EP0369984B1 - Verfahren und Anlage zum Beizen von Edelstahlbändern - Google Patents

Verfahren und Anlage zum Beizen von Edelstahlbändern Download PDF

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Publication number
EP0369984B1
EP0369984B1 EP89890288A EP89890288A EP0369984B1 EP 0369984 B1 EP0369984 B1 EP 0369984B1 EP 89890288 A EP89890288 A EP 89890288A EP 89890288 A EP89890288 A EP 89890288A EP 0369984 B1 EP0369984 B1 EP 0369984B1
Authority
EP
European Patent Office
Prior art keywords
pickling
strip
roller
installation according
acid
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
EP89890288A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0369984A1 (de
Inventor
Gerald Dr. Maresch
Wilhelm Hofkirchner
Erich Mahr
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.)
Andritz AG
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Publication of EP0369984A1 publication Critical patent/EP0369984A1/de
Application granted granted Critical
Publication of EP0369984B1 publication Critical patent/EP0369984B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/086—Iron or steel solutions containing HF

Definitions

  • the invention relates to a method and a system for pickling steel strips.
  • a steel hot and cold strip is treated in continuous annealing and pickling lines in accordance with the previously common processes.
  • the band is unwound from a decoiler in bundle form and connected to the end of the previous bundle in a welding machine.
  • the strip is removed from a strip store in the unwinding group during the strip standstill.
  • the incoming strip is first annealed in an annealing furnace, cooled with air and water and then the scale is removed in a pickling plant.
  • a wide variety of methods have been established in industry for pickling hot and cold strip, the best-known method being pickling with neutral electrolyte with subsequent mixed acid aftertreatment.
  • a mixture of nitric and hydrofluoric acid is referred to as mixed acid.
  • the tape After rinsing, the tape is dried and rewound. The corresponding welds are cut out, so that a bundle is created in approximately the same length as at the inlet of the system.
  • This process has disadvantages, the main ones being a high investment in plant and labor as well as a large space requirement.
  • the object of the present invention was to develop a method which avoids the disadvantages mentioned at the outset.
  • Another object of the invention was to provide a device for carrying out the method, the risk of damage to the pickling material being reduced as much as possible.
  • the strip coming from the uncoiler with its beginning is pushed at least one pre-descaling system, pickling sections and a flushing system until it has reached a coiler or a cross-cutting unit at the end of the treatment section, whereupon the strip on the Reel clamped and pulled by this alone or in conjunction with other driven treatment rollers through the treatment system or cut into plates by the cross-cutting system, proposed according to the invention that a stainless steel strip is guided through the system as a steel band and at least one with graphite and / or alumina-filled pickling section filled with polyester resin.
  • the belt preferably traverses several pickling sections with different pickling media.
  • the belt can be treated in at least one section with sulfuric acid and in a subsequent section with a mixture of nitric and hydrofluoric acid.
  • the concentration of sulfuric acid is 250-600 g / l, preferably 300-450 g / l.
  • the temperature of this pickling acid can be 60-95 ° C, preferably 70-90 ° C.
  • the concentration of nitric acid can be 100-250 g / l, preferably 100-200 g / l, and that of hydrofluoric acid 10-100 g / l, preferably 20-80 g / l, calculated as the total hydrofluoric acid present.
  • the temperature of the mixed acid can be 30-70 ° C., preferably 40-65 ° C.
  • a system is proposed, using at least one decoiler with belt control, at least one pre-descaling system and a pickling section, a flushing system, a coiler and / or a cross-cutting system as well as driver rollers, driven squeezing rollers and guide rollers, preferably in pairs, the pickling section at least one elongated, preferably flat Pickling tub, which consists of a supporting structure made of steel, glass fiber reinforced plastic or propylene and a lining made of acid and abrasion resistant material, consists of a base layer made of PVC and carbon stones, which according to the invention is characterized in that the top layer of the lining made of graphite and / or aluminum oxide-filled polyester resin.
  • At least two pickling tanks each with at least one pickling section, are provided, a washing brush machine being arranged between the pickling tanks.
  • the system shown in Fig. 1 consists essentially of a decoiler 1, a straightening machine 2, a mechanical pre-descaling system, e.g. a radiator 3, two elongated flat pickling tubs 4 with an interposed washing brush machine 5, a countercurrent rinsing system 7, a dryer 8 and a reel 9 11 provided.
  • a belt control 11 Provided between the dryer 8 and the reel 9 are a belt control 11 'consisting of two guide rollers each opposite one another on one side of the belt 14 to be pickled and subsequently a retraction unit 18 consisting of two rollers lying one above the other.
  • At least one of the pickling tanks 4 consists of at least two successive pickling sections 6, between which the belt 14 is guided between two squeeze rollers 15 (FIG. 2), the upper of which is driven and contributes to the feed of the belt 14.
  • the pickling tub 4 or each of the pickling sections 6 is provided with a cover 16 which can be lifted off in sections and a bottom section 17 which rises on the inlet and outlet sides, which is for the pickling acid present in the tub 4 or in the pickling section 6 forms a weir.
  • the course of these bottom sections 17 is to be understood such that the inlet-side section runs downward in the strip running direction and the outlet-side section runs upwards.
  • the outlet-side section forms a funnel 19 for guiding the beginning of the strip with a corresponding section of the cover 16, which has the tendency to stand up between the squeeze rollers 15.
  • the pickling tub 4 or the pickling section 6 itself is made up of a supporting structure and a lining made of acid and abrasion-resistant material.
  • the load-bearing construction consists of steel with a lining made of chlorinated PVC or glass fiber reinforced plastic or pure plastic, e.g. Polypropylene.
  • There is a layer of coal stones above and the top layer is polyester resin filled with aluminum oxide or graphite.
  • the amount of filler for alumina can be between 10 and 100 percent by weight, but preferably between 20 and 50 percent by weight.
  • the values are between 50 to 400, preferably between 80 to 200, percent by weight.
  • polyester resin matrix and filler results in a material that on the one hand has sufficient resistance to the chemical and mechanical stresses of the pickling company, but which cannot damage the stainless steel strips.
  • the countercurrent rinsing system 7, as shown in FIG. 4, consists of a washing brush machine 5 'and one upstream and one downstream rinsing system 20 or 20'. On the inlet and on the outlet side of each washing system or between washing systems 20 and 20 'and washing brush machine 5 'are arranged, similar to between the pickling sections 6, superimposed squeeze rollers 15, of which at least the upper one is driven.
  • lower and upper spray tubes 21 and 22 are arranged, between which the band 14 to be treated is carried out in the direction of arrow A.
  • the bottom of the washing system 20, 20 ' is formed by plates 23, which are similar or identical to the lining of the pickling tubs 4 and each rise in the direction of movement A of the belt 14.
  • the lower spray pipes 21 are located between the plates 23 and below their upper surface in order to be protected from damage by the band 14, in particular when the beginning of the band is inserted.
  • the lower spray tubes 21 also provide for the formation of a water film between the underside of the belt and the lining material, so that the belt slides on this water film and does not touch the tub bottom, or only slightly. This also helps to avoid mechanical damage, both for the pickling material and for the system itself.
  • a funnel 24 is provided on the output side, similar to the pickling sections 6, which in the present case is formed by a base plate and a cover plate.
  • the washing brush machine 5 'located between the washing systems 20, 20' has two successive rollers one above the other, u. between a backup roller 25 and a brush roller 26, the backup roller 25 being at the bottom and the second roller at the top in the direction of travel of the belt 14 and the bottom roller being offset in relation to the upper roller in the direction of travel of the belt 14.
  • the first is Brush roller can be raised and the second can be lowered.
  • the upper of the two squeeze rollers can also be lifted off.
  • a funnel 27 or 28 or 29 is provided, which corresponds to the funnel 24.
  • a second squeeze roller pair 15 ' is connected downstream of the squeeze roller pair 15' on the outlet side of the second flushing system 20 ', a funnel 30 which corresponds to the funnel 24 being located between the two squeeze roller pairs 15, 15'.
  • the rinse is a countercurrent cascade rinse, in which the rinsing medium is fed from the third cascade into the second cascade, from where it flows into the first cascade, i.e. gets into the washing brush machine 5 '. From this, the rinsing medium of the preceding cascade is fed to the rinsing system 20 and from there to the washing brush machine 5 located between the two pickling tubs 4.
  • the used rinsing or washing medium flows into a collecting container (not shown), from where it is fed back into the rinsing or washing process at most via a preparation system.
  • the washing brush machine 5 located between the pickling tanks 4 corresponds to the previously described washing brush machine 5 ', the same parts being provided with the same reference numerals in FIG. 3.
  • the method according to the invention is carried out in such a way that at the beginning of the treatment of a coil lying on the uncoiler 1, the uncoiler 1 is driven at least until the beginning of the tape has reached the driver 10 and was detected by it.
  • the reel 1 can be adjustable transversely to the direction of the strip through the middle of the strip.
  • the driver 10 advances the belt 14 in the direction of arrow A.
  • the belt control 11 prevents the belt from running sideways.
  • the scissors 12 cut off the beginning of the strip, which, when the strip comes from the rolling mill, is tongue-shaped.
  • the scissors 13 then cut the edges of the beginning of the tape at an angle, so that the beginning of the tape tapers conically to favor the guidance of the tape.
  • the beginning of the band thus takes the form of a trapezoid, it being advantageous if the upper side of the trapezoid or the end of the band has at least half the bandwidth and the angle between the running direction of the band and the trapezoidal side is between 10 and 80, preferably 30 and 60 °.
  • the same pickling medium or different medium can be used in the pickling tanks 4 or the pickling sections 6.
  • the pickling medium is introduced into the pickling tub 4 or into the pickling section 6 on the strip exit side and discharged at the strip entry side so that it flows against the movement of the strip 14.
  • the pickling medium is circulated in the pickling tub or in the pickling section at least once and a maximum of 20 times, preferably 5 to 10 times per hour.
  • the belt 14 After leaving the countercurrent rinsing system 7 and the dryer 8, the belt 14 is directed from the side rollers or rollers of a belt control 11 'to the reel 9, the belt 14 being braked by two rollers of a retraction unit 18 lying one above the other, so that the windings on the reel 9 are sealed be wrapped.
  • a possible cross-cutting system which the pickled finished product in plates cuts, can replace the reel 9.
  • a slitting line which divides the strip into smaller strips, and a grinding system are arranged in front of the reel 9.
  • a device is provided with which the pickling tubs are quickly emptied and flooded with water when the strip stops.
  • pickling ferritic stainless steel strip with mixed acid it can be cooled by means of an externally arranged heat exchanger.
  • the reel can be preceded by a rolling mill in which the strip thickness is reduced.
  • the air or steam can be extracted from them by fans.
  • the lining material can consist of plates which are sawtooth-shaped in the direction of tape travel and are laid with an acid-resistant putty.
  • 27 is the sawtooth-shaped synthetic resin stones in the belt running direction, 28 coal stones underneath and 29 the support structure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
EP89890288A 1988-11-15 1989-11-02 Verfahren und Anlage zum Beizen von Edelstahlbändern Expired - Lifetime EP0369984B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0279988A AT394734B (de) 1988-11-15 1988-11-15 Verfahren und anlage zum beizen von edelstahlbaendern
AT2799/88 1988-11-15

Publications (2)

Publication Number Publication Date
EP0369984A1 EP0369984A1 (de) 1990-05-23
EP0369984B1 true EP0369984B1 (de) 1993-06-02

Family

ID=3540484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89890288A Expired - Lifetime EP0369984B1 (de) 1988-11-15 1989-11-02 Verfahren und Anlage zum Beizen von Edelstahlbändern

Country Status (10)

Country Link
EP (1) EP0369984B1 (ko)
JP (1) JP2926342B2 (ko)
KR (1) KR960002121B1 (ko)
AT (1) AT394734B (ko)
AU (1) AU618850B2 (ko)
BR (1) BR8905794A (ko)
DE (1) DE58904565D1 (ko)
ES (1) ES2048867T3 (ko)
FI (1) FI89511C (ko)
ZA (1) ZA898671B (ko)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404907B (de) * 1993-07-13 1999-03-25 Andritz Patentverwaltung Verfahren und anlage zum herstellen von edelstahlband
US5566694A (en) * 1995-06-07 1996-10-22 Allegheny Plastics, Inc. Continuous pickling tank with expandable seals
AT408765B (de) * 1999-03-05 2002-03-25 Andritz Ag Maschf Anlage zur kontinuierlichen behandlung von stahlbändern
KR100933925B1 (ko) * 2008-06-16 2009-12-28 (주)진양오일씰 수지와 고무의 표면처리를 위한 황산처리장치 및 이를이용한 황산처리방법
JP5679149B2 (ja) * 2010-02-05 2015-03-04 日新製鋼株式会社 ステンレス鋼帯の酸洗操業方法
CN112621389A (zh) * 2020-12-10 2021-04-09 中国重型机械研究院股份公司 一种铝板横切生产装置及其工艺

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1303381C2 (de) * 1974-11-21 Moeller & Neumann Gmbh Kontinuierliche durchlaufbeizanlage fuer endlose baender
DE319766C (de) * 1920-03-16 Electro Metallschweisserei Ges Verfahren und Vorrichtung zur Behandlung von Blechen zwecks Entfernung der Unreinlichkeiten und zur Erzielung einer gleichmaessigen Haerte
DE496147C (de) * 1928-07-25 1930-04-14 Julius Doubs Dipl Ing Verfahren und Vorrichtung zum Beizen und Spuelen von Feinblechen
US2543657A (en) * 1949-06-03 1951-02-27 Hanson Van Winkle Munning Co Scrubbing device with removable brush assembly
US3338208A (en) * 1965-09-07 1967-08-29 Paul U Voss Continuous equipment for pickling and slitting strip steel
DE2029244A1 (en) * 1970-06-13 1971-12-23 Gewerk Keramchemie Pickling plant liquor - vacuum and pressure actuated transfer
SE381289B (sv) * 1973-06-21 1975-12-01 Nyby Bruk Ab Tvastegsbetningsforfarande
DE3149086A1 (de) * 1981-12-11 1983-06-16 Dr. C. Otto & Comp. Gmbh, 4630 Bochum Behaelter zum beizen von baendern
FR2562098B1 (fr) * 1984-03-30 1986-08-14 Clecim Sa Bac de decapage a l'acide de bandes de metal
JPS61199084A (ja) * 1985-02-28 1986-09-03 Nippon Steel Corp Ｃｒ系ステンレス鋼板の製造方法
JPS61266588A (ja) * 1985-05-22 1986-11-26 Nisshin Steel Co Ltd ステンレス鋼の脱スケ−ル方法
DE3605094A1 (de) * 1986-02-18 1987-08-20 Hoesch Ag Beizbehaelter
JPH0421474Y2 (ko) * 1986-07-24 1992-05-15
JPH0410219Y2 (ko) * 1986-12-05 1992-03-13
JPH01501875A (ja) * 1987-02-05 1989-06-29 マシーネンファブリック　アンドリッツ　アクチエンゲゼルシャフト 液体による金属ストリップの表面処理装置及び方法
JPS63266083A (ja) * 1987-04-22 1988-11-02 Nippon Steel Corp 金属ストリツプの表面処理装置

Also Published As

Publication number Publication date
EP0369984A1 (de) 1990-05-23
ZA898671B (en) 1990-08-29
AU4431389A (en) 1990-05-24
KR960002121B1 (ko) 1996-02-10
JPH02185988A (ja) 1990-07-20
BR8905794A (pt) 1990-06-12
AU618850B2 (en) 1992-01-09
ES2048867T3 (es) 1994-04-01
FI89511B (fi) 1993-06-30
AT394734B (de) 1992-06-10
DE58904565D1 (de) 1993-07-08
KR900008064A (ko) 1990-06-02
FI895408A0 (fi) 1989-11-13
JP2926342B2 (ja) 1999-07-28
FI89511C (fi) 1993-10-11
ATA279988A (de) 1991-11-15

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