JPH09182911A - Steel wire for spring and its production - Google Patents
Steel wire for spring and its productionInfo
- Publication number
- JPH09182911A JPH09182911A JP35296095A JP35296095A JPH09182911A JP H09182911 A JPH09182911 A JP H09182911A JP 35296095 A JP35296095 A JP 35296095A JP 35296095 A JP35296095 A JP 35296095A JP H09182911 A JPH09182911 A JP H09182911A
- Authority
- JP
- Japan
- Prior art keywords
- orientation
- magnetic field
- steel wire
- spring
- rigidity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- Metal Extraction Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はばね用鋼線とその製
造方法に関するものである。TECHNICAL FIELD The present invention relates to a spring steel wire and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】JIS G 4314 SUS304-WPB などは準安定オ
ーステナイト系ステンレス鋼線であり、引き抜き加工中
の加工誘起マルテンサイト変態によって生成するマルテ
ンサイト相が鋼線の強度に大きく寄与している。そのた
め加工誘起マルテンサイト変態を効率的に起こして鋼線
を高強度化する種々の検討が行われている。例えば、
「ばね技術研究会1995年度秋季講演会講演論文集(1995-
11),p1」に示されているように極低温にて伸線加工する
方法などが検討されている。また、磁場の利用について
は「日本金属学会講演概要、Vol.109th(1991),p78」に
示すように、液体Ｈｅ中という極低温において８テスラ
という通常の電磁石では作り得ない大きな磁場が加工誘
起マルテンサイト変態に及ぼす影響を調査した例があ
る。一方、工業的に利用可能な電磁石で作りうる２テス
ラ以下での磁場の影響を示した例はない。2. Description of the Related Art JIS G 4314 SUS304-WPB and the like are metastable austenitic stainless steel wires, and the martensite phase generated by the processing-induced martensitic transformation during drawing greatly contributes to the strength of the steel wire. Therefore, various studies have been conducted to efficiently cause the work-induced martensitic transformation to increase the strength of the steel wire. For example,
`` Spring Technology Research Group 1995 Autumn Lecture Proceedings (1995-
11), p1 ”, a method of wire drawing at cryogenic temperature is being studied. Regarding the use of a magnetic field, as shown in "Summary of the Japan Institute of Metals, Vol.109th (1991), p78", a large magnetic field of 8 Tesla, which cannot be created by an ordinary electromagnet, is induced at extremely low temperature in liquid He. There is an example of investigating the effect on martensitic transformation. On the other hand, there is no example showing the influence of a magnetic field below 2 Tesla that can be produced by an industrially available electromagnet.
【０００３】[0003]
【発明が解決しようとする課題】しかし、鋼線の高強度
化・高剛性率化に関して極低温での伸線加工は冷却また
は冷媒のコスト、生産性を考慮すると必ずしも有効な手
段とはいえない。また、極低温でかつ８テスラという大
きな磁場を印加することもコストを考慮に入れると有効
な手段とはいえない。従って、本発明は高強度・高剛性
率のばね用鋼線と、鋼線の特性とコスト・生産性などと
が見合い、効率的に加工誘起マルテンサイト変態を誘起
するばね用鋼線の製造方法を提供するものである。However, in order to increase the strength and rigidity of steel wire, wire drawing at extremely low temperatures is not always an effective means in consideration of the cost and productivity of cooling or refrigerant. . Further, applying a large magnetic field of 8 Tesla at an extremely low temperature is not an effective means in view of cost. Therefore, the present invention is a method for manufacturing a spring steel wire for efficiently inducing work-induced martensitic transformation by matching the high strength / high rigidity spring steel wire with the characteristics and cost / productivity of the steel wire. Is provided.
【０００４】[0004]
【課題を解決するための手段】本発明は上記の課題を解
決するためになされたもので、常温において電磁石によ
り２テスラ程度の磁場を印加すると加工誘起マルテンサ
イト変態が促進され、かつ変態したマルテンサイト相の
結晶方位が磁場の向きによって制御できるという知見に
基づくものである。即ち、加工誘起マルテンサイト変態
が起こる引き抜き加工時に０．５テスラ以上の磁場を印
加することにより、マルテンサイト変態を効率的に起こ
してマルテンサイト相量を増加させる。さらに磁場の向
きを限定することによりマルテンサイト相の結晶方位を
制御し、鋼線の強度と剛性率を向上させる。マルテンサ
イト相の結晶方位は、［１００］方位が線軸方向に対し
て３０°以内となるように制御する。このような結晶方
位を有する鋼線は特にばね用として好適である。The present invention has been made to solve the above-mentioned problems, and when a magnetic field of about 2 tesla is applied by an electromagnet at room temperature, the work-induced martensite transformation is promoted and the transformed martensite is transformed. This is based on the finding that the crystal orientation of the site phase can be controlled by the direction of the magnetic field. That is, by applying a magnetic field of 0.5 Tesla or more during the drawing process in which the work-induced martensitic transformation occurs, the martensitic transformation is efficiently caused to increase the martensite phase amount. Furthermore, by limiting the direction of the magnetic field, the crystal orientation of the martensite phase is controlled, and the strength and rigidity of the steel wire are improved. The crystal orientation of the martensite phase is controlled so that the [100] orientation is within 30 ° with respect to the linear axis direction. A steel wire having such a crystal orientation is particularly suitable for springs.
【０００５】[0005]
【発明の実施の形態】以下、本発明をより詳細に説明す
る。 ＜５０％以上のマルテンサイト相の［１００］方位が線
軸方向に対して３０°以内に配向＞マルテンサイト相に
おいて［１００］方位での剛性率が他の結晶方位のそれ
よりも高く、この方位が線軸方向に対して３０°以内の
範囲にあれば実質的に線軸方向と平行とみなしてよく、
ばね用鋼線の剛性率が向上される。そして、５０％以上
のマルテンサイト相の［１００］方位が線軸方向と実質
的に平行となって初めて剛性率の実用的な向上が認めら
れるからである。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. <50% or more of the [100] orientation of the martensite phase is oriented within 30 ° with respect to the linear axis direction> In the martensite phase, the rigidity in the [100] orientation is higher than that of other crystal orientations, and this orientation If is within the range of 30 ° with respect to the line axis direction, it may be regarded as substantially parallel to the line axis direction,
The rigidity of the steel wire for spring is improved. Then, the practical improvement of the rigidity can be recognized only when the [100] orientation of 50% or more of the martensite phase becomes substantially parallel to the direction of the linear axis.
【０００６】＜磁場の作用＞マルテンサイト変態は非磁
性のオーステナイト相から強磁性のマルテンサイト相へ
の変態である。変態の際に磁場を印加することによって
マルテンサイト相の自由エネルギーが低下し、マルテン
サイト相が生成し易くなる。 ＜磁場の向き＞変態中に磁場を印加することによりマル
テンサイト相における容易磁化方向である［１００］方
位が磁場の向きに成長し易くなる。磁場の向きを線軸方
向とすれば線軸方向に［１００］方位が揃う。 ＜磁場の強さ＞０．５〜２．０テスラが好ましい。これ
は０．５テスラ未満では磁場印加の効果が小さく、２．
０テスラを越える磁場を発生させるには通常の電磁石で
は不十分であり大きな費用がかかるためである。<Operation of magnetic field> The martensite transformation is a transformation from a non-magnetic austenite phase to a ferromagnetic martensite phase. By applying a magnetic field during the transformation, the free energy of the martensite phase is lowered and the martensite phase is easily generated. <Direction of magnetic field> By applying a magnetic field during transformation, the [100] orientation, which is the easy magnetization direction in the martensite phase, easily grows in the direction of the magnetic field. If the direction of the magnetic field is the line axis direction, the [100] orientation is aligned in the line axis direction. <Magnetic field strength> 0.5 to 2.0 tesla is preferable. If it is less than 0.5 Tesla, the effect of applying a magnetic field is small.
This is because ordinary electromagnets are not sufficient to generate a magnetic field exceeding 0 Tesla and are expensive.
【０００７】[0007]
【実施例】以下、本発明の実施例を説明する。SUS304鋼
（重量％で、Ｃ:0.07%, Ni:8.3%, Cr:18.2% ）を熱間圧
延にて線径5.5mm の線材とした後、(a) １．５テスラの
磁場を線軸方向に印加しながら、(b)０．３テスラの磁
場を線軸方向に印加しながら、(c) 磁場なしで、伸線加
工して線径1.8mm の鋼線とした。これをＸ線によるマル
テンサイト量の測定、電子線回析による［１００］方位
の集積度測定および剛性率測定を行った。集積度測定は
マルテンサイト相の３０個の結晶について［１００］方
位を調べ、線軸方向との角度を調査した。その結果を表
１に示す。Embodiments of the present invention will be described below. SUS304 steel (weight%, C: 0.07%, Ni: 8.3%, Cr: 18.2%) was hot-rolled into a wire with a diameter of 5.5 mm, and then (a) a magnetic field of 1.5 Tesla was applied in the wire axis direction. While (b) applying a magnetic field of 0.3 Tesla in the direction of the wire axis, (c) without a magnetic field, wire drawing was performed to obtain a steel wire with a wire diameter of 1.8 mm. This was subjected to measurement of the amount of martensite by X-ray, measurement of the degree of integration in the [100] direction by electron diffraction, and measurement of the rigidity. For the measurement of the degree of integration, the [100] orientation was investigated for 30 crystals of the martensite phase, and the angle with the line axis direction was investigated. Table 1 shows the results.
【０００８】[0008]
【表１】 [Table 1]
【０００９】同表に示すように、１．５テスラの磁場を
線軸方向に印加した場合には、マルテンサイト相量が増
加し、［１００］方位が線軸方向と３０°以内の範囲に
あるマルテンサイト相の結晶が５０％以上あり、比較例
に比べて剛性率が高い。As shown in the table, when a magnetic field of 1.5 Tesla is applied in the linear axis direction, the amount of martensite phase increases and the [100] orientation is within the range of 30 ° with the linear axis direction. The site phase crystals are 50% or more, and the rigidity is higher than that of the comparative example.
【００２０】[0020]
【発明の効果】以上説明したように、本発明によれば、
マルテンサイト変態を効率的に起こしてマルテンサイト
量を増加させることができる。また、磁場の向きを限定
することによりマルテンサイト相の結晶方位を制御でき
る。これにより、ばね用鋼線の強度および剛性率を向上
できる。As described above, according to the present invention,
The amount of martensite can be increased by efficiently causing martensitic transformation. Further, the crystal orientation of the martensite phase can be controlled by limiting the direction of the magnetic field. As a result, the strength and rigidity of the spring steel wire can be improved.
Claims (2)
用鋼線において、５０％以上のマルテンサイト相の［１
００］方位が線軸方向に対して３０°以内の範囲に配向
していることを特徴とするばね用鋼線。1. A spring steel wire for obtaining a work-induced martensite structure, comprising [1] of martensite phase of 50% or more.
[00] is oriented within a range of 30 ° with respect to the direction of the wire axis.
軸方向に０．５テスラ以上の磁場を印加することを特徴
とするばね用鋼線の製造方法。2. A method for manufacturing a steel wire for spring, which comprises applying a magnetic field of 0.5 Tesla or more in the direction of the wire axis when drawing the steel wire for spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35296095A JPH09182911A (en) | 1995-12-28 | 1995-12-28 | Steel wire for spring and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35296095A JPH09182911A (en) | 1995-12-28 | 1995-12-28 | Steel wire for spring and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09182911A true JPH09182911A (en) | 1997-07-15 |
Family
ID=18427636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35296095A Pending JPH09182911A (en) | 1995-12-28 | 1995-12-28 | Steel wire for spring and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09182911A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009228122A (en) * | 2008-03-25 | 2009-10-08 | Nippon Steel Corp | Method for controlling quality of steel material |
| CN105579595A (en) * | 2013-10-11 | 2016-05-11 | 贝卡尔特公司 | High tensile strength steel wire |
-
1995
- 1995-12-28 JP JP35296095A patent/JPH09182911A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009228122A (en) * | 2008-03-25 | 2009-10-08 | Nippon Steel Corp | Method for controlling quality of steel material |
| CN105579595A (en) * | 2013-10-11 | 2016-05-11 | 贝卡尔特公司 | High tensile strength steel wire |
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