EP0062239A1 - Procédé et dispositif de recuit et de trempe au défile pour éléments métalliques allongés en aciers fins ou spéciaux - Google Patents

Procédé et dispositif de recuit et de trempe au défile pour éléments métalliques allongés en aciers fins ou spéciaux Download PDF

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Publication number
EP0062239A1
EP0062239A1 EP82102470A EP82102470A EP0062239A1 EP 0062239 A1 EP0062239 A1 EP 0062239A1 EP 82102470 A EP82102470 A EP 82102470A EP 82102470 A EP82102470 A EP 82102470A EP 0062239 A1 EP0062239 A1 EP 0062239A1
Authority
EP
European Patent Office
Prior art keywords
annealing
quenching
austenitic structure
elements
fine
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Withdrawn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
EP82102470A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Claude Bourget
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.)
Cables de Lyon SA
Original Assignee
Cables de Lyon SA
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 Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of EP0062239A1 publication Critical patent/EP0062239A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/004—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing rigid-tube cables
    • 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
    • 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
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum

Definitions

  • the present invention relates to a process of annealing and quenching in the process for elongated metal elements made of fine or special steels with an austenitic structure, comprising at least one annealing operation by external heat supply under a reducing or neutral atmosphere, and a quenching operation by contact with circulation of a coolant. It applies more particularly to the annealing and quenching in the process of shielded electrical elements comprising at least one conductive core, a coating with mineral insulator and an outer sheath of fine or special steel with an austenitic structure.
  • Document FR - A No. 2,227,332 of the Applicant describes a heat treatment process for shielded electrical elements with mineral insulation in a stainless steel sheath, between two successive draws of the elements from a blank, which is carried out at parade of the blank and breaks down into three consecutive phases, the annealing of the sheaths, by high-frequency heating, the annealing of the cores of the cable in a thermally controlled enclosure, with heat transmission from the sheaths to the cores and possibly addition additional heat, and quenching of the sheaths and of the cores by a circulation of water in contact with the sheaths.
  • Such a process which is well suited for the annealing and quenching of elongated metallic elements in a steel with a well defined austenitic structure, is difficult to adapt to the annealing and quenching of metallic elements in different grades of structural steel austenitic, or of variable diameter and thickness. It has sometimes been found that the steel is not sufficiently hardened, leading to the appearance at certain points of ferritic structures or that of abnormal magnifications of the crystals, reducing the mechanical characteristics and possibly causing breakage during subsequent mechanical treatments.
  • the present invention aims to remedy these drawbacks, and to provide a method and a device for annealing and quenching such elongated metal elements, which is easy to adjust according to the grade of steel, its diameter and thickness, and which avoids any danger of the appearance of a ferritic structure or crystals of abnormal size.
  • the method according to the invention is characterized in that the flow rate and the temperature of the cooling fluid are adjusted so that the elements do not undergo any transformation of their austenitic structure during their quenching.
  • the Joule effect is preferably provided with external heat.
  • shielded electrical elements comprising at least one conductive core, a coating with mineral insulation and an outer sheath of fine or special steel with an austenitic structure, the annealing of the sheath and soul.
  • the device of the invention comprising a longitudinal block for each elongated metal element, at least one oven. annealing in a reducing or neutral atmosphere and a quenching device in contact with a coolant circuit, is characterized in that this circuit comprises means for controlling the inlet temperature and the flow rate of the coolant such as the elements elongated metals do not undergo any transformation of their austenitic structure during quenching.
  • the device preferably comprises a single furnace of simultaneous annealing of the sheath and of the core with resistance external to the mittens. These are advantageously arranged perpendicular to the running direction of the elongated metal elements, and parallel to each other.
  • Particularly suitable resistors are constituted by bars of silicon carbide.
  • the blanks of shielded electrical elements such as 1, 2, 3, 4, drawn by rollers of rollers such as 24, penetrate at the entrance of the annealing furnace 9 in mittens such as 5, 6, 7, 8.
  • the oven enclosure has not been shown for clarity, and we see the heat resistant bars 10, 11, 12, 13, 14 arranged on the roof of the oven, and perpendicular to the direction of travel of the blanks. This arrangement ensures great uniformity in the heating of the blanks. It also makes it possible to change a defective heating bar during operation. Hydrogen intended to form a reducing atmosphere is introduced into the tubes at the outlet of the annealing furnace by fittings such as 15, only one being shown.
  • the hydrogen flows counter-current to the electrical elements, because the circulation of water in the quenching device prevents its flow in the other direction. It comes to escape at the other end, where it is burned (flame 15A). It could of course, if necessary, be recovered and recycled.
  • the muffles 5, 6, 7, 8 are connected to the muffles 17, 18, 19, 20 of the quenching apparatus 16 by seals 17A, 18A, 19A, 20A. These muffles are supplied with cooling water at their two ends by injectors schematically represented at 21, 22 for the muffle 20.
  • Each injector such as that described and represented in document FR-A No. 2,227,332 has the role of controlling the temperature and the flow rate of the cooling fluid by causing it to penetrate into each muffle with a certain speed, the two jets being directed towards the middle of each muffle in the opposite direction from each other and the coolant flowing towards the middle where it forms a water seal and is evacuated by a conduit such as 23.
  • the sheath cools abruptly on contact with the cooling water.
  • the soul cools down more slowly.
  • the length of the quenching device is such that the core is also brought to a temperature close to ambient at its exit.
  • the blank is then ready either for a new drawing operation, or to be delivered as is.
  • the present invention also extends to annealing and passing quenching for tubes, bars or profiles made of fine or special steels requiring hyper-quenching after annealing, to avoid, for example, the formation of sigma phase.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP82102470A 1981-03-31 1982-03-25 Procédé et dispositif de recuit et de trempe au défile pour éléments métalliques allongés en aciers fins ou spéciaux Withdrawn EP0062239A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8106443 1981-03-31
FR8106443A FR2503187A1 (fr) 1981-03-31 1981-03-31 Procede et dispositif de recuit et de trempe au defile pour elements metalliques allonges en aciers fins ou speciaux

Publications (1)

Publication Number Publication Date
EP0062239A1 true EP0062239A1 (fr) 1982-10-13

Family

ID=9256827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102470A Withdrawn EP0062239A1 (fr) 1981-03-31 1982-03-25 Procédé et dispositif de recuit et de trempe au défile pour éléments métalliques allongés en aciers fins ou spéciaux

Country Status (5)

Country Link
US (2) US4461658A (enrdf_load_stackoverflow)
EP (1) EP0062239A1 (enrdf_load_stackoverflow)
AU (1) AU8218682A (enrdf_load_stackoverflow)
CA (1) CA1184029A (enrdf_load_stackoverflow)
FR (1) FR2503187A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1266602A (en) * 1985-07-25 1990-03-13 Kuniaki Sato Method and apparatus for cooling steel strips

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR814809A (fr) * 1936-12-11 1937-06-30 Birmingham Electr Furnaces Ltd Procédé et appareil pour le traitement thermique de métaux
FR1467814A (fr) * 1965-12-07 1967-02-03 Electrochimie Soc Perfectionnements aux fils et tôles en aciers inoxydables
FR2227332A1 (enrdf_load_stackoverflow) * 1973-04-25 1974-11-22 Cables De Lyon Geoffroy Delore

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983497A (en) * 1954-02-01 1961-05-09 Midland Ross Corp Cooling of moving strip
US3496033A (en) * 1967-06-05 1970-02-17 United States Steel Corp Method and apparatus for controlling annealing furnaces
US3593972A (en) * 1969-02-25 1971-07-20 Crucible Steel Corp Annealing apparatus
SU487143A1 (ru) * 1973-03-19 1975-10-05 Предприятие П/Я М-5613 Способ термической обработки аустенитных сплавов
FR2271296A1 (en) * 1974-05-14 1975-12-12 Siderurgie Fse Inst Rech Austenitic steels mfr. with improved elasticity - by grain refinement hot working treatments followed by controlled cooling
US3950192A (en) * 1974-10-30 1976-04-13 Monsanto Company Continuous carburizing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR814809A (fr) * 1936-12-11 1937-06-30 Birmingham Electr Furnaces Ltd Procédé et appareil pour le traitement thermique de métaux
FR1467814A (fr) * 1965-12-07 1967-02-03 Electrochimie Soc Perfectionnements aux fils et tôles en aciers inoxydables
FR2227332A1 (enrdf_load_stackoverflow) * 1973-04-25 1974-11-22 Cables De Lyon Geoffroy Delore

Also Published As

Publication number Publication date
US4497474A (en) 1985-02-05
FR2503187B1 (enrdf_load_stackoverflow) 1983-05-13
AU8218682A (en) 1982-10-07
CA1184029A (fr) 1985-03-19
US4461658A (en) 1984-07-24
FR2503187A1 (fr) 1982-10-08

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860128

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Inventor name: BOURGET, JEAN-CLAUDE