WO2019103041A1 - Feuille d'acier, procédé pour sa production et laminoir écrouisseur secondaire - Google Patents

Feuille d'acier, procédé pour sa production et laminoir écrouisseur secondaire Download PDF

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Publication number
WO2019103041A1
WO2019103041A1 PCT/JP2018/042995 JP2018042995W WO2019103041A1 WO 2019103041 A1 WO2019103041 A1 WO 2019103041A1 JP 2018042995 W JP2018042995 W JP 2018042995W WO 2019103041 A1 WO2019103041 A1 WO 2019103041A1
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WO
WIPO (PCT)
Prior art keywords
cold rolling
steel plate
stand
ppi
steel sheet
Prior art date
Application number
PCT/JP2018/042995
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English (en)
Japanese (ja)
Inventor
貴文 神宮
榎　久範
西原　英喜
Original Assignee
Ｊｆｅスチール株式会社
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 Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201880073450.XA priority Critical patent/CN111344075B/zh
Priority to JP2019503594A priority patent/JP6673525B2/ja
Publication of WO2019103041A1 publication Critical patent/WO2019103041A1/fr

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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

Definitions

  • the present invention relates to a steel plate excellent in corrosion resistance, a method of manufacturing the same, and a secondary cold rolling mill.
  • a cold rolled steel sheet is manufactured by hot rolling a steel piece, then cold rolling and annealing, followed by temper rolling with a rolling reduction of about 0.5 to 3.0%. .
  • This temper rolling is carried out for the purpose of eliminating the yield point elongation of the steel sheet after annealing, adjusting the surface roughness, correcting the shape, adjusting the surface hardness, etc., and hardly contributes to thinning of the steel sheet.
  • DR rolling secondary cold rolling with a rolling reduction of about 10 to 40% instead of temper rolling (hereinafter sometimes referred to as DR rolling) May be done.
  • the DR rolling contributes to increasing the strength as well as thinning the steel plate, and thus is an effective method for obtaining a hard thin steel plate.
  • DR rolling is performed using a rolling mill having at least two stands of a main reduction stand responsible for rolling at a desired rolling reduction and a plate shape and a finishing stand for adjusting surface roughness.
  • a main reduction stand since it is necessary to have lubricity to obtain a desired reduction ratio, a bright roll which is polished with a grindstone to give a scratch is applied, and wet rolling using lubricating oil is performed.
  • the finishing stand the surface roughness of the steel plate is adjusted by the bright roll having the roughness according to the user's request.
  • Patent Document 1 discloses a method for temper rolling of a low-gloss primary sheet, characterized by rolling using a dull roll and a bright roll that have been subjected to perforation processing. And, in the patent document 1, an embodiment up to a rolling reduction of 35% is disclosed.
  • Patent Document 1 since dull rolls have a low roughness of 0.4 ⁇ m Ra or less and roll processing takes time, for example, preparatory roll preparation when roll surface defects such as roll wrinkles occur with rolling. There is a problem in terms of stable roll supply, such as being in time.
  • Patent Document 1 can not sufficiently prevent the occurrence of wrinkles.
  • the present invention has been made to solve the problems of the prior art as described above, and it is a steel sheet excellent in corrosion resistance while having strength as a can material, a method for producing the same, and The purpose is to provide the following cold rolling mill.
  • the term "strength" as used in the present invention refers to the strength when a steel plate is used as a can material, that is, the desired strength required for a steel can as a storage container for foods, beverages, and the like. This is obtained by securing the conventional DR rolling reduction range (10 to 40%).
  • the present inventors diligently studied to solve the above-mentioned problems.
  • the surface condition of the steel plate is very important in order to obtain a steel plate excellent in scratch resistance, and among them, the 20 degree mirror glossiness, preferably the arithmetic average roughness Ra, peak count (hereinafter referred to as PPI) Control) is found to be important.
  • PPI arithmetic average roughness
  • the balance between the HR30T hardness and the 20 degree mirror gloss is important.
  • the present invention has been made based on such findings, and the summary thereof is as follows. [1] A steel plate having a HR30T hardness of 68 or more and a 20 ° specular gloss of 120 or less.
  • a secondary cold rolling mill having a finishing stand which is a final stand and at least two stands of a main reduction stand which is a front stage stand thereof, wherein the main reduction stand has an arithmetic mean roughness Ra of 0..
  • a secondary cold rolling mill comprising bright rolls of 15 to 0.25 ⁇ m, the finishing stand comprising dull rolls having an arithmetic mean roughness Ra of 1.5 to 3.0 ⁇ m and a PPI of 250 or more.
  • % which shows the component of steel is all the mass%.
  • a steel plate excellent in brazing resistance can be obtained.
  • the manufacturing method of the present invention it is possible to stably manufacture a high strength steel plate excellent in corrosion resistance preferred by the user while securing the conventional DR rolling reduction range (10 to 40%). It becomes.
  • the steel plate of the present invention is formed into a can, the surface gloss is excellent, and the occurrence of rubbing and scratching of the steel plates is also prevented and the surface appearance is also excellent.
  • the steel plate of the present invention is suitable as a raw material for food cans and beverage cans, particularly powdered milk cans.
  • the steel plate of the present invention has an HR30T hardness of 68 or more, and a 20 ° specular gloss of 120 or less. More preferably, the arithmetic mean roughness Ra of the steel sheet surface is 0.50 to 0.80 ⁇ m, and the PPI is 200 to 300.
  • HR30T hardness 68 or more
  • the HR30T hardness is less than 68, for example, desired strength when formed into a can can not be obtained. Therefore, the lower limit of the HR30T hardness is 68.
  • the upper limit of the hardness exceeds 85, it is too hard, and there is a risk that the can-making process for food cans and beverage cans may become difficult. Therefore, it is preferable to set the HR30T hardness to 85 or less, which is the upper limit of the hardness of the maximum refining degree DR-10 specified in JIS G 3303.
  • the HR30T hardness is more preferably 70 or more, and preferably 82 or less from the viewpoint of the balance between can strength and processability.
  • HR30T hardness can be measured by the method as described in the Example mentioned later.
  • 20 degree specular gloss 120 or less
  • the upper limit of the 20-degree specular gloss is set to 120.
  • the mirror glossiness at 20 degrees is too low, the appearance difference may occur in the surface of the steel sheet, and as a result, there may be a problem in the appearance of the can. Therefore, it is preferable to set the 20 degree specular gloss to 50 or more.
  • the 20 ° specular gloss is preferably 60 or more, and preferably 110 or less, in order to obtain a more stable appearance and anti-sticking property.
  • 20-degree specular glossiness can be measured by the method as described in the Example mentioned later.
  • the 20-degree specular gloss can be measured using a gloss meter.
  • Arithmetic mean roughness Ra 0.50 to 0.80 ⁇ m The wrinkles occur, for example, due to contact between cans even after the steel plate is formed into cans. For the prevention of contact wrinkles, it is preferable to secure Ra of 0.50 ⁇ m or more.
  • the arithmetic mean roughness Ra of the steel sheet surface is preferably 0.50 to 0.80 ⁇ m.
  • the arithmetic mean roughness Ra of the steel sheet surface is more preferably 0.55 ⁇ m or more, and more preferably 0.75 ⁇ m or less.
  • arithmetic mean roughness Ra of the steel plate surface can be measured by the method as described in the Example mentioned later.
  • Peak count (PPI) 200 to 300 The higher the PPI, the lower the gloss and the better the scratch resistance. As for PPI, 200 or more are preferred for prevention of contact wrinkles of steel plates. On the other hand, when PPI exceeds 300, it may become an appearance problem. Therefore, PPI is preferably 300 or less. The PPI is more preferably 220 or more, and more preferably 270 or less.
  • the peak count (PPI) refers to the number of peaks per inch (peak number) (Peaks Per Inch) in the surface roughness roughness curve defined by the US SAE 911 standard. is there. Moreover, peak count (PPI) can be measured by the method as described in the Example mentioned later.
  • the component composition of the steel plate is not limited.
  • the thickness is preferably 0.10 to 0.60 mm from the viewpoint of thinning as much as possible while obtaining desired strength.
  • the steel plate of the present invention is manufactured by hot rolling, primary cold rolling, annealing, and then secondary cold rolling of steel slabs.
  • secondary cold rolling for example, a bright roll having an arithmetic average roughness Ra of 0.15 to 0.25 ⁇ m, and an arithmetic average roughness Ra of 1.5 to 3.0 ⁇ m and a PPI of 250 or more. It is decided to carry out using Darroll.
  • the main press stand is equipped with a bright roll with an arithmetic mean roughness Ra of 0.15 to 0.25 ⁇ m, and the finish stand is a dull roll having an arithmetic mean roughness Ra of 1.5 to 3.0 ⁇ m and a PPI of 250 or more.
  • the HR30T hardness is 68 or more, and the 20 degree mirror glossiness is 120 or less by preferably performing the second cold rolling using the provided secondary cold rolling mill, and preferably the arithmetic mean of the steel sheet surface
  • a steel plate having a roughness Ra of 0.50 to 0.80 ⁇ m and a peak count (PPI) of 200 to 300 can be obtained.
  • a bright roll having an arithmetic average roughness Ra of 0.15 to 0.25 ⁇ m is used as a work roll of the main press stand.
  • a DR rolling reduction of 10 to 40% is required.
  • a bright roll capable of wet rolling using a lubricating oil is used as a main reduction stand.
  • Arithmetic mean roughness Ra 0.15 to 0.25 ⁇ m If the work roll roughness of the main pressure stand is less than 0.15 ⁇ m in Ra, the gloss of the final product plate will be high, while if it exceeds 0.25 ⁇ m in Ra, the desired rolling reduction may not be obtained.
  • the work roll roughness of the main reduction stand should be 0.15 to 0.25 ⁇ m in Ra.
  • the work roll roughness of the main reduction stand is Ra, and is preferably 0.17 ⁇ m or more, more preferably 0.23 ⁇ m or less, in order to ensure stable operation.
  • Work roll of finish stand As work roll of finish stand, dull roll with arithmetic mean roughness Ra of 1.5 to 3.0 ⁇ m and PPI of 250 or more is used to give the surface of the steel plate with the specified roughness. .
  • the surface roughness of the dull rolls can be adjusted, for example, by electrical discharge machining.
  • Arithmetic mean roughness Ra is 1.5 to 3.0 ⁇ m If the roughness of the work roll of the finishing stand is less than 1.5 ⁇ m in Ra, the desired low gloss can not be obtained, and if it exceeds 3.0 ⁇ m in Ra, the roughness of the product plate becomes too high. Therefore, the work roll roughness of the finishing stand is set to 1.5 ⁇ m to 3.0 ⁇ m in Ra.
  • the work roll roughness of the finishing stand is Ra, and in order to obtain a stable product appearance, it is more preferably 1.7 ⁇ m or more, and more preferably 2.5 ⁇ m or less.
  • PPI 250 or more If PPI of work roll surface of finishing stand is less than 250, desired low glossiness can not be obtained. Therefore, the lower limit of PPI of the work roll surface of the finishing stand is 250.
  • PPI of the work roll surface of the finishing stand is preferably 350 or less.
  • the PPI of the work roll surface of the finishing stand is more preferably 270 or more, and more preferably 320 or less.
  • the rolling mill in manufacturing the steel plate of the present invention, has a finishing stand which is a final stand and at least two stands of a main pressing stand which is a front stage thereof. Is equipped with a bright roll having an arithmetic mean roughness Ra of 0.15 to 0.25 ⁇ m, and the finishing stand is a secondary having a dull roll having an arithmetic mean roughness Ra of 1.5 to 3.0 ⁇ m and a PPI of 250 or more. It is preferred to use a cold rolling mill.
  • the secondary cold rolling mill generally has a finishing stand which is a final stand and two stands of a main reduction stand which is a front stage stand thereof, but may have a stand for temper rolling in front of the main reduction stand. In that case, the work roll of the stand for temper rolling before the main reduction stand may be either a bright roll or a dull roll, but the dull roll is more preferable from the viewpoint of lowering the gloss.
  • the steel sheet of the present invention can be used without plating treatment or after plating treatment to obtain effects.
  • the plating treatment include Ni-based plating, tin plating and the like.
  • the amount of metal chromium may be provided on the surface of the tin plating layer in order to ensure corrosion resistance and corrosion resistance.
  • chromium hydrate oxide may be further formed on the surface of metal chromium.
  • Hot rolling, primary cold rolling, and annealing were performed on the steel having the following composition.
  • secondary cold rolling was implemented on the conditions shown in Table 1 using the secondary cold rolling mill (DR rolling mill) which consists of 2 stands.
  • the rolling speed of DR rolling is 800 mpm, and all the main pressing stands are rolling using lubricating oil.
  • electric discharge machining was used in this embodiment.
  • predetermined rolling reduction indicates whether or not 20-25% can be secured as the DR rolling reduction, and if it can be secured, "o" is written, and if it can not be secured "X" was noted.
  • the HR30T hardness, the 20 degree specular gloss, the arithmetic average roughness Ra, and the PPI were measured by the methods described below. Further, the scratch resistance was evaluated by the method described below.
  • HR30 T hardness HR30 T hardness was measured by the method defined in JIS Z 2245.
  • Arithmetic mean roughness Ra Arithmetic mean roughness Ra was measured using a stylus type surface roughness meter in accordance with JIS B 0601 (2001).
  • PPI PPI can be measured using a stylus surface roughness meter.
  • a standard reference level (cut level: 0.635 ⁇ m) was provided to the mean line of the roughness curve for a length of 1 inch (25.4 mm) in the direction of the mean line of the roughness curve, and a negative reference level was exceeded. When it exceeds the positive reference level, it counts one. The total number of counts when doing this is called PPI.
  • Corrosion resistance The steel plate obtained by the above was made into can processing, the steel plates after can were made to contact, and the presence or absence of the scraping of the steel plate surface was evaluated.
  • Table 1 in the case of the presence or absence of the presence of the dirt is "x”, the case of the absence is "o”, and the o is considered to be good.
  • Comparative Example 1 As a result of applying a work roll having a low degree of roughness of the main reduction stand, the 20 ° specular gloss of the steel sheet was out of the range of the present invention, and the surface gloss was high and the scratch resistance was poor.
  • Comparative Example 2 As a result of applying a work roll having a low work roll roughness to the finishing stand, the 20 ° specular gloss was out of the range of the present invention, and the scratch resistance was inferior.
  • the work roll roughness Ra of both the main reduction stand and the finish stand is within the range of the present invention in Comparative Example 3, the 20 ° specular gloss is out of the range of the present invention because the work roll PPI of the finish stand is low. Sex was also inferior.
  • a predetermined rolling reduction could not be secured.

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

Abstract

L'invention concerne : une feuille d'acier présentant une excellente résistance aux rayures ; un procédé de production de cette feuille d'acier ; et un laminoir écrouisseur secondaire. Une feuille d'acier selon la présente invention a une dureté HR30T de 68 ou plus et un brillant spéculaire à 20° de 120 ou moins. Cette feuille d'acier est produite en soumettant séquentiellement une barre d'acier à un laminage à chaud, un premier laminage à froid et un recuit dans cet ordre, puis à un second laminage à froid à l'aide d'un rouleau poli qui a une rugosité moyenne arithmétique Ra de 0,15 à 0,25 µm et un rouleau terne qui a une rugosité moyenne arithmétique Ra de 1,5 À 3,0 µm et un PPI de 250 ou plus.
PCT/JP2018/042995 2017-11-27 2018-11-21 Feuille d'acier, procédé pour sa production et laminoir écrouisseur secondaire WO2019103041A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880073450.XA CN111344075B (zh) 2017-11-27 2018-11-21 钢板及其制造方法以及二次冷轧机
JP2019503594A JP6673525B2 (ja) 2017-11-27 2018-11-21 鋼板およびその製造方法、ならびに二次冷間圧延機

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-226390 2017-11-27
JP2017226390 2017-11-27

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WO2019103041A1 true WO2019103041A1 (fr) 2019-05-31

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0890119A (ja) * 1994-09-20 1996-04-09 Nippon Steel Corp 優れたフランジ成形性と強度を有する軽量スチール缶
JP2006167783A (ja) * 2004-12-17 2006-06-29 Nippon Steel Corp 缶用素材鋼板及びその調質圧延方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4305814B2 (ja) * 2001-12-04 2009-07-29 Ｊｆｅスチール株式会社 高光沢冷延鋼板の製造方法
JP4325436B2 (ja) * 2004-02-27 2009-09-02 Ｊｆｅスチール株式会社 缶用鋼板用原板と缶用鋼板およびそれらの製造方法
JP2005319480A (ja) * 2004-05-07 2005-11-17 Jfe Steel Kk 低光沢度めっき原板の製造方法
JP5135868B2 (ja) * 2007-04-26 2013-02-06 Ｊｆｅスチール株式会社 缶用鋼板およびその製造方法
WO2009123356A1 (fr) * 2008-04-03 2009-10-08 Ｊｆｅスチール株式会社 Tôle d'acier à haute résistance pour boîte métallique et procédé de fabrication de ladite tôle d'acier à haute résistance
AU2014291557B2 (en) * 2013-07-17 2017-07-13 Jfe Steel Corporation Steel sheet for can, and method for manufacturing same
JP5900712B2 (ja) * 2014-03-28 2016-04-06 Ｊｆｅスチール株式会社 缶用鋼板およびその製造方法
EP3138935B1 (fr) * 2014-04-30 2018-09-26 JFE Steel Corporation Tôle d'acier à haute résistance pour contenant, et son procédé de production
CN106544588B (zh) * 2015-09-17 2019-03-26 上海梅山钢铁股份有限公司 一种单面印涂耐烘烤花架印的镀锡钢板及其制造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0890119A (ja) * 1994-09-20 1996-04-09 Nippon Steel Corp 優れたフランジ成形性と強度を有する軽量スチール缶
JP2006167783A (ja) * 2004-12-17 2006-06-29 Nippon Steel Corp 缶用素材鋼板及びその調質圧延方法

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CN111344075A (zh) 2020-06-26
CN111344075B (zh) 2022-07-08
JPWO2019103041A1 (ja) 2019-12-12
JP6673525B2 (ja) 2020-03-25

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