WO2014170315A1 - Tôle d'acier pour émaillage réduite à froid, procédé pour sa production et utilisation d'un tel acier - Google Patents

Tôle d'acier pour émaillage réduite à froid, procédé pour sa production et utilisation d'un tel acier Download PDF

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Publication number
WO2014170315A1
WO2014170315A1 PCT/EP2014/057601 EP2014057601W WO2014170315A1 WO 2014170315 A1 WO2014170315 A1 WO 2014170315A1 EP 2014057601 W EP2014057601 W EP 2014057601W WO 2014170315 A1 WO2014170315 A1 WO 2014170315A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel sheet
sheet according
max
steel
enamelling
Prior art date
Application number
PCT/EP2014/057601
Other languages
English (en)
Inventor
Joost Willem Hendrik Van Krevel
Ronald VAN DUIJN
Original Assignee
Tata Steel Ijmuiden B.V.
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 Tata Steel Ijmuiden B.V. filed Critical Tata Steel Ijmuiden B.V.
Priority to ES14717774.5T priority Critical patent/ES2667198T3/es
Priority to EP14717774.5A priority patent/EP2986749B1/fr
Publication of WO2014170315A1 publication Critical patent/WO2014170315A1/fr

Links

Classifications

    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation 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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment

Definitions

  • the invention relates to cold reduced vitreous enamelling steel sheet.
  • the invention also relates to a method for producing an enamelled steel sheet and the use of such a steel sheet.
  • Cold reduced enamelling steel sheet is frequently used to fabricate products such as domestic appliances. During fabrication of such products, the steel sheet material is usually coated with an enamel layer. It is then desirable to obtain an enamel layer with good adhesion to the steel sheet, and with at most only a few visible defects such as fish scaling patterns. It is known that the resistance to fish scaling formation can be improved by a synergistic effect of boron and nitrogen content in cold reduced steel sheet.
  • Such an enamelling steel sheet is for instance known from EP 1336665.
  • the cold reduced enamelling steel sheet according to this document comprises (in weight ppm unless otherwise indicated)
  • Al as ⁇ 300 (acid soluble Al);
  • the balance being Fe and unintentional and/or inevitable impurities.
  • the sheet After applying and firing (white) enamel, the sheet is essentially free from fish scaling defects, and the enamel adhesion is satisfactory, if necessary by applying proper surface pretreatment and/or pretreatment layers.
  • a cold reduced enamelling steel sheet comprising (in weight ppm unless otherwise indicated)
  • Al as ⁇ 300 (acid soluble Al);
  • the steel sheet has a thickness between 0.10 mm and 0.36 mm.
  • gauges thinner than the gauges possible so far can be used by using a continuous annealing process instead of the batch annealing process used so far. It has been common practice to batch anneal full hard enamelling steel for several days at a temperature between 620 and 680 °C. However, gauges thinner than 0.4 mm could not be used due to the appearance of fish scaling defects due to insufficient hydrogen retention. The inventors have found that continuous annealing improves the hydrogen retention of the steel. Using continuous annealing thus makes it possible to produce cold reduced enamelling steel sheet having gauges between 0.10 and 0.36 mm.
  • the steel sheet has a thickness between 0.12 and 0.34 mm, preferably between 0.15 mm and 0.32 mm, more preferably between 0.20 mm and 0.30 mm.
  • the steel has a maximal hardness of 85 - 130 micro Vickers with a load of 500 gram.
  • the micro Vickers hardness is measured using a diamond tip which is pressed into the steel with a load of 500 gram.
  • the hardness of the steel is thus such that that the steel has a good resistance against indentation, while the formability is satisfactory and strain build up during coil to coil enamelling is minimal.
  • the value for B max Nx 10.8/14 + 83/6.
  • the mechanical properties are particularly optimised for relatively high Si content, i.e. in the range of 40 weight-ppm to 190 weight-ppm.
  • B min NxO.90x 10.8/14.
  • B/N the atomic ratio
  • B m jn Nx 1.00x 10.8/14.
  • the atomic ratio B/N is higher than 1.00. It has been found that a small excess of B can be tolerated regarding the mechanical properties, with the advantage that it ensures that all N is indeed precipitated. Herewith the formation of fish scales is essentially fully suppressed.
  • the steel sheet comprises: 45 ⁇ N ⁇ 110.
  • the formation of fish scale defects has been found to be suppressed better if the amount of N present in the steel sheet is at least 45 ppm.
  • B max Nx 1.20x 10.8/14.
  • the maximum amount of C in the steel sheet is 50 ppm by weight.
  • the ageing properties are better suited.
  • the maximum amount of C is 40 ppm.
  • the amount of C in the steel sheet is lower than 30 ppm by weight.
  • the strengthening of the steel sheet by ageing is maximised while no carbon boiling occurs during enamelling at 800 - 830° C.
  • the steel sheet as described above has a grain size according to ASTM of 11 units or less.
  • ASTM standard for Standard for Standardization
  • the yield strength is between 140 MPa and 300 MPa
  • the tensile strength is between 270 MPa and 450 MPa
  • the elongation to fracture is at least 30 %, all numbers measured in cross sectional direction to rolling in annealed, unaged and 1 % temper rolled condition.
  • a method for producing an enamelling steel sheet according to the first aspect of the invention wherein the steel sheet after hot rolling and cold rolling is continuous annealed at a temperature of at most 780° C.
  • the continuous annealing is performed at a temperature between 620 and 720° C. Below 550° C the steel is too hard for efficient (coil to coil) processing.
  • the use of the enamelling steel sheet according to the first aspect of the invention is provided for the production of whiteboards and/or solar cell substrates and/or flat enamelled building panels. It has been found that the thinner gauges that can be produced according to the invention are very suitable for whiteboards, solar cell substrates and flat enamelled building panels. For these purposed, the steel sheet has not to be deformed or deep drawn.
  • Cold reduced enamelling steel sheet can be produced by preparing a suitable steel melt and casting the melt into a slab.
  • the production process can include operations of hot rolling the slab, pickling the rolled product, cold rolling, annealing, and temper rolling.
  • Table 1 For the trial use is made of three coils having the composition according to Table 1.
  • Table 2 The average tensile properties for thee coils are given in Table 2.
  • Table 3 shows the picklability and fish scale sensitivity.
  • Table 2 tensile properties of thin gauge enamelling steel (average values of different samples measured over the coil)
  • the coils have been produced in a continuous caster, then hot rolled, pickled, cold rolled and continuous annealed. Continuous annealing has been performed at a maximal average temperature of 680° C. Thereafter, temper rolling has been performed with a reduction of 1.2%.
  • the thickness of the enamelling steel strip thus produced is 0.285-0.305 mm
  • the hardness measured is 90-1 10 in (micro) Vickers hardness. No fish scaling defects are observed during vitreous enamel application tests using special fish scale sensitive vitreous enamel according to the procedure described in norm EN 10206.
  • the grain size is found to be 9.5 units according to ASTM.
  • the grain size is found to be 10.5 units according to ASTM.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

L'invention porte sur une tôle d'acier pour émaillage réduite à froid, comprenant (en ppm en poids sauf indication contraire) : 5≤C≤90 ; 0,10≤Mn≤0,50 (% en poids) ; Alas≤300 (Al soluble en milieu acide) ; O≤35 ; S≤350 ; 30≤N≤110 ; Bmin<B≤Bmax, où Bmin=Nx0,80x10,8/14 et Bmax=Nx10,8/14+144/6 ; 50≤P≤160 ; en association avec Cumin≤Cu≤Cumax, où Cumin=Px1,00x63,6/31 et Cumax = Px2,00x63,6/31 ; et éventuellement Si≤190 ; le reste étant du Fe et des impuretés involontaires et/ou inévitables, la tôle d'acier ayant été recuite en continu et la tôle d'acier ayant une épaisseur comprise entre 0,10 mm et 0,36 mm. L'invention porte également sur un procédé pour la production d'un tel acier et sur l'utilisation d'un tel acier.
PCT/EP2014/057601 2013-04-15 2014-04-15 Tôle d'acier pour émaillage réduite à froid, procédé pour sa production et utilisation d'un tel acier WO2014170315A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES14717774.5T ES2667198T3 (es) 2013-04-15 2014-04-15 Chapa de acero esmaltado reducido en frío, método para su producción y uso de dicho acero
EP14717774.5A EP2986749B1 (fr) 2013-04-15 2014-04-15 Feuille d'acier à émaillage réduit à froid, son procédé de production et utilisation d'un tel acier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13001949.0 2013-04-15
EP13001949 2013-04-15

Publications (1)

Publication Number Publication Date
WO2014170315A1 true WO2014170315A1 (fr) 2014-10-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/057601 WO2014170315A1 (fr) 2013-04-15 2014-04-15 Tôle d'acier pour émaillage réduite à froid, procédé pour sa production et utilisation d'un tel acier

Country Status (3)

Country Link
EP (1) EP2986749B1 (fr)
ES (1) ES2667198T3 (fr)
WO (1) WO2014170315A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023057106A1 (fr) 2021-10-08 2023-04-13 Tata Steel Ijmuiden B.V. Tôle d'acier pour émaillage laminée à chaud et son procédé de production

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5855696A (en) * 1995-03-27 1999-01-05 Nippon Steel Corporation Ultra low carbon, cold rolled steel sheet and galvanized steel sheet having improved fatigue properties and processes for producing the same
EP1233079A1 (fr) * 2001-02-16 2002-08-21 Corus Staal BV Tôle en acier émaillé formé à froid et structure émaillée contenant un composant d'une tôle d'acier
EP1336665A1 (fr) 2002-02-18 2003-08-20 Corus Staal BV Tôle en acier émaillé formé à froid et structure émaillée contenant un composant d' une tôle d' acier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5855696A (en) * 1995-03-27 1999-01-05 Nippon Steel Corporation Ultra low carbon, cold rolled steel sheet and galvanized steel sheet having improved fatigue properties and processes for producing the same
EP1233079A1 (fr) * 2001-02-16 2002-08-21 Corus Staal BV Tôle en acier émaillé formé à froid et structure émaillée contenant un composant d'une tôle d'acier
EP1336665A1 (fr) 2002-02-18 2003-08-20 Corus Staal BV Tôle en acier émaillé formé à froid et structure émaillée contenant un composant d' une tôle d' acier

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JARED L. SOMMER: "Low-Cost Enamel Coatings on Stainless Steel Foil for Thin Film Photovoltaics", 31 December 2002 (2002-12-31), XP002711938, Retrieved from the Internet <URL:http://www.sbir.gov/sbirsearch/detail/311030> [retrieved on 20130829] *
WIKIPEDIA: "Whiteboard - History", 26 August 2013 (2013-08-26), XP002711937, Retrieved from the Internet <URL:http://en.wikipedia.org/wiki/Whiteboard> [retrieved on 20130829] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023057106A1 (fr) 2021-10-08 2023-04-13 Tata Steel Ijmuiden B.V. Tôle d'acier pour émaillage laminée à chaud et son procédé de production

Also Published As

Publication number Publication date
ES2667198T3 (es) 2018-05-10
EP2986749A1 (fr) 2016-02-24
EP2986749B1 (fr) 2018-03-21

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