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EP0169827A1 - Verfahren zum Herstellen von Hartstahldraht - Google Patents

Verfahren zum Herstellen von Hartstahldraht Download PDF

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Publication number
EP0169827A1
EP0169827A1 EP85870099A EP85870099A EP0169827A1 EP 0169827 A1 EP0169827 A1 EP 0169827A1 EP 85870099 A EP85870099 A EP 85870099A EP 85870099 A EP85870099 A EP 85870099A EP 0169827 A1 EP0169827 A1 EP 0169827A1
Authority
EP
European Patent Office
Prior art keywords
cooling
phase
wire
conveyor
rod
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.)
Granted
Application number
EP85870099A
Other languages
English (en)
French (fr)
Other versions
EP0169827B1 (de
Inventor
Norbert Bach
Marios Economopoulos
Marc Gredt
Guy Lessel
Arthur Schummer
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.)
Centre de Recherches Metallurgiques CRM ASBL
Arcelor Luxembourg SA
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Arbed 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19730294&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0169827(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Centre de Recherches Metallurgiques CRM ASBL, Arbed SA filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT85870099T priority Critical patent/ATE35154T1/de
Publication of EP0169827A1 publication Critical patent/EP0169827A1/de
Application granted granted Critical
Publication of EP0169827B1 publication Critical patent/EP0169827B1/de
Expired legal-status Critical Current

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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
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
    • B21C47/262—Treatment of a wire, while in the form of overlapping non-concentric rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
    • 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
    • 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
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods

Definitions

  • the present invention relates to a method for manufacturing wire rod of hard steel, that is to say of steel having a carbon content greater than 0.4%; this process according to the invention comprises an original heat treatment phase, applied to the wire as soon as it leaves the hot rolling mill.
  • the process according to the invention has the further advantage of eliminating the drawbacks arising from central segregation resulting from the continuous casting operation of the steels; this central segregation is particularly troublesome when the wires are intended to be used after drawing in the form of active reinforcements for prestressed concrete.
  • the average carbon content can reach in this case 0, B%, the content of this element in the segregated zones can exceed 1.1%; during normal cooling on modern trains, there is a precipitation of cementite which has a detrimental effect on the wire drawing.
  • the methods proposed to achieve the aim can be classified into two categories depending on whether the controlled cooling is applied online, before the formation of turns, or on the turn conveyor spread.
  • the first consists in cooling the wire to a temperature below 600 ° C, by passing through water cooling boxes between which sections of air are inserted allowing a rise in the temperature at the surface of the wire; the entire installation is calculated so as to obtain the desired reduction in the average temperature of the wire while avoiding the formation of martensite on the surface.
  • the ramp could be constructed in such a way that the surface temperature of the wire is much higher than the point Ms and this for all the diameters and all the qualities of the range of products, but the result of this obligation would be that the length of the cooling ramp would be very much greater than its maximum practical value. This would lead to very high investment costs and difficult operation of the train.
  • the second recommended system also consists in cooling the wire before depositing, but here admitting the formation of a surface layer of martensite of very limited thickness; this way of proceeding, if it makes it possible to shorten the cooling line and eliminate the drawback of making an installation comprising different cooling boxes and separated by air cooling zones, does not bring any solution to the other disadvantages which have just been mentioned, namely the difficulty of adapting the ramp to the whole range of products to be manufactured; on the other hand, this process involves an additional disadvantage in the continuation of the heat treatment because the recalescence which it is necessary to fight when the wire is spread on the conveyor is all the more important as the temperature has been lowered more sharply from the start of transformation.
  • the cooling treatment of the wire by immersion in a bath of molten salt or in a concentrated aqueous solution also has its own drawbacks, in particular the essential subsequent washing of the wire and the need to use fairly specific installations.
  • the current technique has not made it possible to recource, this value, the problem posed, namely to obtain a good average value of the properties of a hard wire in each coil of this wire, as well as a dispersion follows the properties of the wire around the mean value.
  • the reason is - except for the supply of air - that the processes considered are often economically and / or technically unusable.
  • the subject of the present invention is precisely a process for the manufacture of hard steel wire rod, by means of which a wire is obtained whose mechanical properties are similar to those obtained when the additional lead patenting operation is carried out, and whose the dispersion of the properties around the mean value, in a coil, is so low that we can consider that these properties are homogeneous.
  • the process which is the subject of the present invention is essentially characterized in that, on leaving the hot rolling mill, the wire is subjected to cooling comprising two phases, the first being applied to the wire while the latter crosses at the speed of end of rolling a cooling line located between the finishing unit and the roller drive located at the entrance to the deposition head, said cooling line being continuous, that is to say having no air cooling intervals between successive sections of intense cooling, the length of said cooling line and its power being adjusted in such a way that the surface temperature of the wire at the end of this first phase is between the start temperature of the martensitic transformation for the steel considered and this temperature + 200 ° C, in that the second cooling phase is applied to the wire as soon as it is laid out in non-concentrated spreads ique on a conveyor, the time delay between the end of the first phase and the start of the second phase being less than that for which the percentage of transformed austenite exceeds 5%, and in that the transformation of austenite is at least 95% at the end of the second phase.
  • the first cooling is carried out by means of a fluid applied using devices allowing a cooling intensity characterized by an average density of heat flow to be achieved. between 3 and 7 MW / m 2 .
  • the intensity of the cooling during the second phase is between 0.1 MW / m 2 and 0.4 MW / m2.
  • the cooling of the wire spread on the conveyor, during the second phase of the heat treatment can be obtained either by blowing air, by immersion in boiling water or by any other known means.
  • the value targeted by the surface temperature (Ts) at the outlet of the first phase is obtained, according to the invention, by choosing an appropriate combination between the values of the length (L) of the cooling line (or the duration) and the average heat flux density ( ⁇ ).
  • the couple ( ⁇ - L) chosen, according to the process, will be such that the desired mechanical properties are obtained after the treatment of the second phase.
  • the target breaking load (TS) will be close to the value given by the formula:
  • n (a) and (a ') the amount of austenite transformed is 2% while it is 98% in (b) and (b'), that is to say at the end of the second phaae.
  • This figure also shows that the second objective, elimination of the pro-eutectoid cementite at the core of the segregated wires, is automatically achieved by applying the method.
  • the temperature at the start of transformation of the heart is lowered below 600 ° C., which prevents precipitation of the pro-eutectoid cementite.
  • the finisher comprising, following the cages (2), a cooling line (3) of length (L 1 ) located in place of unused cages, the "break out box”"(4), the continuous cooling line (5) of length (L 2 ), the head (6) for winding and depositing on the conveyor (7), which is provided with a cooling device (8 ) of length (L 3 ) to ensure the second phase of the treatment.
  • phase I cooling device is characterized by a constant value of the heat flux density ( ⁇ ). It follows that the exchange coefficient taken into account for the calculations will be of the form:
  • T s is the surface temperature and T m the temperature of the coolant.
  • FIG. 3 represents all of the couples (L 2 , ⁇ ) making it possible to produce MTT in the case of the manufacture of a wire of 7 mm in diameter, made of steel at 0.63% C and 0.65% Mn, laminated with an end-of-rolling temperature (T 0 ) of 1050 ° C and an exit speed (V) of 82.8 m / s, where the ramp length (L 1 ) installed in the block is 1 m.
  • T 0 end-of-rolling temperature
  • V exit speed
  • This figure 3 also gives, for each pair (L 2 , ⁇ ) the value of the minimum surface temperature (T) reached during the first phase. It is clear that the higher the minimum permitted surface temperature, the greater the length L 2 necessary 5.
  • water cannons are used of a conventional type and the ( ⁇ ) is adjusted by acting on the supply pressure of these cannons.
  • Water-air cannons can also be used and in this case the adjustment is made by action on the air flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
EP85870099A 1984-07-23 1985-07-18 Verfahren zum Herstellen von Hartstahldraht Expired EP0169827B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85870099T ATE35154T1 (de) 1984-07-23 1985-07-18 Verfahren zum herstellen von hartstahldraht.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85475A LU85475A1 (fr) 1984-07-23 1984-07-23 Procede pour fabriquer du fil machine en acier dur
LU85475 1984-07-23

Publications (2)

Publication Number Publication Date
EP0169827A1 true EP0169827A1 (de) 1986-01-29
EP0169827B1 EP0169827B1 (de) 1988-06-15

Family

ID=19730294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85870099A Expired EP0169827B1 (de) 1984-07-23 1985-07-18 Verfahren zum Herstellen von Hartstahldraht

Country Status (7)

Country Link
US (1) US4704166A (de)
EP (1) EP0169827B1 (de)
JP (1) JPS6184331A (de)
AT (1) ATE35154T1 (de)
BE (1) BE902931A (de)
DE (1) DE3563361D1 (de)
LU (1) LU85475A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282472A1 (de) * 1987-02-11 1988-09-14 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Verfahren zum Kühlen von Stab- oder Drahtmaterial sowie Vorrichtung zur Durchführung dieses Verfahrens
WO1991000368A1 (fr) * 1989-07-03 1991-01-10 Centre De Recherches Metallurgiques Procede et dispositif de refroidissement continu d'un fil d'acier trefile
EP0496715A1 (de) * 1991-01-21 1992-07-29 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren und Vorrichtung zur Erzeugung von hochfestem Walzdraht aus höhergekohlten Stählen
EP1956292A1 (de) * 2005-11-08 2008-08-13 Kobelco Eco-Solutions Co., Ltd. Sekundärverbrennungsverfahren und -einheit in einer verbrennungsanlage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2098160A1 (en) * 1993-04-12 1994-10-13 Charles N.A. Tonteling Process for producing patented steel wire
US7093526B2 (en) * 1999-05-20 2006-08-22 Honda Giken Kogyo Kabushiki Kaisha Forming die apparatus
US20080011394A1 (en) * 2006-07-14 2008-01-17 Tyl Thomas W Thermodynamic metal treating apparatus and method
US8372766B2 (en) * 2007-07-31 2013-02-12 Kimberly-Clark Worldwide, Inc. Conductive webs
US8058194B2 (en) * 2007-07-31 2011-11-15 Kimberly-Clark Worldwide, Inc. Conductive webs

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU57682A1 (de) * 1968-02-15 1969-04-15
BE737682A (en) * 1969-08-19 1970-02-19 Wire rod manufacturing process
FR2023878A1 (de) * 1968-11-22 1970-08-21 Centre Nat Rech Metall
US3547421A (en) * 1966-05-07 1970-12-15 Schloemann Ag Adjustable length for production of patented steel wire
FR2066203A5 (de) * 1969-10-17 1971-08-06 Centre Nat Rech Metall
DE2529272A1 (de) * 1974-07-05 1976-01-22 Centre Rech Metallurgique Verfahren und vorrichtung fuer die behandlung von walzdraht
DE2612918A1 (de) * 1975-04-02 1976-10-21 Florin Stahl Walzwerk Verfahren zur herstellung von walzstahlerzeugnissen mit entfestigter randzone und hochfestem kern
US4123296A (en) * 1973-12-17 1978-10-31 Kobe Steel, Ltd. High strength steel rod of large gauge
FR2445858A1 (fr) * 1979-01-05 1980-08-01 Salzgitter Peine Stahlwerke Acier a beton soudable et procede d'obtention de cet acier
GB1595281A (en) * 1978-02-27 1981-08-12 Hamburger Stahlwerke Gmbh Method of continuously cooling rolled wire
EP0058324A2 (de) * 1981-02-14 1982-08-25 Sms Schloemann-Siemag Aktiengesellschaft Vorrichtung zum geregelten Kühlen von Walzdraht aus der Walzhitze

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173037A (en) * 1967-07-21 1969-12-03 Templeborough Rollis Mills Ltd Process and apparatus for Cooling Hot-Rolled Steel Rod
JPS498611B1 (de) * 1968-01-24 1974-02-27
US3645805A (en) * 1969-11-10 1972-02-29 Schloemann Ag Production of patented steel wire
DD127063A1 (de) * 1976-06-09 1977-09-07
CA1097197A (en) * 1977-02-08 1981-03-10 Philippe A. Paulus Method of and apparatus for controlled cooling of metallurgical products
JPS55161031A (en) * 1979-06-04 1980-12-15 Nippon Steel Corp Direct heat treating apparatus of hot rolled steel wire rod
JPS5845328A (ja) * 1981-09-11 1983-03-16 Nippon Steel Corp 圧延線材直接熱処理ライン

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3547421A (en) * 1966-05-07 1970-12-15 Schloemann Ag Adjustable length for production of patented steel wire
LU57682A1 (de) * 1968-02-15 1969-04-15
FR2023878A1 (de) * 1968-11-22 1970-08-21 Centre Nat Rech Metall
BE737682A (en) * 1969-08-19 1970-02-19 Wire rod manufacturing process
FR2066203A5 (de) * 1969-10-17 1971-08-06 Centre Nat Rech Metall
US4123296A (en) * 1973-12-17 1978-10-31 Kobe Steel, Ltd. High strength steel rod of large gauge
DE2529272A1 (de) * 1974-07-05 1976-01-22 Centre Rech Metallurgique Verfahren und vorrichtung fuer die behandlung von walzdraht
DE2612918A1 (de) * 1975-04-02 1976-10-21 Florin Stahl Walzwerk Verfahren zur herstellung von walzstahlerzeugnissen mit entfestigter randzone und hochfestem kern
GB1595281A (en) * 1978-02-27 1981-08-12 Hamburger Stahlwerke Gmbh Method of continuously cooling rolled wire
FR2445858A1 (fr) * 1979-01-05 1980-08-01 Salzgitter Peine Stahlwerke Acier a beton soudable et procede d'obtention de cet acier
EP0058324A2 (de) * 1981-02-14 1982-08-25 Sms Schloemann-Siemag Aktiengesellschaft Vorrichtung zum geregelten Kühlen von Walzdraht aus der Walzhitze

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282472A1 (de) * 1987-02-11 1988-09-14 VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H. Verfahren zum Kühlen von Stab- oder Drahtmaterial sowie Vorrichtung zur Durchführung dieses Verfahrens
AT396074B (de) * 1987-02-11 1993-05-25 Voest Alpine Ind Anlagen Verfahren zum kuehlen von stab- oder drahtmaterial sowie vorrichtung zur durchfuehrung dieses verfahrens
WO1991000368A1 (fr) * 1989-07-03 1991-01-10 Centre De Recherches Metallurgiques Procede et dispositif de refroidissement continu d'un fil d'acier trefile
EP0496715A1 (de) * 1991-01-21 1992-07-29 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren und Vorrichtung zur Erzeugung von hochfestem Walzdraht aus höhergekohlten Stählen
EP1956292A1 (de) * 2005-11-08 2008-08-13 Kobelco Eco-Solutions Co., Ltd. Sekundärverbrennungsverfahren und -einheit in einer verbrennungsanlage
EP1956292A4 (de) * 2005-11-08 2010-12-15 Kobelco Eco Solutions Co Ltd Sekundärverbrennungsverfahren und -einheit in einer verbrennungsanlage

Also Published As

Publication number Publication date
DE3563361D1 (en) 1988-07-21
EP0169827B1 (de) 1988-06-15
ATE35154T1 (de) 1988-07-15
US4704166A (en) 1987-11-03
JPS6184331A (ja) 1986-04-28
LU85475A1 (fr) 1986-02-12
BE902931A (fr) 1986-01-20

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