EP1013351B1 - Procédé d'écrouissage à froid pour tôles d'acier et laminoir d'écrouissage - Google Patents

Procédé d'écrouissage à froid pour tôles d'acier et laminoir d'écrouissage Download PDF

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Publication number
EP1013351B1
EP1013351B1 EP99310136A EP99310136A EP1013351B1 EP 1013351 B1 EP1013351 B1 EP 1013351B1 EP 99310136 A EP99310136 A EP 99310136A EP 99310136 A EP99310136 A EP 99310136A EP 1013351 B1 EP1013351 B1 EP 1013351B1
Authority
EP
European Patent Office
Prior art keywords
roll
temper rolling
surface roughness
steel plate
stand
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 - Fee Related
Application number
EP99310136A
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German (de)
English (en)
Other versions
EP1013351A2 (fr
EP1013351A3 (fr
Inventor
Teruhiro C/O Chiba Works Saito
Hidenori c/o Chiba Works Miyake
Goro c/o Chiba Works Kawaguchi
Naoya c/o Chiba Works Sato
Makoto C/O Chiba Works Kobayashi
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.)
JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP1013351A2 publication Critical patent/EP1013351A2/fr
Publication of EP1013351A3 publication Critical patent/EP1013351A3/fr
Application granted granted Critical
Publication of EP1013351B1 publication Critical patent/EP1013351B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills

Definitions

  • the present invention relates to a temper rolling method for steel plate and a to temper rolling mill according to the preambles of claim 1 and claim 6 respectively (see e.g. FR-A 00 46 423).
  • the present invention especially relates to a temper rolling method for a steel plate suitable for producing a can having a highly bright appearance, and to a temper rolling mill for carrying out the method.
  • Temper rolling of a steel plate requiring brightness before or after plating is usually effected by a dry rolling method using a rolling mill with two stands or more, each stand being allotted a different role.
  • the first stand mainly serves for adjusting the quality of the material (surface hardness and the like) and requires a dull roll having a strong grip force in order to ensure sufficient elongation.
  • This dull roll is usually a roll that has been marked by dull stripes with weakly directional (or generally strongly random) surface roughness produced by shot blasting, electro-spark machining or laser processing.
  • the surface roughness (Ra) is usually 0.5 ⁇ m or more.
  • a grinding processing roll comprises a so-called mirror bright roll for forming a specular surface appearance, and a so-called scratch bright roll for leaving grinding traces (with a surface roughness (Ra) of about 0.15 ⁇ m or more) behind. Some of the scratch bright rolls leave a surface roughness (Ra) of 0.5 ⁇ m or more. However, the scratch bright roll is not used in the first stand, since it has been considered to be insufficient for ensuring sufficient elongation.
  • the steel plate is rolled with the scratch bright roll in the second stand of the rolling mill and thereafter for improving the brightness by alleviating the effect of the dull stripes formed in the preceding stand.
  • the steel plate is then rolled with the scratch bright roll, a mirror bright roll or a dull roll having a surface roughness corresponding to the required surface roughness of the steel plate.
  • a two stand operation is most advantageous with respect to the production cost.
  • a dull roll such as a shot blasted dull roll is used for the front stand and a bright roll is used for the final stand.
  • the present invention provides a temper rolling method for temper rolling a steel plate using a temper rolling mill provided with a plurality of roll stands, wherein at least the roll at the top front stand is a scratch bright roll having a surface roughness (Ra) of 1.2 ⁇ m or less, and at least the roll at the last stand is a bright roll having a surface roughness (Ra) of 0.5 ⁇ m or less, and wherein the temper rolling is dry rolling and the steel plate contains 0.012 wt% or less of carbon (C).
  • a temper rolling method for temper rolling a steel plate using a temper rolling mill provided with a plurality of roll stands wherein at least the roll at the top front stand is a scratch bright roll having a surface roughness (Ra) of 1.2 ⁇ m or less, and at least the roll at the last stand is a bright roll having a surface roughness (Ra) of 0.5 ⁇ m or less, and wherein the temper rolling is dry rolling and the steel plate contains 0.012 wt% or less of carbon (C
  • the temper rolling mill used in the method has two stands in which case the roll at the first stand is the scratch bright roll having a surface roughness (Ra) of 1.2 ⁇ m or less, and the roll at the second stand is the bright roll having a surface roughness (Ra) of 0.5 ⁇ m or less.
  • the present invention provides a temper rolling mill for rolling a steel plate having a plurality of stands, wherein at least the roll at the top front stand is a scratch bright roll having a surface roughness (Ra) of 1.2 ⁇ m or less, and wherein at least the roll at the last stand is a bright roll having a surface roughness (Ra) of between 0.15 and 0.3 ⁇ m.
  • the temper rolling mill is provided with two stands in which case the roll at the first stand is the scratch bright roll having a surface roughness (Ra) of 1.2 ⁇ m or less, and the roll at the second stand is the bright roll having a surface roughness (Ra) of between 0.15 and 0.3 ⁇ m.
  • Brightness, especially brightness after plating, of the steel plate is markedly improved when the steel plate is rolled using a scratch bright roll, even if the surface roughness is comparable to that obtained by other rolling methods. It is conjectured that, since the scratch bright roll leaves unidirectional grinding traces, only a few concave portions called dull bits, which are considered to be a main cause of deterioration of brightness, are formed.
  • the extremely low carbon steel is often excessively elongated when rolled with a dull roll at the top front stand resulting in excess hardness. Or, the elongation may be out of the control limit even though the hardness is not in excess, thereby requiring a quality test to be carried out prior to shipping. On the contrary, when a scratch bright roll is used in place of the dull roll, such excess elongation can be avoided.
  • the steel plates to be subjected to the temper rolling method according to the present invention are limited to those containing 0.012 wt% or less of carbon (C), because a desired hardness cannot be attained by elongation using the scratch bright roll at the top front stand when the steel plate contains more than 0.012% of C. More preferably, the steel plate contains 0.0080 wt% or less of carbon.
  • the preferred lower limit for the carbon content is 0.0010 wt%, as lower contents may cause excess elongation.
  • FIG. 1 shows a graph indicating the relationship between the C content and the elongation of temper rolled steel plate as a result of studies made by the inventors of the present invention.
  • Scratch bright rolls with a surface roughness (Ra) of 0.6 ⁇ m, scratch bright rolls with a surface roughness (Ra) of 0.15 ⁇ m, and shot blasted dull rolls with a surface roughness (Ra) of 0.6 ⁇ m were used as the first stand for obtaining the curves denoted by SB 0.6, SB 0.15 and SB 0.6, respectively, in FIG. 1.
  • Each temper rolling mill comprised two stands, and a scratch bright roll with a surface roughness of 0.2 ⁇ m was used at the second stand. An elongation of 1.6% ⁇ 0.2% was obtained with respect to the steel plate containing 0.002 wt% of C under the rolling condition used.
  • the steel plate preferably contains either 0.02 wt% of titanium (Ti) or 0.1 wt% of niobium (Nb), or both of them, in order to ensure softness and machinability. Lower limits of 0.005 wt% and 0.002 wt% are recommended with respect to Ti and Nb.
  • Aluminum (Al) may be present in an amount of 0.15 wt% or less for deoxidation and stabilization of nitrogen (N).
  • Si silicon
  • Mn manganese
  • P phosphorous
  • S sulfur
  • More preferable contents of Si, P and S are 0.05 wt% or less, 0.02 wt% or less and 0.02 wt% or less, respectively.
  • Calcium (Ca) may be added if desired and the balance is Fe and incidental element and impurities.
  • the top roll is a scratch bright roll with a surface roughness (Ra) of 1.2 ⁇ m or less. Brightness before or after plating becomes poor when a dull roll or a scratch bright roll with a surface roughness (Ra) of more than 1.2 ⁇ m is used.
  • the preferred lower limit of the surface roughness (Ra) is 0.20 ⁇ m or more. When the surface roughness (Ra) is less than 0.20 ⁇ m, elongation (hardness) tends to be insufficiently developed.
  • the more preferable surface roughness (Ra) is in the range of 0.5 to 1.0 ⁇ m.
  • chromium (Cr) plating may be effected in view of wear resistance.
  • At least the roll at the last stand should be a bright roll with a surface roughness (Ra) of 0.5 ⁇ m or less for ensuring a given level or more of brightness.
  • a mirror bright roll or a scratch bright roll may be used depending on the target surface roughness.
  • a desired brightness including after plating
  • the surface roughness is preferably lower than the surface roughness of the roll at the final stand.
  • the effect of the present invention is markedly exhibited using a roll with a surface roughness (Ra) range of about 0.15 to 0.3 ⁇ m which is used according to the apparatus of the present invention, where requirements for brightness have not been satisfied using a conventional roll.
  • plating with Cr may be applied to the surface to improve wear resistance.
  • Bright rolls are preferably used for the rolls of the stands intermediate the top front and last stands.
  • a roll having a surface roughness within the range of the surface roughness of the front and last stands is especially suitable for the rolls to be used in the stands other than the front and last stands for ensuring a required brightness. More preferably, the surface roughness of each roll is gradually made finer in the order of from the front roll to the succeeding rolls.
  • a dry rolling that requires no lubrication of the steel plate is used for the temper rolling.
  • An elongation of 3% or less is suitable, while an elongation of 1.5 ⁇ 1% is more preferable and an elongation of 1.5 ⁇ 0.5% is further preferable.
  • the target hardness may be 50 to 60 in HR30T.
  • Plating methods after the temper rolling are not especially designated.
  • Various plating methods generally used for plating steel plates for cans such as tin plating or chromium plating, or nickel (Ni) plating or a chromate processing on the surfaces after these plating treatments may be applied to the target steel plate according to the present invention.
  • Brightness was measured at an incident light angle of 20° using a gloss meter following JIS Z8741 in the present invention.
  • the temper rolling mill according to the present invention may be applied to a production line using the temper rolling alone, or it may installed at the outlet of a continuous annealing furnace.
  • the steel plate After subjecting the cold roll steel plate having each component shown in TABLE 1 to recrystallization annealing (continuous annealing), the steel plate was temper rolled with a temper rolling mill having two to three sands under the conditions shown in TABLE 2, and the conditions other than those shown in TABLE 2 are the same condition under which an elongation of 1.5 is obtained using the #1 stand SD 0.6 and #2 stand MB 0.5 shown in No. 1 of TABLE 2.
  • HR30T hardness
  • the present invention enables the production of a steel plate suitable for manufacturing, for example, cans merely by applying unidirectional rolling using a temper rolling mill provided with two to three stands at most.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Claims (10)

  1. Procédé d'écrouissage à froid pour l'écrouissage à froid d'une tôle d'acier, utilisant un laminoir d'écrouissage muni d'une pluralité de cages de laminage, dans lequel au moins le cylindre de laminoir de la cage à l'extrémité avant est un cylindre de laminoir à rayures brillant ayant une rugosité de surface (Ra) de 1.2 µm ou moins, et au moins un cylindre de laminoir de la dernière cage est un cylindre de laminoir brillant ayant une rugosité de surface (Ra) de 0.5 µm ou moins, caractérisé en ce que l'écrouissage à froid est un laminage à sec et en ce que la tôle d'acier contient 0.012% en poids ou moins de C.
  2. Procédé d'écrouissage à froid selon la revendication 1, dans lequel le laminoir d'écrouissage est un laminoir à deux cages.
  3. Procédé d'écrouissage à froid selon la revendication 1 ou 2, dans lequel la tôle d'acier contient de 0.001 à 0.008% en poids de carbone.
  4. Procédé d'écrouissage à froid selon la revendication 1, 2 ou 3, dans lequel la tôle d'acier contient en outre de 0.005 à 0.2% en poids de Ti et/ou de 0.002 à 0.1% en poids de Nb.
  5. Procédé d'écrouissage à froid selon l'une quelconque des revendications précédentes, dans lequel la tôle d'acier contient en outre pas plus de 0.15% en poids d'Al, pas plus de 0.2% en poids de Si, de 0.1 à 0.5% en poids de Mn, pas plus de 0.05% en poids de P, et pas plus de 0.03% en poids de S.
  6. Laminoir d'écrouissage pour tôle d'acier ayant une pluralité de cages de laminage dans lequel au moins le cylindre de laminoir de la cage à l'extrémité avant est un cylindre de laminoir à rayures brillant ayant une rugosité de surface (Ra) de 1.2 µm ou moins, caractérisé en ce que le cylindre de laminoir de la dernière cage est un cylindre de laminoir brillant ayant une rugosité de surface (Ra) comprise entre 0.15 et 0.3 µm.
  7. Laminoir d'écrouissage selon la revendication 6, qui est un laminoir à deux cages.
  8. Laminoir d'écrouissage selon la revendication 6 ou 7, dans lequel le cylindre de laminoir à rayures brillant de la cage avant a une rugosité de surface d'au moins 0.20 µm.
  9. Laminoir d'écrouissage selon la revendication 8, dans lequel le cylindre de laminoir à rayures brillant de la cage avant a une rugosité de surface comprise entre 0.5 et 1.0 µm.
  10. Laminoir d'écrouissage selon l'une quelconque des revendications 6 à 9, dans lequel le cylindre de laminoir à rayures de la dernière cage est un cylindre de laminoir brillant de type miroir ou un cylindre de laminoir à rayures brillant.
EP99310136A 1998-12-25 1999-12-16 Procédé d'écrouissage à froid pour tôles d'acier et laminoir d'écrouissage Expired - Fee Related EP1013351B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP37029898A JP3783439B2 (ja) 1998-12-25 1998-12-25 鋼板の調質圧延方法
JP37029898 1998-12-25

Publications (3)

Publication Number Publication Date
EP1013351A2 EP1013351A2 (fr) 2000-06-28
EP1013351A3 EP1013351A3 (fr) 2002-11-27
EP1013351B1 true EP1013351B1 (fr) 2004-05-19

Family

ID=18496556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99310136A Expired - Fee Related EP1013351B1 (fr) 1998-12-25 1999-12-16 Procédé d'écrouissage à froid pour tôles d'acier et laminoir d'écrouissage

Country Status (6)

Country Link
EP (1) EP1013351B1 (fr)
JP (1) JP3783439B2 (fr)
KR (1) KR100613948B1 (fr)
DE (1) DE69917416T2 (fr)
TR (1) TR199903256A2 (fr)
TW (1) TW458820B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100771834B1 (ko) * 2001-12-26 2007-10-30 주식회사 포스코 석도원판 제조방법
KR101036637B1 (ko) * 2003-12-30 2011-05-24 주식회사 포스코 초극박 풀 하드 제품 생산방법
JP6451703B2 (ja) * 2016-07-29 2019-01-16 Ｊｆｅスチール株式会社 調質圧延方法及び調質圧延装置
DE102017103308A1 (de) 2017-02-17 2018-08-23 Voestalpine Stahl Gmbh Verfahren zum Herstellen von Stahlblechen
DE102017103303A1 (de) 2017-02-17 2018-08-23 Voestalpine Stahl Gmbh Verfahren zum Herstellen von Stahlblechen
KR20220129627A (ko) * 2020-03-05 2022-09-23 제이에프이 스틸 가부시키가이샤 냉연강판의 조질 압연 방법

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2488532A1 (fr) * 1980-08-18 1982-02-19 Indre Forges Basse Procede de laminage ecrouissant a taux regle pour bandes d'acier doux recuites sous cloche
JP2781297B2 (ja) * 1991-10-29 1998-07-30 川崎製鉄株式会社 耐２次加工脆性に優れ面内異方性の少ない冷延薄鋼板の製造方法
CN1044388C (zh) * 1994-01-26 1999-07-28 川崎制铁株式会社 耐腐蚀性极好的不锈钢板的生产方法
NL9400674A (nl) * 1994-04-27 1995-12-01 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van DKG bandstaal.

Also Published As

Publication number Publication date
JP3783439B2 (ja) 2006-06-07
TR199903256A2 (xx) 2000-07-21
EP1013351A2 (fr) 2000-06-28
DE69917416D1 (de) 2004-06-24
EP1013351A3 (fr) 2002-11-27
TW458820B (en) 2001-10-11
KR20000048403A (ko) 2000-07-25
KR100613948B1 (ko) 2006-08-18
DE69917416T2 (de) 2005-05-19
JP2000197902A (ja) 2000-07-18

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