EP0469803A1 - Water-cooled rolls - Google Patents

Water-cooled rolls Download PDF

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Publication number
EP0469803A1
EP0469803A1 EP91306868A EP91306868A EP0469803A1 EP 0469803 A1 EP0469803 A1 EP 0469803A1 EP 91306868 A EP91306868 A EP 91306868A EP 91306868 A EP91306868 A EP 91306868A EP 0469803 A1 EP0469803 A1 EP 0469803A1
Authority
EP
European Patent Office
Prior art keywords
metal
metal oxide
roll
water
matrix
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.)
Ceased
Application number
EP91306868A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hideo C/O Union Carbide Services K.K. Nitta
Mamoru C/O Union Carbide Services K.K. Hisada
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.)
Praxair ST Technology Inc
Original Assignee
Union Carbide Coatings Service Technology Corp
Praxair ST Technology Inc
Union Carbide Coatings Service Corp
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 Union Carbide Coatings Service Technology Corp, Praxair ST Technology Inc, Union Carbide Coatings Service Corp filed Critical Union Carbide Coatings Service Technology Corp
Publication of EP0469803A1 publication Critical patent/EP0469803A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • 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
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements

Definitions

  • This invention relates to a technique for improving the surface quality of water-cooled rolls to be used for cooling steel sheets in heat-treating furnaces.
  • Continuous annealing furnaces for steel sheets are provided with a quenching zone to help produce well-aged cold-rolled sheets or the like.
  • One method of cooling in that zone uses water-cooled rolls.
  • Figure 1 is a schematic view of a roll type cooling arrangement.
  • An array of internally water-cooled metal rolls 1 cools a steel sheet 2 as the latter passes in direct contact with the rolls, under control such that the work is cooled down to a given finish temperature.
  • the water-cooled rolls hitherto used have been metal rolls.
  • the metal rolls however have not been fully satisfactory.
  • they have questionable durability to cope with the heat cycles involving contact with high-temperature steel sheets and internal water cooling.
  • they are not quite resistant to the surface wear due to friction with the steel sheets usually conveyed under tension ranging from about 0.5 to about 3 kg/cm2.
  • metal carbide coatings have high thermal conductivity values, and the non-uniformity of surface roughness has a material bearing upon the irregularity of thermal conductivity on contact in the width direction of the rolls. This effect can result in an uneven rate of cooling in the width direction of steel sheets.
  • the metal oxides are low enough in thermal conductivity to prevent the non-uniformity of surface roughness from influencing the evenness of the cooling rate in the width direction of steel sheets.
  • the metal oxide coatings exhibit such poor peeling resistance under service conditions that they require a double-layer bonding coat about 200 ⁇ m thick. If desirable effects are to be achieved, the sprayed metal oxide coating itself must have a thickness of at least 200 ⁇ m.
  • the present invention provides the application of a cermet sprayed coating of a metal oxide and a heat-resisting metal or heat-resisting alloy matrix to water-cooled rolls of the character described above.
  • a water-cooled roll for cooling steel sheets wherein the roll surface that comes in contact with the steel sheets is spray-coated with a cermet composed of a metal oxide having a higher hardness and lower thermal conductivity than metals and a metal matrix of Ni- or Co-base heat-resisting alloy.
  • the metal roll may be built of any known material usually used for the purposes, e.g., carbon steel or heat-resisting cast steel.
  • the sprayed coating can easily be formed by any known spraying technique, which involves spraying the materials, a metal oxide powder and a heat-resisting metal or alloy powder, onto a metal roll surface.
  • Useful metal oxides for use in the present invention include alumina, chromia, zirconia, and silica.
  • Alumina is preferred because of its superior resistance to heat and wear.
  • metal matrix materials which are used in the present invention are Ni- and Co-base heat-resisting alloys.
  • the high heat resistance and good binding properties with respect to the substrate make CoCrYTa and CoCrAlYTa particularly suitable.
  • the ratio of the metal oxide to the matrix ranges from 10:90 to 70:30, preferably from 30:70 to 60:40. A ratio chosen from this range permits the formation of a coating with an appropriately selected thermal conductivity and excellent exfoliation resistance. Thus, the uniformity of the thermal conductivity in the width direction of the roll can be secured.
  • Table 1 lists desirable examples of spray material compositions according to the present invention.
  • the sprayed coating formed in conformity with the invention is so adherent to the substrate that a bonding coat is not always necessary. Where necessary, a single-layer coat as thin as 30 ⁇ m or less in thickness is satisfactory.
  • Figs. 2 and 3 illustrate the construction of a water-cooled roll 10 according to the present invention.
  • a conventional metal roll 11 which is cooled inside with water has a sprayed cermet coating 12 on the surface.
  • the sprayed coating 12, as shown in Fig.3, comprises metal oxide particles 13 dispersed in a matrix 14 of a heat-resisting metal or alloy.
  • Coating materials of the compositions shown in Table 1 were prepared and applied to steel rolls by spray coating to form coatings about 50 ⁇ m thick.
  • thermal shock resistance was evaluated in terms of the number of thermal shock cycles, (each of which consisting of holding each test specimen at 900°C for 20 minutes and then placing it into water at 20°C), that the specimen withstood until its coating was peeled off.
  • the cermet type sprayed coatings have considerably low thermal conductivity values compared with the metal types and attain a soaking effect. Consequently, the former can accomplish uniform cooling regardless of variations in the coarseness of roller surface and in the thickness of coating.
  • Specimens 1 and 6 were further tested for wear resistance. The test was carried out by subjecting each specimen to 200 cycles of sliding runs at 1070°C and then measuring the abrasion quantity. By way of comparison, the sprayed coating of Cr3C2 + Ni-Cr, a dispersed system rather than an oxide system, was likewise tested. Table 4 shows the results.
  • the abrasion quantities indicate that the coatings composed of an oxide and a metal matrix were outstandingly resistant to wear.
  • the adjustment of the metal oxide content in a metal matrix makes it possible to choose a proper thermal conductivity and secure the uniformity of thermal conductivity in the width direction of the roll.
  • the spray coating has only to form a single layer rather than two over a water-cooled roll, and the sprayed coating may be as thin as 30 ⁇ m thick, thus making for a reduction of the spraying cost.
  • the sprayed cermet coatings according to the invention are superior in high-temperature wear resistance to the metal carbide systems and exhibit greater thermal shock resistance than metal oxide coatings.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP91306868A 1990-07-27 1991-07-26 Water-cooled rolls Ceased EP0469803A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1990079303U JPH0437256U (enExample) 1990-07-27 1990-07-27
JP79303/90 1990-07-27

Publications (1)

Publication Number Publication Date
EP0469803A1 true EP0469803A1 (en) 1992-02-05

Family

ID=13686077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91306868A Ceased EP0469803A1 (en) 1990-07-27 1991-07-26 Water-cooled rolls

Country Status (4)

Country Link
EP (1) EP0469803A1 (enExample)
JP (1) JPH0437256U (enExample)
KR (1) KR960006015B1 (enExample)
CA (1) CA2047519C (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10280499B2 (en) 2014-12-30 2019-05-07 Industrial Technology Research Institute Composition and coating structure applying with the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091292A1 (en) * 1982-03-31 1983-10-12 British Steel Corporation Ceramic coated rolls
WO1987002389A2 (en) * 1985-10-18 1987-04-23 Union Carbide Corporation High volume fraction refractory oxide, thermal shock resistant coatings

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0745703B2 (ja) * 1987-02-13 1995-05-17 新日本製鐵株式会社 高温耐用性溶射被覆部材

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091292A1 (en) * 1982-03-31 1983-10-12 British Steel Corporation Ceramic coated rolls
WO1987002389A2 (en) * 1985-10-18 1987-04-23 Union Carbide Corporation High volume fraction refractory oxide, thermal shock resistant coatings

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 328 (C-383)[2384], 7th November 1986; & JP-A-61 136 634 (KOBE STEEL) 24-06-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 13, no. 187 (C-592), 2nd May 1989; & JP-A-1 11 956 (NIPPON STEEL) 17-01-1989 *
PATENT ABSTRACTS OF JAPAN, vol. 13, no. 365 (M-859), 15th August 1989; & JP-A-1 122 611 (NIPPON STEEL) 15-05-1989 *
PATENT ABSTRACTS OF JAPAN, vol. 13, no. 63 (C-568), 13th February 1989; & JP-A-63 255 352 (KAWASAKI STEEL) 21-10-1988 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 172 (C-237), 9th August 1984; & JP-A-59 70 712 (SHIN NIPPON) 21-04-1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10280499B2 (en) 2014-12-30 2019-05-07 Industrial Technology Research Institute Composition and coating structure applying with the same

Also Published As

Publication number Publication date
CA2047519A1 (en) 1992-01-28
KR920002242A (ko) 1992-02-28
CA2047519C (en) 1999-01-19
JPH0437256U (enExample) 1992-03-30
KR960006015B1 (ko) 1996-05-08

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