JPH0371022B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a wire for dot printers, which is very easy to draw into ultra-fine wire, the material cost is relatively low, and hardening heat treatment is easy. Yes, and has good eyelash properties.
This relates to printer wire. (Prior art) Wire for dot printers has high abrasion resistance, is strong, has high fatigue strength, and can be easily drawn and heat treated.
It is required to have good corrosion resistance and be inexpensive. Current printer wires are mainly made of hardened ultra-fine high-speed steel wires and cobalt-based alloys. High-speed steel wire is manufactured by repeatedly drawing and intermediate annealing to make the wire into an ultra-fine wire, quenching it, tempering it, and cutting it, but a long wire drawing process is required to make the high-speed steel wire into an ultra-fine wire. This has the disadvantage that the price is high. Although it has excellent abrasion resistance, it tends to lack tackiness, which can lead to breakage accidents during use. On the other hand, Co-based alloy has Co41%, Ni12%, Mo6%,
Because it contains a large amount of Cr20% and expensive alloying elements,
The disadvantage is that it is expensive. (Technical Issues) The present invention was made in view of these problems, and it is very easy to draw a wire to make an ultra-fine wire, the material cost is low, and the hardening heat treatment is simple. The purpose is to provide wire for dot printers with excellent toughness. (Technical means) That is, the present invention provides C0.03% or less in weight%,
Si0.10% or less, Mn0.10% or less, Ni16.0~19.0%,
Mo2.0~6.0%, Al0.02~0.20%, Ti0.70~1.90%,
After solution treatment of a steel wire drawing coil consisting of the remaining iron and impurities, the wire is drawn with an area reduction rate of 80% or more.
Draw it into a wire with a predetermined size of around 0.3mm in diameter,
After that, aging treatment is performed at around 480℃,
This is a wire for dot printers with good tackiness, characterized by precipitation hardening to Hv620 or higher. For rolled steel coils, e.g. approximately 820°C
After performing solution treatment by heating to and cooling with water,
The wire is drawn to an area reduction of approximately 90%, then subjected to solution treatment, and then drawn to an area reduction of approximately 90%.The process is repeated to make the diameter thinner, and finally the area reduction is approximately 90%.
After applying 95% wire drawing processing to make a wire with a specified size of around 0.3mm in diameter, it is heated at around 480℃ for 3 hours.
By performing aging treatment before and after (hours), precipitation hardening can be achieved to Hv620 or higher. Next, the reasons for limiting the composition of the dot printer wire according to the present invention will be described. Since C impairs the shine of low carbon martensite, it is set at 0.03% or less. Although Si and Mn have a deoxidizing effect, if the content exceeds 0.10%, the mattiness decreases, so each content was set at 0.1% or less. Ni is necessary to create a martensitic structure and to stabilize martensite up to the aging temperature, but if it is less than 16%, the effect is small, and if it exceeds 19%, retained austenite will appear. It was set at 16.0-19.0%. Mo is necessary to create intermetallic compounds and cause precipitation hardening through aging treatment, but if it is less than 2%, its effect will be small, and if it exceeds 6%, it will reduce the toughness. did. Al is added as a deoxidizing agent and also improves age hardening properties, so it was set at 0.02 to 0.20%. Ti is an intermetallic compound
It is necessary to form Ni ₃ Ti and cause precipitation hardening, but if it is less than 0.70%, its effect is small;
If it exceeds 0.7% to 1.9%, the eyelids will deteriorate. (Function) Steel with the above composition becomes low-carbon martensite by water-cooling solution treatment at approximately 820°C, and the hardness is as follows:
H _R It is relatively soft at C28~32, so it is easy to draw and draw, and the area reduction is about 95 without intermediate solution treatment.
Cold drawing wire drawing is possible up to %. In this way, after performing cold wire drawing with an area reduction rate of 80% or more, aging treatment at 480°C x 3 hours (hours) results in
Can be precipitation hardened to a high hardness of Hv620~650. Further, since the steel having the above composition does not contain expensive Co, it also has the advantage that the material cost is much lower than that of a high Co-based alloy. (Example) Hereinafter, an example of the present invention will be described. Table 1 is
The chemical compositions of the wire according to the present invention and the wire made of SKH9 and high Co-based alloy are shown. Symbol A indicates the wire according to the invention, symbol B
The symbol C indicates a wire made of SKH9, and the symbol C indicates a wire made of a Co-based alloy. SKH9 with symbol B can be cold drawn without intermediate annealing with an area reduction rate of 30 to 40%, so the intermediate annealing required to draw SKH9 from 5.5 mmφ to 0.3 mmφ wire is 12 to 16 mm. It is times.

[Table] On the other hand, the wire steel of the present invention indicated by symbol A can be drawn up to an area reduction of about 95% without intermediate solution treatment, so it can be drawn from a 5.5mmφ coil to a 0.3mmφ wire. Only three intermediate solution treatments are required. On the other hand, Co-based alloy with symbol C has 60%
It is possible to draw wire up to 5.5 without intermediate solution treatment.
The intermediate solution treatment required to draw the wire from mmφ to 0.3 mmφ is 8 times.

[Table] Next, Table 2 shows the heat treatment hardness of the 0.3 mmφ wire and the breakage rate after conducting a hammering test 10 ⁶ times as a printer wire. In other words, symbol A is a drawn coil that is solution-treated at 820°C, cold-drawn with a 95% reduction in area to a diameter of 0.3 mm, and then heated at 480°C for 3 hours.
(hours) of precipitation hardening to Hv650. As a result of the hammering test of printer wires with symbols A, B, and C ¹⁰⁶ times, the breakage rate of symbol B was 15%, whereas the breakage rate of symbols A and C was 0%, and the present invention It can be seen that the wire has excellent adhesion properties. (Effect) As explained above, the present invention has C0.03% or less,
Si0.10 or less, Mn0.1% or less, Ni16.0~19.0%,
Mo2.0~6.0%, Al0.02~0.2%, Ti0.7~1.90%,
After solution treatment of a steel wire drawing coil consisting of the remainder of iron and impurities, the wire is drawn with an area reduction rate of approximately 95% to form a wire with a predetermined size of approximately 0.3 mm in diameter.
It is precipitated and hardened to a hardness of Hv650 by aging at 480℃ for 3 hours (hours), so it has excellent toughness and wear resistance.
It is cheaper than base alloy wire.

Claims (1)

[Claims] 1% by weight, C0.03% or less, Si0.10% or less,
Mn0.10% or less, Ni16.0~19.0%, Mo2.0~6.0%,
After solution treatment, a wire-drawn coil made of steel consisting of 0.02-0.20% Al, 0.70-1.90% Ti, and the balance iron and impurities is subjected to wire drawing with an area reduction rate of 80% or more. Draw the wire to the specified dimensions, then
Wire for dot printers with good toughness, characterized by being aged at around 480℃ and precipitation hardened to Hv620 or higher.