EP0199715A2 - Procédé de fabrication de fil d'acier - Google Patents

Procédé de fabrication de fil d'acier Download PDF

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Publication number
EP0199715A2
EP0199715A2 EP86890113A EP86890113A EP0199715A2 EP 0199715 A2 EP0199715 A2 EP 0199715A2 EP 86890113 A EP86890113 A EP 86890113A EP 86890113 A EP86890113 A EP 86890113A EP 0199715 A2 EP0199715 A2 EP 0199715A2
Authority
EP
European Patent Office
Prior art keywords
deformation
temperature
wire
treatment temperature
steel wire
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.)
Withdrawn
Application number
EP86890113A
Other languages
German (de)
English (en)
Other versions
EP0199715A3 (fr
Inventor
Ernst Dipl.-Ing. Siegmund
Ernst Dipl.-Ing. Hojas
Günter Dipl.-Ing. Hampejs
Helmut Eggenreich
Erwin Kraushofer
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.)
Voestalpine Wire Rod Austria GmbH
Original Assignee
Voestalpine Wire Rod Austria GmbH
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 Voestalpine Wire Rod Austria GmbH filed Critical Voestalpine Wire Rod Austria GmbH
Publication of EP0199715A2 publication Critical patent/EP0199715A2/fr
Publication of EP0199715A3 publication Critical patent/EP0199715A3/fr
Withdrawn legal-status Critical Current

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    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires

Definitions

  • the invention relates to a method for producing steel wire with high tensile strength and low creep and relaxation properties, in which the steel wire is subjected to deformation and heat treatment.
  • Steel wires with low reiaxation properties have hitherto been produced by cold working, for example by drawing or rolling. This is followed by heat treatment under tensile stress, depending on the steel grade selected, at temperatures between 200 and 600 ° C and cooling to room temperature.
  • the invention now aims to achieve this. to produce a cold-formed steel wire with high tensile strength and particularly low creep and relaxation properties and to work with this method in addition to ensuring the high strength values with as little energy expenditure as possible.
  • the invention essentially consists in that the steel wire is heated to a temperature lower than the temperature required for the heat treatment, which plus the heat of deformation with a deformation of up to 50% decrease in cross-section, the desired treatment temperature before entering the last deformation step results, and that after this deformation, the steel wire is stretched at the treatment temperature.
  • the cooling then takes place in a known manner by means of suitable cooling units. It is shown that when the process is carried out in this way, in addition to achieving particularly low creep and relaxation properties and in addition to saving energy, a higher tensile strength of the end product produced can be observed in comparison with conventionally produced products.
  • the tensile forces required for the deformation are used for stretching at the treatment temperature.
  • the temperature increase resulting from the heat of deformation in the last deformation stage depends on the degree of deformation of this last stage and on the diameter of the drawn wire. Taking these parameters into account, it has proven to be particularly advantageous within the scope of the method according to the invention to carry out the heat treatment at temperatures between 200 ° C. and the recrystallization temperature of the steel, in particular between 250 ° C. and 600 ° C., and the heating before the last deformation step in the If drawing dies are used at temperatures from 30 to 100 ° C. below the desired treatment temperature and in the case of using rollers before the last roll pass to temperatures of 30 to 80 ° G below the desired treatment temperature.
  • the method according to the invention is particularly suitable for the production of steel wires, in particular prestressed concrete wires, and can advantageously also be used for spring steel wires and high-strength steel cable wires.
  • a major advantage of the process control according to the invention is that the wire does not have to be heated to the full treatment temperature and a small amount of force is additionally required for drawing. This results in a large saving in energy expenditure. When using this method, good results were achieved in a particularly simple manner in relation to the low relaxation of the steel wires and an extraordinarily large increase in tensile strength in the last deformation step.
  • the deformation is preferably carried out with a 10 to 40% decrease in cross-section, the corresponding temperature being added to the treatment temperature.
  • the method according to the invention is advantageously suitable for unalloyed steel grades with 0.30 to 1.20% by weight of carbon or alloyed steels with up to 5% by weight of manganese and up to 3% by weight of silicon.
  • FIG. 2 a modified arrangement analogous to FIG. 1 using a roll stand.
  • 1 denotes the steel wire to be processed, preferably already cold-formed, which is subjected to heating at 2 to a temperature which is lower than the temperature required for the treatment.
  • 3 the last deformation stage is designated with one or more drawing dies. 3 follows a cooling device 4, in which the steel wire is cooled in a suitable manner. The cooled wire is fed to a device 5. In this device 5, the tensile force required for the deformation of the wire is brought up. In the distance between 3 and 4, this tensile force causes the wire to stretch at the treatment temperature.
  • the pre-rolled, preferably already cold-formed, wire is designated by 1.
  • the heating unit 2 is arranged before the last deformation stage in the form of a roller pass.
  • the rolling process by non-driven rolls is indicated schematically by the roll stand 6.
  • cooling takes place in an analog cooling device 4, as has already been shown in FIG. A device 5 is then again provided.
  • a preferred wire with a diameter of 8.1 mm was heated to a temperature of 320 ° C. before entering the last drawing die. At this temperature, the diameter was subsequently drawn to 7.0 mm, an increase in temperature from 80 ° C. starting from 320 ° to 400 ° C. being observed.
  • the wire consisted of unalloyed steel with a carbon content of 0.83% by weight and a manganese content of 0.66% by weight. After the treatment according to the invention, a tensile strength of 1850 N / mm 2 was found. Before the treatment, the wire had a tensile strength of 1630 N / mm 2 .
  • the relaxation test of the material treated according to the invention under an initial load of 70% of the breaking load showed a voltage drop of 0.95% after 1000 hours.
  • a treatment according to the prior art was carried out with the same starting material, drawn wire with a diameter of 8.1 mm and a tensile strength of 1630 N / mm 2 .
  • the wire was drawn in the usual way and then subjected to the treatment temperature, after which a tensile strength of 1740 N / mm 2 was established.
  • a pre-drawn wire with a diameter of 14 mm was used. It was an unalloyed steel with a carbon content of 0.78% by weight and a manganese content of 0.75% by weight.
  • the wire was heated to a temperature of 400 ° C. During the rolling process by drag rolling, the temperature rose by a further 45 ° C to 445 ° C. The tensile strength measured after this treatment and cooling was 1690 N / mm 2 .
  • the relaxation test showed a voltage drop of 1.2% after 1000 hours, measured on the initial load of 70% of the breaking load.
  • treatment temperatures between 200 ° C. and the recrystallization temperature of the steel are used in the process according to the invention, deformations of up to 50% reduction in cross section, preferably 10 to 35%, being used.
  • the method according to the invention is primarily suitable for the treatment of unalloyed steel types with 0.30 to 1.20% by weight of carbon or for alloyed steels with up to 5% by weight of manganese and up to 3% by weight of silicon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)
EP86890113A 1985-04-26 1986-04-24 Procédé de fabrication de fil d'acier Withdrawn EP0199715A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1264/85 1985-04-26
AT126485A AT384564B (de) 1985-04-26 1985-04-26 Verfahren zur herstellung von stahldraht

Publications (2)

Publication Number Publication Date
EP0199715A2 true EP0199715A2 (fr) 1986-10-29
EP0199715A3 EP0199715A3 (fr) 1987-09-30

Family

ID=3510124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890113A Withdrawn EP0199715A3 (fr) 1985-04-26 1986-04-24 Procédé de fabrication de fil d'acier

Country Status (2)

Country Link
EP (1) EP0199715A3 (fr)
AT (1) AT384564B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6165292A (en) * 1990-12-18 2000-12-26 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US6508754B1 (en) 1997-09-23 2003-01-21 Interventional Therapies Source wire for radiation treatment
US6602228B2 (en) 1992-12-22 2003-08-05 Advanced Cardiovascular Systems, Inc. Method of soldering Ti containing alloys
US6682608B2 (en) 1990-12-18 2004-01-27 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US7918011B2 (en) 2000-12-27 2011-04-05 Abbott Cardiovascular Systems, Inc. Method for providing radiopaque nitinol alloys for medical devices
US7938843B2 (en) 2000-11-02 2011-05-10 Abbott Cardiovascular Systems Inc. Devices configured from heat shaped, strain hardened nickel-titanium
US7942892B2 (en) 2003-05-01 2011-05-17 Abbott Cardiovascular Systems Inc. Radiopaque nitinol embolic protection frame
US7976648B1 (en) 2000-11-02 2011-07-12 Abbott Cardiovascular Systems Inc. Heat treatment for cold worked nitinol to impart a shape setting capability without eventually developing stress-induced martensite

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT32609B (de) * 1904-10-24 1908-04-10 Iroquois Machine Co Fa Verfahren zur Verhinderung des Hartziehens des Drahtes beim Ziehen von Stahldraht u. dgl. durch eine Reihe von Zieheisen in einem Zuge.
DE1003246B (de) * 1952-03-28 1957-02-28 Tuyaux Bonna Verfahren bei der Herstellung von Gegenstaenden mit kreisfoermigem Querschnitt aus Beton mit vorgespannter Stahlbewehrung aus schraubenlinienfoermig um den Gegenstand gewickeltem Draht und Vorrichtung zur Ausuebung des Verfahrens
DE1758582A1 (de) * 1967-07-19 1971-03-11 Bekaert Sa Nv Waermebehandlung von Stahl
BE757142A (nl) * 1969-10-21 1971-03-16 Bekaert Sa Nv Werkwijze voor het thermomechanisch behandelen van een werkstuk, alsmede wapeningselement voor voorgespannen beton en voortbrengsel uit voorgespannen beton
GB2088258B (en) * 1980-11-08 1985-04-03 Sumitomo Metal Ind Making high tensile steel wires
JPS57198211A (en) * 1981-05-29 1982-12-04 Sumitomo Electric Ind Ltd Manufacture of heat treat pc steel rod

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6682608B2 (en) 1990-12-18 2004-01-27 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US6461453B1 (en) 1990-12-18 2002-10-08 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US6592570B2 (en) 1990-12-18 2003-07-15 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US6638372B1 (en) 1990-12-18 2003-10-28 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US6165292A (en) * 1990-12-18 2000-12-26 Advanced Cardiovascular Systems, Inc. Superelastic guiding member
US7244319B2 (en) 1990-12-18 2007-07-17 Abbott Cardiovascular Systems Inc. Superelastic guiding member
US7258753B2 (en) 1990-12-18 2007-08-21 Abbott Cardiovascular Systems Inc. Superelastic guiding member
US6602228B2 (en) 1992-12-22 2003-08-05 Advanced Cardiovascular Systems, Inc. Method of soldering Ti containing alloys
US6508754B1 (en) 1997-09-23 2003-01-21 Interventional Therapies Source wire for radiation treatment
US7938843B2 (en) 2000-11-02 2011-05-10 Abbott Cardiovascular Systems Inc. Devices configured from heat shaped, strain hardened nickel-titanium
US7976648B1 (en) 2000-11-02 2011-07-12 Abbott Cardiovascular Systems Inc. Heat treatment for cold worked nitinol to impart a shape setting capability without eventually developing stress-induced martensite
US7918011B2 (en) 2000-12-27 2011-04-05 Abbott Cardiovascular Systems, Inc. Method for providing radiopaque nitinol alloys for medical devices
US7942892B2 (en) 2003-05-01 2011-05-17 Abbott Cardiovascular Systems Inc. Radiopaque nitinol embolic protection frame

Also Published As

Publication number Publication date
AT384564B (de) 1987-12-10
EP0199715A3 (fr) 1987-09-30
ATA126485A (de) 1987-05-15

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Inventor name: SIEGMUND, ERNST, DIPL.-ING.

Inventor name: KRAUSHOFER, ERWIN

Inventor name: HOJAS, ERNST, DIPL.-ING.

Inventor name: HAMPEJS, GUENTER, DIPL.-ING.

Inventor name: EGGENREICH, HELMUT