EP0486658B1 - Verfahren zur Herstellung von hochfestem hartgezogenem Stahldraht - Google Patents

Verfahren zur Herstellung von hochfestem hartgezogenem Stahldraht Download PDF

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Publication number
EP0486658B1
EP0486658B1 EP91911133A EP91911133A EP0486658B1 EP 0486658 B1 EP0486658 B1 EP 0486658B1 EP 91911133 A EP91911133 A EP 91911133A EP 91911133 A EP91911133 A EP 91911133A EP 0486658 B1 EP0486658 B1 EP 0486658B1
Authority
EP
European Patent Office
Prior art keywords
wire
steel
final
diameter
patenting
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 - Lifetime
Application number
EP91911133A
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English (en)
French (fr)
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EP0486658A1 (de
Inventor
Luc Peeters
Jean Bernard Pelletier
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.)
Sollac SA
Original Assignee
Sollac SA
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Filing date
Publication date
Application filed by Sollac SA filed Critical Sollac SA
Publication of EP0486658A1 publication Critical patent/EP0486658A1/de
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a process for obtaining a hardened steel wire, with high resistance, usable in particular for the manufacture of strands and cables for reinforcing elastomeric articles such as tires; it also relates to the reinforcing elements (strands and cables) made from wires obtained by such a process.
  • the first three stages can be replaced by a single wire drawing stage up to a diameter of approximately 1.35 to 1.80 mm.
  • Ordinary quality wires which have, for example, a typical breaking strength of 2850 MPa are obtained from a steel with 0.72% (+ 0.02) carbon with application of a reduction rate of final section from 95 to 96.5%.
  • the high resistance wires are obtained from a steel with 0.82% ( ⁇ 0.02) of carbon with application of a final reduction rate of between 96 and 97%, the latter value being in practice only very rarely affected. They have a breaking strength of up to 3200 to 3450 MPa.
  • this last grade of steel dangerously approaches the metal of a physical limit called "eutectoid point" beyond which fragile phases of proeutectoid cementite appear, making the wire drawing and especially the stranding almost impossible because of the high number of breaks .
  • This limit which depends on the diameter is higher the smaller the diameter, it is difficult to determine since a certain amount of wire can pass the axial deformation test during the drawing but not the deformation constraints imposed during assembly operations.
  • US patent no. 3617230 relates to a high-strength steel wire obtained both by a high carbon content: 0.9 to 1.1% and by the application of high work hardening rates in the final phase: more than 97%, these rates being made possible by the use of a steel with a low content of S ( ⁇ 0.010%) and P ( ⁇ 0.005%).
  • S ⁇ 0.010%
  • P ⁇ 0.005%
  • it is a steel wire which goes beyond the scope of the tire reinforcement application both by its use: piano wire and by its composition, in particular its carbon content which comes out of the usual range of steel for tire wires given at the beginning of the text.
  • the patent says nothing about the behavior of such a wire under bending or twisting constraints.
  • the final section reduction rate is between 97 and 98%.
  • the reduction rates of section are higher than those currently practiced, and this as said previously.
  • the wire obtained by implementing the process according to the invention is used to make strands, cables, and this under standard production conditions.
  • the high rate of section reduction in the final drawing step is made possible by the use of a steel grade conforming to the new composition selected, with an S and P content of less than 0.010% for each of these two. constituents.
  • the invention in addition to saving on the cost of steel (steel at 0.82% of C being expensive), the invention has an important technical advantage because a steel grade conforming to the new composition selected is easier to produce and allows a considerable reduction, even elimination of the risks of segregation caused by the presence of proeutectoid cementite which was encountered in steels of usual composition with a carbon content higher than 0.80% about. Such a shade, far from the eutectoid point, better withstands the stresses of traction, folding and torsion. This results in a reduction in wire drawing and stranding breaks and an improvement in productivity.
  • the claimed process and for relatively small final diameters, it is possible to obtain the wire according to the invention from a machine wire of current diameter 5.5 mm in only two drawing steps (instead of three ), and a single patenting treatment (instead of two), that associated with brass plating. This applies to ordinary quality wire as well as to high resistance wire.
  • the properties of the wires resistance, elongation, necking are measured by means of the usual dynamometry tests.
  • the folding and twisting properties are measured according to ISO 7801 and ISO 7800 standards respectively.
  • the steel grades are defined by the contents of C, Mn, Si, P, S on the understanding that the contents for the other components: Al, Ni, Cu, Cr, Mo, Co, N comply with the values given in the general definition of the wire.
  • This example illustrates the manufacture of a standard (ordinary) quality wire by the method according to the invention compared to a wire manufactured by the usual method.
  • the wire according to the invention is produced from a steel of composition A: in accordance with the composition selected for the invention: 0.64% C, 0.55% Mn, 0.20% Si, 0.008% P, 0.008% S.
  • the current wire is made from a steel of current composition B: 0.72% C, 0.60% Mn, 0.22% Si, 0.015% P, 0.012% S.
  • the starting wire rod for the two compositions A and B has a diameter of 5.5 mm.
  • the machine wire of composition A is drawn directly from the diameter 5.5 mm to the diameter 1.30 mm with the application of a cross-section reduction rate of 94.4%, made possible by the composition of the steel and in particular the low S and P content
  • the machine wire of composition B is drawn by 5.5 mm with an intermediate diameter of 3.0 mm, then it undergoes an intermediate patenting before being drawn with the final diameter of 1.15 mm. Finally, the two sons are patented for brass plating under standard conditions.
  • the fine wire drawing is carried out in a humid environment to obtain the 0.22 mm diameter with standard resistance (ordinary quality).
  • wire A and B are completely interchangeable in terms of their use.
  • the wire A according to the invention also has the advantage of eliminating the intermediate patenting operation and a drawing step.
  • the present invention it is therefore possible to obtain the finished wire (diameter 0.22 to 0.25 mm for example) in two drawing stages only, with a single heat treatment, this from a machine wire of standard diameter of 5.5 mm, i.e. at no additional cost.
  • This example illustrates the implementation of the invention in its most advantageous form. It relates to the manufacture of a high resistance wire, by the method according to the invention, compared to a wire produced by the usual method.
  • the wire according to the invention is produced from a steel of composition Al, in accordance with the composition selected for the invention: 0.72% C, 0.54% Mn, 0.23% Si, 0.007% P, 0.006% S.
  • the wire manufactured by the usual process is made of a steel of composition Bl: 0.82% C, 0.55% Mn, 0.25% Si, 0.005% P, 0.009% S.
  • This wire although having a content of S and P of less than 0.01% for each of these components is not made of a steel of composition in accordance with that selected for the invention. It can not withstand high rates of section reduction because of its C and Mn content, it dangerously approaches the eutectoid point with the associated risks.
  • the starting wire rod for the two compositions Al and Bl has a diameter of 5.5 mm.
  • the machine wire of composition Al is drawn directly from 5.5 mm to the final diameter of 1.48 mm (section reduction rate: 92.75%).
  • the machine wire of composition Bl undergoes an intermediate patenting with a diameter of 3.0 mm before being drawn to a diameter of 1.30 mm. Then the two sons undergo patenting for brass plating under standard conditions; the mechanical properties of these are: STEEL ⁇ (mm) RESISTANCE (MPa) ELONGATION% STRICTION% BENDS TORSIONS Al 1.48 1260 9.2 54.0 18 60 Bl 1.30 1350 8.8 48.4 14 53
  • the fine wire drawing is carried out in a humid environment in order to obtain the 0.25 mm high resistance product. Breakage rates are low and identical for the two sons.
  • the threads have the following characteristics: STEEL FINAL SECTION REDUCTION (%) RESISTANCE (MPa) ELONGATION% BENDS TORSIONS Al 97.15 3250 2.5 80 110 Bl 96.30 3270 2.6 84 107
  • the two wires have practically identical characteristics and are therefore interchangeable as regards their uses.
  • the stranding behavior of the wire A1 according to the invention is good, the breakage rate even being reduced compared to the wire Bl.
  • this wire offers the advantage of eliminating the intermediate patenting as well as a wire drawing step. Above all, it avoids the use of wire rod with 0.82% carbon which not only presents an additional cost on purchase, but also risks of fragile phases (proeutectoid cementite) causing breaks in wire drawing and stranding despite all the precautions that can be taken, these breakages causing a reduction in productivity.
  • This example illustrates the production of wires of small diameters such as 0.175 mm with high resistance and 0.150 mm of current quality by implementing very high reduction rates of section (97.5% to 98%) while having an aptitude for correct stranding and with an acceptable breakage rate, these wires being used in particular in the production of products such as the compact cables 1 x 27 and 1 x 12 (all the wires being twisted together in the same direction and with the same pitch) .
  • the intermediate wires come from the patented 3.0 mm diameter. After dry drawing, a classic brassage patenting is carried out, resulting in the following mechanical properties: STEEL ⁇ (min) RESISTANCE after patenting (MPa) ELONGATION (%) STRICTION (%) BENDS TORSIONS A2 1.19 1265 9.0 53.0 26 75 A3 1.04 1080 9.8 60.4 30 80
  • the wire A2 gives the diameter 0.175 mm high resistance used in particular for stranding for construction 1 x 27.
  • the wire A3 is transformed up to the diameter 0.15 mm used as covering wire.
  • the mechanical properties of these fine wires are: STEEL SECTION REDUCTION (%) ⁇ (mm) RESISTANCE (MPa) ELONGATION (%) BENDS TORSIONS A2 97.84 0.175 3440 2.6 129 145 A3 97.92 0.150 2915 2.3 131 174
  • the cable produced without any particular problem from the A2 wire wrapped with the A3 wire has a resistance comparable or even greater than that of the cables produced from the usual wires with 0.82% carbon. In all cases the other properties of the cable, such as fatigue, adhesion (at the origin and after aging), remain unchanged.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Ropes Or Cables (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Steel (AREA)
  • Wire Processing (AREA)

Claims (3)

  1. Verfahren zur Herstellung von hochfestem hartgezogenem Stahldraht durch Drahtziehen eines Rohmaterials mit gegebenenfalls zwischengeschalteter Wärmebehandlung und Oberflächenbehandlung, wobei das Rohmaterial aus einem Stahl besteht, dessen Struktur frei von voreutektoidischem Zementit ist und dessen chemische Zusammensetzung außer dem Eisen folgende Stoffe umfaßt:
    - C: 0,45 - 0,67 %;
    - Mn, Si, Ca, Mo, Al... in gebräuchlichem Gehalt;
       und bei dem:
    - die Stahlsorte des Rohmaterials unter den Stählen ausgewählt wird, deren Gehalt an S und P unter 0,010 % liegt;
    - der Vorgang des Drahtziehens in zwei deutlich getrennten Phasen erfolgt, zwischen denen eine Patentier- und Messingbehandlung erfolgt;
    - der Grad der Querschnittsverringerung in der letzten Stufe des Drahtziehens mehr als 97 % beträgt. Die Endbruchfestigkeit des hergestellten Drahtes liegt zwischen 2 400 und 3 000 MPa.
  2. Verfahren zur Herstellung von hochfestem hartgezogenem Stahldraht durch Drahtziehen eines Rohmaterials mit gegebenenfalls zwischengeschalteter Wärmebehandlung und Oberflächenbehandlung, wobei das Rohmaterial aus einem Stahl besteht, dessen Struktur frei von voreutektoidischem Zementit ist und dessen chemische Zusammensetzung außer dem Eisen folgende Stoffe umfaßt:
    - C: 0,68 - 0,75 %;
    - Mn, Si, Ca, Mo, Al... in gebräuchlichem Gehalt;
       und bei dem:
    - die Stahlsorte des Rohmaterials unter den Stählen ausgewählt wird, deren Gehalt an S und P unter 0,010 % liegt;
    - der Vorgang des Drahtziehens in zwei deutlich getrennten Phasen erfolgt, zwischen denen eine Patentier- und Messingbehandlung erfolgt;
    - der Grad der Querschnittsverringerung in der letzten Stufe des Drahtziehens mehr als 97 % beträgt. Die Endbruchfestigkeit des hergestellten Drahtes liegt zwischen 3 000 und 3 500 MPa.
  3. Kabel, Litzen und ähnliche Artikel aus Stahldrähten, die durch das Verfahren nach einem der beiden Patentansprüche 1 und 2 hergestellt werden.
EP91911133A 1990-06-07 1991-06-06 Verfahren zur Herstellung von hochfestem hartgezogenem Stahldraht Expired - Lifetime EP0486658B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9007311A FR2663041B1 (fr) 1990-06-07 1990-06-07 Fil d'acier ecroui a resistance elevee.
FR9007311 1990-06-07
PCT/FR1991/000446 WO1991019014A1 (fr) 1990-06-07 1991-06-06 Procede pour l'obtention d'un fil d'acier ecroui a resistance elevee

Publications (2)

Publication Number Publication Date
EP0486658A1 EP0486658A1 (de) 1992-05-27
EP0486658B1 true EP0486658B1 (de) 1995-01-25

Family

ID=9397529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91911133A Expired - Lifetime EP0486658B1 (de) 1990-06-07 1991-06-06 Verfahren zur Herstellung von hochfestem hartgezogenem Stahldraht

Country Status (10)

Country Link
US (1) US5213632A (de)
EP (1) EP0486658B1 (de)
JP (1) JPH05500689A (de)
KR (1) KR920702426A (de)
AT (1) ATE117733T1 (de)
BR (1) BR9105797A (de)
CA (1) CA2059631A1 (de)
DE (1) DE69107022D1 (de)
FR (1) FR2663041B1 (de)
WO (1) WO1991019014A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711149A1 (fr) 1993-10-15 1995-04-21 Michelin & Cie Fil en acier inoxydable pour carcasse d'enveloppe de pneumatique.
JP4788861B2 (ja) * 2003-11-28 2011-10-05 ヤマハ株式会社 楽器弦用鋼線およびその製造方法
CN104451413A (zh) * 2014-12-19 2015-03-25 重庆钢铁股份有限公司 一种硬线钢盘条

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617230A (en) * 1969-04-09 1971-11-02 United States Steel Corp High-strength steel wire
FR2315545A1 (fr) * 1975-06-27 1977-01-21 Inst Chernykh Metallov Acier pour corde metallique
GB1565066A (en) * 1976-09-07 1980-04-16 Dunlop Ltd Steel cords
JPS53131219A (en) * 1977-04-22 1978-11-15 Sumitomo Electric Ind Ltd Heat treating method for high carbon steel wire
GB8332395D0 (en) * 1983-12-05 1984-01-11 Bekaert Sa Nv Steel wires
GB8417468D0 (en) * 1984-07-09 1984-08-15 Bekaert Sa Nv Carbon steel wire
JPS61261430A (ja) * 1985-05-14 1986-11-19 Shinko Kosen Kogyo Kk 高強度高靭性鋼線の製造方法
GB8600533D0 (en) * 1986-01-10 1986-02-19 Bekaert Sa Nv Manufacturing pearlitic steel wire
ES2028252T3 (es) * 1987-05-20 1992-07-01 N.V. Bekaert S.A. Revestimiento intermedio de alambre de acero.

Also Published As

Publication number Publication date
KR920702426A (ko) 1992-09-04
WO1991019014A1 (fr) 1991-12-12
FR2663041A1 (fr) 1991-12-13
DE69107022D1 (de) 1995-03-09
EP0486658A1 (de) 1992-05-27
BR9105797A (pt) 1992-09-08
FR2663041B1 (fr) 1994-04-01
US5213632A (en) 1993-05-25
JPH05500689A (ja) 1993-02-12
CA2059631A1 (fr) 1991-12-08
ATE117733T1 (de) 1995-02-15

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