EP0870848B1 - Acier au niobium et procédé de fabrication de produits plats à partir de celui-ci - Google Patents

Acier au niobium et procédé de fabrication de produits plats à partir de celui-ci Download PDF

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Publication number
EP0870848B1
EP0870848B1 EP98200844A EP98200844A EP0870848B1 EP 0870848 B1 EP0870848 B1 EP 0870848B1 EP 98200844 A EP98200844 A EP 98200844A EP 98200844 A EP98200844 A EP 98200844A EP 0870848 B1 EP0870848 B1 EP 0870848B1
Authority
EP
European Patent Office
Prior art keywords
niobium
steel
weight
proportion
steel containing
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.)
Revoked
Application number
EP98200844A
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German (de)
English (en)
French (fr)
Other versions
EP0870848A1 (fr
Inventor
Philippe Harlet
Helmut Ruhl
Firmin Beco
Heiko Reichelt
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre SA
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
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Application filed by Cockerill Sambre SA filed Critical Cockerill Sambre SA
Publication of EP0870848A1 publication Critical patent/EP0870848A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot rolling
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular fabrication or treatment of ingot or slab
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—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 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing

Definitions

  • Niobium steels of this kind have already been known for a long time (see for example EP-0101740, DE-19547181 and EP-A-0421087).
  • the titanium-free steel is a steel with an ultra-low carbon content, namely less than 0.007% by weight, in which the Nb content is very much greater than the nitrogen content, around 20 times. Nitrogen is therefore in this steel entirely fixed by nitrobutene niobium and, if boron is used, it remains free and not nitrided. Boron is intended to protect the joints of ferritic grains in order to avoid brittleness when cold deformed. This steel allows the production to obtain a sheet equivalent or close to IF steels (interstitial free) which have very high drawing coefficients r, but also a very high ⁇ r (high plane anisotropy).
  • EP-0101740 it is proposed to manufacture flat products whose Nb content is less than or equivalent to the N content. Following hot rolling at a final temperature below Ar 3 , rolling when cold and annealed, products are obtained having low mechanical strength properties, sometimes even lower than the usual minimum requirements.
  • a niobium steel is manufactured, in which the Nb content must be at least 6 times that of nitrogen.
  • the manufacturing process here also includes hot rolling at a final temperature below Ar 3 , cold rolling and annealing, as well as baking after application of varnish.
  • the final products obtained have a significantly higher niobium content, for properties of mechanical resistance that are not much improved.
  • EP-B-0400031 finally proposes, by way of comparative example, a niobium steel without titanium, having a content comprising more than 12 times the content of N. Following hot rolling at a temperature final higher than Ar 3 , cold rolling and annealing, a product is obtained which, according to the patent itself, is not suitable for deep drawing, whatever the degrees of reduction used during cold rolling.
  • Document EP-A-0 816 524 discloses a low carbon steel having a chemical composition by weight: C 0.0010-0.01%; If 0-0.2%; Mn 0.1-1.5%; P 0-0.05%; S 0-0.02%; ground. Al 0.03-0.10%; N 0-0.0040%; at least one element chosen from the group consisting of Nb 0.005-0.08% and Ti 0.01-0.07%; the remainder Fe and inevitable impurities, the contents of Nb, Ti and C having to satisfy additional conditions.
  • Document EP-A-0 822 266 discloses a low carbon steel having a chemical composition by weight: C 0-0.06%; If 0-0.03%; Mn 0.1-0.3%; P 0-0.02%; S 0.005-0.015%; ground. Al 0.01-0.10%; N 0-0.004%; B 0.0005-0.0015; O 0-0.0025%; the remainder Fe and inevitable impurities, the contents of O and S as well as B and N having to satisfy additional conditions.
  • the present invention aims to provide a niobium steel having, in terms of mechanical properties on cold-rolled and annealed strips, a favorable compromise between the strength properties, such as for example the elastic limit and the load of rupture, and the properties of ductility, such as uniform elongation, work hardening coefficient and total elongation.
  • a niobium steel as described at the start characterized in that this steel contains a niobium content greater than 0 and at most equal to four times the N content and a boron content greater than 0 and at most equal to 0.012% by weight or a zirconium content greater than 0 and at most equal to 0.080% by weight, this boron or zirconium content being sufficient to fix nitrogen not fixed by niobium.
  • This steel has the advantage of being able to have a low niobium content, and therefore of not altering the ductility properties of the steel, while obtaining an assured and preferably early fixing of the nitrogen by the simultaneous presence of boron or zirconium and niobium.
  • the niobium content is at most equal to three times this.
  • the steel contains an Nb content of less than 0.040% by weight, and preferably between 0.005 and 0.030% by weight.
  • it contains a boron content of between 0.0005 and 0.012% by weight, preferably between 0.0015 and 0.012% by weight, or also a zirconium content between 0.020 and 0.080% by weight.
  • the carbon content is equal to or greater than 0.010% by weight.
  • the amount of Nb can thus be relatively low compared to the carbon content, which makes it possible to obtain a steel with favorable mechanical properties.
  • This process offers the advantage of a secure fixation of nitrogen in the form of boron nitride or zirconium as well as in the form of niobium carbonitride, and this at a very early stage in the process.
  • the simultaneous presence of boron or zirconium and niobium also promotes a reduced size of the austenitic grain during hot rolling.
  • the niobium present is advantageously redissolved.
  • the final temperature of hot rolling is preferably equal to or less than 900 ° C. It is precisely at this temperature, that is to say between the transformation temperature ⁇ ⁇ ⁇ (Ar 3 ) and 900 ° C., that the boron nitrides and the carbon nitrides of Nb precipitate in the process according to the invention. , which fixes nitrogen.
  • the maximum temperature mentioned above is not, however, critical and should only be considered as a preferred temperature.
  • the reduction rate is of the order of 40 to 85%, preferably 55-80%.
  • the niobium steel according to the invention is usually a conventional production or electrical production steel which is cast continuously.
  • This steel must be extra soft, that is to say have an extremely low carbon content, less than 0.100% by weight, being able to reach minimum contents up to 0.020% or more.
  • the carbon content will not exceed a value of less than 0.010% by weight.
  • This steel must also be quenched with aluminum with a content of less than 0.080% by weight.
  • Nb, B and Zr are calculated mainly as a function of the nitrogen present in the steel being treated.
  • Nb added is therefore in reality much lower stoichiometrically than nitrogen.
  • Nitrogen not fixed by niobium is fixed by B or Zr, which allows an addition of Nb lower than what is usually necessary, to obtain sufficient mechanical resistance properties from a niobium steel , without titanium. This minimal addition of Nb makes it possible to simultaneously maintain good ductility properties. It also offers appreciable economic advantages given the significant cost of niobium.
  • the steel described above is poured into slabs, which are reheated in a conventional oven, for example an oven with movable beams or a pushing oven, so that they reach a core temperature greater than or equal to 1000 ° C. sufficient to re-dissolve the precipitated niobium.
  • the strip is then cooled in a controlled manner and finally wound up at a temperature of the order of 625 ° C ⁇ 125 ° C.
  • the strip After continuous pickling in conventional lines (HCl or H 2 SO 4 ), the strip is cold re-rolled, with a thickness reduction rate of between 40 and 85%.
  • the cold rolled strip is then subjected to recrystallization annealing to give it the necessary mechanical properties.
  • This annealing can be carried out in the form of a static annealing, for example in a tight or expanded coil, at a temperature of the order of 620-680 ° C, or in the form of a continuous annealing at a temperature of 680- 850 ° C. This latter annealing may or may not be combined with any covering by dipping or other methods.
  • a final rolling step is also carried out, in the form of a final work hardening, in order to eliminate the phenomena of "Lüders bands" and to ensure a good surface roughness as well as a flatness of the product.
  • Niobium steel with extremely low carbon content without boron.
  • Chemical composition (10 -3 %) VS mn Yes P S al N 2 B Nb 50 350 8 12 6 40 6.0 0 50
  • Niobium steel according to the invention with addition of boron.
  • Chemical composition (10 -3 %) VS mn Yes P S al N 2 B Nb 55 300 7 14 3 50 5.6 4.5 7
  • Niobium steel according to the invention with addition of boron.
  • Chemical composition (10 -3 %) VS mn Yes P S al N 2 B Nb 45 270 19 12 6 43 6.0 4.0 12
  • Niobium steel with an extremely low carbon content with the addition of zirconium.
  • Chemical composition (10 -3 %) VS mn Yes P S al N 2 B Nb Zr 35 200 5 9 4 47 4.9 0 10 30
  • the extra mild niobium steel, without boron and without zirconium, of Comparative Example 3 has good mechanical strength values, but its ductility properties are perfectly unsatisfactory, whereas it is generally required to be elongated. rupture greater than or equal to 32% and a work hardening coefficient greater than or equal to 0.170.
  • niobium steels according to the invention offer both mechanical strength properties much greater than the usual lower limits and good ductility properties, thus providing a compromise which is entirely favorable for subsequent treatments.
  • the niobium steels according to the invention exhibit, on cold-rolled and annealed strips, mechanical properties in the plane of the strip which are substantially independent of the direction relative to the direction of rolling as well as 'a rational contraction in width substantially identical to a rational contraction in thickness. They therefore meet all the conditions for undergoing treatments of the difficult stamping type and the like.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Catalysts (AREA)
  • Heat Treatment Of Steel (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP98200844A 1997-03-27 1998-03-18 Acier au niobium et procédé de fabrication de produits plats à partir de celui-ci Revoked EP0870848B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9700270 1997-03-27
BE9700270A BE1011066A3 (fr) 1997-03-27 1997-03-27 Acier au niobium et procede de fabrication de produits plats a partir de celui-ci.

Publications (2)

Publication Number Publication Date
EP0870848A1 EP0870848A1 (fr) 1998-10-14
EP0870848B1 true EP0870848B1 (fr) 2003-09-10

Family

ID=3890428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98200844A Revoked EP0870848B1 (fr) 1997-03-27 1998-03-18 Acier au niobium et procédé de fabrication de produits plats à partir de celui-ci

Country Status (7)

Country Link
EP (1) EP0870848B1 (da)
AT (1) ATE249528T1 (da)
BE (1) BE1011066A3 (da)
DE (1) DE69817900T2 (da)
DK (1) DK0870848T3 (da)
ES (1) ES2207787T3 (da)
PT (1) PT870848E (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2820150B1 (fr) * 2001-01-26 2003-03-28 Usinor Acier isotrope a haute resistance, procede de fabrication de toles et toles obtenues
US7365269B2 (en) 2002-10-09 2008-04-29 Prysmian Cavi E Sistemi Energia S.R.L. Method of screening the magnetic field generated by an electrical power transmission line and electrical power transmission line so screened
FR2845694B1 (fr) * 2002-10-14 2005-12-30 Usinor Procede de fabrication de toles d'acier durcissables par cuisson, toles d'acier et pieces ainsi obtenues
UA109963C2 (uk) * 2011-09-06 2015-10-26 Катана сталь, яка затвердіває внаслідок виділення часток після гарячого формування і/або загартовування в інструменті, яка має високу міцність і пластичність, та спосіб її виробництва

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0816524A1 (en) * 1996-05-07 1998-01-07 Nkk Corporation Steel sheet for excellent panel appearance and dent resistance after forming
EP0822266A1 (en) * 1996-02-08 1998-02-04 Nkk Corporation Steel sheet for two-piece battery can excellent in moldability, secondary work embrittlement resistance, and corrosion resistance

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5853708B2 (ja) * 1979-03-15 1983-11-30 住友金属工業株式会社 衝合部靭性の優れた溶接鋼管
JPS6045689B2 (ja) * 1982-02-19 1985-10-11 川崎製鉄株式会社 プレス成形性にすぐれた冷延鋼板の製造方法
JPS59123721A (ja) * 1982-12-29 1984-07-17 Kawasaki Steel Corp 加工性にすぐれた冷延鋼板の製造方法
JPS6160860A (ja) * 1984-09-03 1986-03-28 Nippon Kokan Kk <Nkk> メツキ密着性の優れた深絞り用亜鉛メツキ鋼板およびその製造方法
JPS6164852A (ja) * 1984-09-03 1986-04-03 Kawasaki Steel Corp 面内異方性の極めて少ないプレス加工用非時効性冷延鋼板
DE3803064C2 (de) * 1988-01-29 1995-04-20 Preussag Stahl Ag Kaltgewalztes Blech oder Band und Verfahren zu seiner Herstellung
EP0421087B1 (en) * 1989-08-09 1994-11-30 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. Method of manufacturing a steel sheet
JP2542536B2 (ja) * 1991-02-28 1996-10-09 新日本製鐵株式会社 塗装焼付硬化性と２次加工性に優れた深絞り用冷延鋼板の製造方法
US5360493A (en) * 1992-06-08 1994-11-01 Kawasaki Steel Corporation High-strength cold-rolled steel sheet excelling in deep drawability and method of producing the same
DE19547181C1 (de) * 1995-12-16 1996-10-10 Krupp Ag Hoesch Krupp Verfahren zur Herstellung eines kaltgewalzten, höherfesten Bandstahles mit guter Umformbarkeit bei isotropen Eigenschaften

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0822266A1 (en) * 1996-02-08 1998-02-04 Nkk Corporation Steel sheet for two-piece battery can excellent in moldability, secondary work embrittlement resistance, and corrosion resistance
EP0816524A1 (en) * 1996-05-07 1998-01-07 Nkk Corporation Steel sheet for excellent panel appearance and dent resistance after forming

Also Published As

Publication number Publication date
DE69817900D1 (de) 2003-10-16
DK0870848T3 (da) 2004-01-12
ATE249528T1 (de) 2003-09-15
BE1011066A3 (fr) 1999-04-06
EP0870848A1 (fr) 1998-10-14
DE69817900T2 (de) 2004-07-22
ES2207787T3 (es) 2004-06-01
PT870848E (pt) 2004-01-30

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