EP1083241A1 - Ferritisches Niobium-stabilisiertes 14% Chrom-stahl und dessen Verwendung in Kraftfahrzeugen - Google Patents

Ferritisches Niobium-stabilisiertes 14% Chrom-stahl und dessen Verwendung in Kraftfahrzeugen Download PDF

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Publication number
EP1083241A1
EP1083241A1 EP00402447A EP00402447A EP1083241A1 EP 1083241 A1 EP1083241 A1 EP 1083241A1 EP 00402447 A EP00402447 A EP 00402447A EP 00402447 A EP00402447 A EP 00402447A EP 1083241 A1 EP1083241 A1 EP 1083241A1
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EP
European Patent Office
Prior art keywords
niobium
steel sheet
relationship
δnb
temperature
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
EP00402447A
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English (en)
French (fr)
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EP1083241B1 (de
Inventor
Silke Liesert
Laurent Antoni
Pierre Olivier Santacreu
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.)
Aperam Stainless France SA
Original Assignee
Ugine SA
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Publication of EP1083241A1 publication Critical patent/EP1083241A1/de
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Publication of EP1083241B1 publication Critical patent/EP1083241B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot 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
    • C21D8/0221—Modifying the physical properties 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 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

Definitions

  • the invention relates to a ferritic steel said to have 14% chromium. stabilized with niobium and its use in the automotive field.
  • the steels used for these hot parts are often relatively austenitic steels expensive and with low resistance to oxidation, but having good shaping characteristics, ie bistabilised ferritic steels. Bistabilized ferritic steels have good resistance to oxidation but are relatively difficult to format.
  • the aim of the invention is to propose a ferritic steel, economical, which has very good heat resistance both to creep and oxidation, up to 1000 ° C and an improved hardness characteristic for its shaping.
  • the invention also relates to a use of sheet steel ferritic in the automotive field and in particular for the realization of exhaust line collector.
  • FIGS. 1A and 1B respectively present a microstructure of a steel according to the invention, referenced 1 in Tables I and II, and a microstructure of a comparison steel, referenced 6 in Tables I and II, after heat treatment, each of the two steels having the same ⁇ Nb of about 0.25%.
  • Figure 2 shows a microstructure of a comparison steel referenced 9 in Tables I and II, with a relatively high ⁇ Nb about 0.43% having, after heat treatment, precipitates intergranular Fe2Nb type, distributed in a disordered manner.
  • Figure 3 shows the mechanical hardness characteristics for a steel according to the invention, referenced 1 in Tables I and II, and two comparison steels, referenced 6 and 9 in Tables I and II, before and after heat treatment to form precipitates respectively Fe2Nb3 or Fe2Nb type.
  • the Laves phase Fe2Nb For a value of ⁇ Nb ⁇ 0.3%, the Laves Fe2Nb phase is completely dissolved at temperatures equal to or above 950 ° C, as shown in Figure 1 B. This explains the bad behavior of these steels to the creep behavior at or beyond 950 ° C.
  • This phase has a lower solubility than the Laves Fe2Nb phase.
  • the presence of the Fe2Nb3 phase at high temperature, in large quantity has the advantage of generating a very good creep resistance and shaping of the steels according to the invention.
  • the Laves Fe2Nb phase is an intermetallic compound, which, when it exists in a steel, precipitates intragranularly and at the joints of grains in an anarchic way and does not prevent sufficiently the displacement of grain boundaries, so the material flows. An amount significant of this intermetallic precipitate is necessary to improve the creep resistance.
  • the Si / Mn ratio greater than 1 is not respected, it is also the intermetallic Fe2Nb3 which appears.
  • Manganese increases the solubility of the intermetallic Fe2Nb3 and the formation, at high temperature, of a CrNbN type Z phase in the grains. At 950 ° C, the intermetallic Fe2Nb3 is thus dissolved. Steel has a bad creep and oxidation resistance. Silicon compensates for this effect.
  • heat treatment at a temperature of the order of 900 ° C, preferably of the order of 850 ° C, for a relatively short period, less than or equal to 30 min, after final annealing or prior to use has been carried out.
  • the treatment thermal allows very fine homogeneous precipitation at the levels of grain boundaries of the Fe2Nb3 phase. These precipitates serve as the center germination. They allow very homogeneous precipitation, at the joints of grains, of the Fe2Nb3 phase at any temperature greater than or equal to 750 ° C which is favorable for good creep resistance.
  • Table I presents the chemical analyzes of the shades studied. Shades 1 to 4 are shades according to the invention. Shades 5 to 9 are examples of comparisons.
  • Table II presents the creep results at 950 ° C. after 100 hours, cyclic oxidation at 950 ° C and 1000 ° C after 200h, hardness after annealing final and after heat treatment at 850 ° C according to the invention, as well as the ANb, the type of intermetallic present at T> 700 ° C and the presence or absence intermetallics at 950 ° C.
  • This table also shows the relationships satisfied or not by the elements of the compositions presented.
  • compositions which satisfy all relationships and which therefore have the best creep, oxidation and hardness characteristics before and after heat treatment, with the lowest ⁇ Nb, are grades 1-4 according to the invention.

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  • 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)
  • Catalysts (AREA)
  • Soft Magnetic Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP00402447A 1999-09-09 2000-09-06 Ferritisches Niobium-stabilisiertes 14% Chrom-stahl und dessen Verwendung in Kraftfahrzeugen Expired - Lifetime EP1083241B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9911257A FR2798394B1 (fr) 1999-09-09 1999-09-09 Acier ferritique a 14% de chrome stabilise au niobium et son utilisation dans le domaine de l'automobile
FR9911257 1999-09-09

Publications (2)

Publication Number Publication Date
EP1083241A1 true EP1083241A1 (de) 2001-03-14
EP1083241B1 EP1083241B1 (de) 2004-11-10

Family

ID=9549656

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Application Number Title Priority Date Filing Date
EP00402447A Expired - Lifetime EP1083241B1 (de) 1999-09-09 2000-09-06 Ferritisches Niobium-stabilisiertes 14% Chrom-stahl und dessen Verwendung in Kraftfahrzeugen

Country Status (8)

Country Link
US (2) US6423159B1 (de)
EP (1) EP1083241B1 (de)
AT (1) ATE282096T1 (de)
BR (1) BR0004032B1 (de)
DE (1) DE60015682T2 (de)
ES (1) ES2233308T3 (de)
FR (1) FR2798394B1 (de)
PT (1) PT1083241E (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818422A1 (de) * 2006-02-08 2007-08-15 Ugine & Alz France Ferritischer Edelstahl mit 19 % Chrom, der mit Niob stabilisiert ist
EP2246455A1 (de) * 2008-01-28 2010-11-03 Nippon Steel & Sumikin Stainless Steel Corporation Hochreiner ferritischer delstahl mit hervorragender korrosionsbeständigkeit und bearbeitbarkeit sowie herstellungsverfahren dafür
EP3670692A1 (de) 2018-12-21 2020-06-24 Outokumpu Oyj Ferritischer edelstahl

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1277180A2 (de) * 2000-04-24 2003-01-22 Visa International Service Association Beglaubigungsdienst für online-bezahler
US7682559B2 (en) * 2002-12-12 2010-03-23 Nippon Steel Corporation Cr-bearing heat-resistant steel sheet excellent in workability and method for production thereof
US20100089501A1 (en) * 2007-03-05 2010-04-15 Dong Energy A/S Martensitic Creep Resistant Steel Strengthened by Z-Phase
JP4624473B2 (ja) * 2008-12-09 2011-02-02 新日鐵住金ステンレス株式会社 耐銹性に優れた高純度フェライト系ステンレス鋼およびその製造方法
DE102009039552B4 (de) * 2009-09-01 2011-05-26 Thyssenkrupp Vdm Gmbh Verfahren zur Herstellung einer Eisen-Chrom-Legierung
JP5586279B2 (ja) * 2010-03-15 2014-09-10 新日鐵住金ステンレス株式会社 自動車排気系部材用フェライト系ステンレス鋼
JP6050701B2 (ja) * 2012-03-01 2016-12-21 新日鐵住金ステンレス株式会社 外装パネル用フェライト系ステンレス鋼板
UA111115C2 (uk) 2012-04-02 2016-03-25 Ейкей Стіл Пропертіс, Інк. Рентабельна феритна нержавіюча сталь
JP6006660B2 (ja) * 2013-02-26 2016-10-12 新日鐵住金ステンレス株式会社 耐酸化性および耐食性に優れた自動車排気系部材用省合金型フェライト系ステンレス鋼

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484956A (en) * 1983-02-23 1984-11-27 Sumitomo Metal Industries, Ltd. Process for producing heat-resistant ferritic stainless steel sheet
EP0225263A1 (de) * 1985-11-05 1987-06-10 Ugine Aciers De Chatillon Et Gueugnon Blech oder Band aus ferritischem rostfreien Stahl, insbesondere für Auspuffsysteme
EP0391054A1 (de) * 1989-04-06 1990-10-10 Krupp Stahl AG Verwendung eines hitzebeständigen Stahls für korrosionsbeständige Bauteile
EP0678587A1 (de) * 1994-04-21 1995-10-25 Kawasaki Steel Corporation Heissgewalzter ferritischer Stahl für eine Kraftfahrzeug-Abgasanlage
JPH1192872A (ja) * 1997-09-12 1999-04-06 Nippon Steel Corp 表面性状に優れたフェライト系ステンレス鋼及びその製造方法

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JPS519365Y2 (de) * 1972-09-05 1976-03-12
US3963532A (en) * 1974-05-30 1976-06-15 E. I. Du Pont De Nemours And Company Fe, Cr ferritic alloys containing Al and Nb
DE3173731D1 (en) * 1980-10-21 1986-03-20 Nippon Steel Corp Method for producing ferritic stainless steel sheets or strips containing aluminum
US5019332A (en) * 1988-03-16 1991-05-28 Carpenter Technology Corporation Heat, corrosion, and wear resistant steel alloy
JP3001718B2 (ja) * 1992-04-17 2000-01-24 新日本製鐵株式会社 フェライト系ステンレス鋼薄肉鋳片の製造方法
JP2705459B2 (ja) * 1992-06-01 1998-01-28 住友金属工業株式会社 フェライト系ステンレス鋼板の製造法
JP2772237B2 (ja) * 1994-03-29 1998-07-02 川崎製鉄株式会社 面内異方性が小さいフェライト系ステンレス鋼帯の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484956A (en) * 1983-02-23 1984-11-27 Sumitomo Metal Industries, Ltd. Process for producing heat-resistant ferritic stainless steel sheet
EP0225263A1 (de) * 1985-11-05 1987-06-10 Ugine Aciers De Chatillon Et Gueugnon Blech oder Band aus ferritischem rostfreien Stahl, insbesondere für Auspuffsysteme
EP0391054A1 (de) * 1989-04-06 1990-10-10 Krupp Stahl AG Verwendung eines hitzebeständigen Stahls für korrosionsbeständige Bauteile
EP0678587A1 (de) * 1994-04-21 1995-10-25 Kawasaki Steel Corporation Heissgewalzter ferritischer Stahl für eine Kraftfahrzeug-Abgasanlage
JPH1192872A (ja) * 1997-09-12 1999-04-06 Nippon Steel Corp 表面性状に優れたフェライト系ステンレス鋼及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 130, no. 20, 17 May 1999, Columbus, Ohio, US; abstract no. 270203, ABE, MASAYUKI ET AL: "Ferritic stainless steels having excellent surface properties and their preparation" XP002139529 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818422A1 (de) * 2006-02-08 2007-08-15 Ugine & Alz France Ferritischer Edelstahl mit 19 % Chrom, der mit Niob stabilisiert ist
EP1818421A1 (de) * 2006-02-08 2007-08-15 UGINE & ALZ FRANCE Ferritischer, Niobium-stabilisierter 19% Chrom-Edelstahl
EP2246455A1 (de) * 2008-01-28 2010-11-03 Nippon Steel & Sumikin Stainless Steel Corporation Hochreiner ferritischer delstahl mit hervorragender korrosionsbeständigkeit und bearbeitbarkeit sowie herstellungsverfahren dafür
EP2246455A4 (de) * 2008-01-28 2013-11-13 Nippon Steel & Sumikin Sst Hochreiner ferritischer delstahl mit hervorragender korrosionsbeständigkeit und bearbeitbarkeit sowie herstellungsverfahren dafür
EP3670692A1 (de) 2018-12-21 2020-06-24 Outokumpu Oyj Ferritischer edelstahl
WO2020127275A1 (en) 2018-12-21 2020-06-25 Outokumpu Oyj Ferritic stainless steel

Also Published As

Publication number Publication date
DE60015682D1 (de) 2004-12-16
US20020129877A1 (en) 2002-09-19
FR2798394B1 (fr) 2001-10-26
PT1083241E (pt) 2005-03-31
BR0004032A (pt) 2001-04-03
ATE282096T1 (de) 2004-11-15
ES2233308T3 (es) 2005-06-16
BR0004032B1 (pt) 2010-04-06
US6921440B2 (en) 2005-07-26
DE60015682T2 (de) 2005-12-15
EP1083241B1 (de) 2004-11-10
US6423159B1 (en) 2002-07-23
FR2798394A1 (fr) 2001-03-16

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