 6-
25, Co: 7 to 45, Mo: 3 to 12, Ti: 0.2
.About.1.2, C: 0.20 or less, a balance of Fe and a wire material for a spike pin made of a highly elastic alloy of inevitable impurities. 2. By weight%, Ni: 7-35, Cr: 6-
25, Co: 7 to 45, Mo: 3 to 12, Ti: 0.2
.About.1.2, C: 0.20 or less, and after subjecting the high elastic alloy wire consisting of the balance Fe and unavoidable impurities to the solution treatment,
A method for producing a spike pin, which comprises performing cold wire drawing at a workability of 60% or more, further forming a spike pin, and then imparting a hardness of Hv 600 or more by precipitation hardening treatment.