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US3837790A - Method and apparatus for heating metallic strip - Google Patents

Method and apparatus for heating metallic strip Download PDF

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Publication number
US3837790A
US3837790A US00319281A US31928172A US3837790A US 3837790 A US3837790 A US 3837790A US 00319281 A US00319281 A US 00319281A US 31928172 A US31928172 A US 31928172A US 3837790 A US3837790 A US 3837790A
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US
United States
Prior art keywords
strip
rolls
heating
temperature
section
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
US00319281A
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English (en)
Inventor
M Pierson
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.)
Armco Steel Co LP
Original Assignee
Armco Inc
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 Armco Inc filed Critical Armco Inc
Priority to US00319281A priority Critical patent/US3837790A/en
Priority to CA187,378A priority patent/CA990070A/en
Priority to ZA739281A priority patent/ZA739281B/xx
Priority to IT54286/73A priority patent/IT1008081B/it
Priority to GB5828373A priority patent/GB1396086A/en
Priority to DE2363223A priority patent/DE2363223C3/de
Priority to SE7317395A priority patent/SE409214B/xx
Priority to FR7346655A priority patent/FR2212916A5/fr
Priority to JP485474A priority patent/JPS5441009B2/ja
Application granted granted Critical
Publication of US3837790A publication Critical patent/US3837790A/en
Priority to BE153750A priority patent/BE825993Q/fr
Assigned to ARMCO STEEL COMPANY, L.P., A DE LIMITED PARTNERSHIP reassignment ARMCO STEEL COMPANY, L.P., A DE LIMITED PARTNERSHIP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ARMCO INC., A CORP. OF OHIO
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
    • 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
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments

Definitions

  • This invention relates to a method and apparatus for continuously heating a ferrous strip in a furnace having rolls about which the strip passes under tension.
  • the invention has great and particular utility in connection with a furnace having one or more sections through which the strip passes vertically, and having turnaround rolls and roll chambers between adjacent sections which are baffied from the furnace atmosphere.
  • Furnaces of the type under consideration are commonly used in connection with a metallic coating operation, wherein the cold reduced strip to be coated is heated continuously in the furnace for annealing while simultaneously preparing the surface to receive a molten metallic coating.
  • Continuous strip heating furnaces per se, are very old in the art.
  • the most common continuous strip heating furnace is of a horizontal configuration. That is, the furnace is elongate in the horizontal direction, and the strip to be heated passes through the furnace in a substantially straight, horizontal path of travel.
  • the strip is normally maintained under tension primarily applied by roll mechanisms of known configuration outside of the furnace.
  • Various driven supporting rolls will of course be provided within the furnace atmosphere itself.
  • continuous strip heating furnaces for metallic coating have been designed which utilize what might be called a vertical configuration. That is, the furnace includes one or more sections through which the strip to be heated passes in a substantially vertical path of travel.
  • Turn-around rolls and perhaps roll chambers are provided at the entrance and exit ends of such a vertical furnace, and between adjacent vertical sections. These rolls normally have water cooled shafts for structural purposes, and are not heated except by the strip.
  • One of the major advantages of such an arrangement is that no rolls are necessary within the hot or cold sections of the furnace. In other words, the turn-around rolls and roll chambers are often baffled from the regular furnace atmosphere.
  • Tension buckles are intermittent or continuous longitudinal corrugations in the strip usually occurring in the center area.
  • tension buckles have usually been found associated with the passage of a heated strip over a relatively cold roll surface.
  • the formation of tension buckles during cooling and/or heating clearly results in an unacceptable finished product coated strip which must be scrapped.
  • the formation of tension buckles makes it more difficult to move the strip through the coating line and often results in strip breakage and consequent shut-down of the coating line.
  • this invention is directed to a method and apparatus which has been found empirically to virtually eliminate the formation of tension buckles in a continuous strip heating furnace of the vertical configuration.
  • this invention relates to a method of continuously heating a metallic strip in a furnace having one or more sections through which the strip passes in a substantially straight, vertical path of travel, and having turn-around rolls about which the strip passes under tension located without the primary heating and cooling sections.
  • the invention contemplates the provision of heating elements adjacent each of the rolls, along with means for controlling these heating elements so that the temperature of the roll chambers are independently controlled and the surface of the roll at least will be maintained approximately at the temperature of the strip passing thereabout, and not be unduly influenced by the cooling effect of the water cooled shaft or the adjacent cooling furnace section.
  • FIGURE illustrates schematically a continuous strip heating furnace embodying the apparatus of this invention and which may advantageously be used for the practice of the method of this invention.
  • the strip to be heated is indicated at 10. It enters the first section 12 of the furnace over the rolls 14 and 16.
  • the first section of the furnace in the process under consideration may be a direct fired non-oxidizing heating section. By non-oxidizing it is contemplated that the furnace be supplied with approximately a 5 percent excess of combustibles.
  • the temperature of the furnace in this section may be on the order of 2,300 F.
  • the function of this direct fired section of the furnace 12 is to quickly burn oil and the like from the surface of the strip.
  • This section of the furnace, at the temperature indicated, will be sufficient to heat the entering strip to a temperature of 1,000 F. to l,400 F. by the time it passes through the baffle plates 18 at the bottom of the furnace section 12.
  • this section of the furnace can be of the radiant tube type heating
  • maximum strip temperature will be reached at the point the strip passes through the opening 34. This temperature may be on the order of l,200 to l,700 F.
  • This section of the furnace, in a metallic coating operation may be a tube cooling section of the furnace.
  • the strip then passes around the turn-around rolls 52 and 54, and upwardly through the opening 56 in the lower baffle plates into the furnace section 58.
  • the strip passes upwardly in this section of the furnace, through the opening 60 in the upper baffle plates, around the turn-around roll 62, downwardly through the opening 64 and through the furnace section 58, and finally out through the opening 66.
  • This section of the furnace may be of the jet cooling type and will serve to bring the strip down to a temperature of approximately 850 in the case of a metallic coating operation contemplating molten zinc.
  • the strip passes about the turn-around rolls 68 and 70, downwardly through the snout 72 and into the bath of molten coating metal, not shown.
  • tension buckles are non-uniform longitudinal corrugations. Generally, they form in the center portion of the strip and may form intermittently or continuously. Tension buckled strip must be scrapped, with the resulting loss of productive time. Equally importantly, it is extremely difficult to convey buckled strip through the coating line and a serious strip breakage hazard is present.
  • a suitable control structure will be pro vided so as to maintain the surface of the turn-around roll approximately at the temperature of the strip passing thereabout.
  • Such a control system is largely conventional per se, it would include means for sensing the temperature of the strip as it approaches the roll (indicated schematically at 76).
  • means for sensing the temperature of the roll chamber such as the zone thermo couples indicated schematically at 78), and means for actuating the radiant tubes so as to control roll cham ber temperature thereby controlling roll surface temperature to approximately the temperature of the strip passing thereabout.
  • a method of preventing tension buckles during the continuous processing of ferrous strip by passing said strip through an annealing furnace of the type having at least one primary means for producing a desired temperature of said strip located in at least one vertically oriented section through which said strip passes in vertically oriented flights and conveyor rolls at the entrance and exit ends of said section and at the top thereof about which the strip passes under longitudinal tension, said method comprising the steps of:
  • An annealing furnace for continuously processing ferrous strip comprising:
  • At least one vertically oriented heating section through which said strip passes in vertically oriented flights and primary heating means located within said section;
  • heating means in addition to said strip independent of said primary heating and cooling means disposed adjacent the surface of each of said rolls, and
  • An annealing furnace for continuously processing ferrous strip comprising at least one vertically oriented section through which said strip passes in vertically oriented flights, at least one primary means for producing a desired temperature of said strip located within said section, conveyor rolls located at the entrance and exit ends of said section and at the top thereof about which said strip passes in longitudinal tension and means in addition to said strip and independent of said primary means to maintain the surfaces of said rolls at least approximately at the temperature of said strip passing thereabout.
  • said means to maintain said roll surface temperature comprises heating means disposed adjacent said surface of each of said rolls and control means for said heating means.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US00319281A 1972-12-29 1972-12-29 Method and apparatus for heating metallic strip Expired - Lifetime US3837790A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00319281A US3837790A (en) 1972-12-29 1972-12-29 Method and apparatus for heating metallic strip
CA187,378A CA990070A (en) 1972-12-29 1973-12-05 Method and apparatus for heating metallic strip
ZA739281A ZA739281B (en) 1972-12-29 1973-12-06 Method and apparatus for heating metallic strip
IT54286/73A IT1008081B (it) 1972-12-29 1973-12-14 Procedimento ed apparecchio per il trattamento termico di banda ferrosa
GB5828373A GB1396086A (en) 1972-12-29 1973-12-17 Method and apparatus for heating metallic strip
DE2363223A DE2363223C3 (de) 1972-12-29 1973-12-19 Vorrichtung zum kontinuierlichen Erhitzen in einem Turmofen
SE7317395A SE409214B (sv) 1972-12-29 1973-12-21 Sett och glodgningsugn for kontinuerlig vermebehandling av jernhaltigt band
FR7346655A FR2212916A5 (fr) 1972-12-29 1973-12-27
JP485474A JPS5441009B2 (fr) 1972-12-29 1973-12-28
BE153750A BE825993Q (fr) 1972-12-29 1975-02-26 Procede et appareil pour le chauffage d'un feuillard metallique.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00319281A US3837790A (en) 1972-12-29 1972-12-29 Method and apparatus for heating metallic strip

Publications (1)

Publication Number Publication Date
US3837790A true US3837790A (en) 1974-09-24

Family

ID=23241597

Family Applications (1)

Application Number Title Priority Date Filing Date
US00319281A Expired - Lifetime US3837790A (en) 1972-12-29 1972-12-29 Method and apparatus for heating metallic strip

Country Status (10)

Country Link
US (1) US3837790A (fr)
JP (1) JPS5441009B2 (fr)
BE (1) BE825993Q (fr)
CA (1) CA990070A (fr)
DE (1) DE2363223C3 (fr)
FR (1) FR2212916A5 (fr)
GB (1) GB1396086A (fr)
IT (1) IT1008081B (fr)
SE (1) SE409214B (fr)
ZA (1) ZA739281B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4165964A (en) * 1976-10-27 1979-08-28 Nippon Steel Corporation Vertical direct fired strip heating furnaces
US4231167A (en) * 1978-04-07 1980-11-04 Societe Alsacienne De Constructions Mecaniques De Mulhouse Apparatus for heat treatment of continuous textile products
US4364728A (en) * 1981-05-19 1982-12-21 The Electric Furnace Company Continuous strip preheat furnace and method of operation
US4545762A (en) * 1982-10-28 1985-10-08 Toray Industries, Inc. Apparatus for producing oxidized filaments
US4559010A (en) * 1984-05-01 1985-12-17 Toray Industries, Inc. Apparatus for producing oxidized filaments
US4743196A (en) * 1985-06-10 1988-05-10 Chugai Ro Co., Ltd. Continuous annealing furnace for a strip
US4759807A (en) * 1986-12-29 1988-07-26 Rasmet Ky Method for producing non-aging hot-dip galvanized steel strip
AT500686B1 (de) * 2004-06-28 2007-03-15 Ebner Ind Ofenbau Verfahren zur wärmebehandlung eines metallbandes vor einer metallischen beschichtung

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53119208A (en) * 1977-03-28 1978-10-18 Nippon Kokan Kk <Nkk> Preventing method for meandering of strip in continuous annealing furnace
JPS53130211A (en) * 1977-04-20 1978-11-14 Chugai Ro Kogyo Kaisha Ltd Vertical type continuous heat treatment furnace with separate roll chamber
US4183983A (en) * 1978-08-17 1980-01-15 Selas Corporation Of America Method for reducing metal oxide formation on a continuous metal sheet in the hot dip coating thereof
JPS5942733B2 (ja) * 1979-10-31 1984-10-17 川崎製鉄株式会社 鋼帯連続焼鈍設備
US4494929A (en) * 1982-03-19 1985-01-22 Nippon Steel Corporation Continuous heat treatment furnace
JP2634881B2 (ja) * 1988-10-31 1997-07-30 日本鋼管株式会社 直火式ストリップ加熱炉の竪型予熱炉
JPH0726356Y2 (ja) * 1990-01-10 1995-06-14 日本鋼管株式会社 金属板の竪形連続熱処理炉
FR2820148B1 (fr) * 2001-01-31 2003-10-31 Stein Heurtey Perfectionnements apportes aux procedes de chauffage de bandes d'acier dans des fours verticaux
JP5119787B2 (ja) * 2007-07-30 2013-01-16 Ｊｆｅスチール株式会社 連続焼鈍ラインの運転方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199472A (en) * 1939-02-09 1940-05-07 Wean Engineering Co Inc Method and apparatus for annealing strip
US3070362A (en) * 1961-03-02 1962-12-25 Midland Ross Corp Furnace roller
US3191918A (en) * 1961-06-15 1965-06-29 American Can Co Apparatus for flow brightening electrolytic tinplate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2585277A (en) * 1946-06-27 1952-02-12 Drever Co Apparatus for annealing strip
JPS3810009Y1 (fr) * 1961-03-13 1962-05-25
US3622140A (en) * 1970-01-30 1971-11-23 Nat Steel Corp Continuous heat treating line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199472A (en) * 1939-02-09 1940-05-07 Wean Engineering Co Inc Method and apparatus for annealing strip
US3070362A (en) * 1961-03-02 1962-12-25 Midland Ross Corp Furnace roller
US3191918A (en) * 1961-06-15 1965-06-29 American Can Co Apparatus for flow brightening electrolytic tinplate

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4165964A (en) * 1976-10-27 1979-08-28 Nippon Steel Corporation Vertical direct fired strip heating furnaces
US4231167A (en) * 1978-04-07 1980-11-04 Societe Alsacienne De Constructions Mecaniques De Mulhouse Apparatus for heat treatment of continuous textile products
US4364728A (en) * 1981-05-19 1982-12-21 The Electric Furnace Company Continuous strip preheat furnace and method of operation
US4545762A (en) * 1982-10-28 1985-10-08 Toray Industries, Inc. Apparatus for producing oxidized filaments
US4559010A (en) * 1984-05-01 1985-12-17 Toray Industries, Inc. Apparatus for producing oxidized filaments
US4743196A (en) * 1985-06-10 1988-05-10 Chugai Ro Co., Ltd. Continuous annealing furnace for a strip
US4759807A (en) * 1986-12-29 1988-07-26 Rasmet Ky Method for producing non-aging hot-dip galvanized steel strip
AT500686B1 (de) * 2004-06-28 2007-03-15 Ebner Ind Ofenbau Verfahren zur wärmebehandlung eines metallbandes vor einer metallischen beschichtung

Also Published As

Publication number Publication date
DE2363223C3 (de) 1981-09-03
DE2363223A1 (de) 1974-07-11
GB1396086A (en) 1975-05-29
DE2363223B2 (de) 1981-01-22
CA990070A (en) 1976-06-01
JPS5441009B2 (fr) 1979-12-06
FR2212916A5 (fr) 1974-07-26
SE409214B (sv) 1979-08-06
BE825993Q (fr) 1975-06-16
IT1008081B (it) 1976-11-10
ZA739281B (en) 1974-10-30
JPS4998308A (fr) 1974-09-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ARMCO STEEL COMPANY, L.P., 703 CURTIS STREET, MIDD

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ARMCO INC., A CORP. OF OHIO;REEL/FRAME:005110/0744

Effective date: 19890511