EP1241274B1 - Hitzeschild für vertikalen Durchlaufglühofen - Google Patents

Hitzeschild für vertikalen Durchlaufglühofen Download PDF

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Publication number
EP1241274B1
EP1241274B1 EP20010302309 EP01302309A EP1241274B1 EP 1241274 B1 EP1241274 B1 EP 1241274B1 EP 20010302309 EP20010302309 EP 20010302309 EP 01302309 A EP01302309 A EP 01302309A EP 1241274 B1 EP1241274 B1 EP 1241274B1
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EP
European Patent Office
Prior art keywords
double
tube
roll
furnace
heat shielding
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
EP20010302309
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English (en)
French (fr)
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EP1241274A1 (de
Inventor
Naoto Tokyo Head Off. Kawasaki Steel Corp. Ueno
S. Tokyo Head Off. Kawasaki Steel Corp. Iida
Takaaki Chiba Works Kawasaki Steel Corp Kobashi
Motoki Chiba Works Kawasaki Steel Corp. Imamura
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JFE Steel Corp
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JFE Steel Corp
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Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to DE2001615379 priority Critical patent/DE60115379T2/de
Priority to EP20010302309 priority patent/EP1241274B1/de
Publication of EP1241274A1 publication Critical patent/EP1241274A1/de
Application granted granted Critical
Publication of EP1241274B1 publication Critical patent/EP1241274B1/de
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    • 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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • C21D9/562—Details

Definitions

  • This invention relates to a heat shielding apparatus for a vertical continuous annealing furnace in which heat treatment is performed on a metal strip while the strip is continuously transported.
  • an annealing process for recrystallizing steel strip after being subjected to cold rolling and for imparting good workability to the steel strip has been primarily carried out by continuous annealing instead of batch annealing.
  • a continuous annealing furnace for carrying out the continuous annealing there are known horizontal continuous annealing furnaces, in which annealing is performed on a strip traveling along a horizontal pass, and vertical continuous annealing furnaces, in which a plurality of rolls are arranged in upper and lower portions of the furnace and annealing is performed on a strip traveling along a vertical pass.
  • the vertical furnace is more advantageous for a mass-production process that is realized by increasing the passing (threading) speed of the strip.
  • indirect heating using a radiant tube is prevalent as a heating source for the vertical continuous annealing furnace, and steel strip is mainly heated with radiant heat from the heating source.
  • each roll 12 arranged in the furnace is designed to have a convex roll crown with both shoulders tapered toward the ends.
  • This design is intended to make the steel strip pass the furnace so that the strip always travels in match with the roll center, by utilizing a centering force (arrow F) acting on the strip, which has ridden over a tapered portion, in a direction from the roll edge toward the roll center based on a self-centering motion of the strip wound on the tapered portion of the roll with angle.
  • a heating source e.g., a radiant tube
  • a thermal crown a crown imparted by the radiant heat from the heating source
  • Japanese Unexamined Patent Application Publication No. 57-79123 discloses a shielding apparatus employing a heat-resistant tube through which air, nitrogen gas or the like, flows for cooling.
  • Japanese Unexamined Patent Application Publication No. 52-71318 discloses a technique for spraying cooling gas to the roll to control the thermal crown in a positive way.
  • Japanese Unexamined Patent Application Publication No. 53-119208 discloses a technique for water-cooling a roll edge portion, or changing a thermal conductivity between the roll central portion and the roll edge portion.
  • Japanese Unexamined Patent Application Publication No. 53-130210 and Japanese Examined Patent Publication No. 57-23733 disclose techniques for arranging, separately from the rolls, a cooling apparatus that forms a cooling flow path.
  • An object of this invention is to provide an inexpensive and more efficient apparatus on the basis of the radiant heat shielding apparatus employing a cooling tube, which is disclosed in the above-cited Japanese Unexamined Patent Application Publication No. 57-79123, for example.
  • a heat shielding apparatus according to the preamble of claim 1 is disclosed in the above-mentioned Japanese Unexamined Patent Application Publication No. 53-130210.
  • a heat shielding apparatus suitable for a vertical continuous annealing furnace including upper and lower portions and a plurality of rolls arranged in the upper and lower portions, wherein heat treatment is performed on a metal strip continuously transported in the vertical direction by the rolls while changing the direction of travel from upward to downward, or from downward to upward, as the metal strip turns around each of the rolls, and wherein the heat shielding apparatus can be positioned just below a roll in the upper portion of the furnace and/or just above a roll in the lower portion of the furnace, the heat shielding apparatus comprising:
  • this invention provides a radiant heat shielding apparatus for a vertical continuous annealing furnace, in which a plurality of rolls are arranged in upper and lower portions of the furnace and heat treatment is performed on a metal strip continuously transported by the rolls.
  • the strip is transported in the vertical direction by the rolls while changing the travel direction from upward to downward, or from downward to upward, as the metal strip turns around each of the rolls.
  • the radiant heat shielding apparatus is disposed below the roll positioned in the upper portion of the furnace, and/or above the roll positioned in the lower portion of the furnace, for intercepting heat radiated from a heating source provided within the furnace.
  • the radiant heat shielding apparatus is positioned just below the roll in the upper position of the furnace, and/or just above the roll in the lower portion of the furnace.
  • the radiant heat shielding apparatus comprises a double-walled tube including an inner tube having an outside atmosphere suction port projected horizontally or downward to be exposed to an outside atmosphere, and an outer tube having an exhaust port projected upward to be exposed to the outside atmosphere.
  • some embodiments of the radiant heat shielding apparatus comprise a plurality of double-walled tubes as described above.
  • the double-walled tubes are horizontally arranged just below the roll positioned in the upper portion of the furnace and/or just above the roll positioned in the lower portion of the furnace.
  • the radiant heat shielding apparatus comprises one or more double-walled tubes as described above, and the double-walled tubes are used as support tubes and a shield plate is attached to the support tubes.
  • a radiant heat shielding apparatus of this invention is disposed below (preferably just below) a roll positioned in an upper portion of a vertical continuous annealing furnace, and/or positioned above (preferably just above) a roll positioned in a lower portion of the furnace, for intercepting heat radiated from a heating source that is provided within the furnace, and the heat shielding apparatus is almost parallel to the roll.
  • the radiant heat shielding apparatus has a structure of a double-walled tube 20 comprising an inner tube 22 having an outside atmosphere suction port 23 projected downward to be exposed to an outside atmosphere, and an outer tube 24 having an exhaust port 25 projected upward to be exposed to the outside atmosphere.
  • an inexpensive and more efficient radiant heat shielding apparatus can be realized by effectively utilizing natural convection of the outside atmosphere (e.g., air).
  • Heat-resistant alloy steel is an exemplary suitable material for forming the double-walled tube 20.
  • stainless steel having a Cr content of not less than about 18 wt% and a Ni content of not less than about 8 wt%, or special steel having high heat resistance are preferred materials.
  • Japanese Unexamined Patent Application Publication No. 57-79123 discloses that air for cooling is forced to flow into the cooling tube by a suction blower, or by a pressure blower.
  • a suction blower or by a pressure blower.
  • the blower sucks exhaust gas at high temperatures, and therefore the blower must itself be made heat-resistant, or else a device for cooling suction gas must be provided upstream of the blower. In any case, the equipment cost is necessarily increased.
  • a pressure blower is used to force the cooling air to flow into the cooling tube, there is risk that a metal (or steel) strip is oxidized due to leakage of the air from the cooling tube into the furnace.
  • the inventors fabricated radiant heat shielding apparatuses having three types of structures shown in Fig. 2, and conducted tests on those actual apparatuses.
  • the left side of Fig. 2 represents a conventional example using a shield plate 16 in the form of a simple flat plate.
  • a strip 10 typically, a steel strip
  • a roll 12 arranged in a furnace
  • a heating source 14 typically, a radiant tube
  • the center of Fig. 2 represents a comparative example using a cooling tube 18 in the form of a simple straight double-walled tube.
  • the right side of Fig. 2 represents the first embodiment of this invention including a cooling tube 20 in the form of the double-walled tube shown in Fig. 1.
  • Fig. 3 is a graph showing test results obtained by measuring a surface temperature of an outer tube of each double-walled tube and a flat plate (on the side facing the roll 12 arranged in the furnace), which is represented by the vertical axis, relative to a flow rate of cooling gas (air) measured at the exhaust port of the outer tube of each double-walled tube, which is represented by the horizontal axis.
  • Measurement conditions were set such that the furnace temperature was 900°C, the temperature of the outside atmosphere (cooling gas) was 300°C, the outer tube diameter of the double-walled tube was 100 mm, the inner tube diameter of the double-walled tube was 40 mm, and the level difference H between the outside atmosphere suction port 23 and the exhaust port 25 of the double-walled tube was 200 mm.
  • the surface temperature of the flat plate reached 860 °C.
  • the flow rate of the cooling gas reached to 5.0 ⁇ 10 -3 (Nm 3 /s) and the surface temperature of the outer tube was reduced down to about 500°C.
  • Fig. 4 is a graph showing the relationship between the flow rate of cooling gas (air) measured at the exhaust port of the outer tube of the double-walled tube according to this invention and a temperature difference ⁇ T developed on a temperature measuring roll in the width direction of a strip.
  • the roll temperature measured had thermocouples embedded therein in the width direction of the roll and was positioned just above the radiant heat shielding apparatus which is almost parallell to the roll. Measurement conditions were set such that the length of a roll barrel was 2000 mm, the average width of steel strips passed through the furnace was 1260 mm, and the average furnace temperature was 900°C.
  • the graph of Fig. 4 shows that the minimum temperature difference ⁇ T, at which the roll crown is rendered concave and the steel strip undergoes snaking, is about 150°C, and that the flow rate of the cooling gas required for preventing snaking of the steel strip is not less than 3.0 ⁇ 10 -3 (Nm 3 /s).
  • the outside atmosphere suction port is described as being projected downward.
  • the outside atmosphere suction port is not limited to such an arrangement.
  • the outside atmosphere suction port may alternatively be projected at a different orientation, e.g., horizontally.
  • the chimney effect developed on a flow in the double-walled tube from suction of the outside atmosphere to exhaust thereof is utilized to satisfy the above-mentioned required flow rate of the cooling gas.
  • the flow rate Q of the cooling gas is proportional to the outer diameter D of the outer tube and is also proportional to the square root of the level difference H between the outside atmosphere suction port and the exhaust port of the double-walled tube.
  • Fig. 5 is a graph plotting actually measured data representing the relationship between the parameter D 2 ⁇ (H) indicated by the horizontal axis, and the flow rate Q (Nm 3 /s) of the cooling gas, indicated by the vertical axis.
  • the graph of Fig. 5 shows that D 2 ⁇ (H) ⁇ 2.2 x 10 -3 is needed to satisfy the required flow rate Q of the cooling gas that is not less than about 3.0 ⁇ 10 -3 (Nm 3 /s).
  • the furnace temperature ranges from about 500°C to about 900°C during actual operation, and when the furnace is within this temperature range, the flow rate of the cooling gas not less than the above-mentioned value is sufficient to achieve the desired cooling.
  • D 2 ⁇ (H) ⁇ 2.2 ⁇ 10 -3 is satisfied, a sufficient cooling effect can be provided during actual operation.
  • Fig. 6 is a graph showing the relationship between the flow rate Q (Nm 3 /s) of the cooling gas and the level difference H (mm) between the outside atmosphere suction port and the exhaust port of the double-walled tube.
  • the graph of Fig. 6 shows that if the level difference is less than about 150 mm, the cooling gas becomes difficult to flow because the level difference H is substantially at the same level as that corresponding to the diameter of the double-walled tube. Therefore, the level difference H between the outside atmosphere suction port and the exhaust port of the double-walled tube is preferably set to be not less than about 150 mm.
  • the outer diameter of the outer tube of the double-walled tube is small, the outer tube is more easily susceptible to creep due to the radiant heat. From the actual operation of the invention experienced so far, it has been confirmed that the outer diameter of the outer tube is preferably not less than about 60 mm.
  • outer diameter ratio between the outer tube and the inner tube of the double-walled tube is preferably in the range of from about 2.0 to about 4.0.
  • the outer tube is preferably made of stainless steel having a Cr content of not less than about 18 wt% and a Ni content of not less than about 8 wt%, which is represented by, for example, SUS304, SUS316 and SUS316L according to the JIS (Japanese Industrial Standards).
  • the outside atmosphere suction port of the double-walled tube is preferably spaced about 100 mm or more from the furnace wall.
  • a plurality of double-walled tubes 20 are arranged side-by-side horizontally just below the roll positioned in the upper portion of the furnace, and/or positioned just above the roll positioned in the lower portion of the furnace.
  • Figs. 7 and 8 also show the arrangement of rolls 12, heating sources 14 and strips 10.
  • the double-walled tube shown in Fig. 1 was fabricated using SUS316 stainless steel.
  • the double-walled tube had an outer diameter D of the outer tube of 114.3 mm, an inner diameter of the outer tube of 97.1 mm, an outer diameter of the inner tube of 48.0 mm, and an inner diameter of the inner tube of 41.2 mm.
  • the level difference H between the outside atmosphere suction port and the exhaust port of the double-walled tube was 200 mm.
  • a plurality of radiant heat shielding apparatuses each comprising the double-walled tube thus fabricated were installed in upper and lower stages of a heating zone of a vertical continuous annealing furnace, as shown in Fig. 13.
  • the radiant heat shielding apparatus was installed in the upper stage of the heating zone at a level spaced 400 mm from each roll just below it. Also, the radiant heat shielding apparatus was installed in the lower stage of the heating zone at a level spaced 400 mm from each roll just above it. The shielding effect of the actually installed radiant heat shielding apparatus was measured by operating the furnace for about two years under ordinary conditions.
  • Fig. 9 incidence of snaking
  • Fig. 10 replacement frequency of the radiant heat shielding apparatus.
  • the incidence of snaking is reduced down to about 1/3 as compared with both the conventional and comparative radiant heat shielding apparatuses using respectively a flat plate and a simple cooling tube.
  • the useful life of the radiant heat shielding apparatus is greatly prolonged in this invention as compared with both the conventional and comparative apparatuses, because the cooling action is enhanced in this invention by effectively utilizing the chimney effect developed on a flow in the cooling tube from suction of the outside atmosphere to exhaust thereof.
  • the radiant heat shielding apparatus of this invention including double-walled tubes 20 is disposed in the upper stage at a position between adjacent passes, i.e., at a position not just below each roll 12, as well.
  • the shielding effect can be increased by so arranging the radiant heat shielding apparatus.
  • this invention can provide a radiant heat shielding apparatus, which is inexpensive, effective in preventing snaking of a strip, and has the prolonged useful life, because of effective utilization of the chimney effect that is developed for flow in a double-walled cooling tube from suction of an outside atmosphere to exhaust thereof.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (3)

  1. Wärmeabschirmvorrichtung, die sich für einen vertikalen Durchlaufglühofen eignet mit einem oberen und einem unteren Abschnitt und einer Mehrzahl im oberen und unteren Abschnitt angeordneter Walzen, wobei die Wärmebehandlung an einem Metallstreifen (10) vorgenommen wird, der von den Walzen stetig in Vertikalrichtung transportiert wird, wobei sich die Wanderungsrichtung von aufwärts nach abwärts oder von abwärts nach aufwärts ändert, während sich der Metallstreifen (10) um jede der Walzen dreht, und wobei die Wärmeabschirmvorrichtung gerade unterhalb einer Walze (12) im oberen Abschnitt des Ofens und/oder gerade oberhalb einer Walze (12) im unteren Abschnitt des Ofens angebracht werden kann, wobei die Wärmeabschirmvorrichtung umfasst:
    mindestens eine doppelwandige Röhre (20), wobei jede doppelwandige Röhre umfasst:
    eine innere Röhre (22) mit einer Ansaugöffnung (23) für Außenatmosphäre, die horizontal oder abwärts verläuft, so dass sie der Außenatmosphäre ausgesetzt ist, und eine äußere Röhre (24) mit einer für die Außenatmosphäre zugänglichen Ausstoßöffnung (25);
    dadurch gekennzeichnet, dass die Ausstoßöffnung (25) jeder doppelwandigen Röhre (20) aufwärts verläuft, und dass die äußere Röhre (24) jeder doppelwandigen Röhre (20) einen Außendurchmesser nicht unter etwa 60 mm und einen Höhenunterschied H zwischen der Ansaugöffnung (23) für Außenatmosphäre und der Ausstoßöffnung (25) jeder doppelwandigen Röhre (20) nicht unter etwa 150 mm hat und der Außendurchmesser D (Einheit: m) der äußeren Röhre (24) jeder doppelwandigen Röhre (20) und der Höhenunterschied H (Einheit: m) die Beziehung erfüllen: D2 x (H) ≥ 2,2 x 10-3.
  2. Wärmeabschirmvorrichtung nach Anspruch 1, wobei jede doppelwandige Röhre (20) als Stützröhre verwendbar ist und eine Abschirmplatte (30) an jeder Stützröhre angebracht ist.
  3. Vertikaler Durchlaufglühofen, umfassend:
    einen oberen und einen unteren Abschnitt;
    eine Mehrzahl im oberen und unteren Abschnitt angebrachter Walzen;
    wobei die Wärmebehandlung an einem Metallstreifen (10) vorgenommen wird, der von den Walzen stetig in Vertikalrichtung transportiert wird, wobei sich die Wanderungsrichtung von aufwärts nach abwärts oder von abwärts nach aufwärts ändert, während sich der Metallstreifen (10) um jede der Walzen dreht; und
    eine Wärmeabschirmvorrichtung nach einem vorhergehenden Anspruch, die gerade unterhalb einer im oberen Abschnitt des Ofens befindlichen Walze und/oder gerade oberhalb einer im unteren Abschnitt des Ofens befindlichen Walze angebracht ist.
EP20010302309 2001-03-13 2001-03-13 Hitzeschild für vertikalen Durchlaufglühofen Expired - Lifetime EP1241274B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2001615379 DE60115379T2 (de) 2001-03-13 2001-03-13 Wärmeabschirmvorrichtung für einen vertikalen durchlaufglühofen
EP20010302309 EP1241274B1 (de) 2001-03-13 2001-03-13 Hitzeschild für vertikalen Durchlaufglühofen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20010302309 EP1241274B1 (de) 2001-03-13 2001-03-13 Hitzeschild für vertikalen Durchlaufglühofen

Publications (2)

Publication Number Publication Date
EP1241274A1 EP1241274A1 (de) 2002-09-18
EP1241274B1 true EP1241274B1 (de) 2005-11-30

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EP20010302309 Expired - Lifetime EP1241274B1 (de) 2001-03-13 2001-03-13 Hitzeschild für vertikalen Durchlaufglühofen

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EP (1) EP1241274B1 (de)
DE (1) DE60115379T2 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53130210A (en) * 1977-04-20 1978-11-14 Chugai Ro Kogyo Kaisha Ltd Continuous vertical heat treating furnace having roll chamber
JPS5779123A (en) * 1980-10-31 1982-05-18 Kawasaki Steel Corp Continuous annealing method for cold rolled steel strip and its device
JPS6184332A (ja) * 1984-10-03 1986-04-28 Kawasaki Steel Corp 金属ストリツプの連続焼鈍炉
JP2914840B2 (ja) * 1993-02-26 1999-07-05 新日本製鐵株式会社 連続焼鈍炉におけるハースロールのクラウン制御方法

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Publication number Publication date
EP1241274A1 (de) 2002-09-18
DE60115379D1 (de) 2006-01-05
DE60115379T2 (de) 2006-07-06

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