EP2986749B1 - Feuille d'acier à émaillage réduit à froid, son procédé de production et utilisation d'un tel acier - Google Patents

Feuille d'acier à émaillage réduit à froid, son procédé de production et utilisation d'un tel acier Download PDF

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Publication number
EP2986749B1
EP2986749B1 EP14717774.5A EP14717774A EP2986749B1 EP 2986749 B1 EP2986749 B1 EP 2986749B1 EP 14717774 A EP14717774 A EP 14717774A EP 2986749 B1 EP2986749 B1 EP 2986749B1
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EP
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Prior art keywords
steel sheet
sheet according
max
steel
enamelling
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EP14717774.5A
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German (de)
English (en)
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EP2986749A1 (fr
Inventor
Joost Willem Hendrik Van Krevel
Ronald VAN DUIJN
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Tata Steel Ijmuiden BV
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Tata Steel Ijmuiden BV
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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 EP1233079 and EP 1336665 .
  • the cold reduced enamelling steel sheet according to EP1336665 comprises (in weight ppm unless otherwise indicated) 5 ⁇ C ⁇ 90 ; 0.10 ⁇ Mn ⁇ 0.50 wt .
  • 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.
  • 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 0.34 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 N ⁇ 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 Nx0.90x 10.8/14.
  • B/N the atomic ratio
  • B min N ⁇ 1.00 ⁇ 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.
  • the steel sheet comprises less than 89 ppm N. It has been found that the amount of added B can then be reduced while the formation of fish scale defects is nevertheless sufficiently reduced.
  • the steel sheet comprises less than 89 ppm N
  • B max N ⁇ 1.20 ⁇ 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, wherein the steel sheet is rolled to a thickness between 0.10 mm and 0.34 mm, is continuous annealed at a temperature of at most 780° C.
  • the hydrogen retention of the steel is improved. Due to this improved hydrogen retention, fish scaling defects are avoided.
  • 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.
  • For the trial use is made of three coils having the composition according to Table 1. The average tensile properties for thee coils are given in Table 2.
  • Table 3 shows the picklability and fish scale sensitivity.
  • Table 1 all elements in ppm, Mn in mwt.% C Mn O Al Al as B N B/N Si Cu P S Coil 1 16 298 0 20 190 69 81 0.85 30 220 70 160 Coil 2 16 298 0 20 190 69 81 0.85 30 220 70 160 Coil 3 35 302 0 22 220 67 86 0.78 30 240 80 160
  • Table 3 Picklability and fish scale sensitivity Picklability Fishscale sensitive* Coil 1 OK N Coil 2 OK N Coil 3 OK N * test criteria according to norm EN 10209.
  • 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 90-110 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)

Claims (14)

  1. Tôles d'acier pour émaillage réduite à froid (en ppm de poids sauf indication contraire) 5 ≤ C ≤ 90 ;
    Figure imgb0050
     0,10 ≤ Mn ≤ 0,50 % en poids ;
    Figure imgb0051
     Al as ≤ 300 Al soluble en milieu acide ;
    Figure imgb0052
     O ≤ 35 ;
    Figure imgb0053
     S ≤ 350 ;
    Figure imgb0054
     30 ≤ N ≤ 110 ;
    Figure imgb0055
     B min < B ≤ B max ;
    Figure imgb0056
     où B min = N × 0,80 × 10,8 / 14 et B max = N × 10,8 / 14 + 144 / 6 ;
    Figure imgb0057
     50 ≤ P ≤ 160 ;
    Figure imgb0058
     en association avec Cu min ≤ Cu ≤ Cu max ;
    Figure imgb0059
     où Cu min = P × 1,00 × 63,6 / 31 et Cu max = P × 2,00 × 63,6 / 31 ;
    Figure imgb0060
     et éventuellement Si < 190 ;
    Figure imgb0061
     le reste étant constitué de Fe et d'impuretés inévitables,
    ladite tôle d'acier ayant été recuite en continu, et
    ladite tôle d'acier possédant une épaisseur comprise entre 0,10 mm et 0,34 mm.
  2. Tôle d'acier selon la revendication 1, ladite tôle d'acier possédant une épaisseur comprise entre 0,12 et 0,34 mm, de préférence entre 0,15 et 0,32 mm, idéalement entre 0,20 et 0,30 mm.
  3. Tôle d'acier selon la revendication 1 ou 2, ledit acier possédant une dureté maximale de 85 à 130 microvickers avec une charge de 500 grammes.
  4. Tôle d'acier selon l'une quelconque des revendications précédentes, où Bmax = N×10,8/14 + 83/6.
  5. Tôle d'acier selon l'une quelconque des revendications précédentes, où Bmin = N×0,90×10,8/14 et de préférence Bmin = N×1,00×10,8/14.
  6. Tôle d'acier selon l'une quelconque des revendications précédentes, où 45 ≤ N ≤ 110 ou 30 ≤ N ≤ 89.
  7. Tôle d'acier selon la revendication 6, où Bmax = N×1,20×10,8/14.
  8. Tôle d'acier selon l'une quelconque des revendications précédentes, où Cumax = P×1,50×63,6/31.
  9. Tôle d'acier selon l'une quelconque des revendications précédentes, ladite quantité maximum de C étant de 30 ppm en poids.
  10. Tôle d'acier selon l'une quelconque des revendications précédentes, ladite taille de grain selon la norme ASTM étant inférieure ou égale à 11 unités.
  11. Tôle d'acier selon l'une quelconque des revendications précédentes, ladite limite d'élasticité étant comprise entre 140 MPa et 300 MPa, ladite résistance à la traction étant comprise entre 270 MPa et 450 MPa, et ledit allongement à la rupture étant supérieur ou égal à 30 %.
  12. Procédé destiné à la production d'une tôle d'acier pour émaillage selon l'une quelconque des revendications précédentes, ladite tôle d'acier après laminage à chaud et laminage à froid, ladite tôle d'acier étant laminée jusqu'à une épaisseur comprise entre 0,10 et 0,34 mm, étant recuite en continu à une température inférieure ou égale à 780°C.
  13. Procédé selon la revendication 12, ledit recuit en continu étant effectué à une température comprise entre 620 et 720°C.
  14. Utilisation de la tôle d'acier pour émaillage selon l'une quelconque des revendications 1 à 11 pour la production des tableaux blancs et/ou des substrats de cellule solaire et/ou des panneaux de construction émaillés plats.
EP14717774.5A 2013-04-15 2014-04-15 Feuille d'acier à émaillage réduit à froid, son procédé de production et utilisation d'un tel acier Active EP2986749B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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 (3)

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

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EP2986749A1 EP2986749A1 (fr) 2016-02-24
EP2986749B1 true EP2986749B1 (fr) 2018-03-21

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EP (1) EP2986749B1 (fr)
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WO (1) WO2014170315A1 (fr)

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* 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

Family Cites Families (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
ES2383168T3 (es) * 2001-02-16 2012-06-18 Tata Steel Ijmuiden Bv Chapa delgada de acero esmaltado, reducido en frío, y una estructura esmaltada que comprende un componente de una chapa delgada de acero parecida
EP1336665B1 (fr) 2002-02-18 2008-07-02 Corus Staal BV Tôle en acier émaillé formé à froid et structure émaillée contenant un composant d' une tôle d' acier

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WO2014170315A1 (fr) 2014-10-23
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