EP0046423B2 - Procédé de laminage écrouissant à taux réglé pour bandes d'aciers doux recuites sous cloches - Google Patents

Procédé de laminage écrouissant à taux réglé pour bandes d'aciers doux recuites sous cloches Download PDF

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Publication number
EP0046423B2
EP0046423B2 EP81401230A EP81401230A EP0046423B2 EP 0046423 B2 EP0046423 B2 EP 0046423B2 EP 81401230 A EP81401230 A EP 81401230A EP 81401230 A EP81401230 A EP 81401230A EP 0046423 B2 EP0046423 B2 EP 0046423B2
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EP
European Patent Office
Prior art keywords
rolling
strip
strips
elongation
annealed
Prior art date
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Expired - Lifetime
Application number
EP81401230A
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German (de)
English (en)
French (fr)
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EP0046423A1 (fr
EP0046423B1 (fr
Inventor
Pierre Gombaud
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FORGES DE BASSE-INDRE Ste
Original Assignee
FORGES DE BASSE-INDRE Ste
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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 of grades 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 so as to bring the strip metal at selected hardness. 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 strips laminated to cold with nominal thicknesses ranging from 0.15 to 0.49 mm, in accordance with ISO 1111/11 (1976).
  • tinplate is meant strips or sheets covered with tin, and by black iron corresponding strips not tinned, either at the stage before tinning, or intended for the manufacture of articles protected by various surface treatments.
  • the invention relates to the development 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 strip of black iron.
  • 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 with 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 the conventional annealing in a coil under chloche, and notably includes brief heating and cooling phases.
  • the crystalline structure of the steel after continuous annealing is much finer than after annealing in a bell, with as a consequence a higher hardness, which obviously affects 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 the 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 provides an increasing rolling process for the production of strips mild steel intended in particular for the manufacture of packaging, where the coil sheets are brought to substantially strip thickness by a first cold rolling, annealed so as to remove the structural anisotropies generated by the first rolling, hardened by a second rolling with low elongation so as to bring the strip material to selected hardness, this second rolling being carried out with lubrication by spraying an oil-in-water emulsion onto the strip at the entrance to the rolling mill , characterized in that it is intended to impart to strips, coming from steel of continuous casting, and annealed under bell, a hardness comparable to that of continuously annealed strips worked hard by dry rolling with an elongation of less than 2% , process in which the steel strips, which were of quality normally intended to be continuously annealed, and nevertheless were annealed, are run on two bands successive cages so that the resulting elongation is equal to a value chosen between 4 and 20% and obtained for 85-95% in the first cage, at the entrance
  • the aim is essentially an improvement in the finishing of the strips, by reducing the adhesion of residual deposits after annealing in order to avoid superficial encrustation of the residues on the strip, and by reducing the fouling of the rolling mill rolls.
  • lubrication increases the elongation of the strip during work hardening, in particular at high running speeds, while the hardness of the work hardened strip decreases somewhat at equal elongation.
  • the elongations in wet work hardening must not exceed 3%. The opinion of those skilled in the art is that this wet hardening is only of interest for cleaning dirty cylinders.
  • 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 major part obtained in the first cage, with an effective control of the total elongation relatively rough surface state for the first cage, and a finely rectified state for the second cage, have proved useful for that the elongation is mainly obtained in the first cage, with effective control of the total elongation.
  • elongations of 4 to 20% correspond to thickness reductions respectively of 3.8 to 16.7%, that is to say variations in thickness, for a strip of 0.2 mm thickness respectively from 7.6 to 33.4 micrometers.
  • the only control of thickness, as it is practiced for the reduction of thickness, would be inoperative to regulate the hardness of the strip at the output of work hardening in the required game.
  • the classic work hardening with elongations of less than 2% is located in an area where the final hardness depends little on the elongation, which therefore does not require tight control.
  • 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 tension rollers 2, braked to put the strip under tension.
  • the strip engages between the cylinders 11a a and 11b b 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, pous to be wound 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 cages 11 and 12 are adjustable in cooperation with the tightening of the cages to adjust the elongations.
  • the cylinders 11a and 11b are preferably ground with a roughness of 3 micrometers Ra, while the cylinders 12a and 12b are ground 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, in order to provide, in order of magnitude, 250 g of oil per 1000 m 2 of exposed strip surface (that is to say, counting the two sides).
  • the ramps 7 are supplied with water at a temperature of approximately 50 ° C., at a rate of approximately 0.2 to 0.4 m 3 of eua per 1000 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 deeua 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 limit elongations.
  • the roughness of the first cage cylinders should be all the higher as the elongation chosen is low, a roughness Ra of 3.5 micrometers suitable for elongations of 4%, while for elongations of 20%, a roughness of 1 micrometer Ra was suitable.
  • the lubricating power of the oil emulsion has an effect on the elongation. It is advisable 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 steels annealed under chloche and conventionally hardened, a bearing or an elbow with very small radius of curvature for steels annealed continuously and hardened conventionally, and an elbow with small radius of curvature for steels annealed under chloche and work-hardened according to the process of the invention.
  • a stress difference of the order of 50 N / m M2 is recorded between the conventional processes, while the work hardened steels according to the invention have, compared to steels continuously annealed, a stress difference of less than 10 N / mm 2.
  • the invention is not limited to the examples described. 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. Furthermore, the method could be implemented with two rolling mills with a cage, respecting the operating conditions specific to each according to the teachings presented above, although the use of a rolling mill with at least two stands is preferred.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP81401230A 1980-08-18 1981-07-30 Procédé de laminage écrouissant à taux réglé pour bandes d'aciers doux recuites sous cloches Expired - Lifetime EP0046423B2 (fr)

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 EP0046423A1 (fr) 1982-02-24
EP0046423B1 EP0046423B1 (fr) 1984-10-10
EP0046423B2 true EP0046423B2 (fr) 1990-12-19

Family

ID=9245236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401230A Expired - Lifetime EP0046423B2 (fr) 1980-08-18 1981-07-30 Procédé de laminage écrouissant à taux réglé pour bandes d'aciers doux recuites sous cloches

Country Status (7)

Country Link
EP (1) EP0046423B2 (ja)
DE (2) DE46423T1 (ja)
ES (1) ES8205589A1 (ja)
FR (1) FR2488532A1 (ja)
GR (1) GR75311B (ja)
NO (1) NO152676C (ja)
PT (1) PT73532B (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054302A (en) * 1989-04-07 1991-10-08 Kawasaki Steel Corporation Hardness compensated thickness control method for wet skin-pass rolled sheet
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
ES2043530B1 (es) * 1992-01-30 1994-06-16 Kramer Antonio Henriqu Procedimiento de fabricacion de recipientes metalicos.
NL9400674A (nl) * 1994-04-27 1995-12-01 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van DKG bandstaal.
US5555756A (en) * 1995-01-24 1996-09-17 Inland Steel Company Method of lubricating steel strip for cold rolling, particularly temper rolling
JP3783439B2 (ja) * 1998-12-25 2006-06-07 Ｊｆｅスチール株式会社 鋼板の調質圧延方法
CN112969540B (zh) * 2018-11-23 2023-11-03 考克利尔维修工程有限责任公司 灵活冷轧机及其转换方法
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

Family Cites Families (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
SE338221B (ja) * 1970-04-15 1971-08-30 Nyby Bruk Ab
US3820365A (en) * 1973-03-23 1974-06-28 Westinghouse Electric Corp Automatic extension control
DE2362051A1 (de) * 1973-12-13 1975-06-19 Hufnagl Walter Verfahren zum herstellen von bewehrungsstaehlen (bewehrungsstaeben)

Also Published As

Publication number Publication date
PT73532B (fr) 1983-08-24
EP0046423A1 (fr) 1982-02-24
NO812771L (no) 1982-02-19
PT73532A (fr) 1981-09-01
NO152676C (no) 1985-11-06
ES504786A0 (es) 1982-06-16
GR75311B (ja) 1984-07-13
EP0046423B1 (fr) 1984-10-10
FR2488532B1 (ja) 1982-11-05
DE46423T1 (de) 1983-03-17
DE3166614D1 (en) 1984-11-15
ES8205589A1 (es) 1982-06-16
FR2488532A1 (fr) 1982-02-19
NO152676B (no) 1985-07-29

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