EP0126696B2 - Verfahren zur kontinuierlichen Herstellung von überaltertem Stahlband, beschichtet mit Zink oder mit einer Aluminium-Zink-Legierung - Google Patents

Verfahren zur kontinuierlichen Herstellung von überaltertem Stahlband, beschichtet mit Zink oder mit einer Aluminium-Zink-Legierung Download PDF

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Publication number
EP0126696B2
EP0126696B2 EP84401067A EP84401067A EP0126696B2 EP 0126696 B2 EP0126696 B2 EP 0126696B2 EP 84401067 A EP84401067 A EP 84401067A EP 84401067 A EP84401067 A EP 84401067A EP 0126696 B2 EP0126696 B2 EP 0126696B2
Authority
EP
European Patent Office
Prior art keywords
zinc
coating
temperature
strip
guide rollers
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
EP84401067A
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English (en)
French (fr)
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EP0126696A1 (de
EP0126696B1 (de
Inventor
Charles Brun
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.)
USINOR SA
Original Assignee
Union Siderurgique du Nord et de lEst de France SA USINOR
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Publication date
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Application filed by Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical Union Siderurgique du Nord et de lEst de France SA USINOR
Priority to AT84401067T priority Critical patent/ATE30744T1/de
Publication of EP0126696A1 publication Critical patent/EP0126696A1/de
Application granted granted Critical
Publication of EP0126696B1 publication Critical patent/EP0126696B1/de
Publication of EP0126696B2 publication Critical patent/EP0126696B2/de
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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
    • 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
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching

Definitions

  • the present invention relates to a process for the continuous production of a zinc coating or a zinc-aluminum alloy on a steel strip obtained by cold rolling.
  • the invention relates in particular, but not exclusively, to a process for galvanizing a cold-rolled steel strip.
  • the metal cold worked by cold rolling in the form of a strip is first of all subjected to a continuous annealing treatment.
  • This treatment includes a thermal cycle of heating and maintaining temperature, followed by more or less rapid cooling stopped at the melting temperature of the zinc bath.
  • the steel strip is galvanized by dipping in a zinc bath at a temperature between about 460 and 500 ° C., then the strip is continuously extracted from the zinc and cooled before being stored in coils.
  • the metal is completely recrystallized, but the carbon dissolved during the heating and maintenance period of the annealing treatment remains in the state of supersaturated solution in the ferrite. If, at this stage, the cooling of the coated steel strip is continued to a temperature below 270 ° C, at a speed greater than 5 ° C per second, part of the carbon remains in solution. Carbon in supersaturated solution in ferrite makes the metal sensitive to aging by precipitation of the supersaturated carbon on the dislocations due to the cold deformation that the sheet will later undergo.
  • the supersaturation carbon is precipitated by prolonged annealing in coils.
  • the annealing must be carried out at a temperature below 300 ° C. and must be long, both to obtain sufficient homogeneity of the temperature and complete precipitation of carbon.
  • this result is achieved after maintaining for 6 hours at a temperature above 250 ° C.
  • the surface hardening operation which eliminates the elastic bearing and imprints a roughness set on the surface of the sheet can then be carried out on the metal having undergone such over-aging, without risk of subsequent aging.
  • an overaging cycle which can be carried out continuously, is expensive and lengthens the production cycle.
  • FR-A-2 450 285 there is known a method of manufacturing a steel strip coated by immersion in a metal bath, comprising a brutal cooling step downstream of the coating by dipping in the bath, before the overaging treatment .
  • US-A-2,570,906 describes a method and a device for coating a metal strip, in which the coated strip passes through a heat treatment enclosure containing alternating guide rollers.
  • GB-A-1 565 874 describes the manufacture of a galvanized steel sheet by heating the sheet to 650-950 ° C, cooling in a molten salt bath to 420-500 ° C then, after coating, overaging at 300-420 ° C for 30 to 120 s.
  • Patents Abstracts of Japan Vol. 2, No 52, April 14, 1978, page 249C78 shows an annealing chamber of a strip of galvanized steel on a set of rollers preventing the metal from sticking.
  • the present invention aims to remedy the aforementioned drawbacks in order to provide a coated sheet which can be continuously processed and have the required technical qualities.
  • the rapid cooling following the heating thermal cycle must be carried out at a speed of 10 to 25 ° C / s.
  • the steel strip subjected to the overaging treatment is coated on one or both sides with a layer of zinc, or a zinc-aluminum alloy.
  • the guide rollers are arranged so that they are in contact with the face free of the coating layer.
  • a steel strip cold worked by cold rolling is first subjected to a continuous annealing treatment in the galvanizing line following a cycle which is illustrated in Figure 1.
  • the overaging treatment can be considerably shortened if it is carried out after rapid cooling of the metal before entering the zinc bath.
  • Complete overaging can be achieved by holding for at least 2 minutes at about 430-270 ° C, provided that the rapid cooling rate from about 800 ° C to about 470 ° C is preferably greater than 10 ° C / s.
  • One of the original characteristics of the process of the present invention consists in minimizing this risk by an arrangement of the guide rollers with respect to the strip, so that only one face of the strip, in the portion where the strip is at higher temperature. at 330 ° C or in contact with the guide rollers. This completely avoids the risk of scratches for the side not in contact with the guide rollers in the part where the strip is at a temperature above 330 ° C.
  • the face thus preserved from contact with the guide rollers will be reserved as a visible face, in particular in body sheets which must have a perfect surface condition.
  • the thermal cycle undergone by the steel strip has been represented, representing, on the one hand, the aging according to the present invention and, on the other hand, normal cooling of the strip without aging .
  • the method of the present invention is implemented in an installation partially shown in FIG. 1.
  • the strip 1 of cold rolled steel is supplied from supply means not shown in an oven 2, where it undergoes an annealing treatment with a heating phase in zone 3 and cooling in zone 4.
  • the strip 1 is then continuously galvanized by dipping in a bath of molten zinc 5 contained in a crucible 6.
  • This crucible is provided with means for returning the strip in the form of a roller 7 immersed in the bath zinc.
  • Tape 1 is then extracted vertically from the zinc bath 5 and undergoes conventional treatment operations for the layer of zinc deposited in zones 8 and is guided by a roller 9 in the direction of the overaging enclosure 10.
  • the steel strip carrying its zinc coating is introduced into the overaging enclosure 10 through an orifice 11 at a temperature close to this location of 370 ° C.
  • the overaging enclosure 10 includes a set of guide rollers arranged horizontally and parallel to each other.
  • the strip 1 travels in this enclosure a first path from its entry 11 passing over the guide rollers 12, 13, 14, 15 and 16 following a spiral winding, so that the same face of this strip from its exit from the bath zinc is in contact with the guide rollers.
  • the temperature of the strip is approximately 330 ° C., so that it is then possible to put the face which has not undergone any contact with the guide rollers with these.
  • the strip follows an accordion path on the rollers 17 and 18a to 18d, as well as 19a to 19c, the rollers 18a to 18d being arranged respectively at the upper part of the enclosure, while the rollers 19a to 19c are arranged at the lower part of the latter.
  • the strip is extracted from the enclosure 10 through an orifice 20 at a temperature of 270 ° C. and sent using suitable rollers to a work hardening station, not shown, after cooling to a temperature ⁇ at 50 ° C. .
  • the temperature of the enclosure is regulated so as to ensure a strip temperature of at least 370 ° C. at the inlet of the enclosure and at least 270 ° C. at the outlet of the enclosure.
  • the length of the aging zone is provided in such a way that the effective time between leaving the zinc bath and leaving the aging zone at a temperature greater than or equal to 270 ° C. is at least 2 minutes and, from preferably between 2 and 5 minutes approximately for the galvanization of steel intended to be stamped.
  • the strip of galvanized steel ends up at the end of a hardening rolling mill, not shown, so as to erase the elastic flow bearing and to impart a surface roughness adjusted to the sheet, then the strip is wound up and stored.
  • guide rollers of the overaging enclosure must have a diameter such that the diameter to thickness ratio of the strip is greater than 800, so as to avoid hardening the metal by work hardening.
  • the guide rollers are in particular hollow rolls of steel with rectified surface, having a fine roughness (0.5 ⁇ m), burnished by oxidation between 300 and 500 ° C.
  • the face comprising the thin coating of iron-zinc alloy is presented in contact with the guide rollers 9 and 12 to 15 of the overaging treatment zone. This keeps the conventional zinc coating out of contact with the guide rollers during the first spiral wound path. As the face comprising the thin coating of iron-zinc alloy is not subject to deterioration in contact with the guide rollers, there is no deterioration in its qualities.
  • Cycle 1 corresponds to the prior art without overaging treatment with continuous hardening at the end of the line of 1%.
  • Cycle 2 corresponds to galvanizing according to the prior art with over-aging in a coil not allowing continuous treatment.
  • Cycle 3 corresponds to the process of the present invention.
  • the reappearance of the elastic bearing is, moreover, relatively low compared to cycle 1 not comprising an overaging step.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Belt Conveyors (AREA)

Claims (3)

1. Kontinuierliches Verfahren zur Beschichtung eines kaltgewalzten Stahlbandes mit einer Schicht aus Zn oder einer Zn-Al-Legierung, welches eine Temperatur-Zeit-Folge der Erwärmung, gefolgt von einem raschen Abkühlen, ein Tauchbeschichten in dem Bad aus schmelzflüssigem Beschichtungsmetall bei einer Temperatur von 460° bis 500° C, eine Überalterungsbehandlung und ein Nachabkühlen umfaßt, dadurch gekennzeichnet, daß
- das rasche Abkühlen am Ende der Temperatur-Zeit-Folge der Erwärmung mit einer Geschwindigkeit von 10 bis 50 °C/s durchgeführt wird,
- und die Überalterungsbehandlung bei einer Temperatur zwischen 430 und 270 °C für wenigstens zwei Minuten durchgeführt wird, wobei das Band einer ersten Bewegungsbahn in schneckenförmiger Wicklung, in welcher es die gleiche Seite in Berührung mit den Führungsrollen aufweist, während seine Temperatur von 430 auf 330 °C sinkt, und einer zweiten, mehrfach gewendeten Bewegungsbahn bis zum Ausgang der Zone der Überalterungsbehandlung folgt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Geschwindigkeit des raschen Abkühlens zwischen 10 und 25 °C/s beträgt.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das die Überalterungsbehandlung durchmachende beschichtete Band in dieser Überalterungszone eine mit einer herkömmlichen Zinkbeschichtung beschichtete Seite und eine mit einer dünnen Schicht aus Eisen-Zinklegierung beschichtete Seite, welche mit den Führungsrollen in Berührung gebracht wird, aufweist.
EP84401067A 1983-05-24 1984-05-23 Verfahren zur kontinuierlichen Herstellung von überaltertem Stahlband, beschichtet mit Zink oder mit einer Aluminium-Zink-Legierung Expired - Lifetime EP0126696B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84401067T ATE30744T1 (de) 1983-05-24 1984-05-23 Verfahren und vorrichtung zur kontinuierlichen herstellung von ueberaltertem stahlband, beschichtet mit aluminium, zink oder mit einer aluminium-zink-legierung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8308508A FR2546534B1 (fr) 1983-05-24 1983-05-24 Procede et installation de fabrication en continu d'une bande d'acier survieillie portant un revetement de zn, al ou d'alliage zn-al
FR8308508 1983-05-24

Publications (3)

Publication Number Publication Date
EP0126696A1 EP0126696A1 (de) 1984-11-28
EP0126696B1 EP0126696B1 (de) 1987-11-11
EP0126696B2 true EP0126696B2 (de) 1992-02-19

Family

ID=9289101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84401067A Expired - Lifetime EP0126696B2 (de) 1983-05-24 1984-05-23 Verfahren zur kontinuierlichen Herstellung von überaltertem Stahlband, beschichtet mit Zink oder mit einer Aluminium-Zink-Legierung

Country Status (9)

Country Link
US (2) US4530858A (de)
EP (1) EP0126696B2 (de)
JP (1) JPS6052529A (de)
AT (1) ATE30744T1 (de)
AU (1) AU569094B2 (de)
CA (1) CA1215889A (de)
DE (1) DE3467376D1 (de)
ES (2) ES533091A0 (de)
FR (1) FR2546534B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759807A (en) * 1986-12-29 1988-07-26 Rasmet Ky Method for producing non-aging hot-dip galvanized steel strip
SE8701837D0 (sv) * 1987-05-05 1987-05-05 Ssab Svenskt Stal Ab Ytbehandlingsanleggning och sett att belegga en stalprodukt
EP0406619A1 (de) * 1989-06-21 1991-01-09 Nippon Steel Corporation Verfahren zur Herstellung von kaltgewalzten verzinkten nichtalternden Stahlblechen mit guter Formbarkeit in einer Durchlaufverzinkungslinie
DE19822156A1 (de) * 1998-05-16 1999-11-18 Schloemann Siemag Ag Verfahren und Vorrichtung zur Durchführung der Glühung eines Galvannealing-Prozesses
US6274200B1 (en) 1998-09-11 2001-08-14 Boeing North American, Inc. Method for preparing pre-coated ferrous-alloy components and components prepared thereby
JP4981374B2 (ja) 2006-07-10 2012-07-18 パーパス株式会社 細胞又は組織の培養装置及び培養方法
JP5433129B2 (ja) 2006-07-10 2014-03-05 パーパス株式会社 細胞又は組織の培養方法
CN109280861A (zh) 2017-07-21 2019-01-29 蒂森克虏伯钢铁欧洲股份公司 具有良好耐老化性的扁钢产品及其生产方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570906A (en) * 1946-07-31 1951-10-09 Alferieff Michel Process for coating metallic objects with other metals
US3971862A (en) * 1972-08-10 1976-07-27 Nippon Kokan Kabushiki Kaisha Continuous hot-dip galvanizing process for steel strip
US4216250A (en) * 1976-05-19 1980-08-05 Nippon Steel Corporation Method for producing a steel sheet having a zinc coating on one side
US4104088A (en) * 1977-05-23 1978-08-01 Jones & Laughlin Steel Corporation Method of making differentially coated one side alloyed galvanized steel strip
JPS5446139A (en) * 1977-09-21 1979-04-11 Kawasaki Steel Co Method of making galvanized steel plate for drawing use
JPS608289B2 (ja) * 1978-10-16 1985-03-01 日新製鋼株式会社 加工性のすぐれた溶融めつき鋼板の製造方法
BE874599A (fr) * 1979-03-02 1979-09-03 Centre Rech Metallurgique Procede de fabrication d'une bande d'acier revetue
JPS55122820A (en) * 1979-03-13 1980-09-20 Kawasaki Steel Corp Manufacture of alloyed zinc-plated high tensile steel sheet with superior workability
JPS55122821A (en) * 1979-03-15 1980-09-20 Kawasaki Steel Corp Manufacture of alloyed zinc-plated high tensile steel sheet with high workability
US4294632A (en) * 1979-09-24 1981-10-13 Nisshin Steel Co., Ltd. Method for overaging of hot dip metal coated steel material
US4287009A (en) * 1979-11-08 1981-09-01 Bethlehem Steel Corporation Method of producing an aluminum-zinc alloy coated ferrous product to improve corrosion resistance
US4287008A (en) * 1979-11-08 1981-09-01 Bethlehem Steel Corporation Method of improving the ductility of the coating of an aluminum-zinc alloy coated ferrous product
JPS5779161A (en) * 1980-11-04 1982-05-18 Sumitomo Metal Ind Ltd Production of zinc hot dipped steel plate
LU83353A1 (fr) * 1981-05-11 1983-03-24 Centre Rech Metallurgique Procede de fabrication de toles galvanisees de qualite amelioree
US4408561A (en) * 1981-08-24 1983-10-11 Nippon Steel Corporation Dual-purpose plant for producing cold rolled steel sheet and hot-dip galvanized steel sheet
JPS5867855A (ja) * 1981-10-16 1983-04-22 Kawasaki Steel Corp 片面溶融亜鉛めつき鋼板の製造装置

Also Published As

Publication number Publication date
ES8600788A1 (es) 1985-10-16
CA1215889A (fr) 1986-12-30
FR2546534A1 (fr) 1984-11-30
JPS6052529A (ja) 1985-03-25
ATE30744T1 (de) 1987-11-15
ES533091A0 (es) 1985-10-16
DE3467376D1 (en) 1987-12-17
AU569094B2 (en) 1988-01-21
AU3057884A (en) 1986-01-16
FR2546534B1 (fr) 1989-04-21
EP0126696A1 (de) 1984-11-28
EP0126696B1 (de) 1987-11-11
ES8801711A1 (es) 1988-02-16
US4620501A (en) 1986-11-04
ES541797A0 (es) 1988-02-16
US4530858A (en) 1985-07-23

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