JPH06330239A - High carbon steel wire rod excellent in wire drawability and wire stranding property - Google Patents
High carbon steel wire rod excellent in wire drawability and wire stranding propertyInfo
- Publication number
- JPH06330239A JPH06330239A JP11872493A JP11872493A JPH06330239A JP H06330239 A JPH06330239 A JP H06330239A JP 11872493 A JP11872493 A JP 11872493A JP 11872493 A JP11872493 A JP 11872493A JP H06330239 A JPH06330239 A JP H06330239A
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- Prior art keywords
- wire
- carbon steel
- inclusions
- high carbon
- wire rod
- 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.)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、橋梁用ロープ、ホース
ワイヤー、ベルトコードおよびタイヤコード等の素材と
して、更には弁ばね等の素材として用いられる高炭素鋼
線材に関するものであり、特に伸線性および伸線後の撚
線性を改善すると共に、製品化した後の疲労特性にも優
れた高炭素鋼線材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high carbon steel wire rod used as a material for bridge ropes, hose wires, belt cords, tire cords and the like, and further as a material for valve springs and the like. The present invention also relates to a high carbon steel wire rod which has improved twistability after wire drawing and excellent fatigue properties after being commercialized.
【０００２】[0002]
【従来の技術】高炭素鋼線材は、伸線加工された後に、
撚線加工によって複数本撚り合わせてコード等に成形さ
れたり、ばね等の成形加工を受けるのが一般的である。
これらの加工において、伸線性や撚線性に悪影響を与え
るものとして、酸化物系非金属介在物が知られている。
また酸化物系非金属介在物は、製品化した後の線材の疲
労特性を低下させることも知られている。酸化物系非金
属介在物のうち、とりわけＡｌ2 Ｏ3 ，ＳｉＯ2 ，Ｃａ
ＯおよびＴｉＯ2 等の単組成の介在物は、硬度も高く非
延性であって、上記各特性に直接的に悪影響を及ぼすも
のである。2. Description of the Related Art High carbon steel wire rods are drawn after wire drawing.
Generally, a plurality of strands are twisted together to form a cord or the like, or a spring or the like is formed.
Oxide-based nonmetallic inclusions are known to adversely affect the wire drawability and twistability in these processes.
It is also known that oxide-based non-metallic inclusions reduce the fatigue properties of wire rods after they are commercialized. Among oxide-based non-metallic inclusions, especially Al 2 O 3 , SiO 2 , Ca
Inclusions having a single composition such as O and TiO 2 have high hardness and are non-ductile, and directly adversely affect the above-mentioned properties.
【０００３】こうしたことから、伸線性や撚線性、更に
は疲労特性に優れた高炭素鋼線材を製造するには、鋼の
洗浄度を高めると共に、酸化物系非金属介在物を軟質化
する必要があると言われている。Therefore, in order to produce a high carbon steel wire having excellent wire drawability, twistability, and fatigue properties, it is necessary to enhance the cleanliness of the steel and soften the oxide-based nonmetallic inclusions. It is said that there is.
【０００４】鋼の洗浄度を高めると共に酸化物系非金属
介在物を軟質化する為の技術として、例えば特開昭５５
−２４９６１号公報等に開示された技術が提案されてい
る。この技術は、溶鋼中のＡｌ量を低減して、Ａｌ2 Ｏ
3 系非金属介在物の組成制御を行なうものであるが、十
分な効果が得られるとは言い難かった。As a technique for enhancing the cleanliness of steel and softening oxide-based non-metallic inclusions, for example, Japanese Patent Laid-Open No.
The technology disclosed in Japanese Patent Publication No. 24961 is proposed. This technique is to reduce the amount of Al in the molten steel, Al 2 O
Although it is intended to control the composition of the 3 type non-metallic inclusions, it is difficult to say that sufficient effects can be obtained.
【０００５】一方、特公昭５７−３５２４３号公報にお
いては、Ａｌ規制下で取鍋内にキャリアーガス（不活性
ガス）と共にＣａＯフラックスを吹込み、予備脱酸した
後、Ｃａ，ＭｇおよびＲＥＭよりなる群から選ばれる１
種以上を含有する合金を吹込むことによって非金属介在
物を軟質化する技術が提案されている。また特公平４−
８４９９号公報には、非金属介在物インデックスを規定
し、且つ非金属介在物の組成をも規定することによっ
て、非金属介在物の軟質化を図り、これによって伸線性
や疲労特性を改善する技術が提案されている。しかしな
がら、これらの技術においては、ＳｉＯ2 −Ａｌ2 Ｏ3
−ＭｎＯ−ＣａＯ系の介在物について、組成を軟質な介
在物に改質することができても、その制御は非常に困難
を極めるばかりか、特に硬質で有害なＴｉ系介在物につ
いては全く低減できず、それほどの効果が発揮されてい
なかった。On the other hand, in Japanese Examined Patent Publication No. 57-35243, a CaO flux is blown into a ladle together with a carrier gas (inert gas) under Al regulation to pre-deoxidize, and then Ca, Mg and REM are used. 1 selected from the group
Techniques have been proposed for softening non-metallic inclusions by blowing an alloy containing at least one species. In addition,
Japanese Patent No. 8499 discloses a technique for softening nonmetallic inclusions by defining the index of nonmetallic inclusions and also defining the composition of the nonmetallic inclusions, thereby improving wire drawability and fatigue properties. Is proposed. However, in these techniques, SiO 2 —Al 2 O 3
Even if the composition of -MnO-CaO-based inclusions can be modified to soft inclusions, the control is extremely difficult, and particularly hard and harmful Ti-based inclusions are completely reduced. I couldn't do it and wasn't very effective.
【０００６】[0006]
【発明が解決しようとする課題】本発明はこうした状況
のもとになされたものであって、その目的は、硬質な酸
化物系非金属介在物の軟質化および低減を図ることによ
って、伸線性および撚線性を改善すると共に、疲労特性
にも優れた高炭素鋼線材を提供することにある。SUMMARY OF THE INVENTION The present invention has been made under these circumstances, and its purpose is to soften and reduce hard oxide-based non-metallic inclusions to thereby improve wire drawability. Another object of the present invention is to provide a high carbon steel wire rod having improved fatigue properties as well as improved twistability.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成し得た本
発明とは、Ｃ：０．６〜１．１％，Ｓｉ：０．１〜１．
５％，Ｍｎ：０．２〜１％，Ｐ：０．０２５％以下，
Ｓ：０．０２５％以下，Ａｌ：０．００３％以下を夫々
含有すると共に、下記(I) 〜(III) の要件を満足し、残
部鉄および不可避不純物からなる点に要旨を有する高炭
素鋼線材である。The present invention capable of achieving the above-mentioned object means that C: 0.6 to 1.1%, Si: 0.1 to 1.
5%, Mn: 0.2 to 1%, P: 0.025% or less,
A high-carbon steel containing S: 0.025% or less and Al: 0.003% or less, satisfying the following requirements (I) to (III), and having a balance of iron and inevitable impurities. It is a wire rod.
【０００８】(I) 全酸素量が１０〜３０ｐｐｍである。 (II)厚さ５μｍ以上の非金属介在物の平均組成の指数値
である（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）が０．２〜０．６であ
る。 (III) Ｔｉ含有量が、Ｔｉ（ｐｐｍ）≦１２／［Ｓｉ
（％）＋０．４］の関係を満足する。(I) The total oxygen content is 10 to 30 ppm. (II) The index value (Al 2 O 3 / SiO 2 ) of the average composition of nonmetallic inclusions having a thickness of 5 μm or more is 0.2 to 0.6. (III) Ti content is Ti (ppm) ≦ 12 / [Si
(%) + 0.4] is satisfied.
【０００９】[0009]
【構成および作用】酸化物系非金属介在物の可塑性につ
いては、単組成若しくは特定の酸化物が著しく高含有量
となる場合には、硬質となって可塑性が劣ることは知ら
れている。本発明者らはこうした知見に基づき、高炭素
鋼線材の伸線性および撚線性を改善する手段について、
様々な角度から検討を重ねた。その結果、特定の化学成
分組成を有する高炭素鋼線材において、該線材中の全酸
素量を所定の範囲に規定すると共に、厚さ５μｍ以上の
非金属介在物の平均組成の指数値となるＡｌ2 Ｏ3 量と
ＳｉＯ2 量の比（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）を所定の範囲
に規制することによって、Ａｌ2 Ｏ3 −ＳｉＯ2 よりな
る非金属介在物を軟質化できること、および鋼中のＳｉ
量に合わせたＴｉ含有量の制御を行なうことによって、
Ｔｉ系介在物を大幅に低減できることを見出し、更にこ
れらをバランス良く達成することによって伸線加工性お
よび撚線性を大きく改善でき、しかも疲労特性をも向上
できることを見出し、本発明を完成した。まず本発明に
おいて対象とする線材の化学成分限定理由は下記の通り
である。[Structure and action] Regarding the plasticity of the oxide-based non-metallic inclusions, it is known that when the single composition or the content of a specific oxide becomes extremely high, the material becomes hard and the plasticity is inferior. Based on these findings, the present inventors have proposed means for improving the drawability and twistability of high carbon steel wire rods.
I repeated the study from various angles. As a result, in a high carbon steel wire rod having a specific chemical composition, the total oxygen content in the wire rod is regulated within a predetermined range, and the Al value becomes an index value of the average composition of non-metallic inclusions having a thickness of 5 μm or more. By controlling the ratio of the amount of 2 O 3 and the amount of SiO 2 (Al 2 O 3 / SiO 2 ) within a predetermined range, it is possible to soften the non-metallic inclusions made of Al 2 O 3 —SiO 2 and Si
By controlling the Ti content according to the amount,
The inventors have found that Ti-based inclusions can be significantly reduced, and have found that by achieving these in a well-balanced manner, wire drawing workability and twistability can be greatly improved, and fatigue characteristics can also be improved, and the present invention has been completed. First, the reasons for limiting the chemical composition of the wire rod in the present invention are as follows.
【００１０】Ｃ：０．６〜１．１％ 加工後の強度を確保するという観点から、Ｃ含有量の下
限値はピアノ線の下限値である０．６％とした。一方、
Ｃ含有量は多くすればするほど高強度が達成されるが、
その反面高炭素化は線材の脆化を招く。特にＣの含有量
が１．１％を超えると、旧オーステナイト粒界にセメン
タイトの析出が多くなって却って伸線加工性を阻害する
ので、その上限は１．１％とした。C: 0.6 to 1.1% From the viewpoint of ensuring the strength after processing, the lower limit of the C content is set to 0.6% which is the lower limit of the piano wire. on the other hand,
The higher the C content, the higher the strength achieved, but
On the other hand, high carbon content causes brittleness of the wire. In particular, when the content of C exceeds 1.1%, the precipitation of cementite in the old austenite grain boundaries increases and the wire drawing workability is rather impaired. Therefore, the upper limit was made 1.1%.
【００１１】Ｓｉ：０．１〜１．５％ Ｓｉは、マトリックスの強化を図り、また脱酸に有効な
元素であり、その効果を発揮させる為には０．１％以上
添加する必要がある。しかしながら、Ｓｉが過剰に添加
されると、ＳｉＯ2 系の非金属介在物が生成し、伸線性
と撚線性が悪化し、断線回数が増加すると共に、脱炭層
の生成が著しくなって疲労特性が低下するので、Ｓｉの
添加量は１．５％以下とする必要がある。Si: 0.1 to 1.5% Si is an element effective for strengthening the matrix and deoxidizing, and it is necessary to add 0.1% or more in order to exert its effect. . However, if Si is excessively added, non-metallic inclusions of a SiO 2 system are generated, wire drawability and twistability are deteriorated, the number of wire breaks is increased, and a decarburized layer is remarkably formed, resulting in fatigue characteristics. Therefore, the amount of Si added must be 1.5% or less.
【００１２】Ｍｎ：０．２〜１％ ＭｎはＳｉと同様に脱酸元素として有効に作用するだけ
でなく、鋼中のＳをＭｎＳとして固定する作用を有して
おり、鋼中に固溶しているＳによる鋼線材の靭性劣化を
防止する効果がある。これらの効果を発揮させるために
は、０．２％以上添加する必要がある。一方、Ｍｎは鋼
の焼入性を増大させるので、１％を超えて過剰に含有さ
せるとマルテンサイトが発生し、伸線性を著しく低下さ
せ曲線を発生させる。Mn: 0.2 to 1% Mn not only acts effectively as a deoxidizing element like Si, but also acts to fix S in steel as MnS, and forms a solid solution in steel. It has an effect of preventing deterioration of toughness of the steel wire rod due to S. In order to exert these effects, it is necessary to add 0.2% or more. On the other hand, Mn increases the hardenability of steel, so if it is excessively contained in excess of 1%, martensite is generated, and the wire drawability is remarkably lowered to generate a curve.
【００１３】Ｐ：０．０２５％以下，Ｓ：０．０２５％
以下 ＰとＳは共に鋼の靭延性を低下させる元素であり、また
偏析し易い元素であり、どちらも０．０２５％以下に規
制する必要がある。 Ａｌ；０．００３％以下 Ａｌは過剰に含有させると、Ａｌ2 Ｏ3 やＭｇＯ−Ａｌ
2 Ｏ3 等の非金属介在物が多量に生成し、湿式伸線工程
や撚線工程での断線原因となる。従って、Ａｌの添加量
は可能な限り少なくするのが良く、少なくとも０．００
３％以下にする必要がある。P: 0.025% or less, S: 0.025%
Hereinafter, P and S are both elements that reduce the toughness and ductility of steel and are elements that easily segregate, and both must be restricted to 0.025% or less. Al: 0.003% or less When Al is excessively contained, Al 2 O 3 or MgO-Al
A large amount of non-metallic inclusions such as 2 O 3 is generated, which causes disconnection in the wet drawing process and the twisting process. Therefore, the addition amount of Al should be as small as possible, and should be at least 0.00
It should be 3% or less.
【００１４】本発明の高炭素鋼線材は、以上の元素を基
本成分とすると共に、後に詳述する(I) 〜(III) の要件
を満足し、残部鉄および不可避不純物からなるものであ
るが、必要に応じてＮｉ，Ｃｏ，Ｃｕ，Ｃｒ，Ｖ等を含
有するものであってもよい。これらの元素を含有させる
ときの、作用および適切な含有量は下記の通りである。The high carbon steel wire rod of the present invention has the above-mentioned elements as basic components, satisfies the requirements (I) to (III) described in detail later, and the balance iron and unavoidable impurities. If necessary, it may contain Ni, Co, Cu, Cr, V or the like. The action and appropriate content when these elements are contained are as follows.
【００１５】Ｎｉ：０．０５〜１．５％ Ｎｉは、ＣやＮによる時効硬化を遅らせて靭延性の低下
を防ぐと共に、絞り性の改善にも有効な元素である。こ
れらの効果を発揮させるためには、０．０５％以上添加
する必要がある。しかしながら、１．５％を超えて過剰
に添加すると、焼入性が上がり、マルテンサイトが発生
し易くなって、伸線性が低下する。Ni: 0.05 to 1.5% Ni is an element which delays age hardening due to C and N to prevent deterioration of toughness and ductility, and is also effective for improving drawability. In order to exert these effects, it is necessary to add 0.05% or more. However, if added in excess of 1.5%, the hardenability increases, martensite easily occurs, and the wire drawability decreases.
【００１６】Ｃｏ：０．０５〜１％ Ｃｏは初析セメンタイトの析出防止およびパーライト組
織を微細化して鋼の強度を高めるのに有効である。この
ような効果を発揮させるには０．０５％以上添加する必
要があるが、１％を超えて添加しても効果は飽和する。Co: 0.05 to 1% Co is effective in preventing the precipitation of pro-eutectoid cementite and refining the pearlite structure to enhance the strength of steel. In order to exert such an effect, it is necessary to add 0.05% or more, but even if added in excess of 1%, the effect is saturated.
【００１７】Ｃｕ：０．０５〜１％ Ｃｕは耐食性の向上と微細析出物の析出硬化による高強
度化に有効な元素であり、そのためには０．０５％以上
添加する必要がある。しかしながら、過剰に添加すると
却って延性を損なうので１％以下にする必要がある。Cu: 0.05 to 1% Cu is an element effective for improving corrosion resistance and strengthening by precipitation hardening of fine precipitates, and for this purpose, 0.05% or more must be added. However, if added excessively, the ductility is impaired, so it is necessary to make it 1% or less.
【００１８】Ｃｒ：０．０５〜１％ Ｃｒはパーライトラメラー間隔を小さくして、圧延後ま
たは熱処理後の強度を上昇させる。また伸線加工等にお
ける加工硬化率を高める作用を有するので、Ｃｒの添加
によって比較的低い加工率でも高強度を得ることができ
る。これらの作用を発揮させるには０．０５％以上添加
する必要があるが、過剰に添加するとパーライト変態に
対する焼入性が高くなりパテンティング処理が困難にな
り、さらに２次スケールが緻密になり過ぎ、メカニカル
デスケーリング性や酸洗性が劣化することから、１％以
下にする必要がある。Cr: 0.05 to 1% Cr reduces the pearlite lamellar spacing and increases the strength after rolling or heat treatment. Further, since it has the effect of increasing the work hardening rate in wire drawing and the like, addition of Cr makes it possible to obtain high strength even at a relatively low work rate. In order to exert these effects, it is necessary to add 0.05% or more, but if added excessively, the hardenability against pearlite transformation becomes high, the patenting process becomes difficult, and the secondary scale becomes too dense. However, the mechanical descaling property and the pickling property are deteriorated, so it is necessary to set it to 1% or less.
【００１９】Ｖ：０．０５〜１％ Ｖは焼入性向上元素であると同時に炭窒化物生成元素で
あり、鋼の強度向上に有効である。このような作用を発
揮させるためには、０．０５％以上添加する必要がある
が、過剰に添加するとマルテンサイトやベーナイト組織
が発生し、加工性が悪くなるので１％以下とする必要が
ある。V: 0.05 to 1% V is an element for improving hardenability and an element for forming carbonitrides, and is effective for improving the strength of steel. In order to exert such an action, it is necessary to add 0.05% or more, but if added excessively, martensite or bainite structure is generated and workability deteriorates, so it is necessary to add 1% or less. .
【００２０】次に、前記(I) 〜(III) の要件について説
明する。まず(I) の要件は、鋼中の全酸素量を１０〜３
０ｐｐｍと規定したものである。全酸素量が高くなる
と、凝固時にブローホールが発生し易くなってそれが表
面疵になったり、硬質の酸化物系非金属介在物量が多く
なるので、３０ｐｐｍ以下とする必要がある。Next, the requirements (I) to (III) will be described. First, the requirement of (I) is that the total oxygen content in steel is 10 to 3
It is defined as 0 ppm. If the total oxygen amount becomes high, blowholes are likely to be generated during solidification, which will result in surface flaws and the amount of hard oxide-based non-metallic inclusions will increase, so it is necessary to set it to 30 ppm or less.
【００２１】一方、全酸素量を１０ｐｐｍ未満まで脱酸
するには、一般的にＡｌやＭｇ等の強力な脱酸材が必要
となり、これらを使用した場合にはＡｌやＭｇは酸化物
となって硬質の非金属介在物として鋼中に残り、伸線性
や撚線性を低下させる。従って、全酸素量の下限は１０
ｐｐｍとした。ちなみに図１は、全酸素量と介在物指数
の関係を示すグラフであるが、全酸素量が１０〜３０ｐ
ｐｍで介在物が少なくなっていることがわかる。On the other hand, in order to deoxidize the total oxygen content to less than 10 ppm, a strong deoxidizing material such as Al or Mg is generally required. When these are used, Al or Mg becomes an oxide. And remains in the steel as hard non-metallic inclusions, reducing the drawability and twistability. Therefore, the lower limit of total oxygen is 10
It was defined as ppm. By the way, FIG. 1 is a graph showing the relationship between the total oxygen content and the inclusion index.
It can be seen that inclusions are reduced in pm.
【００２２】(II)の要件は、厚さ５μｍ以上の非金属介
在物の平均組成の指数値である（Ａｌ2 Ｏ3 ／ＳｉＯ
2 ）が０．２〜０．６と規定したものである。本発明者
らが、線材中に酸化物非金属介在物として認められる介
在物の組成と、伸線性および撚線性並びに疲労特性との
関係について調査したところ、非金属介在物がＳｉＯ2
−Ａｌ2 Ｏ3 −ＣａＯ−ＭｎＯ系の場合には、主にＳｉ
Ｏ2 とＡｌ2 Ｏ3 のバランス（即ちＡｌ2 Ｏ3 ／ＳｉＯ
2 ）が特定範囲内に入っていれば、酸化物系非金属介在
物は軟質な延性介在物になることが判明した。尚、非金
属介在物の厚さを５μｍ以上としたのは、厚さ５μｍ以
上の非金属介在物が伸線性、撚線性および疲労特性等に
直接的な影響を及ぼすからである。The requirement (II) is an index value of the average composition of nonmetallic inclusions having a thickness of 5 μm or more (Al 2 O 3 / SiO 2).
2 ) is specified as 0.2 to 0.6. The present inventors investigated the relationship between the composition of inclusions recognized as oxide non-metal inclusions in the wire and the wire drawability, twistability, and fatigue properties, and found that the non-metal inclusions contained SiO 2
In the case of -Al 2 O 3 -CaO-MnO system, Si is mainly used.
Balance of O 2 and Al 2 O 3 (ie Al 2 O 3 / SiO 2
It was found that oxide-based nonmetallic inclusions become soft ductile inclusions if 2 ) is within the specified range. The thickness of the non-metallic inclusions is set to 5 μm or more because the non-metal inclusions having a thickness of 5 μm or more directly affect the wire drawability, twistability and fatigue properties.
【００２３】介在物組成（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）と断
線指数（撚線時および伸線時）の関係を図２に、介在物
組成（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）と（Ｓ−Ｎ曲線）疲労特
性の関係を図３に夫々示す。これらの結果から明らかな
様に、（Ａｌ2 Ｏ3/ＳｉＯ2)が０．２〜０．６の範囲内
では、非常に良好な伸線性および撚線性が得られてお
り、また疲労特性も良好であることがわかる。The relationship between the composition of inclusions (Al 2 O 3 / SiO 2 ) and the disconnection index (during twisting and drawing) is shown in FIG. 2, and the composition of inclusions (Al 2 O 3 / SiO 2 ) and (S- FIG. 3 shows the relationship between the fatigue characteristics (N curve). As is clear from these results, when (Al 2 O 3 / SiO 2 ) is in the range of 0.2 to 0.6, very good wire drawability and twistability are obtained, and fatigue characteristics are also obtained. It turns out that it is good.
【００２４】次に(III) の要件は、「Ｔｉ含有量が、Ｔ
ｉ（ｐｐｍ）≦１２／［Ｓｉ（％）＋０．４］の関係を
満足する」と規定したものである。酸化物系非金属介在
物のうち、Ａｌ2 Ｏ3 ，ＳｉＯ2 ，ＣａＯ，ＴｉＯ2 の
各単組成の介在物は硬度も高く非粘性であることは、上
述した通りである。このうちＡｌ2 Ｏ3 ，ＳｉＯ2 ，Ｃ
ａＯ等の介在物については、上記の如く全酸素量を規定
することと、（Ａｌ2Ｏ3 ／ＳｉＯ2 ）の値のバランス
を図ることによって、Ａｌ2 Ｏ3 −ＳｉＯ2 −ＣａＯ−
ＭｎＯ系内の介在物として軟質化することが可能である
が、ＴｉＯ2 系介在物についてはＡｌ2 Ｏ3 −ＳｉＯ2
系の複合の介在物にすることによって軟質化させること
は非常に困難である。この為、Ｔｉ系介在物はＴｉＯ2
単体として存在し、断線の原因となる。また本発明者ら
が研究したところによると、Ｔｉ系介在物は従来のＡｌ
2 Ｏ3 系やＳｉＯ2 系の介在物に比べて小さな大きさ
で、伸線性や撚線性に悪影響を及ぼすことを見出した。Next, the requirement of (III) is that "Ti content is T
i (ppm) ≦ 12 / [Si (%) + 0.4] is satisfied ”. As described above, among oxide-based non-metallic inclusions, inclusions having a single composition of Al 2 O 3 , SiO 2 , CaO, and TiO 2 have high hardness and are non-viscous. Of these, Al 2 O 3 , SiO 2 , C
Regarding inclusions such as aO, by defining the total oxygen content as described above and balancing the value of (Al 2 O 3 / SiO 2 ), Al 2 O 3 —SiO 2 —CaO—
Although it can be softened as an inclusion in the MnO-based inclusion, Al 2 O 3 -SiO 2 is added to the TiO 2 -based inclusion.
It is very difficult to soften by making it a complex inclusion of the system. Therefore, the Ti-based inclusions are TiO 2
It exists as a simple substance and causes disconnection. According to the research conducted by the present inventors, Ti-based inclusions are
It has been found that the size is smaller than that of 2 O 3 -based or SiO 2 -based inclusions, which adversely affects wire drawability and twistability.
【００２５】図４は、各介在物（Ａｌ2 Ｏ3 系およびＴ
ｉＯ2 系）における破面介在物平均大きさ指数が伸線加
工性（伸線加工時の断線指数）に与える影響を示したグ
ラフである。図４から明らかな様にＴｉ系介在物はＡｌ
2 Ｏ3 系介在物に比べて約半分の大きさであるにもかか
わらず、同じ程度に断線が発生していることがわかる。FIG. 4 shows the inclusions (Al 2 O 3 system and T
3 is a graph showing the influence of the average size index of fracture surface inclusions in (iO 2 system) on wire drawability (wire breakage index during wire drawing). As is clear from FIG. 4, Ti-based inclusions are Al
It can be seen that although the size is about half that of the 2 O 3 inclusions, the wire breakage occurs to the same extent.
【００２６】そこで本発明者らが、Ｔｉ系介在物を低減
するという観点から、成分の異なる種々の鋼線材で実験
を行なった。その結果、Ｔｉ系介在物の発生は鋼中に含
まれているＴｉ量とＳｉ量で関係づけられることを見出
した。即ち、図５はＳｉ含有量およびＴｉ含有量がＴｉ
系介在物による断線に与える影響を示すグラフである
が、Ｓｉ含有量が多い場合はＴｉ含有量が少なくてもＴ
ｉ系介在物が発生し、伸線時や撚線時に断線が発生し易
いことが判明した。Therefore, the present inventors have conducted experiments with various steel wire rods having different components from the viewpoint of reducing Ti-based inclusions. As a result, they have found that the generation of Ti-based inclusions is related to the Ti content and Si content contained in the steel. That is, FIG. 5 shows that the Si content and the Ti content are Ti.
It is a graph showing the influence of the system inclusions on the wire breakage. When the Si content is high, the T content is low even if the Ti content is low.
It was found that i-type inclusions were generated, and that wire breakage was likely to occur during wire drawing and twisting.
【００２７】尚図６はＳｉ含有量が０．２％のときにＴ
ｉ含有量が疲労特性に与える影響を示すグラフ（Ｓ−Ｎ
曲線）であるが、この結果はＴｉ含有量をＳｉ含有量と
の関係で規定することによって伸線性や撚線性をより良
好にできることを示すものである。Incidentally, FIG. 6 shows T when the Si content is 0.2%.
Graph showing the effect of i content on fatigue properties (S-N
Curve), the results show that the wire drawability and twistability can be improved by defining the Ti content in relation to the Si content.
【００２８】これらの結果から、本発明者らは更に検討
を重ねたところ、Ｔｉ含有量をＴｉ（ｐｐｍ）≦１２／
［Ｓｉ（％）＋０．４］となる様に規定すれば、Ｔｉ系
介在物による伸線性および撚線性を極めて良好にできる
ことがわかった。From these results, the present inventors have made further studies and found that the Ti content is Ti (ppm) ≦ 12 /
It has been found that the wire drawing property and the twisting property due to the Ti-based inclusions can be made extremely excellent if the content is specified to be [Si (%) + 0.4].
【００２９】[0029]
【発明の効果】本発明は以上の様に構成されており、本
発明の高炭素鋼線材は硬質の酸化物系非金属介在物が少
なくなって伸線性が良好となるので、高速での伸線が可
能となり、加工の厳しい極線線用素材として最適であ
る。またＡｌ2 Ｏ3 −ＳｉＯ2 系の介在物は軟質化され
ており、且つＴｉＯ2 等の硬質な介在物も少なくなって
いるので、伸線時や撚線時の介在物に起因する断線が非
常に少なくなり、従来の線材に比べこれらの特性が著し
く向上したものとなる。そして断線が少なくなること
は、生産性を大幅に向上するという利益も得られる。更
に、本発明の高炭素鋼線材は、硬質の酸化物系非金属介
在物が少なくなることによって疲労特性にも優れたもの
となり、各種ワイヤー、スチールコード、弁ばね等の素
材として最適である。EFFECTS OF THE INVENTION The present invention is constituted as described above, and the high carbon steel wire rod of the present invention has less hard oxide non-metallic inclusions and has good wire drawability. Since it is possible to draw a wire, it is most suitable as a material for polar wire that is difficult to process. In addition, since Al 2 O 3 -SiO 2 -based inclusions are softened and hard inclusions such as TiO 2 are reduced, disconnection due to inclusions during wire drawing or twisting is avoided. This is a very small number, and these characteristics are remarkably improved as compared with the conventional wire. And the reduction of disconnection also has the benefit of significantly improving productivity. Further, the high carbon steel wire rod of the present invention has excellent fatigue characteristics due to the reduction of hard oxide non-metallic inclusions, and is optimal as a material for various wires, steel cords, valve springs and the like.
【図１】全酸素量と介在物指数の関係を示すグラフであ
る。FIG. 1 is a graph showing the relationship between total oxygen content and inclusion index.
【図２】介在物組成（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）と断線指
数（撚線時および伸線時）の関係を示すグラフである。FIG. 2 is a graph showing the relationship between the composition of inclusions (Al 2 O 3 / SiO 2 ) and the breaking index (during twisting and drawing).
【図３】介在物組成（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）と疲労特
性の関係を示すグラフである。FIG. 3 is a graph showing a relationship between inclusion composition (Al 2 O 3 / SiO 2 ) and fatigue characteristics.
【図４】Ａｌ2 Ｏ3 系およびＴｉＯ2 系の各介在物にお
ける破面介在物平均大きさ指数が伸線加工性に与える影
響を示すグラフである。FIG. 4 is a graph showing the influence of the average size index of fracture surface inclusions on Al 2 O 3 and TiO 2 inclusions on wire drawing workability.
【図５】Ｓｉ含有量およびＴｉ含有量がＴｉ系介在物に
よる断線に与える影響を示すグラフである。FIG. 5 is a graph showing the influence of Si content and Ti content on disconnection due to Ti-based inclusions.
【図６】Ｓｉが０．２％のときにＴｉ含有量が疲労特性
に与える影響を示すグラフである。FIG. 6 is a graph showing the effect of Ti content on fatigue properties when Si is 0.2%.
Claims (6)
以下同じ），Ｓｉ：０．１〜１．５％，Ｍｎ：０．２〜
１％，Ｐ：０．０２５％以下，Ｓ：０．０２５％以下，
Ａｌ：０．００３％以下を夫々含有すると共に、下記
(I) 〜(III) の要件を満足し、残部鉄および不可避不純
物からなることを特徴とする伸線性および撚線性に優れ
た高炭素鋼線材。 (I) 全酸素量が１０〜３０ｐｐｍである。 (II)厚さ５μｍ以上の非金属介在物の平均組成の指数値
である（Ａｌ2 Ｏ3 ／ＳｉＯ2 ）が０．２〜０．６であ
る。 (III) Ｔｉ含有量が、Ｔｉ（ｐｐｍ）≦１２／［Ｓｉ
（％）＋０．４］の関係を満足する。1. C: 0.6 to 1.1% (meaning% by weight,
The same shall apply hereinafter), Si: 0.1 to 1.5%, Mn: 0.2 to
1%, P: 0.025% or less, S: 0.025% or less,
Al: 0.003% or less, respectively, and
A high carbon steel wire rod having excellent drawability and twistability, which satisfies the requirements (I) to (III) and is composed of the balance iron and inevitable impurities. (I) The total oxygen content is 10 to 30 ppm. (II) The index value (Al 2 O 3 / SiO 2 ) of the average composition of nonmetallic inclusions having a thickness of 5 μm or more is 0.2 to 0.6. (III) Ti content is Ti (ppm) ≦ 12 / [Si
(%) + 0.4] is satisfied.
するものである請求項１に記載の高炭素鋼線材。2. The high carbon steel wire rod according to claim 1, which further contains Ni: 0.05 to 1.5%.
ものである請求項１または２に記載の高炭素鋼線材。3. The high carbon steel wire rod according to claim 1, further comprising Co: 0.05 to 1%.
ものである請求項１〜３のいずれかに記載の高炭素鋼線
材。4. The high carbon steel wire rod according to claim 1, which further contains Cu: 0.05 to 1%.
ものである請求項１〜４のいずれかに記載の高炭素鋼線
材。5. The high carbon steel wire rod according to claim 1, further comprising Cr: 0.05 to 1%.
のである請求項１〜５のいずれかに記載の高炭素鋼線
材。6. The high carbon steel wire rod according to claim 1, which further contains V: 0.05 to 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11872493A JP2687839B2 (en) | 1993-05-20 | 1993-05-20 | High carbon steel wire rod with excellent wire drawability and twistability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11872493A JP2687839B2 (en) | 1993-05-20 | 1993-05-20 | High carbon steel wire rod with excellent wire drawability and twistability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06330239A true JPH06330239A (en) | 1994-11-29 |
| JP2687839B2 JP2687839B2 (en) | 1997-12-08 |
Family
ID=14743517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11872493A Expired - Lifetime JP2687839B2 (en) | 1993-05-20 | 1993-05-20 | High carbon steel wire rod with excellent wire drawability and twistability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2687839B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009119359A1 (en) * | 2008-03-25 | 2009-10-01 | 新日本製鐵株式会社 | Wire rod and high-strength steel wire excellent in ductility, and processes for production of both |
| US7850793B2 (en) | 2002-09-26 | 2010-12-14 | Kobe Steel, Ltd. | Hot milled wire rod excelling in wire drawability and enabling avoiding heat treatment before wire drawing |
| CN103122437A (en) * | 2011-11-18 | 2013-05-29 | 江苏省沙钢钢铁研究院有限公司 | Vanadium-silicon composite microalloyed ultrahigh-strength wire rod and preparation process thereof |
| WO2018117157A1 (en) | 2016-12-20 | 2018-06-28 | 新日鐵住金株式会社 | Wire rod |
-
1993
- 1993-05-20 JP JP11872493A patent/JP2687839B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7850793B2 (en) | 2002-09-26 | 2010-12-14 | Kobe Steel, Ltd. | Hot milled wire rod excelling in wire drawability and enabling avoiding heat treatment before wire drawing |
| WO2009119359A1 (en) * | 2008-03-25 | 2009-10-01 | 新日本製鐵株式会社 | Wire rod and high-strength steel wire excellent in ductility, and processes for production of both |
| JP5114684B2 (en) * | 2008-03-25 | 2013-01-09 | 新日鐵住金株式会社 | Wire material excellent in ductility, high-strength steel wire, and production method thereof |
| US9212410B2 (en) | 2008-03-25 | 2015-12-15 | Nippon Steel & Sumitomo Metal Corporation | Steel rod and high strength steel wire having superior ductility and methods of production of same |
| US9689053B2 (en) | 2008-03-25 | 2017-06-27 | Nippon Steel & Sumitomo Metal Corporation | Steel rod and high strength steel wire having superior ductility and methods of production of same |
| CN103122437A (en) * | 2011-11-18 | 2013-05-29 | 江苏省沙钢钢铁研究院有限公司 | Vanadium-silicon composite microalloyed ultrahigh-strength wire rod and preparation process thereof |
| WO2018117157A1 (en) | 2016-12-20 | 2018-06-28 | 新日鐵住金株式会社 | Wire rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2687839B2 (en) | 1997-12-08 |
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