EP3307452B1 - Objet laminé en acier inoxydable et son procédé de fabrication - Google Patents

Objet laminé en acier inoxydable et son procédé de fabrication Download PDF

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Publication number
EP3307452B1
EP3307452B1 EP15735737.7A EP15735737A EP3307452B1 EP 3307452 B1 EP3307452 B1 EP 3307452B1 EP 15735737 A EP15735737 A EP 15735737A EP 3307452 B1 EP3307452 B1 EP 3307452B1
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EP
European Patent Office
Prior art keywords
pattern
polygons
stainless steel
rolling
object according
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.)
Active
Application number
EP15735737.7A
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German (de)
English (en)
French (fr)
Other versions
EP3307452A1 (fr
Inventor
Didier VIL
Jean Michel Damasse
Françoise Haegeli
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.)
Aperam SA
Original Assignee
Aperam SA
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Publication date
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Priority to PL15735737T priority Critical patent/PL3307452T3/pl
Publication of EP3307452A1 publication Critical patent/EP3307452A1/fr
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Publication of EP3307452B1 publication Critical patent/EP3307452B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • 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
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B21H8/005—Embossing sheets or rolls

Definitions

  • the present invention relates to the field of stainless steels in the form of rolled flat products, in particular strips, plates and sheets, or products cut and / or shaped from such strips, plates and sheets.
  • Stainless steels are used in many fields to form objects intended to remain visible and to have a clean surface appearance and attractive to the eye by its brilliance. This is particularly the case when they are used to make furniture, appliances, cutlery, facades of buildings ...
  • the layer of varnish is not significantly deteriorated during the use of the object, which is not guaranteed when the object is likely to being subjected to friction during use (for example, knives, kitchen worktops, etc.).
  • the coating is likely to be damaged if, after its application, the treated object must be shaped by stamping, folding or otherwise. And applying the coating only after this shaping would not always be possible or easy.
  • EP-A-2,881,194 (See as well CN 104626865 A ) describes a metal panel (stainless steel or AI for example) to form the outdoor decor of a home appliance. It has on one of its surfaces a hollow pattern, and on the other of its surfaces a relief pattern which results from the transfer on said other surface of the force which led to print the recessed pattern on the first surface.
  • the object of the invention is to provide manufacturers of stainless steel or stainless steel objects with rolled products which are not sensitive to fingerprints, and this certainly lasting, without this affecting too much. the duration and cost of the manufacture of the objects or semi-finished products from which they come.
  • the subject of the invention is a laminated stainless steel object, characterized in that its surface has a raised and recessed pattern comprising a random juxtaposition of at least two species of polygons, each of said polygons having at least three sides, having an area of between 1 and 9 mm 2 , a difference between its smallest and largest dimension between 0.5 and 3 mm, each polygon consisting of substantially parallel straight striations, each deviating ⁇ 15 ° relative to the average orientation of the ridges, from 5 to 30 ⁇ m deep separated by ridge lines, and the axes of which are distant from 0.1 to 0.3 mm, and of which a spectral analysis by Fourier, made on a square of at least 100 mm 2 , shows that it has an isotropy of at least 40% between the rolling direction and the cross direction, and among the three main preferred angular orientations es, two neighboring preferential angular orientations are spaced at least 20 ° and at most 60 °.
  • the reference plane of each polygon is inclined relative to the reference planes of its contiguous polygons, from 1 to 10 °.
  • the spectral analysis of its surface has between three and eight preferred angular orientations.
  • flanks of said grooves have curved surfaces and / or with asperities.
  • It can be a sheet, a plate or a strip.
  • the object may have been produced by cutting and / or shaping a sheet, a plate or a strip of the preceding type, constituting a precursor of said object
  • the invention also relates to a method of manufacturing an object of the above type, characterized in that said surface having said pattern is obtained during the rolling of the object, or a precursor of said object, by the pressure of a rolling cylinder on the surface of the object or its precursor, said cylinder itself having on its surface a pattern for obtaining said pattern on the surface of the object.
  • the invention consists in printing, during a rolling, on the surface of the object, or on the surface of a semi-product which would be a precursor, a pattern engraved in reliefs and hollow of a particular type well defined.
  • This ground is based on a random juxtaposition of at least two species of polygons, not necessarily regular, having at least three sides.
  • the planes of the neighboring polygon surfaces are preferably slightly inclined relative to each other.
  • the polygons each delimit an area where there are substantially parallel streaks of defined depths and widths. They each have an area of between 1 and 9 mm 2 , a difference between their smallest and their largest dimension between 0.5 and 3 mm, and the reference plane of each polygon is inclined from 1 to 10 ° relative to to that of its immediate neighbor polygons.
  • Each polygon consists of substantially parallel ridges, that is to say each deviating ⁇ 15 ° from the average orientation of the streaks. They are from 5 to 30 ⁇ m deep and are separated by ridge lines. Their axes are 0.1 to 0.3 mm apart.
  • Fourier transform spectral analysis of the surface of the object carried out on a square of at least 100 mm 2 area, shows that it has an isotropy of at least 40% between the rolling direction and the transverse direction. and among the three main preferred angular orientations determined by the spectral analysis, two neighboring orientations are spaced from 20 to 60 °.
  • the pattern printed on the surface of the object has between three and eight preferred angular orientations. Beyond eight such preferential orientations, it is no longer certain that the angular difference between two neighboring preferential orientations would still be sufficient for the desired effect of attenuation of fingerprints to be correctly obtained.
  • the depth of the streaks from 5 to 30 ⁇ m is justified by the fact that below 5 ⁇ m, the impression would be too difficult to achieve and its result would not be any more effective enough. Above 30 ⁇ m, the anti-fingerprint effect obtained is not significantly improved, and one may end up with a roughness of the sheet which could be excessive for certain applications. The engraving of the rolling mill rolls with such a level of roughness would also be problematic.
  • the inventors have also tested other types of etching of the surface of stainless steel sheets. An example of such another type of etching will be described later. But it turned out that the type of engraving according to the invention was the most suitable, among those tested, to confer on the surface the particularities of isotropy and multidirectional reflection that best solve the problem of the visibility of fingerprints.
  • This impression is made by the working roll of the rolling mill which comes into contact with the surface to be treated.
  • This cylinder itself has on its surface an engraved pattern which is, at least approximately, the "negative" of the pattern that is to be engraved on the surface of the object. It is necessary to roll without polishing, the hollows of the surface of the object are printed by corresponding reliefs formed on the cylinder, and the reliefs of the surface of the object are printed by corresponding recesses formed on the cylinder.
  • the degree of identity between the dimensions of the patterns of the cylinder and the pattern to be printed, in particular with regard to the dimensions of the reliefs / recesses of the roll, are to be determined by experience, and may vary according to the respective hardnesses of the surfaces of the roll and the surface to be treated and the intensity of the pressure applied to the surface by the cylinder.
  • the rolling mill may be of any known type, conventional to a pair of work rolls and one or more pairs of support rolls, or, for example, Sendzimir type, or a planetary type mill.
  • the cylinders are themselves etched by an industrial process such as laser engraving, electro-erosion ...
  • the figures 1 and 2 show sample surfaces of a rolled stainless steel sheet 1 with substantially smooth work rolls as is usually the case, and thus did not exhibit any particular etching.
  • the surfaces of the sheet samples themselves are relatively smooth: only shallow (about 1 to 1.5 ⁇ m) and very narrow striations, severely oriented in the rolling direction, and their analysis diagrams are visible.
  • spectral Fourier transform made by a conventional method (see, for example, the document “Engineering Techniques, The Fourier transform and its applications", 2007, AFM3, AF1440-1443), are presented.
  • the analysis is carried out taking as a reference orientation (90 °) the rolling direction
  • the analysis is carried out taking as reference orientation the cross direction, that is to say the direction perpendicular to the rolling direction.
  • the rate of isotropy between rolling direction and cross direction is, logically since it is the same sheet, identical for the two images, and it is 11.6%. This is a low rate, which is normal since no particular measure has been taken for the effect of rolling of the sheet on the structure of the surface is attenuated, this rolling being carried out in a well-defined direction.
  • This very weak isotropy of the surface is a disadvantage for the visibility of fingerprints, because it promotes the reflection of light along well-defined directions in which the fingerprint is particularly visible.
  • the striations have preferred directions of 90.0 °, 95.5 ° and 84.3 ° relative to the cross direction (the angles 0 ° and 180 ° corresponding to the two directions of the cross direction), which are therefore identical to, or very close to, the rolling direction.
  • the figures 3 and 4 have a sheet metal surface etched in a pattern not in accordance with the invention. It has reliefs according to two nested regular networks.
  • a first network oriented in the rolling direction, comprises reliefs 2 of height 45 microns, and substantially elliptical section whose base at its base, the major axis is 1.25 mm and the minor axis 0.85 mm. They are arranged in staggered rows along lines of 1.13 mm. The section of each relief gradually decreases along the height of the relief, and the vertices of two adjacent reliefs 2 located on the same line are 2 mm apart.
  • a second network oriented in the cross direction, comprises reliefs 3, interposed regularly between the reliefs 2 of the first network.
  • the reliefs 3 have a height of 30 microns and a substantially elliptical section whose base at the base, the major axis is 0.88 mm and the minor axis 0.57 mm. They are arranged in staggered rows along lines 1 mm apart. The section of each relief gradually decreases according to the height of the relief, and the vertices of two adjacent reliefs 3 located on the same line are 2.26 mm apart.
  • the spectral analysis diagram of this surface shows that its isotropy is 40.9%, which is relatively high and could be favorable from the point of view of the absence of visibility of fingerprints.
  • this diagram only shows three privileged directions, of 16 °, 89.9 ° and 160 ° with respect to the cross direction. These differences are very large, greater than the maximum of 60 ° required by the invention, and it will be seen that, in fact fingerprints remain very visible on a stainless steel surface having this etching.
  • the Figures 5 to 7 show the surfaces of isolated polygons 4 part of a pattern printed on the surface of the object, made according to the invention. As can be seen, these polygons 4 are, in the cases shown, irregular hexagons, within which rectilinear striations 5, themselves separated by ridges 6, are formed. The axes of each streak 5 are separated from each other. About 0.2 mm in the example shown, and according to the invention this distance can vary between 0.1 and 0.3 mm. The depth of the ridges 5 with respect to the peaks of the ridges 6 is, in the example shown, approximately 20 ⁇ m. According to the invention, it could be from 5 to 30 ⁇ m. The Figures 5 to 7 also show the Fourier transform spectral analysis diagrams of the corresponding isolated polygon 4
  • the figure 5 shows a polygon 4 whose axis of the striations 5 is oriented almost parallel to the rolling direction.
  • the isotropic rate between the rolling direction and the cross direction is 8.36%, and is therefore very low, reflecting a very marked orientation of the streaks as a whole.
  • the main direction is effectively in the 99.1 ° direction relative to the cross direction, a second preferred direction is in the 90 ° direction, a third preferred direction is in the 84.3 ° direction.
  • the figure 6 shows a polygon 4 identical to that of the figure 3 , the axis of the striations is oblique (about 45 °) with respect to the rolling direction.
  • the isotropy rate is 4.92%.
  • the main preferred direction is in the 130 ° direction from the cross direction, a second preferred direction is in the 136 ° direction, a third preferred direction is in the 123 ° direction.
  • the figure 7 shows another polygon 4 identical to that of the figure 3 , the axis of the grooves 5 is substantially perpendicular to the rolling direction.
  • the isotropy rate is 7.08%.
  • the main preferred direction is in the direction 0.0729 ° from the cross direction, a second preferred direction is in the direction 171 °, a third preferred direction is in the direction 166 °.
  • the figure 8 shows in perspective a portion of the surface of a sheet 1 according to the invention, the surface of which has a random juxtaposition of polygons 4 as defined above. It shows that the contours and orientations of the streaks of the different polygons 4 are very varied, so that the rate of isotropy of the surface taken as a whole should be expected to be relatively high, which is confirmed by the measures that will be seen later. It also shows that, according to a preferred variant of the invention, the polygons 4 are not all located in the same plane, and that the reference planes of two contiguous polygons are inclined by 1 to 10 ° relative to each other. to the other.
  • the figure 9 shows in plan view a portion of 400 mm 2 of the surface of a sheet 1 according to the invention, with its Fourier transform spectral analysis diagram. Measurements of the isotropic rate between rolling direction and transverse direction and preferential angular orientations are, as on the figures 1 , 2 and 3 , carried out on the whole of the represented surface, and no longer, as on the Figures 5 to 7 , on isolated polygons. The isotropy is therefore much more marked since the preferred orientations of the striations of the various polygons are very diverse: 40.3%.
  • the lines of the preferential orientations of the surface taken as a whole form a sheaf of six groups of lines, these groups having different main orientations.
  • the figure 10 shows another example of a surface of a sheet 1 according to the invention. Its isotropy is 53.3% therefore even better than for the example of the figure 7 .
  • the figure 11 shows another example of a surface of a sheet 1 according to the invention. Its isotropy is 50.2%. We see on the spectrum seven privileged orientations, of which the three principal ones are separated by 22,8 ° and 30 ° compared to their neighbor (s), as it appears from the data of the diagram.
  • the figure 12 shows another example of a surface of a sheet 1 according to the invention.
  • it has many polygons with four sides. Its isotropy is 60.5% therefore even better than those of the other examples represented on the Figures 7 to 9 .
  • the figure 13 shows the smooth reference surface 7 of a sheet of a bright annealed AISI 304 stainless steel, on which a user has left a clearly visible fingerprint.
  • the figure 14 shows, with the same magnification as the figure 13 , the surface 8 of a sheet of AISI 304 stainless steel having undergone brilliant annealing, on which a user has also left a visible fingerprint, although this surface 8 has an etching conforming to that shown on the figures 3 and 4 . It is therefore clear that any type of etching of the surface of the stainless steel sheet is not able to solve the problem of attenuating the visibility of fingerprints satisfactorily.
  • the figure 15 shows, with the same magnification as the figure 13 , the surface 9 of a stainless steel sheet of the same type as that of the figure 13 and observed under the same lighting conditions, whose surface is etched in accordance with the present invention (this is the type of etching of the figure 12 ) and on which a user has also put his finger.
  • this fingerprint is not visible as such, and is only manifested by the presence of a slightly darker area, sign of a reflection of light slightly less than on the rest of the surface sheet metal.
  • the aesthetic appearance of the surface 9, in particular its brilliance, is therefore not substantially modified for an observer who looks at a usual distance.
  • flanks of the ridges 5 are not rectilinear, but have a curved surface and / or, better, asperities. In this way, the scattering of the light emerging from the streaks 5 is more random, and this accentuates the desired effect of attenuating the visibility of fingerprints.
  • the invention can be applied to all types of stainless steels, whatever their microstructure. It is particularly interesting to use for steels that undergo a bright annealing, and on which fingerprints are most visible. But steels treated by conventional annealing, and for which a gloss of the surface is also obtained, can also advantageously benefit from the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • ing And Chemical Polishing (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP15735737.7A 2015-06-10 2015-06-10 Objet laminé en acier inoxydable et son procédé de fabrication Active EP3307452B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15735737T PL3307452T3 (pl) 2015-06-10 2015-06-10 Walcowany przedmiot ze stali nierdzewnej i sposób jego wytwarzania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2015/054390 WO2016198915A1 (fr) 2015-06-10 2015-06-10 Objet laminé en acier inoxydable et son procédé de fabrication

Publications (2)

Publication Number Publication Date
EP3307452A1 EP3307452A1 (fr) 2018-04-18
EP3307452B1 true EP3307452B1 (fr) 2019-04-10

Family

ID=53525217

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EP15735737.7A Active EP3307452B1 (fr) 2015-06-10 2015-06-10 Objet laminé en acier inoxydable et son procédé de fabrication

Country Status (12)

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US (1) US10744553B2 (ko)
EP (1) EP3307452B1 (ko)
JP (1) JP2018516759A (ko)
KR (1) KR20180017030A (ko)
CN (1) CN107771106B (ko)
CA (1) CA2988850A1 (ko)
ES (1) ES2734802T3 (ko)
MX (1) MX2017015897A (ko)
PL (1) PL3307452T3 (ko)
RU (1) RU2679021C1 (ko)
UA (1) UA119505C2 (ko)
WO (1) WO2016198915A1 (ko)

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US2277725A (en) * 1939-07-04 1942-03-31 Richard S Smith Decorating metallic surfaces
US3956915A (en) * 1975-03-25 1976-05-18 National Steel Corporation Drawing and ironing container stock and manufacturing methods
JPH01118301A (ja) 1987-10-30 1989-05-10 Kawasaki Steel Corp 耐指絞汚れ性が良好なダル仕上オーステナイトステンレス鋼板の製造方法
JPH079007A (ja) 1993-06-22 1995-01-13 Kawasaki Steel Corp 指紋が目立たないダル仕上げ金属板
JP3587180B2 (ja) 2001-06-07 2004-11-10 住友金属工業株式会社 耐汚れ性と耐食性に優れたステンレス鋼板とその製造方法。
DE10134506A1 (de) 2001-07-04 2003-01-30 Blanco Gmbh & Co Kg Verfahren zum Herstellen eines Metallblechs, Metallblech und Vorrichtung zum Aufbringen einer Oberflächenstruktur auf ein Metallblech
JP2004136344A (ja) 2002-10-18 2004-05-13 Takasago Tekko Kk 耐指紋汚染性を有するステンレス鋼板
US20050066701A1 (en) 2003-09-26 2005-03-31 Halliday James W. Method for making a metal sheet having a decorative pattern
JP2005131643A (ja) 2003-10-28 2005-05-26 Takasago Tekko Kk 微細な曲線状の凹凸を有するステンレス鋼板とその製造方法
CN101509131B (zh) 2008-02-15 2011-05-11 宝山钢铁股份有限公司 耐蚀耐指纹的表面处理剂的制备法
DE102008019768A1 (de) * 2008-04-18 2009-10-22 Hydro Aluminium Deutschland Gmbh Verfahren zur Herstellung eines Bandes für Verpackungszwecke
CA2808892C (en) 2010-08-30 2016-04-19 Ak Steel Properties, Inc. Galvanized carbon steel with stainless steel-like finish
JP5697098B2 (ja) 2010-11-29 2015-04-08 日新製鋼株式会社 指紋や汚れが目立ち難い高耐食性鋼板及びその製造方法
JP5911375B2 (ja) 2012-05-29 2016-04-27 日新製鋼株式会社 指紋や汚れが目立ち難い鋼板を用いた車両用部材
KR102138519B1 (ko) 2013-11-08 2020-07-28 엘지전자 주식회사 가전기기용 외장 패널과 그 제조장치

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Also Published As

Publication number Publication date
CA2988850A1 (fr) 2016-12-15
CN107771106B (zh) 2019-12-24
JP2018516759A (ja) 2018-06-28
US10744553B2 (en) 2020-08-18
PL3307452T3 (pl) 2019-12-31
EP3307452A1 (fr) 2018-04-18
ES2734802T3 (es) 2019-12-12
KR20180017030A (ko) 2018-02-20
MX2017015897A (es) 2018-05-07
BR112017025833A8 (pt) 2022-11-16
RU2679021C1 (ru) 2019-02-05
WO2016198915A1 (fr) 2016-12-15
CN107771106A (zh) 2018-03-06
BR112017025833A2 (pt) 2018-08-14
US20180169739A1 (en) 2018-06-21
UA119505C2 (uk) 2019-06-25

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