EP0170542A1 - Korrosionsschutzverfahren an einem festen Metall, Anwendung beim Walzen - Google Patents

Korrosionsschutzverfahren an einem festen Metall, Anwendung beim Walzen Download PDF

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Publication number
EP0170542A1
EP0170542A1 EP85401110A EP85401110A EP0170542A1 EP 0170542 A1 EP0170542 A1 EP 0170542A1 EP 85401110 A EP85401110 A EP 85401110A EP 85401110 A EP85401110 A EP 85401110A EP 0170542 A1 EP0170542 A1 EP 0170542A1
Authority
EP
European Patent Office
Prior art keywords
inerting
enclosure
inert gas
rolling
carried out
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.)
Granted
Application number
EP85401110A
Other languages
English (en)
French (fr)
Other versions
EP0170542B1 (de
Inventor
Jean Michel Naud
Gilles Vernet
Albert-Gilbert Goursat
Bruno Wagner
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to AT85401110T priority Critical patent/ATE36976T1/de
Publication of EP0170542A1 publication Critical patent/EP0170542A1/de
Application granted granted Critical
Publication of EP0170542B1 publication Critical patent/EP0170542B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/006—Gas treatment of work, e.g. to prevent oxidation or to create surface effects

Definitions

  • the present invention relates to a method and an installation for protecting a solid metal against oxidation during a rolling operation.
  • the present invention aims to remedy these drawbacks by providing a method making it possible to obtain, by very simple means, protection of the metal against oxidation during a laminate operation.
  • this method of protecting a solid metal against oxidation during a rolling operation by means of a strip rolling train or a planetary rolling mill is characterized in that the 'blank to be laminated, upstream of one or more rolling stands, through an enclosure into which an inert gas is permanently injected.
  • the entire waiting table situated upstream of the finishing stand is inerted.
  • inerting is carried out in enclosures situated respectively upstream and downstream of the pusher rolls themselves located upstream of the working rolls.
  • the invention also relates to an installation for implementing the method according to the invention, characterized in that it includes inerting chambers supplied with inert gas and enclosing the waiting table, in the case where the rolling is carried out by means of a band train, or located on either side of the pusher rolls, around the blanks to be laminated, when rolling is carried out using a planetary rolling mill.
  • FIG. 1 there is shown an installation for laminating slabs successively comprising an oven 1, a coarse-grained cage 2, a waiting table 3, a finishing cage 4 and a cooler 5, through which successively slabs 6 are to be laminated.
  • the entire waiting table 3 is enclosed in an inerting enclosure 7 which comprises, above the actual table 3, several inert gas distribution chambers 8 arranged at the top from the inerting enclosure 7 and directing, towards the slabs 6 located on the waiting table 3, streams of inert gas whose flow rate can be adjusted individually or globally.
  • These distribution chambers 8 are connected together, via pipes 9, to a source 10 of inert gas, which may be nitrogen.
  • the method according to the invention thus makes it possible to limit the formation of scale on the slabs 6 located on the waiting table 3, before their passage in the finishing train 4.
  • the method according to the invention is applied to the inerting of slabs rolled by means of a planetary rolling mill.
  • This rolling mill comprises, at the outlet of a mechanical descaling machine 11, a first set of pusher rolls 12, which is followed by a set of working rolls 13.
  • inerting chambers 15 and 16 similar in principle to the inerting chamber 7, the inerting chamber 15 being disposed between the descaler 11 and the set of pusher rolls 12 while the another inerting enclosure 16 is disposed between the pusher cylinders 12 and the set of working cylinders 13.
  • each of the inerting enclosures 15, 16 comprises several distribution chambers 8 arranged above the slab and directing to the latter, inert gas streams from corresponding sources 10.
  • Figures 3A and 3B show a schematic view of an embodiment of a distribution chamber 8 according to the invention.
  • This, of parallelepiped shape is connected by a pipe 9 to the source of inert gas, and extends parallel and transversely above the steel slabs.
  • Line 9 opens into an expansion chamber 108 limited by a vertical partition 18 connected to the upper face 109 of said chamber 8.
  • This partition is placed in front of the inlet of inert gas, under pressure, and is responsible for ensuring expansion of this gas, so that the pressure P1 in the chamber 108 is lower than atmospheric pressure.
  • the width of this partition (its dimension parallel to the slot 21) will preferably be less than 5 times the diameter D of the pipe 9, the latter opening into a vertical plane of symmetry of the chamber 8, plane perpendicular to the slot 21 , so as to ensure a symmetry of distribution of the inert gas in said chamber.
  • the distance d 3 between the partition 18 and the pipe 9 is such that the pressure variation between the expansion chamber 108 and the distribution chamber 8 is less than or equal to 0.4 mbar.
  • the lower edge of the partition 18 defines, with the walls 110 and 111, as well as the partition 19, the distribution chamber of the inert gas, in which the gas pressure is homogenized.
  • This partition 19 is integral with the face 111 of the chamber 8, over its entire length.
  • the partitions 18 and 19 by virtue of their positions and their relative dimensions (the partition 19 ends in a horizontal edge situated at a distance d l above the lower edge of the partition 18) defining a first baffle for the passage of inert gas.
  • the section in a vertical plane of the expansion chamber (ie d3 xd 4 ) will be substantially equal to the section of the first baffle (ie d 2 xd l ) in order to avoid any phenomenon of gas acceleration.
  • the walls 109, 112 and the partition 19 define a gas distribution chamber 102, creating a second baffle in the path of said gas which must escape through the slot 21, of adjustable width, located on the underside 111 of the chamber 8, said slot extending over the entire width of the chamber 8, parallel to the edges of the latter.
  • the pressure P2 in this chamber is such that the pressure difference (P2 - Pl) imposes a gas ejection speed through the slot 21 of less than 0.5 m / s.
  • the greater or lesser width of this slot makes it possible to vary the flow rate, at constant gas speed.
  • the flap 22 which controls the opening of the slot can advantageously cooperate with the oxygen measurement circuit in the vicinity of the slab mentioned below.
  • the flow rate of inert gas for example nitrogen
  • inert gas can be adjusted automatically as a function of the partial pressure of oxygen in the vicinity of the slab.
  • the oxygen concentration near the slab is measured using a probe, the signal of which is compared to a set value.
  • This regulation can be carried out for all of the distribution chambers 8 of the same inerting enclosure (using a single probe) or preferably individually for each of these chambers 8. In this case, this allows compare the value measured by each oxygen sensor with a different setpoint value for each room. We can for example tolerate more oxygen at the ends of the waiting table than in the central part.
  • the slabs 6 arrive from the furnace with a curved shape upwards, at their front part . Therefore, these slabs 6 could strike the front and transverse wall 7a, located in amnt, of each inerting enclosure 7.
  • the upper part of the inerting enclosure 7 is pivotally mounted about a horizontal and longitudinal axis 23 extending on one side of the waiting table 3 and this upper part of the inerting enclosure 7 is coupled to a lifting device such as a jack 24. Therefore, if a slab 6 strikes, due to its camber, the front wall 7a, it suffices to lift, by means of the jack 24, the upper part of the inerting enclosure 7, by rotating it around the longitudinal axis 23, to allow the slab to pass.
  • the inerting enclosure 7 comprises a plurality of distribution chambers 25 which are constituted by cylindrical boxes open at their lower part and connected to the upper horizontal wall 7b of the inerting enclosure 7, along orifices 26 formed in this wall 7b for the entry of inert gas.
  • Each of the distribution chambers 25 is surmounted by an expansion chamber 27, also cylindrical and of smaller diameter, and which is connected, by line 9, to the source of inert gas 10.
  • this expansion chamber 27 is mounted a horizontal screen 28 forming a baffle.
  • the distribution boxes or chambers 25 are arranged in the upstream part of the inerting enclosure 7, so as to ensure a suitable flow and distribution of the streams of inert gas introduced into the inerting enclosure. These high-flow currents ensure a strong dilution of the quantity of oxygen which is sucked into the inerting enclosure 7, when a slab 6 enters it.
  • the inerting enclosure 7 can also include, below the waiting table 3, inert gas diffusion ramps 29 directing currents of this gas upwards, direction of the waiting table 3 rollers, to dilute in this zone the oxygen which is entrained by the waiting table 3 rollers.
  • the upstream front wall 7a of the inerting enclosure 7 naturally has an opening of sufficient dimensions to allow the passage of the slabs 6. This opening can be closed perm- to avoid the entry of external oxygen, by means of a v '(inert gas) blown across this opening. Cel. also closed by a watertight sliding door 31 ve can be lowered to close the opening of the front wall 7a, as long as a slab 6 must not be introduced into the inerting enclosure 7.
  • FIG. 7 represents a particularly efficient embodiment of the method according to the invention.
  • the slabs B 1 , B 2 , ... are waiting on the carpet T in the enclosure H which is filled with inert gas. This is injected by the chambers H 1 , H 2 and H 3 having respectively a gas injection speed V 1 , V 2 and V 3 and placed successively and respectively at a distance L 1 , L2 and L 3 .
  • the direction of advance of the slabs is indicated by the arrow F 4 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP85401110A 1984-06-07 1985-06-05 Korrosionsschutzverfahren an einem festen Metall, Anwendung beim Walzen Expired EP0170542B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401110T ATE36976T1 (de) 1984-06-07 1985-06-05 Korrosionsschutzverfahren an einem festen metall, anwendung beim walzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8408903A FR2565511B1 (fr) 1984-06-07 1984-06-07 Procede et installation de protection d'un metal solide contre l'oxydation pendant une operation de laminage
FR8408903 1984-06-07

Publications (2)

Publication Number Publication Date
EP0170542A1 true EP0170542A1 (de) 1986-02-05
EP0170542B1 EP0170542B1 (de) 1988-09-07

Family

ID=9304786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401110A Expired EP0170542B1 (de) 1984-06-07 1985-06-05 Korrosionsschutzverfahren an einem festen Metall, Anwendung beim Walzen

Country Status (7)

Country Link
US (1) US4727747A (de)
EP (1) EP0170542B1 (de)
JP (1) JPH08241B2 (de)
AT (1) ATE36976T1 (de)
CA (1) CA1269257A (de)
DE (1) DE3564774D1 (de)
FR (1) FR2565511B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208208A1 (de) * 1992-03-14 1993-09-16 Kloeckner Stahl Gmbh Verfahren und vorrichtung zur verminderung der zunderbildung beim warmumformen von metall, insbesondere von stahl

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS632511U (de) * 1986-06-23 1988-01-09
US5058410A (en) * 1989-03-14 1991-10-22 Boehler Gesellschaft M.B.H. Method and apparatus fo producing thin wire, rod, tube, and profiles, from steels and alloys with low deformability, particularly hardenable steels
FI114900B (fi) * 2000-12-20 2005-01-31 Outokumpu Oy Menetelmä ja laitteisto putkien valmistamiseksi
FI114901B (fi) * 2000-12-20 2005-01-31 Outokumpu Oy Menetelmä ja laitteisto putkien valmistamiseksi valssaamalla
US6675622B2 (en) * 2001-05-01 2004-01-13 Air Products And Chemicals, Inc. Process and roll stand for cold rolling of a metal strip
US20050081588A1 (en) * 2002-11-27 2005-04-21 Richard Twigg Apparatus and method for die inerting
US6898954B2 (en) * 2002-11-27 2005-05-31 Air Liquide American, L.P. Apparatus and method for die inerting
AT504782B1 (de) * 2005-11-09 2008-08-15 Siemens Vai Metals Tech Gmbh Verfahren zur herstellung eines warmgewalzten stahlbandes und kombinierte giess- und walzanlage zur durchführung des verfahrens
CN105665464B (zh) * 2016-04-15 2017-12-08 江苏东方宝泰科技有限公司 一种生产铝复合板用的降温装置
CN109759472B (zh) * 2019-03-01 2020-05-08 佛山市南海忠源铝业有限公司 一种铝合金型材成型工序用冷却运输装置
DE102020201560A1 (de) 2020-02-07 2021-08-12 Thyssenkrupp Steel Europe Ag Verfahren zur Unterdrückung von Zunderbildung auf der Oberfläche eines metallischen Walzgutes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084902A1 (de) * 1982-01-26 1983-08-03 Hoogovens Groep B.V. Verfahren zum Warmwalzen von Stahl wobei der Wärmeverlust des Walzgutes durch ein oder mehrere Hitzeschilder vermindert wird und Vorrichtung zur Durchführung des Verfahrens
DE3208738A1 (de) * 1982-03-11 1983-09-22 kabelmetal electro GmbH, 3000 Hannover Verfahren und vorrichtung zur oberflaechenbehandlung von metallischem gut

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Publication number Priority date Publication date Assignee Title
US2163699A (en) * 1938-04-16 1939-06-27 George F Paul Method and apparatus for rolling hot strip material
US2742691A (en) * 1950-04-18 1956-04-24 Ohio Commw Eng Co Method of making corrosion resistant clad steel
US3257835A (en) * 1964-11-12 1966-06-28 Southwire Co Method of hot forming metal
US3360202A (en) * 1965-09-02 1967-12-26 Inland Steel Co Uniform thin fluid sheet type spray device
US3897230A (en) * 1973-05-09 1975-07-29 Inland Steel Co Cooling system
JPS5343661A (en) * 1976-10-01 1978-04-19 Nippon Steel Corp Hot rolling method
JPS53131258A (en) * 1978-04-28 1978-11-15 Hitachi Ltd Planetary rolling equipment
JPS56119615A (en) * 1980-02-27 1981-09-19 Kawasaki Steel Corp Hot rolling method
JPS57142702A (en) * 1981-02-26 1982-09-03 Nippon Steel Corp Method and device for hot rolling which suppress formation of secondary scale of steel material
JPS5877702A (ja) * 1981-11-04 1983-05-11 Nippon Steel Corp 熱間圧延ステンレス鋼帯の製造方法および装置
JPS5919018A (ja) * 1982-07-22 1984-01-31 Sumitomo Metal Ind Ltd 熱延鋼帯のスケ−ル発生防止方法
JPS5997710A (ja) * 1982-11-29 1984-06-05 Kawasaki Steel Corp 熱延鋼帯の冷却方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084902A1 (de) * 1982-01-26 1983-08-03 Hoogovens Groep B.V. Verfahren zum Warmwalzen von Stahl wobei der Wärmeverlust des Walzgutes durch ein oder mehrere Hitzeschilder vermindert wird und Vorrichtung zur Durchführung des Verfahrens
DE3208738A1 (de) * 1982-03-11 1983-09-22 kabelmetal electro GmbH, 3000 Hannover Verfahren und vorrichtung zur oberflaechenbehandlung von metallischem gut

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, volume 7, no. 173(M-232)(1318) 30 juillet 1983, & JP - A - 58 77 702 (SHIN NIPPON SEITETSU K.K.) 11-05-1983 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208208A1 (de) * 1992-03-14 1993-09-16 Kloeckner Stahl Gmbh Verfahren und vorrichtung zur verminderung der zunderbildung beim warmumformen von metall, insbesondere von stahl

Also Published As

Publication number Publication date
FR2565511A1 (fr) 1985-12-13
FR2565511B1 (fr) 1988-05-13
EP0170542B1 (de) 1988-09-07
US4727747A (en) 1988-03-01
CA1269257A (fr) 1990-05-22
JPH08241B2 (ja) 1996-01-10
JPS613603A (ja) 1986-01-09
ATE36976T1 (de) 1988-09-15
DE3564774D1 (en) 1988-10-13

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