JPH0971842A - High strength non-heat treated steel wire rod excellent in cold heading property - Google Patents
High strength non-heat treated steel wire rod excellent in cold heading propertyInfo
- Publication number
- JPH0971842A JPH0971842A JP22941295A JP22941295A JPH0971842A JP H0971842 A JPH0971842 A JP H0971842A JP 22941295 A JP22941295 A JP 22941295A JP 22941295 A JP22941295 A JP 22941295A JP H0971842 A JPH0971842 A JP H0971842A
- Authority
- JP
- Japan
- Prior art keywords
- deformation resistance
- steel wire
- wire rod
- tensile strength
- heat treated
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 32
- 239000010959 steel Substances 0.000 title claims abstract description 32
- 238000005491 wire drawing Methods 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- 238000010273 cold forging Methods 0.000 claims description 4
- 238000000137 annealing Methods 0.000 abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 abstract description 5
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000004513 sizing Methods 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 229910000975 Carbon steel Inorganic materials 0.000 abstract 1
- 239000010962 carbon steel Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 15
- 238000005482 strain hardening Methods 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 5
- 238000011282 treatment Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、球状化焼きなまし
プロセスを省略する非調質鋼でありながら、種々の冷間
加工における変形抵抗が少なく、従って該加工の為の工
具については、その寿命の低下を招かない様な鋼線材に
関するものである。本発明の鋼線材は、熱間圧延後、冷
間伸線加工を施したものであり、７００Ｎ／ｍｍ2 以
上、さらには１，０００Ｎ／ｍｍ2 級という高強度レベ
ルを発揮するものであっても、非調質のまま各種の冷間
加工に付されることを予定するものであるが、この冷間
加工における変形抵抗を低くすることを保証するもので
ある。なお本発明の鋼線材は、冷間伸線後の冷間加工の
種類及び冷間加工によって製造される成形品の種類を一
切制限するものではない。なお以下の説明においては、
本発明の鋼線材をボルト用鋼として用いる場合を代表的
に取り上げて説明するが、本発明の適用対象をこれに制
限解釈すべきではない。BACKGROUND OF THE INVENTION The present invention is a non-heat treated steel that omits the spheroidizing annealing process, but has a low deformation resistance in various cold workings. Therefore, the tool for the working has a long life. The present invention relates to a steel wire rod that does not deteriorate. The steel wire rod of the present invention has been subjected to cold wire drawing after hot rolling and exhibits a high strength level of 700 N / mm 2 or more, and further 1,000 N / mm 2 grade. Also, although it is planned to be subjected to various cold workings in the non-tempered state, it is guaranteed that the deformation resistance in this cold working is lowered. The steel wire rod of the present invention does not limit the types of cold working after cold drawing and the types of molded products manufactured by cold working. In the following description,
The case where the steel wire rod of the present invention is used as a steel for bolts will be representatively described, but the object to which the present invention is applied should not be limited to this.
【０００２】[0002]
【従来の技術】引張強度７００Ｎ／ｍｍ2 以上級の高強
度ボルトは、中炭素鋼あるいは低合金鋼からなる線材や
棒鋼を用いて製造するが、その際通常のプロセスでは、
熱間圧延線材を球状化焼きなまし処理に付した後、潤滑
皮膜処理を行い、更にサイジングの為の低減面率の冷間
伸線加工を行い、しかる後、冷間ボルト成形、ねじ転造
を経て、最後に焼入れ・焼戻し処理を行って所望の特性
に調整している。 2. Description of the Related Art High-strength bolts having a tensile strength of 700 N / mm 2 or higher are manufactured by using wire rods and bar steels made of medium carbon steel or low alloy steel.
After subjecting the hot-rolled wire rod to a spheroidizing annealing treatment, a lubricating film treatment is performed, and then cold wire drawing with a reduced surface ratio for sizing is performed, followed by cold bolt forming and thread rolling. Finally, quenching and tempering are performed to adjust to the desired characteristics.
【０００３】これに対し近年の傾向として、省エネルギ
ーあるいは生産コストダウンの要求が強まり、球状化焼
きなましや焼入れ・焼戻し処理の省略が企図され、いわ
ゆる非調質ボルトへの指向が強まっている。On the other hand, as a tendency in recent years, there is an increasing demand for energy saving or production cost reduction, and it is attempted to omit the spheroidizing annealing and the quenching / tempering treatments, and the so-called non-heat treated bolts are becoming stronger.
【０００４】このような非調質ボルトでは、ボルト成形
の前の鋼線の段階で、ボルトとして要求される所定の引
張強度を達成しておくことが必要であるため、従前の調
質ボルト製造プロセスにおける球状化焼きなまし材より
も引張強度において高いものを使用することになり、従
ってボルト成形時の冷間圧造性が悪くなり、その為非調
質ボルトの加工に際しては、従来の調質ボルトの冷間圧
造に比べて工具寿命が短くなるという問題があった。こ
の様なところから、非調質ボルトの製造における非調質
であることの経済効果を実のあるものとする為には、冷
間圧造性の改善が当面の課題となる。In such a non-heat treated bolt, since it is necessary to achieve a predetermined tensile strength required for the bolt at the stage of steel wire before the bolt is formed, the conventional heat treated bolt is manufactured. Since the one having higher tensile strength than the spheroidized annealed material in the process is used, the cold forgeability at the time of bolt forming is deteriorated, and therefore, when processing a non-heat treated bolt, a conventional heat treated bolt is used. There was a problem that the tool life was shorter than that of cold heading. From such a point, in order to realize the economic effect of the non-heat treated bolt in the production of the non-heat treated bolt, the improvement of the cold forgeability is an immediate problem.
【０００５】特公昭５４−２０９３１号では、Ｃを低下
させると共に、Ｎｂ，Ｖなどの析出強化型元素を添加す
ることが検討されているが、この技術では、冷間圧造時
の工具割れを防止することが主目的とされており、冷間
圧造における工具寿命の改善は特に意図されている訳で
はない。In Japanese Patent Publication No. 54-20931, it is considered to reduce C and add precipitation strengthening elements such as Nb and V, but this technique prevents tool cracking during cold heading. The main purpose is to improve the tool life in cold heading and is not specifically intended.
【０００６】一方特公平５−３０８８４号では、冷間伸
線の実施による所謂バウシンガー効果を最大限に引出す
という観点から、単なる伸線加工の付加に止まらず、鋼
の化学成分の調整、組織の調整、圧延後の制御冷却など
を総合的に組み合わせて実施することが提案されてい
る。この方法は変形抵抗の値そのものを低下させること
を念頭に置いたものであり、相応の効果を発揮するもの
であったが、全体的に見て複雑な制御を必要とするの
で、必ずしも汎用性に富んでいるとは言い難い。On the other hand, in Japanese Patent Publication No. 5-30884, from the viewpoint of maximizing the so-called Bauschinger effect by carrying out cold wire drawing, not only simple wire drawing work but also adjustment of chemical composition of steel and structure It has been proposed to carry out a comprehensive combination of the above-mentioned adjustment and controlled cooling after rolling. This method was intended to reduce the value of the deformation resistance itself, and had a corresponding effect, but it requires complicated control as a whole, so it is not always versatile. It is hard to say that it is rich in.
【０００７】[0007]
【発明が解決しようとする課題】本発明は上記の様な事
情を考慮してなされたものであって、球状化焼きなまし
を省略し、更に最後の焼入れ・焼戻し処理を省略する非
調質鋼であっても、上記の様な冷間成形時の変形抵抗を
十分に低下させることができる様な新規技術の開発を目
標にしてなされたものである。即ち従来の鋼線材では、
引張強度の要求が高くなるのに応じて焼き入れ性向上元
素を多く添加していたが、これによって変形抵抗の増大
を招いていたことに鑑み、７００Ｎ／ｍｍ2 以上級の高
引張強度を有する非調質鋼線材において、ボルト成形等
の冷間加工における変形抵抗を、その引張強度に見合っ
た十分に低いものとなる様な非調質鋼線材を提供しよう
とするものである。SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and is a non-heat treated steel in which spheroidizing annealing is omitted and further the final quenching / tempering treatment is omitted. Even so, it was made with the goal of developing a new technology capable of sufficiently reducing the deformation resistance during cold forming as described above. That is, in the conventional steel wire rod,
A large number of hardenability-improving elements were added as the demand for tensile strength became higher, but in view of the fact that this resulted in an increase in deformation resistance, it had a high tensile strength of 700 N / mm 2 or higher. It is an object of the present invention to provide a non-heat treated steel wire rod whose deformation resistance in cold working such as bolt forming is sufficiently low in proportion to its tensile strength.
【０００８】[0008]
【課題を解決するための手段】上記課題を達成すること
のできた本発明とは、 Ｃ ：０．１５〜０．３５質量％（質量％は以下単に％
と略記する） Ｓｉ：０．５％以下（０％を含まない） Ｍｎ：０．７０〜１．８０％ を満足し、且つ熱間圧延及び伸線加工を施すことによっ
て７００Ｎ／ｍｍ2 以上の引張強度を有する鋼線材であ
って、下記（１）式で求められる変形抵抗比が１．２以
下を示す冷間圧造性の優れた高強度非調質鋼線材であ
る。Means for Solving the Problems The present invention capable of achieving the above object means that C: 0.15 to 0.35% by mass (% by mass is simply referred to as% hereinafter).
Si: 0.5% or less (not including 0%) Mn: 0.70 to 1.80%, and 700 N / mm 2 or more by hot rolling and wire drawing. A steel wire rod having tensile strength, which is a high-strength non-heat treated steel wire rod having excellent cold forgeability and having a deformation resistance ratio of 1.2 or less obtained by the following formula (1).
【０００９】 ＦＳＲ＝σ／ＴＳ ・・・・・・・・（１） 但し σ：変形抵抗（Ｎ／ｍｍ2 ） ＴＳ：引張強度（Ｎ／ｍｍ2 ）FSR = σ / TS (1) where σ: Deformation resistance (N / mm 2 ) TS: Tensile strength (N / mm 2 )
【００１０】[0010]
【発明の実施の形態】上記構成からなる本発明の鋼線材
は、鋼の化学成分、及び上記（１）式で求められる変形
抵抗比によって規定したものであり、これら各要素の適
切な組合わせによって種々の形態で実施される。従って
以下これらの要素に関して夫々説明する。BEST MODE FOR CARRYING OUT THE INVENTION The steel wire rod of the present invention having the above-mentioned constitution is defined by the chemical composition of steel and the deformation resistance ratio obtained by the above formula (1), and an appropriate combination of these respective elements. Are carried out in various forms. Therefore, each of these elements will be described below.
【００１１】鋼線材の化学成分 まず本発明鋼線材を構成する化学成分について説明す
る。 Ｃ：０．１５〜０．３５％ Ｃは固溶強化によって鋼に所望の強度を与える上で必要
な元素であり、とくに伸線加工後の引張強度を７００Ｎ
／ｍｍ2 以上とする為には、既に知られている様に０．
１５％以上の添加が必要である。しかし０．３５％を超
えると、靭性が低下すると共に冷間加工時の変形抵抗を
増大させ、成形品の割れや工具寿命の低下を招く。Ｃの
より好ましい添加範囲は０．２０〜０．３０％である。 Chemical Composition of Steel Wire Rod First , the chemical composition of the steel wire rod of the present invention will be explained. C: 0.15 to 0.35% C is an element necessary for giving the desired strength to steel by solid solution strengthening, and particularly, the tensile strength after wire drawing is 700N.
/ Mm 2 or more, it is 0.
It is necessary to add 15% or more. However, if it exceeds 0.35%, the toughness is lowered and the deformation resistance at the time of cold working is increased, resulting in cracking of the molded product and shortening of the tool life. The more preferable addition range of C is 0.20 to 0.30%.
【００１２】Ｓｉ：０．５％以下（０％を含まない） Ｓｉは鋼中において脱酸作用を発揮すると共に、固溶強
化によって強度向上に寄与する元素であるが、既に知ら
れている様に好ましくは０．０１％以上の添加が望まれ
る。しかし０．５％を超えると、靭性が低下すると共に
冷間加工時の変形抵抗を増大させ、成形品の割れや工具
寿命の低下を招く。なお本発明者等の研究によれば、同
じく固溶強化型元素であるＣとＳｉを比べると、Ｓｉは
引張強度の同一上昇量に対する変形抵抗の増大量が大き
い元素であることが分かっており、Ｓｉの添加量は、よ
り好ましくは、０．３０％以下とすることが推奨され
る。Si: 0.5% or less (not including 0%) Si is an element that exerts a deoxidizing action in steel and contributes to the strength improvement by solid solution strengthening, but it is already known. In particular, it is desired to add 0.01% or more. However, if it exceeds 0.5%, the toughness decreases and the deformation resistance during cold working increases, which causes cracking of the molded product and shortening of the tool life. According to the research conducted by the present inventors, when C and Si, which are also solid-solution strengthening elements, are compared, it is known that Si has a large increase in deformation resistance with respect to the same increase in tensile strength. More preferably, the added amount of Si is set to 0.30% or less.
【００１３】Ｍｎ：０．７０〜１．８０％ Ｍｎは固溶強化元素であり、本発明では、Ｃによる固溶
強化作用を補充する。すなわち本発明では、Ｃの過剰添
加による変形抵抗の増大を避けることとしているので、
Ｃを前記の如く少なめの範囲に設定しており、これを補
足するという主旨から、既に知られている様に、少なく
とも０．７０％の添加を必須とするが、Ｍｎにおいても
過剰添加は靭性と変形抵抗の増大を招くので、１．８０
％を超えて添加させてはならない。より好ましい添加範
囲は０．７０〜１．７０％、更に好ましい範囲は０．８
０〜１．６０％である。Mn: 0.70 to 1.80% Mn is a solid solution strengthening element, and in the present invention, the solid solution strengthening action of C is supplemented. That is, in the present invention, since it is intended to avoid an increase in deformation resistance due to excessive addition of C,
As described above, C is set in a small range as described above, and it is indispensable to add at least 0.70% from the purpose of complementing this. Therefore, the deformation resistance increases, so 1.80
Do not add more than%. A more preferable addition range is 0.70 to 1.70%, and an even more preferable range is 0.8.
It is 0 to 1.60%.
【００１４】本発明鋼線材における必須元素は以上述べ
た通りであり、他の元素の添加については格別制限され
ない。例えば析出強化型の元素であるＶ，Ｎｂ，Ｔｉ等
を添加することもできるが、最も通常の元素構成によれ
ば、残部は実質的にＦｅ及び不可避的元素である。この
ような不可避的元素としては、Ｐ，Ｓ，Ｃｒ，Ｎ，Ｏ等
が挙げられる。以下これらの元素について説明する。The essential elements in the steel wire rod of the present invention are as described above, and the addition of other elements is not particularly limited. For example, precipitation-strengthening elements such as V, Nb, and Ti may be added, but according to the most common elemental structure, the balance is substantially Fe and unavoidable elements. Examples of such inevitable elements include P, S, Cr, N and O. These elements will be described below.
【００１５】Ｃｒ：０．２０％以下（０％を含む） Ｃｒは強度向上に寄与する元素であるが、０．２０％を
超えて存在すると冷間圧造時の変形抵抗が増大するの
で、０．２０％を上限と定めた。Cr: 0.20% or less (including 0%) Cr is an element that contributes to the improvement of strength, but if it is present in excess of 0.20%, the deformation resistance during cold forging increases, so 0 The upper limit was set to 20%.
【００１６】Ｎ ：０．００５％以下（０％を含む） Ｎが存在する場合は、後述のＶ，Ｎｂ，Ｔｉと結合して
析出強化作用を発揮するが、ここでは冷間圧造時の温度
上昇に伴うひずみ時効を抑制するという観点から上記値
を上限と定めた。N: 0.005% or less (including 0%) When N is present, it combines with V, Nb, and Ti, which will be described later, to exert a precipitation strengthening effect, but here, the temperature during cold heading is used. The above value was set as the upper limit from the viewpoint of suppressing the strain aging associated with the rise.
【００１７】Ｖ ：０．０５〜０．３０％ Ｖは析出硬化に寄与する元素であるが、その作用を有効
に発揮するには０．０５％以上の存在が望まれる。しか
し過剰に存在させても上記作用が飽和に達し、却って冷
間圧造時の変形抵抗を増大させるので、０．３０％以下
の添加に抑えることが望まれる。V: 0.05 to 0.30% V is an element that contributes to precipitation hardening, but it is desirable that V be present in an amount of 0.05% or more in order to exert its action effectively. However, even if it is excessively present, the above-mentioned action reaches saturation and rather the deformation resistance during cold forging increases, so it is desirable to suppress the addition to 0.30% or less.
【００１８】Ｎｂ：０．１％以下（０％を含む） Ｔｉ：０．０６％以下（０％を含む） 同じく析出強化型の元素であるが、Ｎｂについては０．
１％、Ｔｉについては０．０６％を超えても上記効果が
飽和に達するので、それぞれ上記値を上限と定めた。Nb: 0.1% or less (inclusive of 0%) Ti: 0.06% or less (inclusive of 0%) It is also a precipitation strengthening element, but Nb is less than 0.1%.
Since the above-mentioned effects reach saturation even if the content of 1% and Ti exceeds 0.06%, the above values are set as the upper limits.
【００１９】鋼線材についての（１）式で求められる変
形抵抗比 ＦＳＲ＝σ／ＴＳ ・・・・・・・・（１） 但し σ：変形抵抗（Ｎ／ｍｍ2 ） ＴＳ：引張強度（Ｎ／ｍｍ2 ） 良く知られている様に、鋼線材の引張強度が大きくなる
と、それに対応して冷間加工時の変形抵抗が大きくな
る。しかし本発明者等が種々研究したところによれば、
同じ引張強度を与えるものであっても、上記（１）式で
与えられる変形抵抗比を小さくした鋼線材では、冷間圧
造の為の工具寿命が優れたものとなることが明らかとな
った。特に後記実施例で示す様に、変形抵抗比が１．２
以下になると、工具寿命が非常に優れたものとなること
が分かった。The change of the steel wire rod obtained by the equation (1)
Form resistance ratio FSR = σ / TS (1) where σ: Deformation resistance (N / mm 2 ) TS: Tensile strength (N / mm 2 ) As is well known, steel wire rods The higher the tensile strength of, the higher the corresponding deformation resistance during cold working. However, according to various studies by the present inventors,
It has been clarified that even if the same tensile strength is given, a steel wire material having a small deformation resistance ratio given by the above formula (1) has an excellent tool life for cold heading. In particular, as shown in Examples below, the deformation resistance ratio is 1.2.
It has been found that the tool life becomes very excellent when:
【００２０】[0020]
【実施例】表１に示す化学成分からなる鋼線材を溶製し
て得られる鋼塊を熱間圧延、次いで伸線加工した。得ら
れた鋼線材について、変形抵抗及び引張強度を測定し、
これらの値から変形抵抗比を求め、これらを表１に併記
した。ただし表１における従来材は熱間圧延後に球状化
焼きなましを行い、次いでサイジングの為の伸線加工を
行った後の測定結果である。Example A steel ingot obtained by melting a steel wire rod having the chemical composition shown in Table 1 was hot-rolled and then wire-drawn. For the obtained steel wire rod, the deformation resistance and the tensile strength were measured,
The deformation resistance ratios were calculated from these values, and these are also shown in Table 1. However, the conventional materials in Table 1 are the measurement results after hot rolling, spheroidizing annealing, and then wire drawing for sizing.
【００２１】[0021]
【表１】 [Table 1]
【００２２】図１は、上記線材を用いてボルトを圧造し
た時の工具寿命を、変形抵抗比との関係で整理して示し
たものである。図では、従来材を加工した時の工具寿命
を１とした時の比で示している。従来材では変形抵抗比
がかなり高いにもかかわらず焼きなまし等の調質処理に
よって優れた工具寿命を示している。これに対し本発明
材及び比較材はいずれも非調質材である為、調質材であ
る従来材より工具寿命において見劣りするが、その程度
は、変形抵抗比の高い比較材において顕著であった。こ
れに対し、変形抵抗比が１．２以下である本発明材で
は、従来材との比で７０％以上の工具寿命を示してお
り、非調質化による経済的メリットと総合して解釈すれ
ば、結果的には従来材を凌駕する経済性を示すものであ
るとの結論に至った。FIG. 1 shows the tool life when a bolt is forged using the above wire rod, in relation to the deformation resistance ratio. In the figure, it is shown as a ratio when the tool life when processing the conventional material is 1. The conventional material has an excellent tool life due to tempering treatment such as annealing although the deformation resistance ratio is quite high. On the other hand, since the material of the present invention and the comparative material are both non-tempered materials, they are inferior in tool life to the conventional material which is the tempered material, but the degree is remarkable in the comparative material having a high deformation resistance ratio. It was On the other hand, the material of the present invention having a deformation resistance ratio of 1.2 or less has a tool life of 70% or more as compared with the conventional material, which should be interpreted comprehensively with the economic merit of non-refining. As a result, it was concluded that the result shows an economic efficiency superior to that of conventional materials.
【００２３】[0023]
【発明の効果】本発明は上記の様に構成されているの
で、鋼線材の化学成分及び伸線加工後の変形抵抗比を規
定することによって、非調質材としては、冷間圧造時の
変形抵抗をかなり低減することが可能となり、圧造工具
の寿命を延長した。その結果、非調質化によってもたら
される生産コストの低減効果と総合して考察すれば、総
合的には優れた経済性生産コストの低減に寄与できるこ
ととなった。EFFECTS OF THE INVENTION Since the present invention is constituted as described above, the chemical composition of the steel wire and the deformation resistance ratio after the wire drawing are regulated so that the non-heat treated material can be used in cold forging. It has become possible to significantly reduce the deformation resistance and extend the life of the forging tool. As a result, comprehensively considering the reduction effect of production cost brought about by non-conditioning, it was possible to contribute to the reduction of production cost with excellent economic efficiency.
【図１】変形抵抗比と工具寿命の関係を示すグラフ。FIG. 1 is a graph showing the relationship between deformation resistance ratio and tool life.
Claims (1)
は以下単に％と略記する） Ｓｉ：０．５％以下（０％を含まない） Ｍｎ：０．７０〜１．８０％ を満足し、且つ熱間圧延及び伸線加工を施すことによっ
て７００Ｎ／ｍｍ2 以上級の引張強度を有する鋼線材で
あって、 下記（１）式で求められる変形抵抗比が１．２以下であ
ることを特徴とする冷間圧造性の優れた高強度非調質鋼
線材。 ＦＳＲ＝σ／ＴＳ ・・・・・・・・（１） 但し σ：変形抵抗（Ｎ／ｍｍ2 ） ＴＳ：引張強度（Ｎ／ｍｍ2 ）1. C: 0.15-0.35 mass% (mass%
Is simply abbreviated as%) Si: 0.5% or less (not including 0%) Mn: 0.70 to 1.80%, and 700 N / by performing hot rolling and wire drawing. A steel wire rod having a tensile strength of at least mm 2 and having a deformation resistance ratio of 1.2 or less calculated by the following formula (1), which is excellent in cold forging and has high strength and non-heat treated properties. Steel wire rod. FSR = σ / TS (1) where σ: deformation resistance (N / mm 2 ) TS: tensile strength (N / mm 2 )
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22941295A JPH0971842A (en) | 1995-09-06 | 1995-09-06 | High strength non-heat treated steel wire rod excellent in cold heading property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22941295A JPH0971842A (en) | 1995-09-06 | 1995-09-06 | High strength non-heat treated steel wire rod excellent in cold heading property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0971842A true JPH0971842A (en) | 1997-03-18 |
Family
ID=16891825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22941295A Pending JPH0971842A (en) | 1995-09-06 | 1995-09-06 | High strength non-heat treated steel wire rod excellent in cold heading property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0971842A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929623A (en) * | 2017-03-27 | 2017-07-07 | 武钢集团昆明钢铁股份有限公司 | A kind of preparation method of 10.9 grade high-strength bolt steel hot rolling wire rod |
| CN111945066A (en) * | 2020-08-04 | 2020-11-17 | 浙江晋椿精密工业股份有限公司 | A high-strength polishing rod for differential planetary shaft |
| CN112760561A (en) * | 2020-12-21 | 2021-05-07 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for hand tool and preparation method thereof |
-
1995
- 1995-09-06 JP JP22941295A patent/JPH0971842A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929623A (en) * | 2017-03-27 | 2017-07-07 | 武钢集团昆明钢铁股份有限公司 | A kind of preparation method of 10.9 grade high-strength bolt steel hot rolling wire rod |
| CN106929623B (en) * | 2017-03-27 | 2018-09-14 | 武钢集团昆明钢铁股份有限公司 | A kind of preparation method of 10.9 grade high-strength bolt steel hot rolling wire rod |
| CN111945066A (en) * | 2020-08-04 | 2020-11-17 | 浙江晋椿精密工业股份有限公司 | A high-strength polishing rod for differential planetary shaft |
| CN112760561A (en) * | 2020-12-21 | 2021-05-07 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for hand tool and preparation method thereof |
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