JP5590773B2 - Steel material control method - Google Patents
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- JP5590773B2 JP5590773B2 JP2008078836A JP2008078836A JP5590773B2 JP 5590773 B2 JP5590773 B2 JP 5590773B2 JP 2008078836 A JP2008078836 A JP 2008078836A JP 2008078836 A JP2008078836 A JP 2008078836A JP 5590773 B2 JP5590773 B2 JP 5590773B2
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本発明は、強磁場を利用した鋼の機械的性質の制御に関するものである。さらに詳しくは、高炭素鋼線材の伸線加工時の時効硬化、又は、伸線加工後の室温時効、及び、熱間圧延における低温領域でのフェライト域脱炭を抑制する方法に関する。 The present invention relates to control of mechanical properties of steel using a strong magnetic field. More specifically, the present invention relates to a method for suppressing age hardening at the time of wire drawing of a high carbon steel wire, room temperature aging after wire drawing, and ferrite region decarburization in a low temperature region in hot rolling.
鋼の侵入型元素の拡散により引き起こされる種々の現象を抑制することにより組織を制御して、機械的性質を調整する方法が従来より用いられている。例えば、高炭素鋼線の伸線加工時の発熱による延性劣化を抑制する技術として、特許文献1に開示されている方法がある。
Conventionally, a method of adjusting a mechanical property by controlling a structure by suppressing various phenomena caused by diffusion of interstitial elements in steel has been used. For example, there is a method disclosed in
この方法は、伸線加工中に発生する加工発熱により高温となり、侵入型元素が拡散し易くなる現象について、鋼線を直接水で冷却することにより、延性が劣化するのを防ぐ技術である。 This method is a technique for preventing the ductility from deteriorating by directly cooling the steel wire with water with respect to a phenomenon in which the high temperature is generated by the heat generated during the wire drawing and the interstitial elements are easily diffused.
しかし、この直接鋼線を水冷する方法を用いても、スチールコードのような0.15〜0.4mm径の3.0GPa以上のワイヤでは、加工温度の低下により変形抵抗が増加し、それによって、かえって発熱の増加が有り、十分に冷却の効果を得られないという問題があった。 However, even if this method of directly cooling the steel wire is used, a wire with a diameter of 0.15 to 0.4 mm, such as a steel cord, of 3.0 GPa or more increases deformation resistance due to a decrease in processing temperature, thereby On the contrary, there was an increase in heat generation, and there was a problem that a sufficient cooling effect could not be obtained.
一方、Siを多量に含む高炭素鋼を熱間圧延で線材圧延する場合、熱間圧延の過程で、鋼材の温度がAe3変態点以下の温度になると、フェライトが生成し、フェライト中の炭素の拡散速度が大きいために、脱炭が促進されるとの問題があった。 On the other hand, when the rolled wire rod of high carbon steel containing Si in a large amount in hot rolling, in the course of hot rolling, the temperature of the steel material to a temperature below Ae 3 transformation point, ferrite is generated, the carbon in the ferrite There was a problem that decarburization was promoted because of the high diffusion rate.
このような課題に対しては、例えば、特許文献2に開示されているような技術がある。この方法では、鋼に、アンチモンを添加することで、鋼の表面に、Fe酸化物より緻密なSb酸化物を形成し、鋼の表面からの炭素が抜け出すのを防止するという技術である。
For such a problem, for example, there is a technique disclosed in
しかし、この方法では、アンチモンなどの、環境負荷が大きい元素を用いるため、実用に際しては制限が多く、一般的に用いることができないとの問題があった。 However, this method uses an element having a large environmental load such as antimony, so that there are many limitations in practical use, and there is a problem that it cannot be generally used.
このように、加工技術、鋼材成分などの工夫を行なっても、鋼の侵入型元素の拡散によって生じる問題に対する解決策には限界があり、侵入型元素の拡散に関する、新たな制御技術方法が必要とされていた。 As described above, even if processing techniques, steel material components, etc. are devised, there are limits to the solutions to the problems caused by the diffusion of interstitial elements in steel, and new control technology methods related to the diffusion of interstitial elements are necessary. It was said.
本発明は、上記問題点に鑑みてなされた発明であり、鉄、鋼などの鋼材の機械的性質に影響を与える炭素、窒素、水素などの侵入型元素の拡散の制御方法であり、これを通じて、鋼材の機械的性質を改善する技術を提供することを目的としている。 The present invention has been made in view of the above problems, and is a method for controlling the diffusion of interstitial elements such as carbon, nitrogen, and hydrogen that affects the mechanical properties of steel materials such as iron and steel. The purpose is to provide a technique for improving the mechanical properties of steel materials.
さらに、具体的には、例えば、スチールコード、ベルトコード、ゴムホース用ワイヤ、ロープ用ワイヤなどの細引き用途に使用されるピアノ線材、硬鋼線材などに用いられる高炭素鋼線材に関し、熱間圧延後の伸線加工性に優れ、伸線加工の際に内部欠陥を発生し難い、高延性の高炭素鋼線材を提供することにより、中間パテンティング処理を省略することが可能な、高延性の高炭素鋼線材を提供することを目的としている。 More specifically, for example, hot-rolling for high-carbon steel wire used for piano wire, hard steel wire, etc. used for thinning applications such as steel cord, belt cord, rubber hose wire, rope wire, etc. By providing a high carbon steel wire with high ductility, which is excellent in later wire drawing workability and hardly generates internal defects during wire drawing, it is possible to omit intermediate patenting treatment, It aims to provide a high carbon steel wire rod.
本発明は、以下を要旨とする。 The gist of the present invention is as follows.
(1)炭素を0.3質量%以上含む鋼を冷間加工する際に、
前記冷間加工がダイスを用いて行う伸線加工であり、かつ、
少なくとも、当該ダイスの出側位置で当該鋼に1テスラ以上の強磁場をかけながら、減面率10%以上の加工を行なうことを特徴とする鋼材の材質制御方法。
(1) When cold working steel containing 0.3% by mass or more of carbon,
The cold working is wire drawing performed using a die, and
A method for controlling the material of a steel material, characterized in that at least a processing with a reduction in area of 10% or more is performed while applying a strong magnetic field of 1 Tesla or more to the steel at the exit side of the die.
本発明により、従来では不可能であった鋼の加工時に発生する時効硬化、加工後に発生する室温時効、又は、熱間圧延時に発生するフェライト域での脱炭を抑制することが可能となった。 According to the present invention, it has become possible to suppress age hardening that occurs during processing of steel, which has been impossible in the past, room temperature aging that occurs after processing, or decarburization in the ferrite region that occurs during hot rolling. .
このことにより、例えば、伸線ワイヤの時効硬化を抑制すること、及び、高炭素鋼を熱間圧延する際のフェライト域圧延で、脱炭を、磁場をかけることで抑制することが可能となり、線材又は鋼線の高延性化が可能となった。 By this, for example, it is possible to suppress age hardening of the drawn wire, and to suppress decarburization by applying a magnetic field in ferrite region rolling when hot rolling high carbon steel, High ductility of wire or steel wire has become possible.
本発明者らは、強磁場中におけるフェライト中の炭素の拡散速度に着目して、本発明に至った。本発明者らが測定を行なった強磁場中の炭素の拡散速度を、図1に示す。図1に示すように、6テスラの強磁場をかけることにより、鉄中の炭素の拡散係数は、ほぼ4分の1となっている。 The inventors of the present invention have arrived at the present invention by paying attention to the diffusion rate of carbon in ferrite in a strong magnetic field. The carbon diffusion rate in the strong magnetic field measured by the present inventors is shown in FIG. As shown in FIG. 1, by applying a strong magnetic field of 6 Tesla, the diffusion coefficient of carbon in iron is approximately one-fourth.
つまり、鋼材に強磁場をかけることにより、鋼中炭素の拡散速度が4分の1程度に低下する。このことを利用すれば、鋼の機械的性質の変化に、炭素の拡散が影響しているものに関しては、磁場をかけることにより、炭素の拡散を遅延させることが可能となる。 That is, by applying a strong magnetic field to the steel material, the diffusion rate of carbon in the steel is reduced to about a quarter. By utilizing this fact, carbon diffusion can be delayed by applying a magnetic field to those in which carbon diffusion affects the change in the mechanical properties of steel.
そして、この炭素の拡散速度の抑制は、炭素含有量が0.3質量%以上の鋼で、効果が顕著である。 And suppression of this carbon diffusion rate is remarkable in steel with a carbon content of 0.3% by mass or more.
また、この磁場による炭素の拡散速度抑制効果は、図2に示すように、磁場の強度に比例して大きくなる。 Further, the effect of suppressing the diffusion rate of carbon by the magnetic field increases in proportion to the strength of the magnetic field, as shown in FIG.
したがって、磁場により炭素の拡散速度に及ぼす影響が明瞭となる1テスラ以上の磁場をかける必要がある。本発明では、1テスラ以上の磁場としているが、期待する効果に応じて、磁場の強度を調整することが可能である。 Therefore, it is necessary to apply a magnetic field of 1 Tesla or higher that clearly shows the influence of the magnetic field on the diffusion rate of carbon. In the present invention, a magnetic field of 1 Tesla or more is used, but the strength of the magnetic field can be adjusted according to the expected effect.
鋼の加工を行う場合、加工度が小さいと、鋼材中心部まで圧縮応力が届かず、内部クラックを生じるので、加工減面率を、少なくとも、10%以上とする必要がある。 When processing steel, if the degree of processing is small, the compressive stress does not reach the center of the steel material, and internal cracks are generated. Therefore, the processing area reduction rate needs to be at least 10% or more.
また、ダイスを用いる伸線加工の場合、ダイスの出側で、最も鋼材の温度が高温となるので、ダイスを使用する加工の場合は、少なくとも、ダイスの出側位置で、強磁場を掛ける必要がある。 Also, in the case of wire drawing using a die, the temperature of the steel material is the highest on the exit side of the die, so in the case of processing using a die, it is necessary to apply a strong magnetic field at least at the exit side position of the die. There is.
なお、この伸線加工を行なった後に行なうスキンパス伸線は、通常、減面率が1%以上10%未満であるが、伸線ワイヤの内部に、カッピー破断を引き起こすクラックを生じない条件であれば、本発明の強磁場を利用することが可能である。 Note that the skin pass wire drawing performed after this wire drawing processing usually has a surface reduction rate of 1% or more and less than 10%, but it is a condition that does not cause a crack that causes a capty break in the wire drawing wire. For example, the strong magnetic field of the present invention can be used.
同様に、鋼材の加工後に、室温で起きる時効現象の抑制にも用いることができる。この場合、特に、0.3%以上の鋼線で室温時効が現れるので、0.3%以上炭素を含む鋼線に適用する。 Similarly, it can be used to suppress the aging phenomenon that occurs at room temperature after the steel material is processed. In this case, since room temperature aging appears especially with a steel wire of 0.3% or more, it is applied to a steel wire containing 0.3% or more of carbon.
また、室温時効は炭素量ばかりでなく、伸線加工により導入された転位密度にも影響されるので、真ひずみで1.5以上の加工を行なった場合に、加工後、1テスラ以上の磁場をかけた状態で保持することが効果的である。 In addition, since room temperature aging is affected not only by the carbon content but also by the dislocation density introduced by wire drawing, a magnetic field of 1 Tesla or higher after processing when processing at 1.5 or more true strain is performed. It is effective to hold in a state of applying.
なお、このような強磁場による効果は、炭素に代表されるが、その他の侵入型元素である窒素、又は、水素であっても、同様に、強磁場により拡散係数を小さくすることが可能である。 The effect of such a strong magnetic field is typified by carbon, but even with other interstitial elements such as nitrogen or hydrogen, the diffusion coefficient can be similarly reduced by a strong magnetic field. is there.
次に、鋼材に強磁場をかけることにより、鋼材表層の脱炭も抑制できることについて、説明する。 Next, the fact that decarburization of the steel material surface layer can be suppressed by applying a strong magnetic field to the steel material will be described.
磁場をかけることで脱炭を抑制する場合に、フェライト域脱炭の影響が大きくなるのは、0.3%以上の炭素を含む鋼である。また、フェライト域脱炭は、炭素の拡散が早くなる500℃以上の温度域で影響が大きく、γ中に、フェライトが生成するAe3変態点以下の温度域で、脱炭が大きくなる。このため、500℃以上、Ae3変態点以下の温度範囲で磁場をかけるものとする。 In the case where decarburization is suppressed by applying a magnetic field, the influence of ferrite region decarburization is increased in steel containing 0.3% or more of carbon. In addition, the decarburization of the ferrite region has a large influence in a temperature range of 500 ° C. or more at which carbon diffusion becomes fast, and decarburization becomes large in a temperature region below the Ae 3 transformation point where ferrite forms in γ. Therefore, 500 ° C. or higher, it is assumed to apply a magnetic field in a temperature range of Ae 3 transformation point.
磁場の強度は、圧延中の雰囲気に影響されるので、脱炭の大きさや、必要な脱炭の制御範囲によって調整することが可能である。一般的には、1テスラ以上の強度で脱炭抑制の効果が大きくなるので、1テスラ以上の磁場をかけるものとする。 Since the strength of the magnetic field is affected by the atmosphere during rolling, it can be adjusted according to the size of decarburization and the required control range of decarburization. In general, since the effect of suppressing decarburization increases with an intensity of 1 Tesla or higher, a magnetic field of 1 Tesla or higher is applied.
また、熱間加工の際にも、Ae3変態点以下で脱炭が起きるので、熱間圧延の際に、Ae3変態点以下の温度領域で、当該鋼に強磁場をかけながら圧延することも、脱炭を抑制するのに効果的である。 Also, since decarburization occurs below the Ae 3 transformation point during hot working, rolling the steel while applying a strong magnetic field in the temperature range below the Ae 3 transformation point. Is also effective in suppressing decarburization.
(実施例1)
実炉で、JIS SWRS82A相当の鋼を溶製し、熱間圧延で5.5mm径の線材とした。得られた線材に、伸線加工と中間熱処理を施して、1.85mm径のワイヤとした。その後、950℃でオーステナイト化を行い、575℃の鉛浴に浸漬する鉛パテンティング処理を行なった。さらに、湿式の連続伸線機を用いて、伸線加工で、1.85mm径の鋼線を0.3mm径のワイヤにした。
Example 1
In an actual furnace, steel corresponding to JIS SWRS82A was melted and hot rolled to obtain a wire having a diameter of 5.5 mm. The obtained wire was subjected to wire drawing and intermediate heat treatment to obtain a wire having a diameter of 1.85 mm. Thereafter, austenitization was performed at 950 ° C., and lead patenting treatment was performed by immersing in a 575 ° C. lead bath. Furthermore, a 1.85 mm diameter steel wire was made into a 0.3 mm diameter wire by wire drawing using a wet continuous wire drawing machine.
本発明法のワイヤの場合、連続伸線機のダイス出側に、強磁場をかける磁場発生装置を配置して、伸線加工を行なった。 In the case of the wire according to the present invention, a magnetic field generator for applying a strong magnetic field was disposed on the die exit side of the continuous wire drawing machine to perform wire drawing.
表1に、最終ダイスの出側でワイヤにかけた磁場強度、伸線加工後に直ちに行なった引張試験結果、及び、捻回試験におけるデラミネーションの有無を示す。本発明法1から3は、引張強度TSが少し低いが、捻回試験におけるデラミネーションは発生していない。比較法4は、磁場をかけなかった場合で、伸線加工後の捻回試験でデラミネーションが発生している。
Table 1 shows the strength of the magnetic field applied to the wire on the exit side of the final die, the result of a tensile test performed immediately after wire drawing, and the presence or absence of delamination in the twist test. In the
また、表1の本発明法3のサンプルを室温中に放置した場合と、強磁場をかけた状態で室温中に置いた場合とのワイヤの機械的性質の変化を、表2に示す。強磁場をかけることで、室温での時効が抑制されていることが判る。
Table 2 shows changes in the mechanical properties of the wire when the sample of the
(実施例2)
実炉で、表3に成分組成を示す鋼を溶製した。熱間圧延で9mm径の線材とした。1000℃でオーステナイト化した後、800℃から水冷を行い、7mm径に大気中で加工を行い、その後、直ちに、600℃の鉛浴に浸漬するパテンティング処理を行なった。その際に、6テスラの強磁場をかける本発明法と、磁場をかけない比較法の2つの条件で試験をした。
(Example 2)
In an actual furnace, steels having component compositions shown in Table 3 were melted. A 9 mm diameter wire was obtained by hot rolling. After austenitizing at 1000 ° C., water cooling was performed from 800 ° C., processing was performed in the air to a diameter of 7 mm, and then a patenting process was performed in which it was immediately immersed in a 600 ° C. lead bath. At that time, the test was conducted under the two conditions of the present method in which a strong magnetic field of 6 Tesla was applied and the comparative method in which no magnetic field was applied.
得られた線材の脱炭深さを、表4に示す。本発明法により、脱炭深さが小さくなっていることが解る。 Table 4 shows the decarburization depth of the obtained wire. It can be seen that the decarburization depth is reduced by the method of the present invention.
Claims (1)
前記冷間加工がダイスを用いて行う伸線加工であり、かつ、
少なくとも、当該ダイスの出側位置で当該鋼に1テスラ以上の強磁場をかけながら、減面率10%以上の加工を行なう
ことを特徴とする鋼材の材質制御方法。 When cold working steel containing 0.3 mass% or more of carbon,
The cold working is wire drawing performed using a die, and
A method for controlling the material of a steel material, characterized in that at least a processing with a reduction in area of 10% or more is performed while applying a strong magnetic field of 1 Tesla or more to the steel at the exit side of the die.
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