WO2016184891A1 - Method for producing a stainless steel sheet with modified visual characteristics - Google Patents

Method for producing a stainless steel sheet with modified visual characteristics Download PDF

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Publication number
WO2016184891A1
WO2016184891A1 PCT/EP2016/061100 EP2016061100W WO2016184891A1 WO 2016184891 A1 WO2016184891 A1 WO 2016184891A1 EP 2016061100 W EP2016061100 W EP 2016061100W WO 2016184891 A1 WO2016184891 A1 WO 2016184891A1
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WO
WIPO (PCT)
Prior art keywords
stainless steel
steel sheet
heat treatment
carried out
patterned
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.)
Ceased
Application number
PCT/EP2016/061100
Other languages
French (fr)
Inventor
Jörn TEIPEL
Dirk Wiemer
Lutz Zoppke
Patrick Vogel
Andreas Jääger
Michael Weg
Burkhard ARNOLD
Frank WÖRSTER
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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
Priority to CA2984419A priority Critical patent/CA2984419C/en
Priority to EA201792426A priority patent/EA037269B1/en
Priority to AU2016263448A priority patent/AU2016263448B2/en
Priority to CN202210997807.1A priority patent/CN115369224A/en
Priority to CN201680028385.XA priority patent/CN107636176A/en
Priority to US15/575,102 priority patent/US11155892B2/en
Priority to JP2017560321A priority patent/JP6807871B2/en
Priority to MX2017014359A priority patent/MX393802B/en
Application filed by Outokumpu Oyj filed Critical Outokumpu Oyj
Priority to KR1020177036285A priority patent/KR102575587B1/en
Priority to BR112017024675-9A priority patent/BR112017024675B1/en
Publication of WO2016184891A1 publication Critical patent/WO2016184891A1/en
Priority to ZA2017/07396A priority patent/ZA201707396B/en
Anticipated expiration legal-status Critical
Priority to US17/459,176 priority patent/US11834726B2/en
Ceased 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment 
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for producing a patterned stainless steel sheet with modified visual characteristics in the wavelength area of visible light, such as low reflectance and low glare with the inherent sparkle of the stainless steel being at least maintained.
  • the surface of a stainless steel sheet is made to have good visual characteristics.
  • the CN publication 102925649 describes a manufacture method of austenitic stainless steels with good polishing performance wherein the austenitic stainless steel is treated by carrying-out hot rolling, carrying out hot-rolling annealing, carrying out acid washing after hot- rolling annealing, carrying out cold-rolling, carrying out cold-rolling annealing, carrying out acid washing after cold-rolling annealing and refining in order to have a decorative sheet.
  • the object of the JP publication 2000144257 is to improve the gloss of a stainless steel surface.
  • the manufacture method of the JP publication 2000144257 comprises a cold rolling process of the austenitic stainless steel strip and further a bright annealing process so that the grain size of the stainless steel strip is 0,0134 - 0,027 mm. After bright annealing the strip is temper rolled and pressed, and an electrolytic polishing process is carried out for the pressed product which is further treated in order to improve the gloss of the surface by eliminating fine unevenness of the surface and achieving the smoothness and mirror polishing of the surface.
  • the JP publication 201 1 1 10594 relates to a method for manufacturing a cold- rolled ferritic stainless steel strip excellent in surface gloss.
  • the surface finish applying cold rolling, annealing or further pickling is performed by temper rolling with the rolls which are ground to the average roughness R a of 0,003 - 0,010 micrometre in the roll width direction after applying chromium plating to the surfaces of the steel rolls and thus without lubrication.
  • the KR publication 20120059970 describes a manufacturing process for ferritic stainless steel which method includes an annealing process, the following temper roll mill process, surface finishing and multi-stage shape correcting process.
  • the glossiness of the ferritic stainless steel at the light reflection angle of 60 degrees is controlled to the range of 150 - 420.
  • the multi-stage shape correcting process makes this manufacturing process more complicated and thus the manufacturing costs are high.
  • the US publication 2014017517 relates to a stainless steel plate which is manufactured by performing temper rolling using a dull roller after the finish cold rolling and bright annealing. After the last temper rolling, the plate may also be passed through degreasing and refining processes such as a tension leveler and slit to the extent that the surface properties are not affected. The total cold rolling ratio until bright annealing was set 70 % or more.
  • the stainless steel plate is applicable as exterior building material, interior building material, automotive steel plate, commercial kitchen equipment, outer plate for home appliances, outer plate for kitchen equipment and kitchen accessories, and precision equipment components and electronic device components such as computer members, digital equipment members, HDD (hard disk drive) members and solar cell substrate material.
  • the washability is improved by controlling the micro-pits that are the cause of adherence of dirt, and temper rolling is performed under conditions in which the opening and occurrence of micro-pits are restrained. Therefore, it is possible to improve the anti-glare property while maintaining washability.
  • the object of this US publication 2014017517 is thus to keep the plate as even as possible and, therefore, there are decorative structures, such as patterns, on the surface of the plate.
  • the JP patent application H06-182401 relates to a manufacturing method of a dull finishing stainless steel plate in which method after cold rolling and annealing and pickling, light rolling is carried out with a dull roll and then further annealed and pickled. Instead of annealing and pickling bright annealing can be carried out. Any patterning of the material is not described, but only an antidazzle surface.
  • the object of the present invention is to eliminate some drawbacks of the prior art and to establish a method for producing a patterned stainless steel sheet with modified visual characteristics in the wavelength area of visible light, such as low reflectance and low glare but remaining the inherent sparkle of the stainless steel and liveliness.
  • the essential features of the invention are enlisted in the appended claims.
  • the material for the method is first cold deformed, such as cold rolled, in order to have a stainless steel sheet having a desired reduction degree and thus a desired thickness range of 0,3 - 3,5 mm for further process steps.
  • the cold deformed stainless steel sheet is pretreated by at least one heat treatment step and at least one mechanical treatment step, before the stainless steel sheet is transferred into a mill for patterning.
  • After patterning operation further at least one heat treatment step is carried out for the patterned stainless steel sheet before refining the sheet for the final product having the desired surface properties with visual characteristics in the wavelength area (380 - 800 nanometre) of visible light, such as low reflectance and low glare as well as the inherent sparkle of the stainless steel.
  • the deformed stainless steel sheet is heat treated before the patterning treatment at the temperature range of 900 - 1200 °C, preferably at the temperature range of 1050 - 1200 °C.
  • the heat treatment for the deformed stainless steel sheet is carried out as an annealing and pickling step or as a bright annealing step.
  • the heat treated stainless steel sheet is further treated mechanically on at least one surface of the heat treated stainless steel sheet before the patterning operation.
  • the mechanical treatment before patterning is advantageously carried out by skin-pass rolling with a dull roll or by blasting process in order to have matt blasted surface.
  • a pattern device such as a roll
  • a smooth roll is utilized on the opposite side.
  • the emboss depth on the side of the pattern device, such as a roll is up to 100 micrometre.
  • the patterned stainless steel sheet is further heat treated at the temperature range of 900 - 1200 °C, preferably at the temperature range of 1050 - 1200 °C by carrying out the heat treatment as an annealing and pickling operation or as a bright annealing operation. After the heat treatment the patterned stainless steel sheet can be used as a final product of the method. It is also possible that the heat treated patterned stainless steel sheet is refined, such as tension levelled, in order to have for instance a desired flatness, before the sheet in accordance with the method of the invention is ready as a final product.
  • the stainless steel sheet treated according to the method of the invention shows a superior surface homogeneity and has slightly matt but sparkling on each of nuggets of the surface.
  • the surface shows a lower or equal specular reflectance than the value of less than 25 % in the prior art, because due to higher sparkling together with the homogeneity of the surface this characteristic is achieved.
  • the stainless steel sheet treated according to the method of the invention further shows a specular reflectance of less than 10 % in the visible wavelength range, but still shows a sparkling, lively appearance.
  • the skin-pass rolling for the deformed and heat treated stainless steel sheet before the patterning operation can advantageously be carried out with a textured roll.
  • the skin-pass rolling achieves a roughness R a of 0,5 - 2,5 micrometre for the surface which leads to a lower reflectance of the final product and due to the additional texture on the surface in order to increase sparkling in the final product of the method according to the invention.
  • the method for producing a patterned stainless steel sheet according to the invention is advantageously at least at intervals continuous, preferably essentially constantly continuous. Therefore, the deformed stainless steel sheet having the desired thickness can be transferred through all the process steps continuously that means lower manufacturing costs and uniform quality, such as homogeneity of the surface for the final product.
  • the stainless steel sheet to be used in the method of the invention can be austenitic stainless steel, ferritic stainless steel or ferritic austenitic stainless steel.
  • the stainless steel sheet treated in accordance with the method of the present invention is applicable as exterior building material, interior building material, automotive steel plate, commercial kitchen equipment, outer plate for home appliances, outer plate for kitchen equipment and kitchen accessories.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • ing And Chemical Polishing (AREA)

Abstract

The invention relates to a method for producing a patterned stainless steel sheet with modified visual characteristics in the wavelength area of visible light the deformed stainless steel having a thickness of 0,3 - 3,5 mm. In the method the deformed stainless steel sheet is pretreated by at least one heat treatment step and at least one mechanical treatment step on at least one surface of the heat treated stainless steel sheet. The pretreated stainless steel sheet is further transferred for patterning process, and at least one heat treatment step is carried out for the patterned stainless steel sheet surface.

Description

METHOD FOR PRODUCING A STAINLESS STEEL SHEET WITH MODIFIED VISUAL CHARACTERISTICS
The present invention relates to a method for producing a patterned stainless steel sheet with modified visual characteristics in the wavelength area of visible light, such as low reflectance and low glare with the inherent sparkle of the stainless steel being at least maintained.
It is common that the surface of a stainless steel sheet is made to have good visual characteristics. For instance the CN publication 102925649 describes a manufacture method of austenitic stainless steels with good polishing performance wherein the austenitic stainless steel is treated by carrying-out hot rolling, carrying out hot-rolling annealing, carrying out acid washing after hot- rolling annealing, carrying out cold-rolling, carrying out cold-rolling annealing, carrying out acid washing after cold-rolling annealing and refining in order to have a decorative sheet.
The object of the JP publication 2000144257 is to improve the gloss of a stainless steel surface. The manufacture method of the JP publication 2000144257 comprises a cold rolling process of the austenitic stainless steel strip and further a bright annealing process so that the grain size of the stainless steel strip is 0,0134 - 0,027 mm. After bright annealing the strip is temper rolled and pressed, and an electrolytic polishing process is carried out for the pressed product which is further treated in order to improve the gloss of the surface by eliminating fine unevenness of the surface and achieving the smoothness and mirror polishing of the surface.
The JP publication 201 1 1 10594 relates to a method for manufacturing a cold- rolled ferritic stainless steel strip excellent in surface gloss. The surface finish applying cold rolling, annealing or further pickling is performed by temper rolling with the rolls which are ground to the average roughness Ra of 0,003 - 0,010 micrometre in the roll width direction after applying chromium plating to the surfaces of the steel rolls and thus without lubrication.
In the CN publication 102925649, in the JP publication 2000144257 and in the JP publication 201 1 1 10594 a separate washing, polishing or plating process step is required in order to achieve the final product of the method.
The KR publication 20120059970 describes a manufacturing process for ferritic stainless steel which method includes an annealing process, the following temper roll mill process, surface finishing and multi-stage shape correcting process. The glossiness of the ferritic stainless steel at the light reflection angle of 60 degrees is controlled to the range of 150 - 420. The multi-stage shape correcting process makes this manufacturing process more complicated and thus the manufacturing costs are high.
The US publication 2014017517 relates to a stainless steel plate which is manufactured by performing temper rolling using a dull roller after the finish cold rolling and bright annealing. After the last temper rolling, the plate may also be passed through degreasing and refining processes such as a tension leveler and slit to the extent that the surface properties are not affected. The total cold rolling ratio until bright annealing was set 70 % or more. The stainless steel plate is applicable as exterior building material, interior building material, automotive steel plate, commercial kitchen equipment, outer plate for home appliances, outer plate for kitchen equipment and kitchen accessories, and precision equipment components and electronic device components such as computer members, digital equipment members, HDD (hard disk drive) members and solar cell substrate material. According to the US publication 2014017517 the washability is improved by controlling the micro-pits that are the cause of adherence of dirt, and temper rolling is performed under conditions in which the opening and occurrence of micro-pits are restrained. Therefore, it is possible to improve the anti-glare property while maintaining washability. The object of this US publication 2014017517 is thus to keep the plate as even as possible and, therefore, there are decorative structures, such as patterns, on the surface of the plate.
The JP patent application H06-182401 relates to a manufacturing method of a dull finishing stainless steel plate in which method after cold rolling and annealing and pickling, light rolling is carried out with a dull roll and then further annealed and pickled. Instead of annealing and pickling bright annealing can be carried out. Any patterning of the material is not described, but only an antidazzle surface.
The object of the present invention is to eliminate some drawbacks of the prior art and to establish a method for producing a patterned stainless steel sheet with modified visual characteristics in the wavelength area of visible light, such as low reflectance and low glare but remaining the inherent sparkle of the stainless steel and liveliness. The essential features of the invention are enlisted in the appended claims.
According to the present invention the material for the method is first cold deformed, such as cold rolled, in order to have a stainless steel sheet having a desired reduction degree and thus a desired thickness range of 0,3 - 3,5 mm for further process steps. The cold deformed stainless steel sheet is pretreated by at least one heat treatment step and at least one mechanical treatment step, before the stainless steel sheet is transferred into a mill for patterning. After patterning operation further at least one heat treatment step is carried out for the patterned stainless steel sheet before refining the sheet for the final product having the desired surface properties with visual characteristics in the wavelength area (380 - 800 nanometre) of visible light, such as low reflectance and low glare as well as the inherent sparkle of the stainless steel. The deformed stainless steel sheet is heat treated before the patterning treatment at the temperature range of 900 - 1200 °C, preferably at the temperature range of 1050 - 1200 °C. The heat treatment for the deformed stainless steel sheet is carried out as an annealing and pickling step or as a bright annealing step.
The heat treated stainless steel sheet is further treated mechanically on at least one surface of the heat treated stainless steel sheet before the patterning operation. The mechanical treatment before patterning is advantageously carried out by skin-pass rolling with a dull roll or by blasting process in order to have matt blasted surface. During the patterning operation, a pattern device, such as a roll, is advantageously used at least on the surface of the stainless steel sheet mechanically treated in order to carry out the patterning process of a desired design onto the surface of the stainless steel sheet. When the patterning operation is only focussed on one surface of the stainless steel sheet a smooth roll is utilized on the opposite side. The emboss depth on the side of the pattern device, such as a roll, is up to 100 micrometre.
The patterned stainless steel sheet is further heat treated at the temperature range of 900 - 1200 °C, preferably at the temperature range of 1050 - 1200 °C by carrying out the heat treatment as an annealing and pickling operation or as a bright annealing operation. After the heat treatment the patterned stainless steel sheet can be used as a final product of the method. It is also possible that the heat treated patterned stainless steel sheet is refined, such as tension levelled, in order to have for instance a desired flatness, before the sheet in accordance with the method of the invention is ready as a final product.
The stainless steel sheet treated according to the method of the invention shows a superior surface homogeneity and has slightly matt but sparkling on each of nuggets of the surface. The surface shows a lower or equal specular reflectance than the value of less than 25 % in the prior art, because due to higher sparkling together with the homogeneity of the surface this characteristic is achieved. The stainless steel sheet treated according to the method of the invention further shows a specular reflectance of less than 10 % in the visible wavelength range, but still shows a sparkling, lively appearance. These desired properties can be achieved when in connection with the heat treatment for the deformed sheet a mechanical blasting process is carried out in order to have a very matt blasted surface on which patterns are formed during the patterning process step. The skin-pass rolling for the deformed and heat treated stainless steel sheet before the patterning operation can advantageously be carried out with a textured roll. The skin-pass rolling achieves a roughness Ra of 0,5 - 2,5 micrometre for the surface which leads to a lower reflectance of the final product and due to the additional texture on the surface in order to increase sparkling in the final product of the method according to the invention.
The method for producing a patterned stainless steel sheet according to the invention is advantageously at least at intervals continuous, preferably essentially constantly continuous. Therefore, the deformed stainless steel sheet having the desired thickness can be transferred through all the process steps continuously that means lower manufacturing costs and uniform quality, such as homogeneity of the surface for the final product.
The stainless steel sheet to be used in the method of the invention can be austenitic stainless steel, ferritic stainless steel or ferritic austenitic stainless steel. The stainless steel sheet treated in accordance with the method of the present invention is applicable as exterior building material, interior building material, automotive steel plate, commercial kitchen equipment, outer plate for home appliances, outer plate for kitchen equipment and kitchen accessories.

Claims

1 Method for producing a patterned stainless steel sheet with improved visual characteristics in the wavelength area of visible light from a deformed stainless steel having a thickness of 0,3 - 3,5 mm, characterized in that in the method the deformed stainless steel sheet is pretreated by at least one heat treatment step and at least one mechanical treatment step on at least one surface of the heat treated stainless steel sheet, the pretreated stainless steel sheet is further transferred for patterning process, where the emboss depth is up to 100 micrometre, and at least one heat treatment step is carried out for the patterned stainless steel sheet. .
2. Method according to the claim 1 , characterized in that the heat treatment for the deformed stainless steel sheet is carried on at the temperature range 900 - 1200 °C, preferably at the temperature range 1 150 - 1200 °C.
3. Method according to the claim 1 or 2, characterized in that the heat treatment for the deformed stainless steel sheet is carried out as an annealing and pickling process.
4. Method according to the claim 1 or 2, characterized in that the heat treatment for the deformed stainless steel sheet is carried out as a bright annealing process.
5. Method according to any of the preceding claims, characterized in that the mechanical treatment step before the patterning process is carried out by skin- pass rolling.
6. Method according to any of the preceding claims 1 - 4, characterized in that the mechanical treatment step before the patterning process is carried out by blasting.
7. Method according to any of the preceding claims, characterized in that the patterning operation is carried out at least on the surface of the stainless steel sheet mechanically treated before patterning.
8. Method according to any of the preceding claims, characterized in that the heat treatment for the patterned stainless steel sheet is carried on at the temperature range 900 - 1200 °C, preferably at the temperature range 1 150 - 1200 °C.
9. Method according to the claim 8, characterized in that the heat treatment for the patterned stainless steel sheet is carried out as an annealing and pickling process.
10. Method according to the claim 8, characterized in that the heat treatment for the patterned stainless steel sheet is carried out as a bright annealing process.
1 1 . Method according to any of the preceding claims, characterized in that the heat treated patterned stainless steel sheet is tension levelled.
12. Method according to any of the preceding claims, characterized in that the stainless steel sheet is made of austenitic stainless steel.
13. Method according to any of the preceding claims, characterized in that the stainless steel sheet is made of ferritic stainless steel.
14. Method according to any of the preceding claims, characterized in that the stainless steel sheet is made of ferritic austenitic stainless steel.
15. Method according to any of the preceding claims, characterized in that the stainless steel sheet is applicable as exterior building material, interior building material, automotive steel plate, commercial kitchen equipment, outer plate for home appliances, outer plate for kitchen equipment and kitchen accessories.
PCT/EP2016/061100 2015-05-18 2016-05-18 Method for producing a stainless steel sheet with modified visual characteristics Ceased WO2016184891A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
JP2017560321A JP6807871B2 (en) 2015-05-18 2016-05-18 How to manufacture stainless steel sheets with modified visual properties
AU2016263448A AU2016263448B2 (en) 2015-05-18 2016-05-18 Method for producing a stainless steel sheet with modified visual characteristics
CN202210997807.1A CN115369224A (en) 2015-05-18 2016-05-18 Method for manufacturing stainless steel plate with improved visual characteristics
CN201680028385.XA CN107636176A (en) 2015-05-18 2016-05-18 Method of manufacturing stainless steel sheet with improved visual properties
US15/575,102 US11155892B2 (en) 2015-05-18 2016-05-18 Method for producing a stainless steel sheet with modified visual characteristics
MX2017014359A MX393802B (en) 2015-05-18 2016-05-18 Method for producing a stainless steel sheet with modified visual characteristics
KR1020177036285A KR102575587B1 (en) 2015-05-18 2016-05-18 Manufacturing method of stainless steel sheet with altered visual characteristics
CA2984419A CA2984419C (en) 2015-05-18 2016-05-18 Method for producing a stainless steel sheet with modified visual characteristics
EA201792426A EA037269B1 (en) 2015-05-18 2016-05-18 METHOD FOR PRODUCING STAINLESS STEEL SHEET WITH MODIFIED VISUAL CHARACTERISTICS
BR112017024675-9A BR112017024675B1 (en) 2015-05-18 2016-05-18 METHOD FOR PRODUCING A STANDARDIZED STAINLESS STEEL SHEET
ZA2017/07396A ZA201707396B (en) 2015-05-18 2017-10-31 Method for producing a stainless steel sheet with modified visual characteristics
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