US2984473A - Furnace conveyor rolls and the like - Google Patents

Furnace conveyor rolls and the like Download PDF

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Publication number
US2984473A
US2984473A US748320A US74832058A US2984473A US 2984473 A US2984473 A US 2984473A US 748320 A US748320 A US 748320A US 74832058 A US74832058 A US 74832058A US 2984473 A US2984473 A US 2984473A
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US
United States
Prior art keywords
roll
furnace
coating
stabilized zirconia
zirconia
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
US748320A
Other languages
English (en)
Inventor
Martin N Ornitz
Ray H English
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.)
Blaw Knox Co
Original Assignee
Blaw Knox Co
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 Blaw Knox Co filed Critical Blaw Knox Co
Priority to US748320A priority Critical patent/US2984473A/en
Priority to BE591436A priority patent/BE591436A/fr
Application granted granted Critical
Publication of US2984473A publication Critical patent/US2984473A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/937—Sprayed metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12611—Oxide-containing component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12611—Oxide-containing component
    • Y10T428/12618—Plural oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12778—Alternative base metals from diverse categories

Definitions

  • This invention relates to furnace conveyor rolls and the like and particularly to furnace conveyor rolls over which metallic strip is passed and advanced through a heating furnace.
  • the invention will be particularly illustrated and described as embodied in a furnace conveyor roll for passing steel strip through an annealing furnace. It is well known in the metal treating arts that difficulties are encountered by reasons of the collection of accretions of material from metal strip on the metallic conveyor in the heating furnace, e.g., metallic conveyor elements used in annealing strip with the strip passing over or around the rolls.
  • the problem has been, particularly, acute in the treatment of high silicon steels and other steels which require high treatment or annealing temperatures. This problem appears to be influenced by a variety of factors including the tension of the strip, the composition of the strip, the temperature of the furnace atmosphere, as well as the characteristic of the roll surface.
  • the conveyor roll of the present invention has a structural metal body with a stabilized zirconia work engaging surface.
  • the body of the roll is of metal; a high temperature alloy of known composition desirably being employed.
  • the zirconia used for the work engaging surface must be stabilized with calcium oxide or an equivalent stabilizing agent. Unstabilized zirconia has proven unsatisfactory and is subject to the spalling problem, previously mentioned.
  • the metal roll is provided with a coating or film of Nichrome prior to the addition of the stabilized zirconia coating.
  • the metal roll body may be a hollow body such as that commonly used in conveyor rolls or it may be of any other roll design.
  • Figure 1 is a diagrammatic view of a heat treating chamber showing that a high strip can be supported on the furnace conveyor rolls of this invention
  • Figure 4 is a diagrammatic fragmentary cross section to enlarged scale of apart of the roll body of Figure '2.
  • a furnace chamber 10 through which strip 11 is adapted to be drawn, the strip passing over a series of rolls 12 at the top of the furnace and then passing over rolls 12 at the bottom of the furnace. It is desirable that the rolls be of uniform construction.
  • the rolls 12 may be driven or turned idly as the strip passes through the chamber 10.
  • the chamber 10 is heated internally by suitable heating methods not illustrated herein.
  • the furnace conveyor roll 12 includes a metal body 13 made up of a barrel 14, two shaft ends 15, andtwo closure plates 16.
  • the shaft ends 15 are filled with heat insulating material 17.
  • the barrel 14 and shaft ends 15, and the closure plates 16 may be of any suitable alloy such as is used in the manufacture of furnace conveyor elements. Preferably we use a heat resistant alloy.
  • the barrel 14 has a thin film of Nichrome 18 applied to its outer surface. This film may be applied by any conventional means, as for example, spraying.
  • the outer Work engaging surface coating .20 of stabilized zirconia is then applied to the Nichrome.
  • the coating may be applied by any known method which will provide a fused surface.
  • the stabilized zirconia may be applied by high temperature spraying and to this end a metallizing gun 19 is provided tomelt and spray the stabilized zirconia.
  • the shaft ends 15 have cylindrical portions 21 fitting within the ends of barrel 14,'tapered portions 22, cylindrical end portions 23 and trunnions 24 which may be mounted for rotation in a conventional manner.
  • the ends of the barrel 14 are welded to the ends of the shaft ends 15 by weldments 25.
  • the closure plates 17 are welded to the shaft ends 15 by weldments 26.
  • the stabilized zirconia surface 20 constitutes the working engaging surface of the roll and is the only portion of the roll which comes in contact with the strip being carried over the roll.
  • a ferrous roll body containing 25% chromium and 12% nickel was spray coated over /2 of its length with a film of -20 Nichrome (80% nickel and 20% chromium).
  • a coating of stabilized zirconia (zirconia stabilized for example with CaO) was applied to /3 of the Nichrome coated length.
  • a coating of alumina was applied to another third of the Nichrome coated length and a coating of zirconium silicate was applied to the remaining 6 of the Nichrome coated length.
  • Identical coatings of stabilized zirconia alumina and zirconium silicate were applied to the portions of the roll which did not have the Nichrome coating.
  • the roll was then subjected to cycles of temperature change such as would be encountered in heating and cooling a strip treating furnace.
  • the alumina had spalled on both Nichrome coated and uncoated areas to an extent that it would be unsatisfactory for further use.
  • the zirconium silicate showed signs of spalling in both cases but could still he used.
  • the second cycle only the stabilized zirconia on the Nichnome film remained intact. After five cycles all of the coatings had spalled 01f except the stabilized zirconia which still remained unimpaired.
  • the stabilized-zirconia coating must be applied to a roll jbodyfof proper composition and physical properties for the temperature in the particular'furnace involved.
  • the zirconia coat maybe used in certain cases without an undercoat, however, where any difliculty with spalling is encountered a Nichrome film applied to the roll surface priorto the application of the stabilized zirconia will eliminate the spalling problem.
  • a furnace conveyor roll and the like comprising a work supporting metal body and a coating of stabilized zirconia covering the work engaging portion of said body and being fixed thereto.
  • a furnace conveyor element and the like comprising a work supporting metal body and a stabilized zirconia coating on the work engaging surface of said body, said stabilized zirconia covering the entire work engaging portion of the body and being fused thereto.
  • a furnace conveyor roll and the like comprising a work supported metal body and a coating of zirconia stabilized with calcium oxide-covering the work engaging portion of said body and fused thereto.
  • a furnace conveyor element and the like comprising a work supporting ferrous body and a zirconia coating stabilized with calcium oxide on the work engaging surface of said body, said stabilized zirconia covering the entire work engaging portion of the body and being fused thereto.
  • a furnace conveyor element and the like comprising a ferrous body, a nickel chromium alloy film on the work engaging portion of said body and bonded thereto and an outer coating of zirconia stabilized with calcium oxide fused to the nickel chromium alloy film over the entire work engaging surface of the body.
  • a furnace conveyor element and the like comprising ;a ferrous body, a nickel chromium alloy film consisting essentially ofbetween about %80% nickel and between 40%-20% chromium onthe work engaging portion of said body and bonded thereto and an outer coating of stabilized zirconia fixed to the nickel chromium alloy film over the entire work engaging surface of the body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating By Spraying Or Casting (AREA)
US748320A 1958-07-14 1958-07-14 Furnace conveyor rolls and the like Expired - Lifetime US2984473A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US748320A US2984473A (en) 1958-07-14 1958-07-14 Furnace conveyor rolls and the like
BE591436A BE591436A (fr) 1958-07-14 1960-06-01 Rouleaux transporteurs et éléments analogues pour fours.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US748320A US2984473A (en) 1958-07-14 1958-07-14 Furnace conveyor rolls and the like

Publications (1)

Publication Number Publication Date
US2984473A true US2984473A (en) 1961-05-16

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US748320A Expired - Lifetime US2984473A (en) 1958-07-14 1958-07-14 Furnace conveyor rolls and the like

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BE (1) BE591436A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115335A (en) * 1961-05-15 1963-12-24 Blaw Knox Co Furnace rolls
US3240414A (en) * 1962-08-22 1966-03-15 Continental Can Co Forge rolls for fusion welding of aluminum
US3464681A (en) * 1968-03-05 1969-09-02 Vanfrido Olivotto Charge conveying device for high temperature industrial ovens
US4056873A (en) * 1975-12-19 1977-11-08 Ugine Carbone Composite guide roller for a rolling mill
US4060882A (en) * 1975-01-27 1977-12-06 Adamovske Strojirny, Narodni Podnik Cylinders and rollers for printing machines
US4470802A (en) * 1982-03-31 1984-09-11 Nippon Steel Corporation Highly buildup-resistant hearth roll for conveying a steel strip through a continuous annealing furnace and a method therefor
US4581073A (en) * 1984-04-10 1986-04-08 Allegheny Ludlum Steel Corporation Method for descaling metal strip
US4876875A (en) * 1987-12-04 1989-10-31 Coors Porcelain Company Supported ceramic guide roller
US4909485A (en) * 1986-09-05 1990-03-20 Kawasaki Steel Corp. Apparatus for continuously annealing metal strip and hearth roll therefor
US5265332A (en) * 1992-12-08 1993-11-30 Norandal Usa, Inc. Caster shell surface coating method
EP0707188A1 (fr) * 1994-10-14 1996-04-17 W. Haldenwanger Technische Keramik GmbH & Co. KG Support en sic
WO1997043591A1 (fr) * 1996-05-14 1997-11-20 Bricmont, Inc. Agencement de four comportant un rouleau a sec
US6709372B2 (en) * 2001-03-06 2004-03-23 Usinor Roller for metal strip transfer in a continuous annealing furnace
US20220268521A1 (en) * 2021-02-25 2022-08-25 Benteler Maschinenbau Gmbh Furnace roller and roller furnace

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1578254A (en) * 1924-06-26 1926-03-30 Thomas E Murray Protection of metals against corrosion
US1861489A (en) * 1930-02-17 1932-06-07 William Swindell And Brothers Conveying apparatus
US2151048A (en) * 1937-05-01 1939-03-21 Aluminum Co Of America Drying roll
US2624097A (en) * 1951-01-09 1953-01-06 Norton Co Method of making dense, hard, abrasion resistant ceramic articles
US2695248A (en) * 1948-12-15 1954-11-23 Blaw Knox Co Furnace conveyer element and manufacture thereof
US2848349A (en) * 1955-08-02 1958-08-19 Armour Res Found Flame spraying process

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1578254A (en) * 1924-06-26 1926-03-30 Thomas E Murray Protection of metals against corrosion
US1861489A (en) * 1930-02-17 1932-06-07 William Swindell And Brothers Conveying apparatus
US2151048A (en) * 1937-05-01 1939-03-21 Aluminum Co Of America Drying roll
US2695248A (en) * 1948-12-15 1954-11-23 Blaw Knox Co Furnace conveyer element and manufacture thereof
US2624097A (en) * 1951-01-09 1953-01-06 Norton Co Method of making dense, hard, abrasion resistant ceramic articles
US2848349A (en) * 1955-08-02 1958-08-19 Armour Res Found Flame spraying process

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115335A (en) * 1961-05-15 1963-12-24 Blaw Knox Co Furnace rolls
US3240414A (en) * 1962-08-22 1966-03-15 Continental Can Co Forge rolls for fusion welding of aluminum
US3464681A (en) * 1968-03-05 1969-09-02 Vanfrido Olivotto Charge conveying device for high temperature industrial ovens
US4060882A (en) * 1975-01-27 1977-12-06 Adamovske Strojirny, Narodni Podnik Cylinders and rollers for printing machines
US4056873A (en) * 1975-12-19 1977-11-08 Ugine Carbone Composite guide roller for a rolling mill
US4470802A (en) * 1982-03-31 1984-09-11 Nippon Steel Corporation Highly buildup-resistant hearth roll for conveying a steel strip through a continuous annealing furnace and a method therefor
US4581073A (en) * 1984-04-10 1986-04-08 Allegheny Ludlum Steel Corporation Method for descaling metal strip
EP0158474A3 (en) * 1984-04-10 1986-10-01 Allegheny Ludlum Steel Corporation Method and apparatus for descaling metal strip
US4909485A (en) * 1986-09-05 1990-03-20 Kawasaki Steel Corp. Apparatus for continuously annealing metal strip and hearth roll therefor
US4876875A (en) * 1987-12-04 1989-10-31 Coors Porcelain Company Supported ceramic guide roller
US5265332A (en) * 1992-12-08 1993-11-30 Norandal Usa, Inc. Caster shell surface coating method
EP0707188A1 (fr) * 1994-10-14 1996-04-17 W. Haldenwanger Technische Keramik GmbH & Co. KG Support en sic
WO1997043591A1 (fr) * 1996-05-14 1997-11-20 Bricmont, Inc. Agencement de four comportant un rouleau a sec
US5833455A (en) * 1996-05-14 1998-11-10 Bricmont, Inc. Dry roll furnace arrangement
US6709372B2 (en) * 2001-03-06 2004-03-23 Usinor Roller for metal strip transfer in a continuous annealing furnace
US20220268521A1 (en) * 2021-02-25 2022-08-25 Benteler Maschinenbau Gmbh Furnace roller and roller furnace

Also Published As

Publication number Publication date
BE591436A (fr) 1960-10-03

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