JPH05320829A - Wire rod for fishhook - Google Patents

Abstract

PURPOSE:To obtain the wire rod for a fishhook excellent in strength, toughness and wear resistance and having excellent corrosion resistance even without being plated and coated by specifying the chemical compsn. of steel constituted of C, Cr, Mo, V and Fe. CONSTITUTION:The objective wire rod for a hook is a one in which the chemical compsn. of steel is constituted of, by weight, 1.0 to 1.4% C, 16 to 20% Cr, 0.5 to 1.5% Mo and 0.5 to 1.5% V, and the balance Fe with impurities, and by largely adding Cr in particular, the improvement of its strength, toughness, wear resistance and corrosion resistance required as a fishhook is attained. In this way, the hook showing excellent corrosion resistance in a state of no plating even in sea fishing and capable of long term use can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rod used for fishing hooks.

[0002]

2. Description of the Related Art Conventionally, a hard steel wire rod having a high C content (JIS G 3506) has been generally used as a wire rod for a fishing hook, and after being formed into a fish hook of a required size and shape, it is hardened and tempered to give strength and toughness. After that, corrosion resistance was imparted by Ni plating or painting.

[0003]

In order to impart desired strength and toughness, the conventional fishing hooks are configured so that the carbon content of the steel wire is adjusted or the tempering and tempering temperatures are changed. .. However, with the above steel wire, when the hardness exceeds a certain level, the toughness deteriorates and it becomes easy to break, and the specific hardness cannot be exceeded. Therefore, the conventional fishing hook lacks strength and toughness and stretches or breaks during use, and sometimes the tip of the needle or the like wears out due to contact with rocks or rocks at the bottom of the river or the sea. It was rusted due to peeling of the plating or coating and could not withstand long-term use.

The present invention has been made in view of the above problems of the prior art, and is excellent in strength, toughness, wear resistance, and corrosion resistance. Particularly, in terms of corrosion resistance, there is no need for plating or coating as in the prior art. An object of the present invention is to provide a wire rod for a fishing hook, which is a fishing hook having excellent corrosion resistance.

[0005]

The wire rod for a fishing hook of the present invention comprises:
By adjusting the chemical composition of the steel, it exhibits excellent strength, toughness, wear resistance, and corrosion resistance when formed into fishing hooks, and the chemical composition is% by weight, and C: 1.0 to 1.4. ,
Cr: 16-20, Mo: 0.5-1.5, V: 0.5
˜1.5, the balance consisting of Fe and impurities.

Next, the reason for limiting the chemical composition of the steel of the wire for a fishing hook according to the present invention will be described. C is quenching,
It is an element necessary to secure the hardness necessary as a fishhook by tempering, and 1.0 wt% or more is necessary, but 1.4w
If it exceeds t%, the toughness decreases, so the range is 1.0.
˜1.4 wt%.

[0007] Cr improves the hardenability, eliminates the problem of insufficient strength due to poor quenching, increases the temper softening resistance to easily secure the hardness, and combines with C to form Cr carbide. Improves wear resistance. Further, it forms a solid solution in the matrix to improve the corrosion resistance. However, if it becomes excessive, Cr
The range is 1 because carbides increase and toughness decreases.
6 to 20 wt%.

[0008] Mo strengthens the matrix, further forms carbides, and improves toughness, but when it becomes excessive, carbides increase and conversely lower toughness, so the range is 0.5-.
It is set to 1.5 wt%.

V increases the temper softening resistance and makes the structure finer, so that it improves toughness at high strength, forms carbides, and also improves wear resistance. However, if it becomes excessive, the toughness decreases, so the range is set to 0.5.
˜1.5 wt%.

The present invention improves the strength, toughness, wear resistance and corrosion resistance required for fishing hooks, especially by adding a large amount of Cr.

[0011]

EXAMPLES The present invention will be described below based on examples.
Table 1 shows the chemical composition of steel, symbols A, B and C are examples of the present invention, and symbols D, E, F and G are comparative examples.
The symbol H is a conventional example.

[0012]

[Table 1]

Then, the steel wires of Examples A, B and C and Comparative Examples D, E, F, G and Conventional Example H were formed and subjected to quenching and tempering. Ni plating was performed to obtain a fishing hook 4 having a wire diameter of 0.5 mm and including a chimoto 1, a tip 2, and a bur 3 as shown in FIG. Note that the examples and comparative examples do not have Ni plating.

Next, using the wire rods and fishing hooks of Examples A, B, and C of the present invention and Comparative Examples D, E, F, and G, and Conventional Example H, the strength, toughness, wear resistance, and corrosion resistance were evaluated. When tested, the results shown in Table 2 were obtained.

[0015]

[Table 2]

The strength and toughness are tested by processing each steel wire shown in Table 1 into a wire diameter of 0.5 mmΦ, quenching and tempering the straight steel wire, and performing a three-point bending test using these steel wires. It was And the strength is the measured load at the time of folding,
The larger the value, the higher the strength. The toughness is evaluated by the amount of bending at the time of folding, and the higher the toughness is, the greater the amount of bending becomes, so that the toughness is broken. The toughness is expressed by an index when the conventional amount of bending is 100, and comparatively evaluated. High toughness.

The wear resistance and the corrosion resistance were evaluated by expressing the index with the conventional product as 100 by checking the wear degree and rusting degree of the fishing hook by actually sea fishing with the above-mentioned fishing hook 4. The larger the size, the better the wear resistance and corrosion resistance.

From Table 2, Examples A, B and C of the present invention are
It has excellent balance of strength, toughness, wear resistance, and corrosion resistance as compared with other materials, shows a value excellent in strength as compared with Comparative Example D, and has excellent toughness as compared with Comparative Examples E and F. In addition, the abrasion resistance and the corrosion resistance are superior to those of Comparative Example G. And the strength is about 15 compared with Conventional Example H.
%, Toughness was improved by about 20%, wear resistance was improved by about 75%, and corrosion resistance was improved by about 5 times.

[0019]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned constitution, the strength, toughness, wear resistance and corrosion resistance are improved, and particularly in sea fishing where corrosion resistance is required, excellent corrosion resistance is exhibited without plating. The fishing hook can be used for a long period of time, and it has the effect of significantly improving the quality and reliability of the fishing hook.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a fishing hook manufactured using the fishing wire of the present invention.

[Explanation of symbols]

 1 Chimoto 2 Needle tip 3 Burr 4 Fishing hook

Claims (1)

[Claims] 1. The chemical composition of steel in% by weight, C: 1.0 to.
1.4, Cr: 16 to 20, Mo: 0.5 to 1.5,
V: 0.5 to 1.5, a wire rod for a fishing hook consisting of the balance Fe and impurities.