WO2010101154A1 - Method of producing steel wire - Google Patents

Method of producing steel wire Download PDF

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Publication number
WO2010101154A1
WO2010101154A1 PCT/JP2010/053352 JP2010053352W WO2010101154A1 WO 2010101154 A1 WO2010101154 A1 WO 2010101154A1 JP 2010053352 W JP2010053352 W JP 2010053352W WO 2010101154 A1 WO2010101154 A1 WO 2010101154A1
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WO
WIPO (PCT)
Prior art keywords
wire
steel wire
final
wire drawing
drawing step
Prior art date
Application number
PCT/JP2010/053352
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French (fr)
Japanese (ja)
Inventor
泰之 阿部
Original Assignee
株式会社ブリヂストン
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Priority to CN2010800104871A priority Critical patent/CN102341194A/en
Priority to EP10748749.8A priority patent/EP2404681B1/en
Priority to JP2011502765A priority patent/JP5701744B2/en
Priority to US13/254,308 priority patent/US20110314888A1/en
Publication of WO2010101154A1 publication Critical patent/WO2010101154A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/066—Reinforcing cords for rubber or plastic articles the wires being made from special alloy or special steel composition
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D07B2205/3035—Pearlite
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D07B2205/3046—Steel characterised by the carbon content
    • D07B2205/3057—Steel characterised by the carbon content having a high carbon content, e.g. greater than 0,8 percent respectively SHT or UHT wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tire cords

Definitions

  • the present invention relates to a method of manufacturing a steel wire (hereinafter, also simply referred to as “manufacturing method”), and more particularly, to a method of manufacturing a steel wire that can reduce energy required for manufacturing the steel wire.
  • Steel cords made of twisted steel strands are used as reinforcing materials for rubber articles such as tires.
  • the high carbon steel wire used for this steel wire etc. is conventionally manufactured by the following processes.
  • Such a high carbon steel wire is made from a high carbon steel wire having a diameter of about 5.5 mm, which is made into a pearlite structure by a stealmore treatment.
  • the raw material is drawn to obtain an intermediate wire larger than the final diameter.
  • dry-type drawing is generally applied, and in some cases, two-step drawing with heat treatment interposed is applied.
  • the intermediate wire is subjected to a patenting heat treatment to obtain a heat-treated wire having a fine pearlite structure, and when producing a strand for reinforcing rubber articles, a brass plating treatment is performed following the heat treatment. .
  • the heat-treated wire is drawn to obtain a steel wire having a desired final diameter and a desired tensile strength.
  • the wet wire drawing method is applied to the final wire drawing.
  • the tensile strength of the steel wire produced in the above process is greatly affected by the composition of raw materials (mainly carbon content) and the amount of wire drawing in the final wire drawing process. That is, the higher the carbon content and the greater the amount of wire drawing in the final wire drawing step, the higher the tensile strength of the steel wire.
  • the carbon content of a raw material generally used for manufacturing a steel cord strand is 0.80 to 0.86% by mass (hereinafter referred to as “80C material”).
  • 80C material the carbon content of a raw material generally used for manufacturing a steel cord strand.
  • the following formula, ⁇ f 2ln (D0 / Df) (Where Df represents the final diameter of the steel wire obtained in the final wire drawing process, D0 represents the diameter of the heat-treated wire before the final wire drawing, and ln is a natural logarithm).
  • the wire drawing amount ⁇ f in the final wire drawing step is about 3.2 when a steel wire having a diameter of 0.23 mm and a tensile strength of about 3200 MPa is manufactured using such raw materials.
  • a technique for increasing the strength and a technique for further reducing the manufacturing cost have been demanded.
  • Patent Documents 1 to 4 disclose techniques for improving tensile strength by using 80C material and improving final wire drawing conditions to increase the final wire drawing amount.
  • Patent Documents 5 and 6 disclose a technique for improving tensile strength by adjusting a wire drawing amount in a pre-drawing process for producing an intermediate wire using a raw material having an increased carbon content. Yes.
  • Patent Document 7 discloses a technique for improving tensile strength by using a raw material having an increased carbon content and adding an alloy element such as Cr.
  • Patent Documents 8 and 9 a steel wire having a tensile strength equivalent to that obtained when the 80C material is applied by using a raw material having a carbon content smaller than that of the 80C material and increasing the final wire drawing amount is manufactured. Techniques to do this are disclosed.
  • JP-A-8-132128 (Claims etc.) JP-A-8-218282 (Claims etc.) Japanese Patent Laid-Open No. 10-325089 (Claims etc.) Japanese Patent Laid-Open No. 11-241280 (claims, etc.) JP-A-6-136453 (claims, etc.) Japanese Unexamined Patent Publication No. 2007-111767 (Claims etc.) JP 2008-69409 A (Claims etc.) JP-A-8-260096 (Claims etc.) JP-A-8-325964 (Claims etc.)
  • an object of the present invention is to provide a manufacturing method capable of solving a problem in the above prior art and manufacturing a steel wire having a good tensile strength with a small processing energy. Specifically, it is to provide a production method capable of producing a steel wire having a tensile strength equivalent to that of a steel wire obtained by a conventional general production method using 80C material with a small processing energy.
  • the present inventor has obtained the following knowledge. That is, in the final wire drawing, a wet slip wire drawing method is usually employed, but the wire drawing method of the wet wire drawing is a method of drawing a wire with a capstan in a lubricating liquid.
  • the wire drawing method of the wet wire drawing is a method of drawing a wire with a capstan in a lubricating liquid.
  • a speed difference that is, a slip is required between the capstan and the wire, and this slip causes a loss of production power.
  • the dry-type wire drawing machine used for pre-drawing has a knowledge that the speed is controlled by one motor per capstan, so that slip does not occur and production power loss is small. .
  • the friction coefficient is large because the die interface is in an extreme pressure lubrication state where the wire surface is plated and metal touched.
  • dry wire drawing is considered to have a low friction coefficient because a powdery lubricant is drawn into the die interface and the lubricant dissolves, resulting in a fluid lubrication state.
  • the wet wire drawing consumes more power than the dry wire drawing. Therefore, as a result of further diligent examination based on such knowledge, the present inventor has adjusted the wire drawing amount ⁇ f in the final wire drawing process to reduce the steel wire having a good tensile strength to a small processing energy. As a result, the present invention has been completed.
  • the method for producing a steel wire of the present invention includes a pre-drawing step of drawing a high carbon steel wire containing 0.90 to 1.20% by mass of carbon into an intermediate wire, and the intermediate wire.
  • a method of manufacturing a steel wire including a heat treatment step of performing a patenting heat treatment to obtain a heat-treated wire, and a final wire drawing step of drawing the heat-treated wire to obtain a steel wire
  • the wire drawing amount ⁇ f in the final wire drawing step is 2.50 to 3.10.
  • the metal structure of the high carbon steel wire is preferably pearlite, and the diameter of the steel wire obtained in the final wire drawing step is 0.05 to 0.00.
  • the method for producing a steel wire of the present invention includes a tensile strength TSf of the steel wire obtained in the final wire drawing step, a tensile strength TS of the heat-treated wire, and the ⁇ f. Is the following formula: TS ⁇ exp (0.24 ⁇ ⁇ f) ⁇ TSf ⁇ TS ⁇ exp (0.30 ⁇ ⁇ f) It is preferable to satisfy the relationship represented by: TSf is more preferably 2700 to 3300 MPa.
  • a high carbon steel wire containing 0.90 to 1.05% by mass of carbon is drawn to obtain an intermediate wire, and the ⁇ f is set to 2.70 to 3. 05, and the TSf is preferably 2700-3200 MPa.
  • the method for producing a steel wire of the present invention includes a pre-drawing step for drawing a high carbon steel wire to an intermediate wire, a heat treatment step for subjecting the intermediate wire to a patenting heat treatment to a heat-treated wire, And a final drawing step of drawing the heat-treated wire to obtain a steel wire.
  • the method for producing a steel wire of the present invention uses a high carbon steel wire containing 0.90 to 1.20% by mass of carbon as a raw material, and Cr, Ni, V, etc. are used as the high carbon steel wire.
  • a raw material to which the alloy element is added may be used. If the amount of carbon contained in the high carbon steel wire is less than 0.90% by mass, the required amount of processing in the final wire drawing process cannot be set much lower than when a general 80C material is applied. Is small. On the other hand, when it exceeds 1.20% by mass, it becomes difficult to obtain a uniform metal structure in the heat treatment step, and the wire drawing workability of the heat-treated wire is inferior.
  • the wire drawing amount ⁇ f in the final wire drawing step is 2.50 to 3.10, preferably 2.60 to 3.00.
  • the drawing amount ⁇ f is less than 2.50, it is difficult to obtain a tensile strength desired as a rubber reinforcing wire or a rope wire.
  • the amount of wire drawing ⁇ f exceeds 3.10, the energy required for the final wire drawing increases, making it difficult to obtain an energy saving effect.
  • the energy consumed in the production of steel wire is large in the proportion of power required for the final wire drawing process. Therefore, by adjusting the wire drawing amount ⁇ f in the final wire drawing step, a steel wire having a good tensile strength can be manufactured with a small amount of processing energy.
  • the amount of wire drawing required in the final wire drawing process to obtain the same tensile strength as that of the conventional product can be reduced. It is possible to reduce the energy required for this.
  • reducing the final wire drawing amount is advantageous for improving the ductility of the steel wire, and can be expected to have accompanying effects such as an improvement in productivity due to a reduction in disconnection and an improvement in the quality of the steel wire.
  • the metal structure of the high carbon steel wire is preferably pearlite. This is because pearlite steel has a higher work hardening rate than martensite steel.
  • the diameter of the steel wire obtained in the final wire drawing step is preferably 0.05 to 0.50 mm. This range is a desirable diameter range for rubber reinforcement and rope strands, and a steel wire having good tensile strength can be produced with less processing energy.
  • the tensile strength TSf of the steel wire obtained in the final wire drawing step, the tensile strength TS of the heat-treated wire, and ⁇ f are expressed by the following equations: TS ⁇ exp (0.24 ⁇ ⁇ f) ⁇ TSf ⁇ TS ⁇ exp (0.30 ⁇ ⁇ f) It is preferable to satisfy the relationship represented by: TSf is more preferably 2700 to 3300 MPa. If the tensile strength of the steel wire is less than 2700 MPa, the strength may be insufficient as a strand for rubber reinforcement or rope. On the other hand, if the tensile strength of the steel wire exceeds 3300 MPa, the carbon content is increased. This is because it is necessary to set a large amount of processing in the final wire drawing process, which may reduce the energy saving effect.
  • a high carbon steel wire containing 0.90 to 1.05% by mass of carbon is drawn to obtain an intermediate wire, and the drawing amount ⁇ f is 2.70.
  • the tensile strength of the steel wire obtained in the final wire drawing step is preferably 2700 to 3200 MPa. Thereby, the steel wire which has favorable tensile strength can be manufactured with less processing energy. Moreover, it becomes easy to obtain a uniform metal structure in the heat treatment step by setting the upper limit of the amount of carbon contained in the high carbon steel wire to 1.05.
  • the carbon content in the high carbon steel wire, the wire drawing amount ⁇ f, and the tensile strength of the steel wire obtained in the final wire drawing step are important.
  • it can carry out suitably according to a conventional method as desired, and it does not restrict
  • the steel wire manufacturing method of the present invention can be used for manufacturing steel cord strands for reinforcing rubber articles, wire rope strands, and the like.
  • Example 1 Diameter 5.5.
  • An intermediate wire was produced by drawing a high carbon steel wire (102C material) containing 1.02 mass% of carbon in mm (pre-drawing step). The pre-drawing step was performed without intermediate heat treatment.
  • the obtained intermediate wire was subjected to patenting heat treatment to produce a heat-treated wire (heat treatment step, heat treatment plating).
  • the heat treated wire was subjected to wire drawing (final wire drawing step) to obtain a steel wire of Example 1 having a diameter of 0.19 mm and a tensile strength TSf of 3000 MPa.
  • the metal structure of the high carbon steel wire used is a substantially uniform pearlite structure.
  • Table 1 below shows the manufacturing conditions of Example 1, the intermediate wire diameter (mm), the amount of wire drawing ⁇ in the previous wire drawing step, the tensile strength (TS, unit MPa) of the heat-treated wire, and the final The final diameter (mm) of the steel wire obtained in the wire drawing step, the drawing amount ⁇ f in the final wire drawing step, and the tensile strength (TSf, unit MPa) of the steel wire obtained in the final wire drawing step are shown. .
  • Table 1 shows the carbon content (mass%), diameter (mm), and material abbreviations of the raw materials used.
  • Example 2 A steel wire of Example 2 having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as Example 1 except that the production conditions shown in Table 1 were used.
  • Comparative Example 1 A steel wire of Comparative Example 1 having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as in Example 1 except that the production conditions shown in Table 1 were used.
  • Comparative Example 2 The 90C material was processed using the manufacturing conditions shown in the conventional example to obtain a steel wire of Comparative Example 2 having a diameter of 0.19 mm and a TSf of 3350 MPa.
  • Comparative Example 3 A steel wire of Comparative Example 3 having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as in Example 1 except that the production conditions shown in Table 1 were used.
  • the ratio of the required energy in the final wire drawing process was large.
  • the required energy in the final wire drawing process of the high carbon steel material can be reduced.
  • the steel wire with good tensile strength can be produced with less processing energy.
  • steel wires having a diameter of 0.19 mm and a steel wire having a tensile strength of 3000 and 3350 MPa are given as examples. However, the same effect can be obtained in the manufacture of steel wires having different diameters or tensile strengths of steel wires. Can be obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

Disclosed is a method of producing a steel wire having good tensile strength with little machining energy. Specifically disclosed is a method of producing a steel wire, comprising a pre-wire drawing step for producing a semi-finished wire rod by drawing a high-carbon steel wire rod containing 0.90-1.20 mass% of carbon, a heat treatment step for producing a heat treated wire rod by carrying out patenting heat treatment on the semi-finished wire rod, and a final wire drawing step for producing a steel wire by drawing the heat treated wire rod, wherein the amount of wire drawing (εf) in the final wire drawing step satisfies the relation represented by the expression: εf=21n(D0/Df) (in the expression, Df denotes the final diameter of a steel wire obtained in the final wire drawing step, D0 denotes the diameter of the heat treated wire rod prior to the final wire drawing step, and ln denotes natural logarithm), and the amount of wire drawing (εf) in the final wire drawing step is 2.50-3.10.

Description

鋼線の製造方法Steel wire manufacturing method
　本発明は、鋼線の製造方法（以下、単に「製造方法」とも称する）に関し、詳しくは、鋼線の製造に要するエネルギーの削減を可能とする鋼線の製造方法に関する。 The present invention relates to a method of manufacturing a steel wire (hereinafter, also simply referred to as “manufacturing method”), and more particularly, to a method of manufacturing a steel wire that can reduce energy required for manufacturing the steel wire.
　タイヤを初めとするゴム物品等の補強材として、スチール素線の撚り合わせ等からなるスチールコードが用いられている。 Steel cords made of twisted steel strands are used as reinforcing materials for rubber articles such as tires.
　このスチール素線等に用いられる高炭素鋼線は、従来より、次のような工程で製造されている。かかる高炭素鋼線は、ステルモア処理によりパーライト組織とされた直径約５．５ｍｍの高炭素鋼線材を原材料としている。また、前伸線工程として、原材料に伸線加工を施し、最終直径よりも大きい中間線材を得る。この前伸線加工は乾式伸線を適用するのが一般的であり、熱処理を挟んだ２工程の伸線加工を適用する場合もある。 The high carbon steel wire used for this steel wire etc. is conventionally manufactured by the following processes. Such a high carbon steel wire is made from a high carbon steel wire having a diameter of about 5.5 mm, which is made into a pearlite structure by a stealmore treatment. Also, as a pre-drawing step, the raw material is drawn to obtain an intermediate wire larger than the final diameter. As this pre-drawing process, dry-type drawing is generally applied, and in some cases, two-step drawing with heat treatment interposed is applied.
　さらに、熱処理工程として、中間線材にパテンティング熱処理を施し、微細パーライト組織を有する熱処理済み線材を得、ゴム物品補強用の素線を製造する際は、熱処理に続いてブラスメッキ処理を施している。 Furthermore, as a heat treatment step, the intermediate wire is subjected to a patenting heat treatment to obtain a heat-treated wire having a fine pearlite structure, and when producing a strand for reinforcing rubber articles, a brass plating treatment is performed following the heat treatment. .
　さらにまた、最終伸線工程として、熱処理済み線材に伸線加工を施し、所望の最終直径と所望の引張強さを有する鋼線を得る。かかる最終伸線加工は、湿式伸線法を適用するのが一般的である。 Furthermore, as a final drawing step, the heat-treated wire is drawn to obtain a steel wire having a desired final diameter and a desired tensile strength. In general, the wet wire drawing method is applied to the final wire drawing.
　また、上記工程で製造された鋼線の引張強さは、原材料の組成（主として炭素含有量）と、最終伸線工程における伸線加工量の影響が大きい。すなわち、炭素含有量が多いほど、また、最終伸線工程における伸線加工量が大きいほど高い引張強さの鋼線が得られる。 Also, the tensile strength of the steel wire produced in the above process is greatly affected by the composition of raw materials (mainly carbon content) and the amount of wire drawing in the final wire drawing process. That is, the higher the carbon content and the greater the amount of wire drawing in the final wire drawing step, the higher the tensile strength of the steel wire.
　例えば、スチールコード用素線の製造に一般的に用いられている原材料の炭素含有量は、０．８０～０．８６質量％（以下、これを「８０Ｃ材」と称する）である。次式、
　εｆ＝２ｌｎ（Ｄ０／Ｄｆ）
（式中、Ｄｆは最終伸線工程で得る鋼線の最終直径を示し、Ｄ０は最終伸線前の熱処理済み線材の直径を示し、ｌｎは自然対数である）で表される関係を満足する、最終伸線工程における伸線加工量εｆについては、かかる原材料を使用して、直径０．２３ｍｍで引張強さ約３２００ＭＰａの鋼線を製造する場合、約３．２である。このような一般的な技術に対して、より高強度化するための技術やより製造コストを低くするための技術が求められていた。 For example, the carbon content of a raw material generally used for manufacturing a steel cord strand is 0.80 to 0.86% by mass (hereinafter referred to as “80C material”). The following formula,
εf = 2ln (D0 / Df)
(Where Df represents the final diameter of the steel wire obtained in the final wire drawing process, D0 represents the diameter of the heat-treated wire before the final wire drawing, and ln is a natural logarithm). The wire drawing amount εf in the final wire drawing step is about 3.2 when a steel wire having a diameter of 0.23 mm and a tensile strength of about 3200 MPa is manufactured using such raw materials. In contrast to such a general technique, a technique for increasing the strength and a technique for further reducing the manufacturing cost have been demanded.
　そこで、特許文献１～４には、８０Ｃ材を用い、最終伸線条件を改良して最終伸線加工量を増加させることにより引張強さを向上させる技術が開示されている。また、特許文献５および６には、炭素含有量を増加した原材料を用い、中間線材を作製する前伸線工程の伸線加工量を調整することにより引張強さを向上させる技術が開示されている。さらに、特許文献７には、炭素含有量を増加した原材料を用い、Ｃｒ等の合金元素を添加することにより引張強さを向上させる技術が開示されている。 Therefore, Patent Documents 1 to 4 disclose techniques for improving tensile strength by using 80C material and improving final wire drawing conditions to increase the final wire drawing amount. Patent Documents 5 and 6 disclose a technique for improving tensile strength by adjusting a wire drawing amount in a pre-drawing process for producing an intermediate wire using a raw material having an increased carbon content. Yes. Furthermore, Patent Document 7 discloses a technique for improving tensile strength by using a raw material having an increased carbon content and adding an alloy element such as Cr.
　さらにまた、特許文献８および９には、８０Ｃ材よりも炭素含有量が少ない原材料を用い、最終伸線加工量を増すことにより８０Ｃ材を適用した場合と同等の引張強さの鋼線を製造する技術が開示されている。 Furthermore, in Patent Documents 8 and 9, a steel wire having a tensile strength equivalent to that obtained when the 80C material is applied by using a raw material having a carbon content smaller than that of the 80C material and increasing the final wire drawing amount is manufactured. Techniques to do this are disclosed.
特開平８－１３２１２８号公報（特許請求の範囲等）JP-A-8-132128 (Claims etc.) 特開平８－２１８２８２号公報（特許請求の範囲等）JP-A-8-218282 (Claims etc.) 特開平１０－３２５０８９号公報（特許請求の範囲等）Japanese Patent Laid-Open No. 10-325089 (Claims etc.) 特開平１１－２４１２８０号公報（特許請求の範囲等）Japanese Patent Laid-Open No. 11-241280 (claims, etc.) 特開平６－１３６４５３号公報（特許請求の範囲等）JP-A-6-136453 (claims, etc.) 特開２００７－１１１７６７号公報（特許請求の範囲等）Japanese Unexamined Patent Publication No. 2007-111767 (Claims etc.) 特開２００８－６９４０９号公報（特許請求の範囲等）JP 2008-69409 A (Claims etc.) 特開平８－２６００９６号公報（特許請求の範囲等）JP-A-8-260096 (Claims etc.) 特開平８－３２５９６４号公報（特許請求の範囲等）JP-A-8-325964 (Claims etc.)
　しかしながら、特許文献１～７記載の技術では、環境負荷の低減が求められている中で、製造に要するエネルギーについて考慮されていない。また、特許文献８および９記載の技術では、原材料のコストは削減できるものの、最終伸線加工量の増加が必要であるため加工に必要なエネルギーは削減されず、より少ない加工エネルギーで鋼線を製造できる鋼線の製造方法が求められている。 However, in the technologies described in Patent Documents 1 to 7, energy required for manufacturing is not taken into consideration while reducing the environmental load. Further, in the techniques described in Patent Documents 8 and 9, although the cost of raw materials can be reduced, the energy required for processing is not reduced because the final wire drawing amount needs to be increased, and the steel wire can be formed with less processing energy. There is a need for a method of manufacturing a steel wire that can be manufactured.
　そこで本発明の目的は、上記従来技術における問題を解消して、良好な引張り強さを有する鋼線を、少ない加工エネルギーにて製造できる製造方法を提供することである。具体的には、８０Ｃ材を用いた従来の一般的な製造方法によって得られる鋼線と同等の引張り強さの鋼線を、少ない加工エネルギーにて製造できる製造方法を提供することである。 Therefore, an object of the present invention is to provide a manufacturing method capable of solving a problem in the above prior art and manufacturing a steel wire having a good tensile strength with a small processing energy. Specifically, it is to provide a production method capable of producing a steel wire having a tensile strength equivalent to that of a steel wire obtained by a conventional general production method using 80C material with a small processing energy.
　本発明者は、上記課題を解決すべく鋭意検討した結果、以下の知見を得た。すなわち、通常、最終伸線加工では、湿式スリップ伸線方式が採用されているが、湿式伸線加工の伸線方式は、潤滑液中でワイヤをキャプスタンにより引き抜く方式である。ここで、生産、設備上の効率を考えると、１台の伸線機で同時に２０段程度の連続伸線を行い、各段のキャプスタンを一台のモーターで駆動することが好ましい。しかしながら、伸線機の構造上、キャプスタンとワイヤには速度差、すなわち、スリップが必要となり、このスリップが製造電力の損失となる。一方、前伸線加工に用いられる乾式伸線機は、キャプスタン１段につき１台のモーターで速度制御する方式のため、スリップが発生せず、製造電力の損失は少ないとの知見を得た。 As a result of intensive studies to solve the above problems, the present inventor has obtained the following knowledge. That is, in the final wire drawing, a wet slip wire drawing method is usually employed, but the wire drawing method of the wet wire drawing is a method of drawing a wire with a capstan in a lubricating liquid. Here, considering the efficiency in production and equipment, it is preferable to perform continuous wire drawing of about 20 stages simultaneously with one wire drawing machine and drive the capstan of each stage with one motor. However, due to the structure of the wire drawing machine, a speed difference, that is, a slip is required between the capstan and the wire, and this slip causes a loss of production power. On the other hand, the dry-type wire drawing machine used for pre-drawing has a knowledge that the speed is controlled by one motor per capstan, so that slip does not occur and production power loss is small. .
　また、最終湿式伸線では、ダイス界面では、ワイヤ表面のめっきとメタルタッチした極圧潤滑状態となっているため、摩擦係数が大きい。一方、乾式伸線は粉末状の潤滑剤がダイス界面に引き込まれ、潤滑剤が溶けることにより流体潤滑状態となっており、摩擦係数が小さいと考えられている。このため、湿式伸線は乾式伸線と比較して消費電力が大きいと考えられる。そこで、本発明者は、かかる知見をもとにさらに鋭意検討した結果、最終伸線工程における伸線加工量εｆを調整することにより、良好な引張り強さを有する鋼線を、少ない加工エネルギーにて製造できることを見出して、本発明を完成するに至った。 Also, in the final wet drawing, the friction coefficient is large because the die interface is in an extreme pressure lubrication state where the wire surface is plated and metal touched. On the other hand, dry wire drawing is considered to have a low friction coefficient because a powdery lubricant is drawn into the die interface and the lubricant dissolves, resulting in a fluid lubrication state. For this reason, it is considered that the wet wire drawing consumes more power than the dry wire drawing. Therefore, as a result of further diligent examination based on such knowledge, the present inventor has adjusted the wire drawing amount εf in the final wire drawing process to reduce the steel wire having a good tensile strength to a small processing energy. As a result, the present invention has been completed.
　即ち、本発明の鋼線の製造方法は、０．９０～１．２０質量％の炭素を含有する高炭素鋼線材に伸線加工を施して中間線材とする前伸線工程と、この中間線材にパテンティング熱処理を施して熱処理済み線材とする熱処理工程と、この熱処理済み線材に伸線加工を施して鋼線を得る最終伸線工程とを含む鋼線の製造方法において、
　最終伸線工程における伸線加工量εｆが、次式、
　εｆ＝２ｌｎ（Ｄ０／Ｄｆ）
（式中、Ｄｆは最終伸線工程で得る鋼線の最終直径を示し、Ｄ０は最終伸線工程前の熱処理済み線材の直径を示し、ｌｎは自然対数である）で表される関係を満足する、最終伸線工程における伸線加工量εｆが、２．５０～３．１０であることを特徴とするものである。 That is, the method for producing a steel wire of the present invention includes a pre-drawing step of drawing a high carbon steel wire containing 0.90 to 1.20% by mass of carbon into an intermediate wire, and the intermediate wire. In a method of manufacturing a steel wire, including a heat treatment step of performing a patenting heat treatment to obtain a heat-treated wire, and a final wire drawing step of drawing the heat-treated wire to obtain a steel wire,
The wire drawing amount εf in the final wire drawing process is expressed by the following equation:
εf = 2ln (D0 / Df)
(In the formula, Df represents the final diameter of the steel wire obtained in the final wire drawing step, D0 represents the diameter of the heat-treated wire before the final wire drawing step, and ln is a natural logarithm). The wire drawing amount εf in the final wire drawing step is 2.50 to 3.10.
　また、本発明の鋼線の製造方法は、前記高炭素鋼線材の金属組織がパーライトであることが好ましく、さらに、前記最終伸線工程で得られる鋼線の直径を、０．０５～０．５０ｍｍとすることが好ましく、さらにまた、本発明の鋼線の製造方法は、前記最終伸線工程で得られる鋼線の引張り強さＴＳｆと、熱処理済み線材の引張り強さＴＳと、前記εｆとが次式、
ＴＳ×ｅｘｐ（０．２４×εｆ）≦ＴＳｆ≦ＴＳ×ｅｘｐ（０．３０×εｆ）
で表わされる関係を満足することが好ましく、より好ましくは、ＴＳｆは、２７００～３３００ＭＰａである。 In the method for producing a steel wire of the present invention, the metal structure of the high carbon steel wire is preferably pearlite, and the diameter of the steel wire obtained in the final wire drawing step is 0.05 to 0.00. Preferably, the method for producing a steel wire of the present invention includes a tensile strength TSf of the steel wire obtained in the final wire drawing step, a tensile strength TS of the heat-treated wire, and the εf. Is the following formula:
TS × exp (0.24 × εf) ≦ TSf ≦ TS × exp (0.30 × εf)
It is preferable to satisfy the relationship represented by: TSf is more preferably 2700 to 3300 MPa.
　また、本発明の鋼線の製造方法は、０．９０～１．０５質量％の炭素を含有する高炭素鋼線材に伸線加工を施して中間線材とし、前記εｆを２．７０～３．０５とし、前記ＴＳｆを２７００～３２００ＭＰａとすることが好ましい。 In the method for producing a steel wire of the present invention, a high carbon steel wire containing 0.90 to 1.05% by mass of carbon is drawn to obtain an intermediate wire, and the εf is set to 2.70 to 3. 05, and the TSf is preferably 2700-3200 MPa.
　本発明によれば、良好な引張り強さを有する鋼線を、少ない加工エネルギーにて製造できる製造方法を提供することができる。 According to the present invention, it is possible to provide a production method capable of producing a steel wire having a good tensile strength with less processing energy.
　以下、本発明の実施形態につき、具体的に説明する。
　本発明の鋼線の製造方法は、高炭素鋼線材に伸線加工を施して中間線材とする前伸線工程と、この中間線材にパテンティング熱処理を施して熱処理済み線材とする熱処理工程と、この熱処理済み線材に伸線加工を施して鋼線を得る最終伸線工程とを含むものである。 Hereinafter, embodiments of the present invention will be specifically described.
The method for producing a steel wire of the present invention includes a pre-drawing step for drawing a high carbon steel wire to an intermediate wire, a heat treatment step for subjecting the intermediate wire to a patenting heat treatment to a heat-treated wire, And a final drawing step of drawing the heat-treated wire to obtain a steel wire.
　また、本発明の鋼線の製造方法は、０．９０～１．２０質量％の炭素を含有する高炭素鋼線材を原材料とするものであり、かかる高炭素鋼線材にＣｒ、Ｎｉ、Ｖ等の合金元素が添加された原材料を用いてもよい。高炭素鋼線材中に含有する炭素の量が、０．９０質量％未満では、一般的な８０Ｃ材を適用した場合に比べ、最終伸線工程における所要加工量を大して低く設定できないので、省エネ効果が小さい。一方、１．２０質量％を超えると、熱処理工程において均一な金属組織を得難くなり、熱処理済み線材の伸線加工性が劣る。 The method for producing a steel wire of the present invention uses a high carbon steel wire containing 0.90 to 1.20% by mass of carbon as a raw material, and Cr, Ni, V, etc. are used as the high carbon steel wire. A raw material to which the alloy element is added may be used. If the amount of carbon contained in the high carbon steel wire is less than 0.90% by mass, the required amount of processing in the final wire drawing process cannot be set much lower than when a general 80C material is applied. Is small. On the other hand, when it exceeds 1.20% by mass, it becomes difficult to obtain a uniform metal structure in the heat treatment step, and the wire drawing workability of the heat-treated wire is inferior.
　さらに、本発明の鋼線の製造方法は、次式、
　εｆ＝２ｌｎ（Ｄ０／Ｄｆ）
（式中、Ｄｆは最終伸線工程で得る鋼線の最終直径を示し、Ｄ０は最終伸線工程前の熱処理済み線材の直径を示し、ｌｎは自然対数である）で表される関係を満足する、最終伸線工程における伸線加工量εｆが、２．５０～３．１０、好ましくは２．６０～３．００である。伸線加工量εｆが２．５０未満では、ゴム補強用やロープ用素線として望まれる引張強さを得難くなる。一方、伸線加工量εｆが３．１０を超えると、最終伸線に要するエネルギーが大きくなるので、省エネ効果を得難くなる。 Furthermore, the manufacturing method of the steel wire of the present invention has the following formula:
εf = 2ln (D0 / Df)
(In the formula, Df represents the final diameter of the steel wire obtained in the final wire drawing step, D0 represents the diameter of the heat-treated wire before the final wire drawing step, and ln is a natural logarithm). The wire drawing amount εf in the final wire drawing step is 2.50 to 3.10, preferably 2.60 to 3.00. When the drawing amount εf is less than 2.50, it is difficult to obtain a tensile strength desired as a rubber reinforcing wire or a rope wire. On the other hand, if the amount of wire drawing εf exceeds 3.10, the energy required for the final wire drawing increases, making it difficult to obtain an energy saving effect.
　鋼線の製造において消費されるエネルギーは、最終伸線工程に要する電力の割合が大きい。そのため、最終伸線工程における伸線加工量εｆを調整することにより、良好な引張り強さを有する鋼線を、少ない加工エネルギーにて製造できる。また、８０Ｃ材よりも炭素含有量の多い原材料を用いることにより、従来品と同等の引張強さを得るために最終伸線工程で必要とされる伸線加工量を小さくすることができ、製造に要するエネルギーを削減することができる。さらに、最終伸線加工量を小さくすることは、鋼線の延性向上にも有利であり、断線減少による生産性の向上、鋼線品質の向上といった付随効果も期待できる。 The energy consumed in the production of steel wire is large in the proportion of power required for the final wire drawing process. Therefore, by adjusting the wire drawing amount εf in the final wire drawing step, a steel wire having a good tensile strength can be manufactured with a small amount of processing energy. In addition, by using raw materials with a carbon content higher than that of 80C material, the amount of wire drawing required in the final wire drawing process to obtain the same tensile strength as that of the conventional product can be reduced. It is possible to reduce the energy required for this. Furthermore, reducing the final wire drawing amount is advantageous for improving the ductility of the steel wire, and can be expected to have accompanying effects such as an improvement in productivity due to a reduction in disconnection and an improvement in the quality of the steel wire.
　本発明の鋼線の製造方法においては、高炭素鋼線材の金属組織がパーライトであることが好ましい。パーライト鋼はマルテンサイト鋼よりも加工硬化率が大きいためである。 In the steel wire manufacturing method of the present invention, the metal structure of the high carbon steel wire is preferably pearlite. This is because pearlite steel has a higher work hardening rate than martensite steel.
　本発明の鋼線の製造方法は、最終伸線工程で得られる鋼線の直径を、０．０５～０．５０ｍｍとすることが好ましい。かかる範囲は、ゴム補強用やロープ用素線として望ましい直径範囲であり、良好な引張り強さを有する鋼線を、より少ない加工エネルギーにて製造できる。 In the steel wire manufacturing method of the present invention, the diameter of the steel wire obtained in the final wire drawing step is preferably 0.05 to 0.50 mm. This range is a desirable diameter range for rubber reinforcement and rope strands, and a steel wire having good tensile strength can be produced with less processing energy.
　また、本発明の鋼線の製造方法は、パーライト鋼において、最終伸線工程で得られる鋼線の引張り強さＴＳｆと、熱処理済み線材の引張り強さＴＳと、εｆとが次式、
ＴＳ×ｅｘｐ（０．２４×εｆ）≦ＴＳｆ≦ＴＳ×ｅｘｐ（０．３０×εｆ）
で表わされる関係を満足することが好ましく、より好ましくは、ＴＳｆは、２７００～３３００ＭＰａである。鋼線の引張り強さが、２７００ＭＰａ未満では、ゴム補強用やロープ用素線として強度が不足するおそれがあり、一方、鋼線の引張り強さが、３３００ＭＰａを超えると、炭素含有量を増やしても最終伸線工程での加工量を大きく設定する必要が有るので、省エネ効果が小さくなるおそれがあるからである。 Further, in the method for producing a steel wire of the present invention, in pearlite steel, the tensile strength TSf of the steel wire obtained in the final wire drawing step, the tensile strength TS of the heat-treated wire, and εf are expressed by the following equations:
TS × exp (0.24 × εf) ≦ TSf ≦ TS × exp (0.30 × εf)
It is preferable to satisfy the relationship represented by: TSf is more preferably 2700 to 3300 MPa. If the tensile strength of the steel wire is less than 2700 MPa, the strength may be insufficient as a strand for rubber reinforcement or rope. On the other hand, if the tensile strength of the steel wire exceeds 3300 MPa, the carbon content is increased. This is because it is necessary to set a large amount of processing in the final wire drawing process, which may reduce the energy saving effect.
　さらに、本発明の鋼線の製造方法は、０．９０～１．０５質量％の炭素を含有する高炭素鋼線材に伸線加工を施して中間線材とし、伸線加工量εｆを２．７０～３．０５とし、最終伸線工程で得られる鋼線の引張り強さを２７００～３２００ＭＰａとすることが好ましい。これにより、良好な引張り強さを有する鋼線を、より少ない加工エネルギーにて製造できる。また、高炭素鋼線材中に含有する炭素の量の上限を１．０５とすることにより、熱処理工程において均一な金属組織を得ることが容易となる。 Furthermore, in the method for producing a steel wire of the present invention, a high carbon steel wire containing 0.90 to 1.05% by mass of carbon is drawn to obtain an intermediate wire, and the drawing amount εf is 2.70. The tensile strength of the steel wire obtained in the final wire drawing step is preferably 2700 to 3200 MPa. Thereby, the steel wire which has favorable tensile strength can be manufactured with less processing energy. Moreover, it becomes easy to obtain a uniform metal structure in the heat treatment step by setting the upper limit of the amount of carbon contained in the high carbon steel wire to 1.05.
　本発明においては、高炭素鋼線材中の炭素含有量、伸線加工量εｆ、最終伸線工程で得られる鋼線の引張り強さのみが重要であり、それ以外の各工程における処理方法や処理条件等については、所望に応じ、常法に従い適宜行うことができ、特に制限されるものではない。 In the present invention, only the carbon content in the high carbon steel wire, the wire drawing amount εf, and the tensile strength of the steel wire obtained in the final wire drawing step are important. About conditions etc., it can carry out suitably according to a conventional method as desired, and it does not restrict | limit in particular.
　また、本発明の鋼線の製造方法は、ゴム物品補強用のスチールコードの素線や、ワイヤーロープの素線の製造等に用いることができる。 Also, the steel wire manufacturing method of the present invention can be used for manufacturing steel cord strands for reinforcing rubber articles, wire rope strands, and the like.
　以下に、実施例を挙げて本発明を更に詳しく説明するが、本発明は下記の実施例に何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.
（実施例１）
　直径５．５．ｍｍで１．０２質量％の炭素を含有する、高炭素鋼線材（１０２Ｃ材）に伸線加工を施して中間線材を作製した（前伸線工程）。前伸線工程は、中間熱処理を入れずに実施した。得られた中間線材にパテンティング熱処理を施して熱処理済み線材を作製した（熱処理工程、熱処理メッキ）。この熱処理済み線材に伸線加工を施して（最終伸線工程）、直径０．１９ｍｍ、引張強さＴＳｆが３０００ＭＰａの実施例１の鋼線を得た。なお、用いた高炭素鋼線材の金属組織はほぼ均一なパーライト組織である。 Example 1
Diameter 5.5. An intermediate wire was produced by drawing a high carbon steel wire (102C material) containing 1.02 mass% of carbon in mm (pre-drawing step). The pre-drawing step was performed without intermediate heat treatment. The obtained intermediate wire was subjected to patenting heat treatment to produce a heat-treated wire (heat treatment step, heat treatment plating). The heat treated wire was subjected to wire drawing (final wire drawing step) to obtain a steel wire of Example 1 having a diameter of 0.19 mm and a tensile strength TSf of 3000 MPa. The metal structure of the high carbon steel wire used is a substantially uniform pearlite structure.
　下記表１には、上記実施例１の製造条件を示すとともに、中間線材径（ｍｍ）、前伸線工程における伸線加工量ε、熱処理済み線材の引張強さ（ＴＳ、単位ＭＰａ）、最終伸線工程で得られた鋼線の最終直径（ｍｍ）、最終伸線工程における伸線加工量εｆおよび最終伸線工程で得られた鋼線の引張強さ（ＴＳｆ、単位ＭＰａ）を示した。また、表１中に、使用した原材料の炭素含有量（質量％）、直径（ｍｍ）および材料の略称を示した。なお、伸線加工量εは、次式、
　ε＝２ｌｎ（Ｄ１／Ｄ２）
（式中、Ｄ１は前伸線工程前の線材の直径を示し、Ｄ２は前伸線工程で得る中間線材の直径を示し、ｌｎは自然対数である）で表される。 Table 1 below shows the manufacturing conditions of Example 1, the intermediate wire diameter (mm), the amount of wire drawing ε in the previous wire drawing step, the tensile strength (TS, unit MPa) of the heat-treated wire, and the final The final diameter (mm) of the steel wire obtained in the wire drawing step, the drawing amount εf in the final wire drawing step, and the tensile strength (TSf, unit MPa) of the steel wire obtained in the final wire drawing step are shown. . Table 1 shows the carbon content (mass%), diameter (mm), and material abbreviations of the raw materials used. The wire drawing amount ε is expressed by the following equation:
ε = 2ln (D1 / D2)
(Where D1 represents the diameter of the wire before the pre-drawing step, D2 represents the diameter of the intermediate wire obtained in the pre-drawing step, and ln is a natural logarithm).
（実施例２）
　下記表１に示す製造条件にした以外は、実施例１と同様にして、直径０．１９ｍｍ、ＴＳｆが３０００ＭＰａの実施例２の鋼線を得た。 (Example 2)
A steel wire of Example 2 having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as Example 1 except that the production conditions shown in Table 1 were used.
（従来例）
　下記表１に示す製造条件にした以外は、実施例１と同様にして、直径０．１９ｍｍ、ＴＳｆが３０００ＭＰａの従来例の鋼線を得た。 (Conventional example)
A conventional steel wire having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as in Example 1 except that the production conditions shown in Table 1 were used.
（比較例１）
　下記表１に示す製造条件にした以外は、実施例１と同様にして、直径０．１９ｍｍ、ＴＳｆが３０００ＭＰａの比較例１の鋼線を得た。 (Comparative Example 1)
A steel wire of Comparative Example 1 having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as in Example 1 except that the production conditions shown in Table 1 were used.
（比較例２）
　従来例に示す製造条件を用いて、９０Ｃ材を加工して、直径０．１９ｍｍ、ＴＳｆが３３５０ＭＰａの比較例２の鋼線を得た。 (Comparative Example 2)
The 90C material was processed using the manufacturing conditions shown in the conventional example to obtain a steel wire of Comparative Example 2 having a diameter of 0.19 mm and a TSf of 3350 MPa.
（比較例３）
　下記表１に示す製造条件にした以外は、実施例１と同様にして、直径０．１９ｍｍ、ＴＳｆが３０００ＭＰａの比較例３の鋼線を得た。 (Comparative Example 3)
A steel wire of Comparative Example 3 having a diameter of 0.19 mm and a TSf of 3000 MPa was obtained in the same manner as in Example 1 except that the production conditions shown in Table 1 were used.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　実施例１、２、従来例および比較例１～３の鋼線１ｔ当たりを製造するのに必要な所要エネルギー（各工程および合計）を求めた。８０Ｃ材を用いた場合の総エネルギーを１０００とした指数で表示を使用して、結果を下記表２に示す。表２中、数値が小さいほど、所要エネルギーが少ないことを示す。 The required energy (each step and the total) required to manufacture per 1 ton of steel wire in Examples 1, 2, the conventional example and Comparative Examples 1 to 3 was determined. The results are shown in Table 2 below, using an indication with an index where the total energy when using 80C material is 1000. In Table 2, it shows that required energy is so small that a numerical value is small.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　従来例および比較例１～３では、最終伸線工程での所要エネルギーの割合が大きかったが、実施例１、２では、高炭素鋼材の最終伸線工程での所要エネルギーを削減できるので、製造に要するエネルギーが削減でき、良好な引張り強さを有する鋼線を、少ない加工エネルギーにて製造できた。また、上記では、直径０．１９ｍｍ、鋼線の引張強さが３０００及び３３５０ＭＰａの鋼線を例に挙げたが、直径あるいは鋼線の引張強さが異なる鋼線の製造においても、同様の効果を得ることができる。 In the conventional example and the comparative examples 1 to 3, the ratio of the required energy in the final wire drawing process was large. In Examples 1 and 2, the required energy in the final wire drawing process of the high carbon steel material can be reduced. The steel wire with good tensile strength can be produced with less processing energy. In the above, steel wires having a diameter of 0.19 mm and a steel wire having a tensile strength of 3000 and 3350 MPa are given as examples. However, the same effect can be obtained in the manufacture of steel wires having different diameters or tensile strengths of steel wires. Can be obtained.

Claims (6)

  1. 　０．９０～１．２０質量％の炭素を含有する高炭素鋼線材に伸線加工を施して中間線材とする前伸線工程と、この中間線材にパテンティング熱処理を施して熱処理済み線材とする熱処理工程と、この熱処理済み線材に伸線加工を施して鋼線を得る最終伸線工程とを含む鋼線の製造方法において、
    　次式、
    　εｆ＝２ｌｎ（Ｄ０／Ｄｆ）
    （式中、Ｄｆは最終伸線工程で得る鋼線の最終直径を示し、Ｄ０は最終伸線工程前の熱処理済み線材の直径を示し、ｌｎは自然対数である）で表される関係を満足する、最終伸線工程における伸線加工量εｆが、２．５０～３．１０であることを特徴とする鋼線の製造方法。     A pre-drawing process in which a high carbon steel wire containing 0.90 to 1.20% by mass of carbon is drawn into an intermediate wire, and a patenting heat treatment is applied to the intermediate wire to obtain a heat-treated wire. In a method of manufacturing a steel wire, including a heat treatment step and a final wire drawing step of obtaining a steel wire by drawing the heat-treated wire,
    The following formula,
    εf = 2ln (D0 / Df)
    (In the formula, Df represents the final diameter of the steel wire obtained in the final wire drawing step, D0 represents the diameter of the heat-treated wire before the final wire drawing step, and ln is a natural logarithm). The method of manufacturing a steel wire, wherein the wire drawing amount εf in the final wire drawing step is 2.50 to 3.10.
  2. 　前記高炭素鋼線材の金属組織がパーライトである請求項１記載の鋼線の製造方法。 The method for producing a steel wire according to claim 1, wherein the metal structure of the high carbon steel wire is pearlite.
  3. 　前記最終伸線工程で得られる鋼線の直径を、０．０５～０．５０ｍｍとする請求項１記載の鋼線の製造方法。 The method of manufacturing a steel wire according to claim 1, wherein the diameter of the steel wire obtained in the final wire drawing step is 0.05 to 0.50 mm.
  4. 　前記最終伸線工程で得られる鋼線の引張り強さＴＳｆと、前記熱処理済み線材の引張り強さＴＳと、前記εｆとが次式、
    ＴＳ×ｅｘｐ（０．２４×εｆ）≦ＴＳｆ≦ＴＳ×ｅｘｐ（０．３０×εｆ）
    で表わされる関係を満足する請求項２記載の鋼線の製造方法。     The tensile strength TSf of the steel wire obtained in the final wire drawing step, the tensile strength TS of the heat-treated wire, and the εf are expressed by the following equations:
    TS × exp (0.24 × εf) ≦ TSf ≦ TS × exp (0.30 × εf)
    The manufacturing method of the steel wire of Claim 2 which satisfies the relationship represented by these.
  5. 　前記ＴＳｆが、２７００～３３００ＭＰａである請求項４記載の鋼線の製造方法。 The method of manufacturing a steel wire according to claim 4, wherein the TSf is 2700 to 3300 MPa.
  6. 　０．９０～１．０５質量％の炭素を含有する高炭素鋼線材に伸線加工を施して中間線材とし、前記εｆを２．７０～３．０５とし、前記ＴＳｆを２７００～３２００ＭＰａとする請求項４または５記載の鋼線の製造方法。 A high carbon steel wire containing 0.90 to 1.05% by mass of carbon is drawn to form an intermediate wire, the εf is set to 2.70 to 3.05, and the TSf is set to 2700 to 3200 MPa. Item 6. The method for producing a steel wire according to Item 4 or 5.
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