EP1083241B1 - Acier ferritique à 14% de chrome stabilisé au niobium et son utilisation dans le domaine de l'automobile - Google Patents

Acier ferritique à 14% de chrome stabilisé au niobium et son utilisation dans le domaine de l'automobile Download PDF

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Publication number
EP1083241B1
EP1083241B1 EP00402447A EP00402447A EP1083241B1 EP 1083241 B1 EP1083241 B1 EP 1083241B1 EP 00402447 A EP00402447 A EP 00402447A EP 00402447 A EP00402447 A EP 00402447A EP 1083241 B1 EP1083241 B1 EP 1083241B1
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EP
European Patent Office
Prior art keywords
niobium
steel sheet
δnb
equation
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.)
Expired - Lifetime
Application number
EP00402447A
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German (de)
English (en)
French (fr)
Other versions
EP1083241A1 (fr
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 et Alz France SA
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Publication date
Application filed by Ugine et Alz France SA filed Critical Ugine et Alz France SA
Publication of EP1083241A1 publication Critical patent/EP1083241A1/fr
Application granted granted Critical
Publication of EP1083241B1 publication Critical patent/EP1083241B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/008Ferrous alloys, e.g. steel alloys containing tin
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236Cold rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273Final recrystallisation annealing

Definitions

  • the invention relates to a ferritic steel known as 14% chromium stabilized niobium and its use in the automotive field.
  • the object of the invention is to propose a ferritic steel, economic, which has a very good resistance to hot creep as well as oxidation, up to 1000 ° C and an improved hardness characteristic for its formatting.
  • EP-A-0 225 263 discloses a ferritic steel having good resistance to oxidation and creep at high temperature, especially with combined addition of Nb + Al + Zr, after hot rolling and cold, followed by a short final annealing at 1000 ° C. An addition of 0.025-0.10% of P is considered in EP-A-0 678 587 as being favorable for formability.
  • the invention also relates to a use of the steel sheet ferritics in the automotive field and in particular for the realization of exhaust line collector.
  • FIGS. 1A and 1B respectively show a microstructure 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 comprising 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 of about 0.43% having after heat treatment precipitates intergranular Fe2Nb, distributed in a disordered manner.
  • Figure 3 shows the mechanical characteristics in hardness for a steel according to the invention, referenced 1 in Tables I and II, and two comparative steels, referenced 6 and 9 in Tables I and II, before and after heat treatment of formation of precipitates respectively of Fe2Nb3 or Fe2Nb type.
  • ⁇ Nb ⁇ 0.3% the phase of Laves Fe2Nb is completely dissolved at temperatures equal to or greater than 950 ° C, as shown in Figure 1 B. This explains the poor behavior of these steels with creep resistance at or above 950 ° C.
  • This phase has a lower solubility than the Laves Fe2Nb phase.
  • a significant amount of Fe2Nb3 remains present as can be seen on the microstructure of the Figure 1A.
  • the presence of the Fe2Nb3 phase at high temperature, large quantity has the advantage of generating a very good creep resistance and shaping the steels according to the invention.
  • the Fe2Nb Laves phase is an intermetallic compound, which when present in steel, intragranularly precipitates and at joints grain in an anarchic manner and does not sufficiently prevent the displacement of the grain boundaries, so the material flows. An amount important of this intermetallic precipitate is necessary to improve the creep.
  • the ratio Si / Mn greater than 1 is not respected, it is also the intermetallic Fe2Nb3 that appears.
  • manganese increases the solubility of intermetallic Fe2Nb3 and the formation, at high temperature, a Z phase of the CrNbN type in the grains. At 950 ° C, the Fe2Nb3 intermetallic is thus dissolved. Steel has a bad creep and oxidation resistance. Silicon compensates for this effect.
  • a 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 minutes, after final annealing or prior to use has been performed.
  • the treatment temperature allows very fine homogeneous precipitation at grain boundaries of the Fe2Nb3 phase. These precipitates serve as a center germination. They allow a very homogeneous precipitation, at joints of grains, of the Fe2Nb3 phase at any temperature greater than or equal to 750 ° C which is favorable for a good resistance to creep.
  • a copper addition in a moderate content less than or equal to 1.5%, can be carried out.
  • Table I presents the chemical analyzes of the grades 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 100h. cyclic oxidation at 950 ° C and 1000 ° C after 200h, the 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 presents the relationships satisfied or not by the elements of the compositions presented.
  • compositions which satisfy all the relationships and which thus have the best creep, oxidation and hardness characteristics before and after heat treatment, with the lowest ⁇ Nb, are the 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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Soft Magnetic Materials (AREA)
EP00402447A 1999-09-09 2000-09-06 Acier ferritique à 14% de chrome stabilisé au niobium et son utilisation dans le domaine de l'automobile Expired - Lifetime EP1083241B1 (fr)

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 EP1083241A1 (fr) 2001-03-14
EP1083241B1 true EP1083241B1 (fr) 2004-11-10

Family

ID=9549656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00402447A Expired - Lifetime EP1083241B1 (fr) 1999-09-09 2000-09-06 Acier ferritique à 14% de chrome stabilisé au niobium et son utilisation dans le domaine de l'automobile

Country Status (8)

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

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101015341B1 (ko) * 2000-04-24 2011-02-16 비자 인터내셔날 써비스 어쏘시에이션 온라인 지불인 인증 서비스
JP4225976B2 (ja) * 2002-12-12 2009-02-18 新日鐵住金ステンレス株式会社 加工性に優れたCr含有耐熱鋼板およびその製造方法
EP1818421A1 (fr) * 2006-02-08 2007-08-15 UGINE & ALZ FRANCE Acier inoxydable ferritique dit à 19% de chrome stabilisé au niobium
US20100089501A1 (en) * 2007-03-05 2010-04-15 Dong Energy A/S Martensitic Creep Resistant Steel Strengthened by Z-Phase
JP4651682B2 (ja) * 2008-01-28 2011-03-16 新日鐵住金ステンレス株式会社 耐食性と加工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
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
SI3670692T1 (sl) 2018-12-21 2022-11-30 Outokumpu Oyj, Feritno nerjavno jeklo

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
JPS519365Y2 (pt) * 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
EP0050356B2 (en) * 1980-10-21 1990-03-07 Nippon Steel Corporation Method for producing ferritic stainless steel sheets or strips containing aluminum
JPS59153831A (ja) * 1983-02-23 1984-09-01 Sumitomo Metal Ind Ltd フエライト系耐熱ステンレス鋼板の製造法
FR2589482B1 (fr) * 1985-11-05 1987-11-27 Ugine Gueugnon Sa Tole ou bande en acier ferritique inoxydable, en particulier pour systemes d'echappement
US5019332A (en) * 1988-03-16 1991-05-28 Carpenter Technology Corporation Heat, corrosion, and wear resistant steel alloy
DE3911104C1 (pt) * 1989-04-06 1990-11-29 Krupp Stahl Ag, 4630 Bochum, De
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
CN1049699C (zh) * 1994-04-21 2000-02-23 川崎制铁株式会社 汽车排气材料用的热轧铁素体钢
JP3904683B2 (ja) * 1997-09-12 2007-04-11 新日鐵住金ステンレス株式会社 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

Also Published As

Publication number Publication date
US6921440B2 (en) 2005-07-26
EP1083241A1 (fr) 2001-03-14
FR2798394B1 (fr) 2001-10-26
BR0004032A (pt) 2001-04-03
ES2233308T3 (es) 2005-06-16
ATE282096T1 (de) 2004-11-15
DE60015682T2 (de) 2005-12-15
BR0004032B1 (pt) 2010-04-06
US20020129877A1 (en) 2002-09-19
US6423159B1 (en) 2002-07-23
PT1083241E (pt) 2005-03-31
DE60015682D1 (de) 2004-12-16
FR2798394A1 (fr) 2001-03-16

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