EP0046423A1 - Walzverfahren zum geregelten Nachwalzen von im Einsatzofen weichgeglühtem Stahlband - Google Patents

Walzverfahren zum geregelten Nachwalzen von im Einsatzofen weichgeglühtem Stahlband Download PDF

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Publication number
EP0046423A1
EP0046423A1 EP81401230A EP81401230A EP0046423A1 EP 0046423 A1 EP0046423 A1 EP 0046423A1 EP 81401230 A EP81401230 A EP 81401230A EP 81401230 A EP81401230 A EP 81401230A EP 0046423 A1 EP0046423 A1 EP 0046423A1
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EP
European Patent Office
Prior art keywords
rolling
strip
elongation
cage
strips
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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
EP81401230A
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English (en)
French (fr)
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EP0046423B2 (de
EP0046423B1 (de
Inventor
Pierre Gombaud
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FORGES DE BASSE-INDRE Ste
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FORGES DE BASSE-INDRE Ste
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Application filed by FORGES DE BASSE-INDRE Ste filed Critical FORGES DE BASSE-INDRE Ste
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Application granted granted Critical
Publication of EP0046423B1 publication Critical patent/EP0046423B1/de
Publication of EP0046423B2 publication Critical patent/EP0046423B2/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same

Definitions

  • the invention relates to a method of work hardening by rolling strips of mild steel intended in particular for the manufacture of packaging, this work hardening taking its place in the manufacture of strips, where sheets in coils from steel grade intended for continuous casting are brought to substantially strip thickness by a first cold rolling, annealed so as to remove the structural anisotropies generated by the first rolling, then hardened by a second rolling so as to bring the strip metal to hardness chosen. More specifically, the method is intended to give strips annealed in a bellows a hardness comparable to that of strips annealed continuously and work-hardened by dry rolling with an elongation of less than 2%.
  • the invention takes its place in the technological development of the production of steel strips intended mainly for the manufacture of packaging; in the form of tin and black iron, that is to say cold-rolled strips of nominal thicknesses ranging from 0.15 to -0.49 mm, conforming to standard ISO 1111 / II (1976).
  • tinplate is meant bands or sheets covered with tin, and by black iron corresponding bands not tinned, either at the stage preceding tinning, or intended for the manufacture of articles protected by various surface treatments.
  • the invention relates to the production of strips in the state of black iron, at a stage preceding the tinning of white iron or any other surface treatment.
  • the strips are produced from coils of sheets of the order of 2 mm, which undergo a first cold rolling, during which the sheets are reduced in thickness with a corresponding elongation, to give strips. whose thickness is substantially the final thickness of the black iron strip.
  • the strips are then annealed under a protective atmosphere, to remove the structural anisotropies caused by the first rolling, where the metal has undergone considerable elongation giving it a fibrous crystalline structure.
  • the metal is too soft for processing by deformation. It is therefore subjected to a second rolling at low elongation, to work harden and give it the hardness required for subsequent shaping. This second rolling, hardening, also perfects the finish of the strips.
  • the sheets themselves were produced by hot rolling of slabs.
  • slabs were obtained from steel cast in molds.
  • the annealing of the strips after the first cold rolling was carried out in a closed coil.
  • the grades of steel used were such that the second rolling, hardening, gave the strips a suitable hardness with an elongation of approximately 1 to 2%.
  • continuous annealing techniques have been developed, where the strip, after having undergone a first rolling, passes through an annealing furnace, before re-reeling for the second hardening rolling. This continuous annealing is carried out much faster than conventional annealing in a closed coil, and in particular comprises brief heating and cooling phases.
  • the crystalline structure of the steel after continuous annealing is much finer than after annealing under a hood, with a consequence a higher hardness, which obviously has an impact on the hardness of the strip after hardening rolling. Consequently, the grades of continuous casting steels of the coil sheets intended for the production of black iron strips have been modified by reduction of the content of hardening elements, in order to obtain suitable hardnesses of the black irons in strip produced according to the continuous casting processes of steels, and the continuous annealing of strips after the first rolling. It will be noted that the use of milder grades of steel has an obvious advantage for cold rolling, by reducing the energy required to obtain the desired thickness reduction.
  • the main objective of the invention is a method of work hardening of strips coming from steel of grade intended for continuous casting, and annealed in a bell, which gives them a hardness comparable to that of corresponding strips annealed continuously.
  • the object of the invention is also a method of strip hardening which is applicable to conventional rolling mill trains without major transformations.
  • the invention proposes, in the manufacture of strips of mild steel intended in particular for the manufacture of packaging, where coil sheets coming from steel of grade intended for continuous casting are brought substantially to strip thickness by a first cold rolling, annealed so as to remove the structural anisotropies generated by the first rolling, then hardened by a second rolling with low elongation so as to bring the strip metal to a selected hardness, a hardening rolling process intended to give tapes annealed in a bellows a hardness comparable to that of tapes continuously annealed and cold worked by dry rolling with an elongation of less than 2%, characterized in that it is led on two successive cages, so that the resulting elongation is set to a value chosen between 4 and 20% and obtained for the most part in the first cage, the strip is lubricated at the entry of the first cage by projection of an em ulsion of oil in water, the strip is washed with water at a temperature above room temperature between the cages, and the strip is dried by blowing
  • the Applicant has found that it is possible to adjust the rate of work hardening of the strips after annealing under a bell, by correlatively adjusting the rate of elongation when passing through work hardening cages, the final hardness of the strip increasing with the elongation rate, and this final hardness can be reproducibly adjusted with good precision provided that the elongation rate is closely controlled within a range of 4 to 20%.
  • the roughness of the first cage cylinders is between 3.5 and 1 micrometers Ra, while that of the second cage cylinders is between 0.75 and 0.4 micrometers Ra.
  • These roughnesses which correspond to a a relatively rough surface condition for the first cage, and a finely rectified condition for the second cage, have proved useful so that the elongation is mainly obtained in the first cage, with effective control of the total elongation.
  • the elongation at the passage of the first cage represents 85 to 95% of the total elongation at work hardening.
  • the oil in water emulsion used for lubrication is at a content of between 1 and 10% of oil.
  • the washing water between the cages is at around 50 ° C., which corresponds to a good compromise between the requirements for evaporation rate and the absence of prematurely dried zones.
  • washing water will preferably contain approximately 0.2% by weight of sodium nitrite, to passivate the surface of the strip and avoid subsequent oxidation.
  • the rolling mill has two successive stands 11 and 12, the first and second stands in the direction of travel of the strip 10 indicated by the arrow 10a.
  • These cages respectively comprise upper cylinders 11a and 12a and lower cylinders 11b and 12b.
  • the strip 10 to be hardened is cut from a coil 1, which has been previously annealed in a protective atmosphere under a conventional bell.
  • the strip 10 passes over a pair of tensioning rollers 2; braked to energize the tape. Leaving the tension rollers 2, the strip engages between the cylinders 11a and 11b of the first cage 11, then between the cylinders 12a and 12b of the cage 12, before passing between a pair of tension rollers 4, then s 'winding on a take-up reel 5.
  • the torques exerted on the axes of the tension rollers 2 and 4 are adjusted by servo-control to give the strip a regulated tension, and the speeds and driving torques of the rolls of cages 11 and 12 are adjustable in cooperation with the tightening of the cages to adjust the elongations.
  • the cylinders 11a and 11b are rectified with a roughness of 3 micrometers Ra, while the cylinders 12a and 12b are rectified polished with a roughness of 0.6 micrometers Ra.
  • the roughness Ra is the quadratic mean of the deviations from the real surface to the theoretical surface.
  • the rolling mill was equipped with spraying booms 6 at the entrance to the cage 11, and 7 in the vicinity of the outlet from this cage 11, and with blowing booms 8 at the exit from the cage 12.
  • the booms 6 are supplied at a pressure adjustable from 2 to 5 bars, with water added with approximately 5% of oil, in this case a synthetic oil sold under the name FCF 106 by the company CRODA.
  • the flow rate of the ramps is regulated by the supply pressure, to provide, in order of magnitude, 250 g of oil for 1,000 m 2 of exposed strip surface (that is to say, counting the two sides).
  • the ramps 7 are supplied with water at the temperature of 50 ° C approximately, at a rate of approximately 0.2 to 0.4 m of water per 1 . 000 m 2 of exposed strip surface. 5 kg of sodium nitrite are added to the water per cubic meter. Of course, the water which flows from the strip after washing is taken up and treated to be recycled.
  • the blowing by the ramps 8 is carried out with compressed air, and adjusted so that beyond the strip is wet, but not wet.
  • the film of water which remains on the surface beyond the blowing ramps 8 gradually evaporates to disappear before being wound up on the take-up reel 5.
  • the traction on the strip 10 between the tensioning rollers 2 and 4, the peripheral speeds of the cage cylinders 11 and 12, and the tightening of the cages are adjusted, according to the rules of the art, so that the elongation has a chosen value , and that approximately 90% of this elongation occurs in the first cage 11.
  • the cage 12 essentially has the role of leveling and improving the finish of the strip 10, of regulating the traction on the strip (between 20 and 40 kN normally) on the side of the cage 11, and incidentally wring the strip.
  • the parameter values indicated above are average values, determined by the Applicant during numerous tests. However, the most important parameter, to which the other parameters are subordinate, is the elongation imparted to the strip, depending on the state of the strip after annealing in a hood and the desired final hardness.
  • Figure 2 shows the hardness, expressed in Rockwell HR 30T of the work hardened strips, as a function of the elongation imparted.
  • the shade band A goes from 61 Rockwell HR 30T for 4% elongation to 69 HR 30T for 20% elongation, and the shade band B goes from 64 to 71 HR 30T for these limited elongations
  • the shade band A will be hardened with an elongation of approximately 13%, and the shade band B with an elongation of approximately 7%.
  • the lubricating power of the oil emulsion has an effect on the elongation. It is indicated to use an oil with a rather reduced intrinsic lubricating power, but with a relatively high content in the emulsion, which makes it easier to control the oil content of the emulsion and therefore the regularity of the lubricating power of the emulsion. 'emulsion.
  • the transition connection has large radii of curvature for bell-annealed and conventionally hardened steels, a bearing or elbow with very small radius of curvature for continuously annealed and conventionally hardened steels, and an elbow with small radius of curvature for steels annealed in a bell and work hardened according to the process of the invention.
  • a stress difference of the order of 50 N / mm2 between the conventional processes is recorded, while the hardened steels according to the invention exhibit, by compared to steels continuously annealed, a stress difference of less than 10 N / mm 2 .
  • the invention is not limited to the examples described, but embraces all the variant embodiments thereof within the precise framework of the problem that the Applicant seeks to solve. It is understood in particular that the work hardening can be carried out on a rolling mill comprising more than two cages, using only two operating cages. We also could implement the process with two rolling mills with one cage, respecting the operating conditions specific to each cage according to the teachings presented above, although the use of a rolling mill with at least two cages is preferred

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP81401230A 1980-08-18 1981-07-30 Walzverfahren zum geregelten Nachwalzen von im Einsatzofen weichgeglühtem Stahlband Expired - Lifetime EP0046423B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8018054 1980-08-18
FR8018054A FR2488532A1 (fr) 1980-08-18 1980-08-18 Procede de laminage ecrouissant a taux regle pour bandes d'acier doux recuites sous cloche

Publications (3)

Publication Number Publication Date
EP0046423A1 true EP0046423A1 (de) 1982-02-24
EP0046423B1 EP0046423B1 (de) 1984-10-10
EP0046423B2 EP0046423B2 (de) 1990-12-19

Family

ID=9245236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401230A Expired - Lifetime EP0046423B2 (de) 1980-08-18 1981-07-30 Walzverfahren zum geregelten Nachwalzen von im Einsatzofen weichgeglühtem Stahlband

Country Status (7)

Country Link
EP (1) EP0046423B2 (de)
DE (2) DE46423T1 (de)
ES (1) ES504786A0 (de)
FR (1) FR2488532A1 (de)
GR (1) GR75311B (de)
NO (1) NO152676C (de)
PT (1) PT73532B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0391658A1 (de) * 1989-04-07 1990-10-10 Kawasaki Steel Corporation Nass-Kaltwalzverfahren
EP0436762A1 (de) * 1990-01-12 1991-07-17 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Verfahren und Anlage zum Erzeugen einer vorgegebenen Streckgrenzen-Festigkeit und Oberflächenrauhigkeit im Zuge des Kaltnachwalzens vorbehandelter Metallbänder
ES2043530A1 (es) * 1992-01-30 1993-12-16 Kramer Antonio Henriqu Procedimiento de fabricacion de recipientes metalicos.
EP0679451A1 (de) * 1994-04-27 1995-11-02 Hoogovens Staal B.V. Vorrichtung und Verfahren zur Herstellung von zweimal gewaltzem Stahlband
EP0723824A1 (de) * 1995-01-24 1996-07-31 Inland Steel Company Verfahren zum Einölen von Stahlband für Kaltwalzen, insbesondere für Nachwalzen
EP1013351A2 (de) * 1998-12-25 2000-06-28 Kawasaki Steel Corporation Kaltnachwalzverfahren für Stahlblech und Kaltnachwalzwerk
CN117753782A (zh) * 2024-02-21 2024-03-26 山西广华源药用包装有限公司 一种铝箔加工的压延成型机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2935469T3 (es) * 2018-11-23 2023-03-07 John Cockerill S A Laminador en frío flexible y método para convertir el mismo

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR629623A (fr) * 1926-11-05 1927-11-14 Kalker Maschinenfabrik Ag Procédé de laminage à froid du fer, de l'acier et d'autres métaux
US1860613A (en) * 1929-08-22 1932-05-31 Republic Steel Corp Method of rolling metal sheets
DE1546173A1 (de) * 1965-03-19 1969-04-17 C Otto & Company Gmbh Dr Verfahren zur Nachbehandlung von gebeiztem strangfoermigem Material,vorzugsweise Breitband
FR2097751A5 (de) * 1970-04-15 1972-03-03 Nyby Bruk Ab
FR2223095A1 (de) * 1973-03-23 1974-10-25 Westinghouse Electric Corp
DE2362051A1 (de) * 1973-12-13 1975-06-19 Hufnagl Walter Verfahren zum herstellen von bewehrungsstaehlen (bewehrungsstaeben)

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR629623A (fr) * 1926-11-05 1927-11-14 Kalker Maschinenfabrik Ag Procédé de laminage à froid du fer, de l'acier et d'autres métaux
US1860613A (en) * 1929-08-22 1932-05-31 Republic Steel Corp Method of rolling metal sheets
DE1546173A1 (de) * 1965-03-19 1969-04-17 C Otto & Company Gmbh Dr Verfahren zur Nachbehandlung von gebeiztem strangfoermigem Material,vorzugsweise Breitband
FR2097751A5 (de) * 1970-04-15 1972-03-03 Nyby Bruk Ab
FR2223095A1 (de) * 1973-03-23 1974-10-25 Westinghouse Electric Corp
DE2362051A1 (de) * 1973-12-13 1975-06-19 Hufnagl Walter Verfahren zum herstellen von bewehrungsstaehlen (bewehrungsstaeben)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WILLIAM L. ROBERTS: Cold Rolling of Steel, 1978, Marcel Dekker Inc. pages 240 et 241 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0391658A1 (de) * 1989-04-07 1990-10-10 Kawasaki Steel Corporation Nass-Kaltwalzverfahren
EP0436762A1 (de) * 1990-01-12 1991-07-17 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Verfahren und Anlage zum Erzeugen einer vorgegebenen Streckgrenzen-Festigkeit und Oberflächenrauhigkeit im Zuge des Kaltnachwalzens vorbehandelter Metallbänder
ES2043530A1 (es) * 1992-01-30 1993-12-16 Kramer Antonio Henriqu Procedimiento de fabricacion de recipientes metalicos.
EP0679451A1 (de) * 1994-04-27 1995-11-02 Hoogovens Staal B.V. Vorrichtung und Verfahren zur Herstellung von zweimal gewaltzem Stahlband
NL9400674A (nl) * 1994-04-27 1995-12-01 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van DKG bandstaal.
US5693287A (en) * 1994-04-27 1997-12-02 Hoogovens Staal Bv Apparatus and method for the manufacture of DR steel strip
EP0723824A1 (de) * 1995-01-24 1996-07-31 Inland Steel Company Verfahren zum Einölen von Stahlband für Kaltwalzen, insbesondere für Nachwalzen
EP1013351A2 (de) * 1998-12-25 2000-06-28 Kawasaki Steel Corporation Kaltnachwalzverfahren für Stahlblech und Kaltnachwalzwerk
EP1013351A3 (de) * 1998-12-25 2002-11-27 Kawasaki Steel Corporation Kaltnachwalzverfahren für Stahlblech und Kaltnachwalzwerk
CN117753782A (zh) * 2024-02-21 2024-03-26 山西广华源药用包装有限公司 一种铝箔加工的压延成型机
CN117753782B (zh) * 2024-02-21 2024-05-03 山西广华源药用包装有限公司 一种铝箔加工的压延成型机

Also Published As

Publication number Publication date
ES8205589A1 (es) 1982-06-16
DE3166614D1 (en) 1984-11-15
FR2488532B1 (de) 1982-11-05
GR75311B (de) 1984-07-13
NO812771L (no) 1982-02-19
FR2488532A1 (fr) 1982-02-19
NO152676C (no) 1985-11-06
EP0046423B2 (de) 1990-12-19
EP0046423B1 (de) 1984-10-10
ES504786A0 (es) 1982-06-16
DE46423T1 (de) 1983-03-17
PT73532A (fr) 1981-09-01
PT73532B (fr) 1983-08-24
NO152676B (no) 1985-07-29

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