WO2015019409A1 - Procédé pour la production de bande d'acier à faible teneur en carbone laminée à froid - Google Patents

Procédé pour la production de bande d'acier à faible teneur en carbone laminée à froid Download PDF

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Publication number
WO2015019409A1
WO2015019409A1 PCT/JP2013/071193 JP2013071193W WO2015019409A1 WO 2015019409 A1 WO2015019409 A1 WO 2015019409A1 JP 2013071193 W JP2013071193 W JP 2013071193W WO 2015019409 A1 WO2015019409 A1 WO 2015019409A1
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WO
WIPO (PCT)
Prior art keywords
cold
steel strip
rolled
rolling
roll
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PCT/JP2013/071193
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English (en)
Japanese (ja)
Inventor
洋一 谷村
Original Assignee
日新製鋼株式会社
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Publication date
Application filed by 日新製鋼株式会社 filed Critical 日新製鋼株式会社
Priority to CN201380077756.XA priority Critical patent/CN105377458B/zh
Priority to PCT/JP2013/071193 priority patent/WO2015019409A1/fr
Publication of WO2015019409A1 publication Critical patent/WO2015019409A1/fr

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    • 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
    • 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
    • B21B2001/228—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 skin pass rolling or temper rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips

Definitions

  • the present invention relates to a method for producing a low carbon steel cold-rolled steel strip excellent in surface smoothness.
  • a low carbon steel cold-rolled steel strip excellent in surface smoothness is manufactured by temper rolling a cold-rolled steel strip that has been cold-rolled to a predetermined thickness.
  • temper rolling a bright roll is used as a work roll, and the smooth surface of the bright roll is transferred to a material to be rolled (cold rolled steel strip), so that the surface of the rolled material is finished in a smooth state.
  • temper rolling two methods of wet temper rolling and dry temper rolling are widely known.
  • temper rolling oil lubricating oil
  • temper rolling oil lubricating oil
  • indentation flaws generated on the material to be rolled are prevented. . Note that the indentation occurs when foreign matter is caught between the work roll and the material to be rolled and the foreign matter is pushed into the material to be rolled.
  • dry temper rolling is temper rolling in a state where the material to be rolled and the work roll are almost dry without supplying temper rolling oil (lubricating oil) to the surface of the material to be rolled and the work roll. is there.
  • temper rolling oil lubricating oil
  • the smooth surface of the bright roll is efficiently transferred to the material to be rolled.
  • since there is no cleaning action of temper rolling oil foreign matter is likely to adhere to the material to be rolled and the work roll, and indentation wrinkles are likely to occur.
  • the manufacturing method of the low carbon steel cold-rolled steel strip currently disclosed by patent document 1 degrease-cleans the cold-rolled steel strip which consists of low carbon steel, Then, this cold-rolled steel strip is dry-temper-rolled with a bright roll. Is.
  • this method of manufacturing a low-carbon steel cold-rolled steel strip after the fats and oils and foreign matter adhering to the surface of the material to be rolled (cold-rolled steel strip) are removed by the degreasing cleaning treatment, Since the dry temper rolling is performed, the material to be rolled can be temper-rolled with less adhesion of foreign matters, and a product steel strip excellent in surface smoothness can be produced.
  • the degreasing cleaning treatment can remove foreign matter adhering to the surface of the cold-rolled steel strip to some extent, but the degreasing cleaning is performed. It is difficult to remove foreign matter adhering to the material to be rolled after processing and foreign matter adhering to the work roll of the dry temper rolling mill. Therefore, indentation flaws may sometimes occur on the surface of the product steel strip after dry temper rolling. In order to prevent foreign matter from adhering to the surface of the work roll of the dry temper rolling mill, it is possible to ensure that foreign matter adheres to the surface of the work roll even if the dry temper rolling mill and its surroundings are thoroughly cleaned. It is difficult to prevent.
  • wet temper rolling is adopted instead of dry temper rolling, foreign matter adhering to the surface of the material to be rolled and the work roll can be completely removed by the cleaning action of the temper rolling oil, and indentation flaws are generated. Can be prevented.
  • the transfer efficiency of the smooth surface of the bright roll with respect to the material to be rolled is reduced, and the surface smoothness of the product steel strip is required to be constant (for example, the surface roughness Ra). May be less than 0.3 ⁇ m).
  • the present invention was devised in view of the above-mentioned problems, and when wet temper rolling is used to prevent the occurrence of indentation flaws in the cold-rolled steel strip, and when dry tempering pressure is adopted. It aims at providing the manufacturing method of the low carbon steel cold-rolled steel strip which can manufacture the cold-rolled steel strip which has surface smoothness comparable as the cold-rolled steel strip manufactured.
  • the method for producing a low-carbon steel cold-rolled steel strip according to the present invention is based on the assumption that the steel strip made of low-carbon steel is cold-rolled and then subjected to wet temper rolling using a bright roll. Is characterized in that at least one pass is carried out using a dull roll and then the final pass is carried out using a smooth roll.
  • the surface roughness Ra of the cold-rolled steel strip subjected to the wet temper rolling is 0.3 ⁇ m or less.
  • the smooth roll has a surface roughness Ra of 0.1 ⁇ m to 0.3 ⁇ m.
  • the surface roughness Ra of the dull roll is 1.0 ⁇ m to 1.8 ⁇ m.
  • the method for producing a low-carbon steel cold-rolled steel strip of the present invention it is possible to prevent the occurrence of indentation or the like in the product steel strip without reducing the surface smoothness of the product steel strip.
  • This low carbon steel cold-rolled steel strip manufacturing method uses a low-carbon steel slab prepared in a predetermined steel composition as a raw material, and cold-rolls the steel strip obtained through a hot rolling process, pickling process, etc. After that, wet temper rolling is performed.
  • wet temper rolling it is possible to omit the degreasing cleaning process for removing the cold rolling oil or the like adhering to the material to be rolled after the cold rolling.
  • work hardening due to cold rolling is unlikely to occur in low carbon steel, it is possible to omit the step of annealing the material to be rolled after cold rolling and before wet temper rolling.
  • the steel material type of the low-carbon steel cold-rolled steel strip is, for example, a low-carbon steel having a C content of 0.12% by mass or less.
  • a typical example of this low carbon steel is “SPCC” described in the “Reference” column of JIS G 3141 “Cold rolled steel sheet and steel strip”. This SPCC has a C content of 0.12% by mass or less, an Mn content of 0.50% by mass or less, a P content of 0.040% by mass or less, and an S content of 0.045% by mass or less.
  • the balance consists of Fe and inevitable impurities.
  • the cold rolling mill that performs the cold rolling for example, a lever type cold rolling mill capable of reversing the rolling direction can be used.
  • a dull roll is used in the first pass.
  • the dull roll is continuously used unless it is the final pass.
  • the dull roll preferably has a surface roughness Ra of 1.0 ⁇ m to 1.8 ⁇ m, and the smooth roll has a surface roughness Ra of 0.1 ⁇ m to 0.3 ⁇ m. Is desirable.
  • the number of passes is not particularly limited.
  • the surface roughness Ra is a center line average roughness defined in JIS B 0601.
  • the cold rolling reduction ratio is appropriately determined according to the use of the steel strip, and is preferably about 50% to 70%, for example.
  • a bright roll is used as a work roll of a wet temper rolling mill, and rolling is performed while supplying temper rolling oil (lubricating oil) to both the work roll and the material to be rolled.
  • the elongation ( ⁇ ) of the steel strip in wet temper rolling needs to be controlled in the range of 0.2 to 1.5%.
  • the width load corresponding to the elongation ( ⁇ ) is about 0.3 to 0.7 Ton / mm.
  • the reason why the elongation ( ⁇ ) is limited to the above range (0.2 to 1.5%) is that the temper rolling with a lower elongation than this has a weak transfer effect on the roll surface and the smoothness of the surface of the product steel strip. This is because temper rolling exceeding the above range causes a significant decrease in the ductility of the product steel strip, making it difficult to ensure good press workability.
  • the preferred elongation ( ⁇ ) is about 0.4 to 1.0%, and most preferably 0.6 to 0.8%.
  • the applicant of the present application has previously performed cold rolling using a smooth roll having a surface roughness Ra of 0.4 ⁇ m to 0.6 ⁇ m in all passes as a work roll of a cold rolling mill. After degreasing and cleaning, dry temper rolling was performed to produce a product steel strip (low carbon steel cold-rolled steel strip) that satisfies a certain specification (for example, surface roughness Ra is 0.3 ⁇ m or less).
  • a product steel strip low carbon steel cold-rolled steel strip
  • a certain specification for example, surface roughness Ra is 0.3 ⁇ m or less.
  • the inventor of the present application adopted a wet temper rolling as a temper rolling, and on the premise that generation of indentation flaws is completely prevented, It came to solve it paying attention to the surface roughness of the work roll used in rolling. That is, as described above, in cold rolling, the first pass uses a dull roll, and the second pass and beyond, except when the final pass is used, the dull roll is used continuously, and the smooth pass is used in the final pass. It was found that the product steel strip after wet temper rolling can satisfy the above-mentioned certain specifications.
  • the reason why the product steel strip can satisfy the above-mentioned specific specifications by changing the surface roughness of the work roll of the cold rolling mill is considered to be related to the formation of oil pits.
  • cooling and lubrication of the material to be rolled and the work roll are performed while supplying rolling oil to the material to be rolled and the work roll.
  • Ra surface roughness
  • the rolling oil enters the irregularities on the surface of the dull roll and the surface functions as an oil pit when the dull roll is used. Oil pits are hardly formed on the rolled material. Then, in the final pass, by using a smooth roll having a surface roughness Ra of 0.1 ⁇ m to 0.3 ⁇ m (having a surface roughness much smaller than the previously used smooth roll), the coated film after cold rolling is used.
  • the surface roughness of the rolled material is much smaller than before, and even if the transfer efficiency of the bright roll to the material to be rolled is reduced in wet temper rolling, it compensates for the decrease in the transfer efficiency, and after temper rolling
  • the surface roughness of the product steel strip can be secured sufficiently. That is, it becomes possible to satisfy the certain specification (surface roughness Ra is 0.3 ⁇ m or less).
  • the wet roll is adopted as the temper rolling performed after the cold rolling, and the work roll of the temper rolling mill
  • the tempered rolling oil is supplied to both the rolled material and the rolled material, and the foreign matter adhering to the work roll and the surface of the rolled material is washed away by the cleaning action of the tempered rolling oil, so that the occurrence of indentation flaws in the rolled material is prevented. can do.
  • the first pass of cold rolling uses a dull roll having a surface roughness Ra of 1.0 ⁇ m to 1.8 ⁇ m, and the second pass and thereafter continue to use the same dull roll except for the final pass.
  • a low-carbon steel slab is used as a raw material, and cold rolling is performed on a material to be rolled obtained through hot rolling and pickling treatment (descaling treatment) of a hot-rolled steel sheet.
  • cold rolling a dull roll having a surface roughness Ra of 1.0 ⁇ m to 1.8 ⁇ m is used as a work roll in the first to fourth passes, and the surface roughness Ra is 0.1 ⁇ m to 0.3 ⁇ m in the fifth pass as the final pass.
  • the smooth roll is used as a work roll.
  • a product steel strip (low-carbon steel cold-rolled steel strip) having a surface roughness adjusted by wet temper rolling was obtained without degreasing and washing the cold-rolled steel strip obtained in this way.
  • This steel strip is a plate material equivalent to SPCC-1B (JIS G3141) (tempering classification: hard, surface finishing classification: bright finish).
  • a low-carbon steel slab is used as a raw material, and the rolled material obtained through hot rolling and pickling treatment of a hot-rolled steel plate is 1-5.
  • Cold rolling is performed using a smooth roll with a surface roughness Ra of 0.4 ⁇ m to 0.6 ⁇ m as a work roll up to the pass, and the resulting cold-rolled steel strip is degreased and washed, and then dry tempered
  • a product steel (low-carbon steel cold-rolled steel strip) strip whose surface roughness was adjusted by rolling was also obtained.
  • This steel strip is also a plate material equivalent to SPCC-1B (JIS G3141) (tempering classification: hard, surface finishing classification: bright finish).
  • the steel composition, hot rolling conditions, and cold rolling conditions in the manufacturing method according to the embodiment of the present invention and the conventional manufacturing method are as follows (1) to (3). That is, (1) Steel composition has a C content of 0.02 to 0.06 mass%, an Mn content of 0.4 to 0.48 mass%, a P content of 0.02 mass%, and an S content. Is 0.01% by mass. (2)
  • the hot rolling conditions are a hot rolling finishing temperature of 875 to 935 ° C. and a winding temperature of 535 to 635 ° C. (3)
  • the cold rolling conditions are a rolling reduction of 52.6% and a cold-rolled sheet thickness of 1.61 mm.
  • a bright roll having a smooth surface subjected to a wet grinding process (using a grinding wheel of grain size # 320) was used as a work roll.
  • “ND-10 Kai” manufactured by Daido Chemical Co., Ltd.
  • the steel strip elongation was 0.6 to 0.7%.
  • FIG. 1 shows the measurement result of the surface roughness of the product steel strip obtained by the manufacturing method according to the embodiment of the present invention, and the measurement result of the surface roughness of the product steel strip obtained by the previous manufacturing method of FIG. Indicates.
  • the product steel strip obtained by the manufacturing method according to the embodiment of the present invention has an N number (production number) of 21 and an average value of the surface roughness Ra of 0.148 (0.154).
  • the standard deviation was 0.011 (0.011), the maximum value was 0.169 (0.171), and the minimum value was 0.125 (0.132).
  • the value outside () shows the surface (namely, upper surface) of a steel strip
  • the value inside () shows the back surface (namely, lower surface) of a steel strip. No indentation flaws were found in the product steel strip obtained by this manufacturing method.
  • the product steel strip obtained by the conventional manufacturing method has an N number (production number) of 304 (304), an average value of the surface roughness Ra of 0.151 (0.169), and a standard deviation.
  • the maximum value was 0.035 (0.033), the maximum value was 0.284 (0.292), and the minimum value was 0.078 (0.075).
  • the present invention can be applied to, for example, a production line for producing a low-carbon steel cold-rolled steel strip excellent in surface smoothness, and the produced low-carbon steel cold-rolled steel strip includes mechanical parts, electric / electronic It is suitably used for equipment parts, automobile parts and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

La présente invention pour objet de produire une bande d'acier laminée à froid n'ayant pas de défauts en forme d'indentation par adoption d'un laminage à froid en voie humide, la bande d'acier laminée à froid étant comparable en termes de caractère lisse de la surface à la bande d'acier laminée à froid produite dans le cas de l'adoption d'un laminage à froid à sec. Selon l'invention, une bande d'acier constituée d'acier à faible teneur en carbone est laminée à froid et ensuite soumise à un laminage à froid en voie humide à l'aide de rouleaux à fini brillant pour de cette manière produire une bande d'acier à faible teneur en carbone laminée à froid qui a une rugosité de surface Ra inférieure ou égale à 0,3 μm. Le laminage à froid est effectué de façon à ce qu'au moins une passe soit effectuée à l'aide de rouleaux à fini terne ayant une rugosité de surface Ra de 1,0-1,8 μm et après cela la passe finale soit effectuée à l'aide de rouleaux lisses ayant une rugosité de surface Ra de 0,1-0,3 μm.
PCT/JP2013/071193 2013-08-06 2013-08-06 Procédé pour la production de bande d'acier à faible teneur en carbone laminée à froid WO2015019409A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201380077756.XA CN105377458B (zh) 2013-08-06 2013-08-06 低碳钢冷轧钢带的制造方法
PCT/JP2013/071193 WO2015019409A1 (fr) 2013-08-06 2013-08-06 Procédé pour la production de bande d'acier à faible teneur en carbone laminée à froid

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Application Number Priority Date Filing Date Title
PCT/JP2013/071193 WO2015019409A1 (fr) 2013-08-06 2013-08-06 Procédé pour la production de bande d'acier à faible teneur en carbone laminée à froid

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CN111974802B (zh) * 2020-07-23 2022-03-01 柳州钢铁股份有限公司 冷连轧超低粗糙度高强钢光面板及其罩式退火生产方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04253504A (ja) * 1991-02-01 1992-09-09 Sumitomo Metal Ind Ltd 表面清浄な冷延鋼板の製造装置と製造方法
JPH08215705A (ja) * 1995-02-13 1996-08-27 Sumitomo Metal Ind Ltd 調質圧延方法
JP2007130679A (ja) * 2005-11-14 2007-05-31 Nisshin Steel Co Ltd 表面平滑性に優れた低炭素鋼冷延鋼帯の製造方法

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Publication number Priority date Publication date Assignee Title
JP2915667B2 (ja) * 1991-12-27 1999-07-05 新日本製鐵株式会社 高度の表面光沢を有する金属ストリップ及びその製造方法
JPH1177123A (ja) * 1997-09-03 1999-03-23 Nkk Corp 冷間圧延機のダル圧延制御方法
EP2098309B1 (fr) * 2006-12-18 2014-04-16 JFE Steel Corporation Procédé de laminage à froid d'une bande d'acier et procédé de fabrication d'une feuille d'acier laminée à froid ayant une résistance élevée
IN2012DN03833A (fr) * 2009-12-15 2015-08-28 Mitsubishi Hitachi Metals
CN101869910A (zh) * 2010-06-04 2010-10-27 山东泰山建能机械集团有限公司 冷轧不锈钢带特殊表面的加工方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04253504A (ja) * 1991-02-01 1992-09-09 Sumitomo Metal Ind Ltd 表面清浄な冷延鋼板の製造装置と製造方法
JPH08215705A (ja) * 1995-02-13 1996-08-27 Sumitomo Metal Ind Ltd 調質圧延方法
JP2007130679A (ja) * 2005-11-14 2007-05-31 Nisshin Steel Co Ltd 表面平滑性に優れた低炭素鋼冷延鋼帯の製造方法

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CN105377458B (zh) 2017-03-08

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