EP2986749A1 - Kaltgewalztes emailliertes stahlblech, verfahren zu dessen herstellung und verwendung solch eines stahls - Google Patents

Kaltgewalztes emailliertes stahlblech, verfahren zu dessen herstellung und verwendung solch eines stahls

Info

Publication number
EP2986749A1
EP2986749A1 EP14717774.5A EP14717774A EP2986749A1 EP 2986749 A1 EP2986749 A1 EP 2986749A1 EP 14717774 A EP14717774 A EP 14717774A EP 2986749 A1 EP2986749 A1 EP 2986749A1
Authority
EP
European Patent Office
Prior art keywords
steel sheet
sheet according
steel
max
enamelling
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.)
Granted
Application number
EP14717774.5A
Other languages
English (en)
French (fr)
Other versions
EP2986749B1 (de
Inventor
Joost Willem Hendrik Van Krevel
Ronald VAN DUIJN
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.)
Tata Steel Ijmuiden BV
Original Assignee
Tata Steel Ijmuiden BV
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 BV filed Critical Tata Steel Ijmuiden BV
Priority to EP14717774.5A priority Critical patent/EP2986749B1/de
Publication of EP2986749A1 publication Critical patent/EP2986749A1/de
Application granted granted Critical
Publication of EP2986749B1 publication Critical patent/EP2986749B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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

  • 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 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)
EP14717774.5A 2013-04-15 2014-04-15 Kaltgewalztes emailliertes stahlblech, verfahren zu seiner herstellung, und verwendung eines solchen stahls Active EP2986749B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14717774.5A EP2986749B1 (de) 2013-04-15 2014-04-15 Kaltgewalztes emailliertes stahlblech, verfahren zu seiner herstellung, und verwendung eines solchen stahls

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13001949 2013-04-15
PCT/EP2014/057601 WO2014170315A1 (en) 2013-04-15 2014-04-15 Cold reduced enamelling steel sheet, method for its production, and use of such steel
EP14717774.5A EP2986749B1 (de) 2013-04-15 2014-04-15 Kaltgewalztes emailliertes stahlblech, verfahren zu seiner herstellung, und verwendung eines solchen stahls

Publications (2)

Publication Number Publication Date
EP2986749A1 true EP2986749A1 (de) 2016-02-24
EP2986749B1 EP2986749B1 (de) 2018-03-21

Family

ID=48183994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14717774.5A Active EP2986749B1 (de) 2013-04-15 2014-04-15 Kaltgewalztes emailliertes stahlblech, verfahren zu seiner herstellung, und verwendung eines solchen stahls

Country Status (3)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023057106A1 (en) * 2021-10-08 2023-04-13 Tata Steel Ijmuiden B.V. Hot-rolled enamelling steel sheet and method for its production

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1152340A (zh) * 1995-03-27 1997-06-18 新日本制铁株式会社 具有改进疲劳性能的超低碳冷轧钢板和镀锌钢板及其生产工艺
EP1233079B1 (de) * 2001-02-16 2012-04-11 Tata Steel IJmuiden BV Kaltverformtes emailliertes Stahlblech und emaillierte Struktur mit einem Bestandteil von einem solchen Stahlblech
EP1336665B1 (de) 2002-02-18 2008-07-02 Corus Staal BV Kaltverformtes emailliertes Stahlblech und emaillierte Struktur mit einem Bestandteil von einem solchen Stahlblech

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014170315A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023057106A1 (en) * 2021-10-08 2023-04-13 Tata Steel Ijmuiden B.V. Hot-rolled enamelling steel sheet and method for its production

Also Published As

Publication number Publication date
WO2014170315A1 (en) 2014-10-23
EP2986749B1 (de) 2018-03-21
ES2667198T3 (es) 2018-05-10

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