EP4090785A1 - Procédé de fabrication d'une tôle d'acier traitée en surface et conditionnée en surface - Google Patents

Procédé de fabrication d'une tôle d'acier traitée en surface et conditionnée en surface

Info

Publication number
EP4090785A1
EP4090785A1 EP21701666.6A EP21701666A EP4090785A1 EP 4090785 A1 EP4090785 A1 EP 4090785A1 EP 21701666 A EP21701666 A EP 21701666A EP 4090785 A1 EP4090785 A1 EP 4090785A1
Authority
EP
European Patent Office
Prior art keywords
steel sheet
skin
zinc
pass
surface roughness
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.)
Pending
Application number
EP21701666.6A
Other languages
German (de)
English (en)
Inventor
Fabian JUNGE
Burak William Cetinkaya
Jennifer Schulz
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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 ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP4090785A1 publication Critical patent/EP4090785A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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
    • 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
    • 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 for producing a surface-refined and surface-conditioned steel sheet, the method comprising the following steps:
  • a standard surface conditioning process for (cold) rolled (steel) sheet is skin pass.
  • a roller with shaping elements is pressed on one side against a sheet metal or a sheet is passed between a pair of rollers with shaping elements and skinned on both sides. Due to the contact of the sheet with the skin pass roller, the negative of the roll topography is mapped onto the sheet in an idealized view.
  • the desired roughness parameters can be achieved on the sheet metal surface, and on the other hand mechanical parameters of the material can be set in a targeted manner. While the roughness generally has a decisive influence on the wettability, suitability for adhesion and reactivity of the surface, the setting of the mechanical parameters is aimed at the desired forming properties of the sheet metal.
  • skin-pass degree a measure of the percentage sheet thickness reduction due to rolling.
  • sheets are rolled / skin-passed in a hot-dip coating plant with a skin-pass degree of up to 1% in order to achieve the required mechanical parameters of the material.
  • the shaping elements of the roller which come into contact with the sheet metal, cause a mechanical deformation of the coating in hot-dip coated sheets at these contact points, which can be found on the sheet side as a skin pass impression (embossed areas). For example, with EDT-textured rolls and a skin pass degree of less than 1%, coherent impressions with an average depth of 3-6 pm and extend over a range of up to 2500 pm 2 are created .
  • the rest (unembossed areas) of the sheet metal remains free of mechanical damage or deformation.
  • the embossed areas on the surface of the sheet metal increase the chemical reactivity of the surface, whereas the unembossed areas do not have a “positive” influence on the chemical reactivity of the surface.
  • the object of the invention is to provide a method for producing a surface-refined and surface-conditioned steel sheet, with which an increase in chemical reactivity on the entire surface of the steel sheet and a surface enlargement, in particular in the nanometer range, is possible.
  • the object is achieved with the features of claim 1.
  • the inventors surprisingly found that a positive influence on the increase in the chemical reactivity of the surface can also be exerted in the unembossed areas, among other things, by skin-passing with a skin-pass degree of greater than 1% so that a second surface roughness develops in the unembossed area which differs from the first surface roughness.
  • the skin pass degree of greater than 1% in particular greater than 1.2%, preferably greater than 1.4%
  • the top layer can be influenced by up to 100 nm of the steel sheet or the coating of the steel sheet, particularly in the unembossed areas.
  • the chemical reactivity can be increased on the entire surface of the sheet and a surface enlargement, in particular in the nanometer range, can be achieved , so that not only better phosphatability and / or binding of polymeric systems is made possible, but also improved wettability and / or deformability can be guaranteed.
  • the method according to the invention it is possible to ensure a relatively high roughness on the surface of the entire sheet metal not only on a microscopic scale, but also in the nanoscale range.
  • the contact pressure of the skin-pass rollers can be increased and the surface of the surface-finished steel sheet can be deformed by the shaping elements of the skin-pass roller in such a way that the coating material and possibly the steel sheet material between the penetrating, shaping elements of the skin pass rollers is placed under great tension, so that as a result of this tension the top layer of the coating is broken up and thus ensures a change, in particular a roughening in the unembossed area in the nanoscale range.
  • unembossed areas of the surface-refined sheet steel that do not come into contact with the shaping elements of the skin-pass rollers are effectively surface-conditioned. This is noticeable in that the second surface roughness differs from the first surface roughness.
  • Sheet steel is to be understood as meaning a flat steel product in the form of a strip or sheet metal / plate. It has a longitudinal extension (length), a transverse extension (width) and a height extension (thickness).
  • the steel sheet can be a hot strip (hot-rolled steel strip) or a cold strip (cold-rolled steel strip) or a hot strip or a cold strip be made.
  • the surface of the steel sheet is preferably skin-passed by means of one or more skin-pass rollers, with areas embossed in a rolling stand in a rolling train or in a coating line, or separately in a (post) rolling stand being introduced.
  • the “first” surface roughness is to be understood as the surface of the surface-refined steel sheet provided with a zinc-based coating in the untreated, not yet surface-conditioned state. Depending on how the surface refinement is carried out, this occurs in particular on the entire surface of the surface-refined steel sheet.
  • a two- or three-dimensional profile of the surface can be measured, from which various roughness parameters are calculated using standardized methods, which characterize the surface roughness.
  • the “second” surface roughness is to be understood as the surface of the surface-refined, zinc-based coating and tempered, surface-conditioned sheet steel.
  • the “second” surface roughness is also determined in the same way as the "first” surface roughness is determined.
  • the dimensions of the embossed areas depend, inter alia, on the skin pass degree, which is for example up to 5%, in particular up to 4%, preferably up to 3%, preferably up to 2.5%, particularly preferably up to can be up to 2%, whereby the skin-pass degree expresses the ratio of the decrease in thickness (input thickness to output thickness in the roll stand) of the rolled steel sheet to the input thickness, in particular taking into account the thickness reduction.
  • the surface-refined and surface-conditioned sheet steel has a surface structure as a result of the skin passing.
  • the thickness of the steel sheet is, for example, 0.5 to 4.0 mm, in particular 0.6 to 3.0 mm, preferably 0.7 to 2.5 mm.
  • the second surface roughness in the unembossed area of the surface-refined and surface-conditioned steel sheet is rougher or greater than the first surface roughness of the surface-refined steel sheet provided for skin-passing.
  • the surface roughness preferably increases due to the surface breaking up as a result of the induced voltage in the unembossed area between the penetrating shaping elements of the skin pass rollers.
  • the second surface roughness is, for example, at least 10% rougher or greater, in particular at least 25% rougher or greater, preferably at least 40% rougher or greater, preferably at least 60% rougher or greater than the first surface roughness, in particular based on a scan area of 10x10 pm 2 with an atomic force microscope.
  • the increase or increase in the surface roughness relates to an increase in the developed interface ratio, i.e. the percentage of the additional area of the definition area, for example the scan area, which can be traced back to the texture, compared to the absolutely flat definition area.
  • the second surface roughness is particularly preferably at least twice as rough or large as the first surface roughness.
  • the zinc-based coating has the following chemical composition in% by weight: optionally one or more alloy elements from the group (Al, Mg):
  • the zinc-based coating can contain additional elements such as aluminum with a content of up to 5.0% by weight and / or magnesium with a content of up to 5.0% by weight.
  • Steel sheets with a zinc-based coating have very good cathodic corrosion protection, which has been used in automotive engineering for years. If improved corrosion protection is provided, the coating additionally has magnesium with a content of at least 0.05% by weight, in particular of at least 0.3% by weight, preferably of at least 0.5% by weight.
  • Aluminum can alternatively or in addition to magnesium with a content of at least 0.05% by weight, in particular of at least 0.3% by weight, preferably of at least 0.5% by weight.
  • the zinc-based coating particularly preferably has aluminum and magnesium in each case at least 0.5% by weight.
  • aluminum and magnesium oxides in particular a magnesium-rich oxide layer, form on the surface of the coating or near the surface.
  • Oxide layers can essentially have a negative effect on the wetting behavior, with magnesium oxides having a poorer wetting behavior in comparison with aluminum oxides.
  • the induced voltage can break up the oxide layer on the surface of the coating in the unembossed areas, thus leading to an increase in the surface area and thus to an increase in chemical reactivity.
  • new types of (aluminum) oxides can form beneath the broken oxide layer, which have an improved wetting behavior compared to the original (magnesium) oxide.
  • the zinc-based coating has a thickness between 2 and 20 ⁇ m, in particular between 4 and 15 ⁇ m, preferably between 5 and 12 ⁇ m.
  • a deterministic surface structure is introduced into the surface-refined steel sheet by the skin-pass molding.
  • a deterministic surface structure is to be understood in particular as regularly recurring surface structures which have a defined shape and / or configuration or dimensioning.
  • this also includes surface structures with a (guasi) stochastic appearance, which are composed of stochastic form elements with a recurring structure.
  • a stochastic surface structure into the surface-finished steel sheet.
  • the surface-finished and surface-conditioned sheet steel is phosphated.
  • an improved phosphatability can be achieved.
  • the roughening of the top layer in the unembossed areas for example in the case of zinc phosphating, means that the zinc ions are better absorbed into the Enter phosphating bath and can form a conversion chemistry, so that an essentially homogeneous formation of the phosphate layer can take place, which can meet the high requirements of the automobile manufacturer.
  • Figure la, b, c) schematic partial sectional views of a provided, surface-refined steel sheet before skin pass a) and in each case during skin pass conventional b) and according to the invention c),
  • Figure 3a, b) each shows a diagram for evaluating the fracture surface a) and the tensile shear strength b).
  • FIG. 1 shows schematic partial sectional views at specific times.
  • the surface-finished steel sheet (10) comprises a steel sheet (1) with a zinc-based coating (1.1) with a first surface roughness (1.2).
  • the zinc-based coating (1.1) can optionally also contain one or more alloying elements from the group (Al, Mg): Al up to 5.0, Mg up to 5.0.
  • the thickness of the steel sheet (1) is, for example, 0.5 to 4.0 mm.
  • FIG. 1b) shows a schematic partial sectional view during conventional skin-passing with a skin-pass degree of up to 1%.
  • the shaping elements (2.1) of a skin-pass roller penetrate only very close to the surface due to the selected skin-pass degree, so that the unembossed areas between the embossed areas do not experience any change on the surface and the first surface roughness (1.2) in the unembossed areas in the conventional skin pass essentially remain.
  • the surface behaves differently in the unembossed areas during skin-pass processing according to an embodiment of the method according to the invention, FIG.
  • the unembossed area experiences a tension which in turn leads to the top layer (s) of the coating (1.1) breaking open and thereby the Surface changes, which has a second surface roughness (1.3) which differs from the first surface roughness (1.2), is preferably rougher or greater than the first surface roughness (1.2).
  • FIG. 2 each shows a perspective image, which has been taken by means of confocal microscopy, of a portion of a surface-refined and surface-conditioned steel sheet (11), which is conventional, see FIG. 2a), and according to an embodiment of the method according to the invention, see FIG. 2b), have been manufactured.
  • a steel sheet (1) made of a soft steel grade “CR4” was cold-rolled to a thickness of 0.7 mm and coated with a zinc-based coating (1.1) in a hot-dip coating plant, with Al with 1.6% by weight in the coating (1.1) and Mg was contained at 1.1% by weight.
  • the surface-refined steel sheet (10) was conventionally skin-passed with an EDT-textured skin-pass roller (2) with a skin-pass degree of 0.95%. Samples were taken from the tempered steel sheet. The result showed that the unembossed areas on the surface of the surface-finished and surface-conditioned steel sheet showed no change compared to the surface-finished steel sheet (10) before skin passing, see Fig. 2a), enlarged illustration below.
  • a change in the unembossed areas on the surface of the surface-refined and surface-conditioned steel sheet (11) could be brought about by the surface Surface-refined sheet steel (10) with the same EDT-textured skin-pass roller (2) as in FIG. 2a), but with a skin-pass degree greater than 1%, in this case 1.5%.
  • Fig. 2b enlarged illustration below, it can be clearly seen that the tension on the surface in the unembossed areas during skin-passaging resulted in a roughening and thus a second surface roughness was created in the unembossed areas, which differs from the first The surface roughness of the untreated sheet steel (10) is different.
  • the differently produced steel sheets were phosphated and the steel sheet (11) produced according to the invention had a more homogeneous phosphate pattern with uniform zinc-phosphate crystal growth compared to the conventionally produced steel sheet.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une tôle d'acier traitée en surface et conditionnée en surface (11), ledit procédé comprenant les étapes suivantes consistant à : fournir une tôle d'acier (1) pourvue d'un revêtement à base de zinc (1.1) qui présente un premier degré de rugosité de surface (1.2), et - soumettre à un laminage par écrouissage superficiel la tôle d'acier traitée en surface (10) de telle sorte que des régions comprimées et des régions non comprimées sont formées sur la surface de la tôle d'acier (1) pourvue d'un revêtement à base de zinc (1.1). Selon l'invention, l'étape de laminage par écrouissage superficiel est réalisée avec un degré d'écrouissage superficiel supérieur à 1 % de sorte qu'un second degré de rugosité de surface (1.3) qui diffère du premier degré de rugosité de surface (1,2) est formé dans la région non comprimée.
EP21701666.6A 2020-01-13 2021-01-08 Procédé de fabrication d'une tôle d'acier traitée en surface et conditionnée en surface Pending EP4090785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020200321.1A DE102020200321A1 (de) 2020-01-13 2020-01-13 Verfahren zur Herstellung eines oberflächenveredelten und oberflächenkonditionierten Stahlblechs
PCT/EP2021/050210 WO2021144192A1 (fr) 2020-01-13 2021-01-08 Procédé de fabrication d'une tôle d'acier traitée en surface et conditionnée en surface

Publications (1)

Publication Number Publication Date
EP4090785A1 true EP4090785A1 (fr) 2022-11-23

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Family Applications (1)

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EP21701666.6A Pending EP4090785A1 (fr) 2020-01-13 2021-01-08 Procédé de fabrication d'une tôle d'acier traitée en surface et conditionnée en surface

Country Status (3)

Country Link
EP (1) EP4090785A1 (fr)
DE (1) DE102020200321A1 (fr)
WO (1) WO2021144192A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021119589A1 (de) * 2021-07-28 2023-02-02 Thyssenkrupp Steel Europe Ag Metallblech mit einer deterministischen Oberflächenstruktur
DE102022114928A1 (de) 2022-06-14 2023-12-14 Thyssenkrupp Steel Europe Ag Verfahren zum Dressieren eines schmelztauchbeschichteten Stahlblechs und entsprechend dressiertes, schmelztauchbeschichtetes Stahlblech
DE102022114930A1 (de) * 2022-06-14 2023-12-14 Thyssenkrupp Steel Europe Ag Dressiertes, schmelztauchbeschichtetes Stahlblech
DE102022127491A1 (de) * 2022-10-19 2024-04-25 Thyssenkrupp Steel Europe Ag Dressiertes Stahlblech mit intakter Oxidschicht auf einem metallischen Überzug

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JPH02175004A (ja) * 1988-12-26 1990-07-06 Kawasaki Steel Corp 鮮映性とプレス成形性に優れた溶融亜鉛めっき鋼板の製造方法
JPH0675728B2 (ja) * 1988-12-27 1994-09-28 川崎製鉄株式会社 鮮映性に優れた表面処理鋼板の製造法
ATE477065T1 (de) 2007-06-22 2010-08-15 Thyssenkrupp Steel Europe Ag Flachprodukt aus einem metallwerkstoff, insbesondere einem stahlwerkstoff, verwendung eines solchen flachprodukts sowie walze und verfahren zur herstellung solcher flachprodukte
DE102012017703A1 (de) 2012-09-07 2014-03-13 Daetwyler Graphics Ag Flachprodukt aus Metallwerkstoff, insbesondere einem Stahlwerkstoff, Verwendung eines solchen Flachprodukts sowie Walze und Verfahren zur Herstellung solcher Flachprodukte
KR101677390B1 (ko) * 2015-09-23 2016-11-18 주식회사 포스코 표면품질 및 프레스 성형성이 우수한 도금강판의 제조방법 및 이에 의해 제조된 도금강판
WO2019175370A1 (fr) * 2018-03-16 2019-09-19 Tata Steel Nederland Technology B.V. Substrat métallique pourvu de textures de surface personnalisées et procédé d'application de telles textures sur des substrats métalliques

Also Published As

Publication number Publication date
WO2021144192A1 (fr) 2021-07-22
DE102020200321A1 (de) 2021-07-15

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