EP2034036B1 - Wire rod having excellent wire drawability and its production method - Google Patents

Wire rod having excellent wire drawability and its production method Download PDF

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Publication number
EP2034036B1
EP2034036B1 EP08014230.0A EP08014230A EP2034036B1 EP 2034036 B1 EP2034036 B1 EP 2034036B1 EP 08014230 A EP08014230 A EP 08014230A EP 2034036 B1 EP2034036 B1 EP 2034036B1
Authority
EP
European Patent Office
Prior art keywords
wire
temperature
wire rod
tensile strength
drawability
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.)
Expired - Fee Related
Application number
EP08014230.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2034036A2 (en
EP2034036A3 (en
Inventor
Takuya Kochi
Tomotada Maruo
Masumi Nishimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of EP2034036A2 publication Critical patent/EP2034036A2/en
Publication of EP2034036A3 publication Critical patent/EP2034036A3/en
Application granted granted Critical
Publication of EP2034036B1 publication Critical patent/EP2034036B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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

Definitions

  • the present invention relates to a wire rod (hot rolled wire rod) which becomes a raw material for wire rod products such as steel cords, bead wires.
  • Steel cords, bead wires or the like are manufactured usually by wire drawing after descaling (mechanical descaling, acid washing treatment or the like, for example) the wire rod obtained by hot rolling of a billet with approximately 0.7-0.8% carbon content. If the wire rod is broken in wire drawing, productivity is impaired markedly, therefore excellent wire drawability is required for wire rods.
  • the present applicant previously proposed several techniques for improving wire drawability of wire rods.
  • Patent Document 1 JP-A-2004-137597 (Patent Document 1), a technique is disclosed where drawability is improved in wire drawing of the wire rod in an as-hot-rolled state, in addition to by stipulating the composition of the wire rod, by stipulating the average value of the tensile strength, the standard deviation of the tensile strength, the average value of the fracture drawing, and the standard deviation of the fracture drawing, of the wire rod.
  • Patent Document 2 JP-A-2005-206853 (Patent Document 2), a wire rod is proposed wherein a patenting treatment before or during wire drawing can be omitted and excellent wire drawing is possible in an as-hot-rolled state, in addition to by stipulating the composition of the wire rod, by stipulating the average tensile strength and the average lamellar spacing.
  • Patent Document 3 JP-A-2006-200039 (Patent Document 3), a wire rod is proposed wherein increase of wire drawing speed, increase of reduction ratio of area, and extension of the life time of a dice are possible, in addition to by stipulating the composition of the wire rod, by optimizing the metal structure (average crystal particle diameter and the maximum crystal particle diameter).
  • EP 1 674 588 A1 discloses a high carbon steel wire material having excellent wire drawability and manufacturing process thereof.
  • the present invention has been developed and its purpose is to provide a wire rod, whose tensile strength after wire drawing becomes more or less 3,000 MPa level, which does not cause wire breakage even if the wire drawing speed is increased, which does not shorten the life time of a dice, and whose wire drawability is improved.
  • Another purpose of the present invention is to provide a method for producing a wire rod excellent in wire drawability.
  • the wire rod according to claim 1 of the present invention addressing the aforementioned problems is the wire rod with the essential points of consisting of C: 0.65-0.75% (in mass%, hereafter the same with regard to the composition), Si: 0.1-0.5%, Mn: 0.1-0.6%, P: 0.015% or below (not including 0%), S: 0.015% or below (not including 0%), N: 0.004% or below (not including 0%), Al: 0.003% or below (not including 0%), O: 0.003% or below (not including 0%), optionally Cr: 0.5% or below (not including 0%), optionally Cu: 0.5% or below (not including 0%) the balance being iron and inevitable impurities, wherein tensile strength (TS) is 960 MPa or below, and reduction of area (RA) is 40% or above.
  • TS tensile strength
  • RA reduction of area
  • the wire rod of the present invention is be produced by going through a process for heating a billet satisfying the above composition at from 1,000 to 1,080 DEG C., a process for hot rolling of the heated billet with the lowest temperature during rolling being made at from 820 to 920 DEG C., a process for finish rolling of the wire rod obtained by the hot rolling at from 900 to 980 DEG C., a process for winding the wire rod obtained by the finish rolling at from 880 to 940 DEG C., a process for cooling the wound wire rod from the winding temperature to 800 DEG C. at average cooling rate (CR 1 ) of 10 DEG C./s or below, a process for cooling consecutively from 800 DEG C. to the temperature T 1 of 640-600 DEG C.
  • CR 1 average cooling rate
  • the tensile strength of the wire rod can be made 960 MPa or below and the reduction of area can be made 40% or above, accordingly, the wire drawing speed can be made higher than before in wire drawing of the wire rod, and shortening of the life time of the dice can be avoided.
  • the present inventors have made intensive investigations to improve wire drawability of the wire rod whose tensile strength becomes 3,000 MPa level in wire drawing. As a result, it was found out that wire rod drawability could be improved if the tensile strength of the hot rolled wire rod was made 960 MPa or below and the reduction of area was made 40% or above, and that, in order to make such tensile strength and reduction of area coexist, the composition of the hot rolled wire rod should be adjusted appropriately and the hot rolling condition and the cooling condition after hot rolling should be controlled appropriately, and the present invention was accomplished.
  • the hot rolled wire rod in accordance with the present invention consists of C: 0.65-0.75%, Si: 0.1-0.5%, Mn: 0.1-0.6%, P: 0.015% or less (not including 0%), S: 0.015% or below (not including 0%), N: 0.004% or below (not including 0%), Al: 0.003% or less (not including 0%), O: 0.003% or less (not including 0%), optionally Cr: 0.5% or below (not including 0%), optionally Cu: 0.5% or below (not including 0%) and the balance being iron and inevitable impurities.
  • C is the element necessary for securing the strength of wire rod products.
  • the purpose of the present invention is to provide the hot rolled wire rod which becomes the raw material of, among wire rod products, not the high strength product whose tensile strength is 3,500 MPa level, but the general product whose tensile strength is 3,000 MPa level.
  • C of the hot rolled wire rod is required to be made as much as possible in producing the high strength product, because production of the general product is envisaged in the present invention, C of the hot rolled wire rod is comparatively less than the case of production of high strength product, and is to be in the range of 0.65-0.75%.
  • C is made 0.65% or above, preferably 0.68% or above, or more preferably 0.7% or above.
  • C is made 0.75% or below, preferably 0.74% or below, or more preferably 0.73% or below.
  • Si is the element acting as a deoxidizing agent. If Si is below 0.1%, deoxidization is not enough, troubles in steel making become liable to occur, and wire drawability of wire rods is deteriorated as solid solution oxygen increases. Therefore, Si is required to be contained by 0.1% or above, preferably 0.13% or above, or more preferably 0.15% or above. On the other hand, Si increases the strength of the hot rolled wire rod by solid solution strengthening and has an action to promote decarburization. However, if Si becomes excessive, the tensile strength of the hot rolled wire rod becomes too high and wire breakage occurs in wire rod drawing. Therefore, Si is made 0.5% or below, preferably 0.48% or below, or more preferably 0.4% or below.
  • Mn not only acting as a deoxidizing agent, Mn also has an action to detoxify S by fixing S, a harmful element, as MnS. Also, Mn has an action to stabilize carbide in steel. However, if Mn is below 0.1%, detoxification of S becomes insufficient and drawability of wire rods is deteriorated. Further, crack possibly occurs in hot rolling. Therefore, Mn is required to be contained by 0.1% or above, preferably 0.13% or above, or more preferably 0.2% or above. However, if Mn becomes excessive, the tensile strength of the hot rolled wire rod becomes too high and wire breakage occurs in wire drawing. Also, segregation and super cooled structure are liable to occur which become the cause of wire breakage. Therefore, Mn is made 0.6% or below, preferably 0.58% or below, or more preferably 0.55% or below.
  • P is an inevitable impurity element, and if it is contained in excess, it deteriorates toughness and ductility of the hot rolled wire rod which becomes the cause of wire breakage in wire drawing. Therefore, P is made 0.015% or below, preferably 0.014% or below, more preferably 0.013% or below, further more preferably 0.010% or below.
  • S is an inevitable impurity element, is trapped by Mn and is fixed as MnS.
  • S is made 0.015% or below, preferably 0.013% or below, more preferably 0.01% or below, further more preferably 0.007% or below.
  • N is an inevitable impurity element, it is an element acting for improving tensile strength of the hot rolled wire rod by age hardening. However, if it is contained in excess, it deteriorates ductility of the hot rolled wire rod which becomes the cause of wire breakage in wire drawing. Therefore, N is made 0.004% or below, preferably 0.0035% or below, more preferably 0.003% or below, further more preferably 0.0025% or below, especially more preferably 0.002% or below.
  • Al is an element not only acting as a deoxidizing agent, but also acting to form AlN by combining with N, and to refine the structure and improve toughness of the hot rolled wire rod. To make these actions be exerted, it is preferable to contain 0.0001% or above, more preferably 0.0002% or above, further more preferably 0.0003% or above. However, if excessively contained, hard oxide (Al 2 O 3 or the like, for example) is formed in the hot rolled wire rod which becomes the cause of wire breakage in wire drawing. Therefore, Al is made 0.003% or below, preferably 0.002% or below, more preferably 0.001% or below.
  • O oxygen
  • Oxgen is an inevitable impurity element, and if O becomes excessive, coarse oxide-based inclusions are formed in the hot rolled wire rod which becomes the cause of wire breakage in wire drawing. Therefore, O is made 0.003% or below, preferably 0.0025% or below, more preferably 0.002% or below, further more preferably 0.0015% or below, most preferably 0.001% or below.
  • the hot rolled wire rod in accordance with the present invention contains the elements described above and the balance is iron and inevitable impurities.
  • the hot rolled wire rod in accordance with the present invention may contain (1) high strengthening elements such as Cr, and (2) anti-corrosion property improve elements such as Cu.
  • tensile strength (TS) is 960 MPa or below and reduction of area (RA) is 40% or above. If tensile strength (TS) exceeds 960 MPa, working heat quantity generated in wire drawing increases, seizure occurs during wire drawing, thereby the life time of a dice is shortened and wire breakage occurs. On the other hand, if reduction of area (RA) is below 40%, cuppy break becomes liable to occur during wire drawing.
  • the tensile strength and the reduction of area of the hot rolled wire rod in accordance with the present invention are obtained by cutting test pieces for tensile test from the wire rod obtained by hot rolling, measuring tensile strength (TS) and reduction of area (RA) on a plurality of test pieces (number of the test pieces is 80, for example) according to ordinary methods, and averaging them.
  • the strain rate in testing can be made 1.0 ⁇ 10 -3 s -1 to 3.5 ⁇ 10 -3 s -1 .
  • the hot rolled wire rod in accordance with the present invention described above can be produced by appropriately controlling the hot rolling condition and the cooling condition after hot rolling.
  • the hot rolling condition and the cooling condition after hot rolling are to be controlled to follow the heat pattern exhibited in FIG. 1 , and if
  • the present inventors consider that ferrite is formed by slow cooling in the range from the winding temperature to 800 DEG C., and metal structure is made finer by quick cooling in the range from 800 DEG C. to the temperature T 1 , thereby the tensile strength of hot rolled wire rod decreases, the reduction of area increases, and wire drawability can be improved.
  • the ultimate temperature T 1 in cooling from 800 DEG C. is made 640-600 DEG C., preferably 638 DEG C. or below, more preferably 635 DEG C. or below. Also, it is preferably 605 DEG C. or above, more preferably 610 DEG C, or above.
  • the hot rolled wire rod in accordance with the present invention thus obtained becomes excellent in wire drawability because the tensile strength becomes 960 MPa or below and the reduction of area becomes 40% or above.
  • a wire rod with tensile strength level of 3,000 MPa level can be obtained.
  • the billets (steel kinds of A1-A32) of the composition exhibited in TABLE 1 below were subjected to heating, hot rolling, winding and cooling according to the heat pattern exhibited in FIG. 1 , and the hot rolled wire rods of 5.5 mm diameter were produced.
  • TABLE 2 and TABLE 3 below exhibit; heating temperature, the lowest temperature during rolling, finish rolling temperature, winding temperature, average cooling rate from winding temperature to 800 DEG C. (CR 1 ), average cooling rate from 800 DEG C. to a temperature T 1 in the temperature range of 640-600 DEG C. (CR 2 ), temperature T 2 when heated from the temperature T 1 , respectively.
  • the tensile property was evaluated on the hot rolled wire rods obtained.
  • the evaluation of the tensile property was performed by preparing 8 test pieces for tensile test by dividing one ring (the length of one ring is approximately 4 m) of the hot rolled wire rod into 8 pieces, and by performing tensile tests using the test pieces for 10 rings (80 pieces in total).
  • the strain rate in the tensile test was set at 1.0 ⁇ 10 -3 s -1 to 3.5 ⁇ 10 -3 s -1 and tensile strength (TS: MPa) and reduction of area (RA: %) were measured. Average of all test pieces are referred to as tensile strength (TS) and reduction of area (RA) respectively, and the results are exhibited in TABLE 4 and TABLE 5 below.
  • FIG. 2 exhibits the relation between tensile strength (TS) and reduction of area (RA) exhibited in FIG. 2 .
  • ⁇ in FIG. 2 exhibits the results of Nos.1-5, No.8, Nos.10-14, No.21, Nos.26-33, Nos.38-40, No.46, No.47, and Nos.53-55.
  • ⁇ in FIG. 2 exhibits the results of No.6, No.7, No.9, No.15, Nos.22-25, Nos.34-37, Nos.41-45, Nos.49-52, and Nos.56-60.
  • wire drawability of the hot rolled wire rods obtained was evaluated. After descaling the 5.5 mm diameter hot rolled wire rod, dry drawing was performed so that the final wire diameter becomes 0.9 mm using a continuous drawing machine, and wire drawability was evaluated based on whether wire breakage had occurred or not in wire drawing and the life time of the dice.
  • the wire drawing conditions were as described below, and 2 tons for each hot rolled wire rod were used for the test. Whether or not wire breakage had occurred was visually confirmed. The life time of the dice was evaluated according to the criteria described below by visually observing the dice after drawing. The results are exhibited in TABLE 4 and TABLE 5 below.
  • wire drawability in the case wherein wire breakage did not occur and the life time of the dice passed in the evaluation when the final drawing speed was made 1,000 m/min, wire drawability was judged to be excellent, and in the case wherein wire breakage did not occur and the life time of the dice passed in the evaluation when the final drawing speed was made 1,100 m/min, wire drawability was judged to be particularly excellent.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Extraction Processes (AREA)
EP08014230.0A 2007-09-05 2008-08-08 Wire rod having excellent wire drawability and its production method Expired - Fee Related EP2034036B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007230713A JP5241178B2 (ja) 2007-09-05 2007-09-05 伸線加工性に優れた線材およびその製造方法

Publications (3)

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EP2034036A2 EP2034036A2 (en) 2009-03-11
EP2034036A3 EP2034036A3 (en) 2010-10-06
EP2034036B1 true EP2034036B1 (en) 2013-12-11

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EP (1) EP2034036B1 (ja)
JP (1) JP5241178B2 (ja)
KR (1) KR101050008B1 (ja)
CN (1) CN101381840B (ja)

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JP5297849B2 (ja) * 2009-03-23 2013-09-25 株式会社神戸製鋼所 伸線性に優れた高炭素鋼線材の製造方法
KR101309881B1 (ko) * 2009-11-03 2013-09-17 주식회사 포스코 신선가공성이 우수한 신선용 선재, 초고강도 강선 및 그 제조방법
US8859095B2 (en) 2009-11-05 2014-10-14 Nippon Steel & Sumitomo Metal Corporation High-carbon steel wire rod exhibiting excellent workability
KR101253822B1 (ko) 2010-05-06 2013-04-12 주식회사 포스코 초미세립 고강도 고인성 선재 및 그 제조방법
CN103882306B (zh) * 2012-12-21 2016-01-20 鞍钢股份有限公司 一种精细切割钢丝用盘条及其生产方法
WO2014208492A1 (ja) * 2013-06-24 2014-12-31 新日鐵住金株式会社 高炭素鋼線材及びその製造方法
JP6288264B2 (ja) * 2014-06-02 2018-03-07 新日鐵住金株式会社 鋼線材
JP6416709B2 (ja) 2015-07-21 2018-10-31 新日鐵住金株式会社 高強度ｐｃ鋼線
CN105483556B (zh) * 2015-12-24 2017-10-10 江苏兴达钢帘线股份有限公司 一种高强度胎圈钢丝材料强化方法及胎圈钢丝的制备方法

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EP1674588B1 (en) * 2004-12-22 2010-02-10 Kabushiki Kaisha Kobe Seiko Sho High carbon steel wire material having excellent wire drawability and manufacturing process thereof
JP2007002294A (ja) * 2005-06-23 2007-01-11 Kobe Steel Ltd 伸線性および疲労特性に優れた鋼線材並びにその製造方法

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Publication number Publication date
KR20090025158A (ko) 2009-03-10
JP5241178B2 (ja) 2013-07-17
CN101381840A (zh) 2009-03-11
CN101381840B (zh) 2011-09-14
JP2009062574A (ja) 2009-03-26
KR101050008B1 (ko) 2011-07-19
EP2034036A2 (en) 2009-03-11
EP2034036A3 (en) 2010-10-06

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