EP0818552B1 - Alliage de coulée en acier inoxydable du type ferritique-austénitique - Google Patents

Alliage de coulée en acier inoxydable du type ferritique-austénitique Download PDF

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Publication number
EP0818552B1
EP0818552B1 EP97111887A EP97111887A EP0818552B1 EP 0818552 B1 EP0818552 B1 EP 0818552B1 EP 97111887 A EP97111887 A EP 97111887A EP 97111887 A EP97111887 A EP 97111887A EP 0818552 B1 EP0818552 B1 EP 0818552B1
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EP
European Patent Office
Prior art keywords
vanadium
niobium
ferritic
tantalum
tungsten
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
EP97111887A
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German (de)
English (en)
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EP0818552A2 (fr
EP0818552A3 (fr
Inventor
Willi Kleemann
Benno Hoffmann
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.)
Schmidt and Clemens GmbH and Co KG
Original Assignee
Schmidt and Clemens GmbH and Co
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Publication date
Application filed by Schmidt and Clemens GmbH and Co filed Critical Schmidt and Clemens GmbH and Co
Publication of EP0818552A2 publication Critical patent/EP0818552A2/fr
Publication of EP0818552A3 publication Critical patent/EP0818552A3/fr
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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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Definitions

  • the invention relates to the use of objects made of a stainless ferritic-austenitic Chromium-nickel steel alloy with small amounts of coordinated Contain further alloying agents, a structure that is 50 vol .-% Delta ferrite as the basic structure with finely divided austenite as the rest gives the duplex steel alloys have good corrosion resistance and high Strength.
  • Duplex alloys of this type are known per se. This is how the European describes Patent Specification 0 220 141 a stainless, high nitrogen-containing duplex wrought alloy with high corrosion resistance and structural stability, the maximum 0.05% carbon, 23 to 27% chromium, 5.5 to 9% nickel, 0.25 to 0.40% nitrogen, at most 0.8% silicon, at most 1.2% manganese, 3.5 to 4.9% Molybdenum, at most 0.5% copper, at most 0.5% tungsten, at most 0.010 % Sulfur, up to 0.5% vanadium and up to 0.18% cerium, balance including smelting contaminants contains iron; their levels Alloy elements within the specified salary limits in certain Are coordinated.
  • This alloy requires solution annealing at about 1075 ° C to adjust the structure to a ferrite content of 30 to 55%; it is suitable for solution-annealed, cold-formed and also welded Condition especially for use in a chloride environment.
  • European Patent 0 156 778 describes a corrosion-resistant, stainless ferritic-austenitic duplex steel alloy known.
  • the invention is based on the problem of corrosion resistance and To further improve the strength of this type of cast steel alloy.
  • the invention proposes use according to claim 1.
  • the steel to be used according to the invention preferably contains at least 0.1% better still at least 0.2% tungsten, vanadium, niobium and tantalum individually or side by side.
  • the tungsten content can also be above 0.5%, for example at 0.55% or also at 0.6%.
  • the total content can Tungsten and tantalum are 0.05 to 0.80%.
  • Table II below shows the critical pitting temperature limit of test alloys 1 and 2 in the test described above according to ASTM G 48-76.
  • the critical temperatures (T k ) determined in this case are considerably higher in comparison with commercially available cast steel alloys; they are compared to the respective PREN values of the individual alloys.
  • compositions of the heart mixtures cast or kneaded alloys A to E on which the diagram in FIG. 1 is based are shown in Table III below.
  • Alloy (%) A B C D e C 0.03 0.03 0.03 - - Si 0.35 0.31 0.20 - - Mn 0.75 0.54 0.80 - - P 0.019 0.031 0,012 - - S 0.005 0.011 0,002 - - Cr 25.5 27.2 27.4 25.0 27 Mo 4.1 3.1 3.1 3.0 3.1 Ni 7.0 8.3 8.0 5.5 8th Cu 0.24 2.71 2.51 1.7 1.0 V - - - - - W - - - - N 0.27 0.23 0.24 0.18 0.22 Nb - - - - - - - Fe rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (5)

  1. Utilisation d'objets composés d'un alliage inoxydable ferritique-austénitique présentant une grande stabilité et une grande résistance à la corrosion, en particulier une grande résistance contre les piqûres de corrosion, comportant jusqu'à 0,030 % de carbone jusqu'à 0,30 % de silicium jusqu'à 0,40 % de manganèse 6,5 à 8,5 % de nickel 0,25 à 0,30 % d'azote 24,5 à 26,5 % de chrome 4,0 à 4,5 % de molybdène jusqu'à 1,0 % de tungstène jusqu'à 0,20 % de vanadium Jusqu'à 0,3 % de niobium 0,15 à 0,3 % de vanadium et de niobium jusqu'à 0,31 % de tantale jusqu'à 0,015 % de phosphore jusqu'à 0,005 % de soufre,
    le reste étant du fer comportant des impuretés, conditionnées par la fusion, les teneurs en vanadium, niobium, tantale, carbone et azote répondant à la condition [(% V= + (% Nb) + (% Ta)] / [(% C) + (% N)] = 0,5 à 1,0, à l'état fondu.
  2. Utilisation d'objets selon la revendication 1 comportant au moins 0,1 % de tungstène, de vanadium, de niobium et de tantale, seuls ou les uns avec les autres, à l'état fondu.
  3. Utilisation d'objets selon la revendication 1 ou 2, comportant une teneur totale en tungstène et titane comprise entre 0,05 et 0,80 %.
  4. Utilisation d'objets selon une ou plusieurs des revendications 1 à 3, présentant une teneur totale en vanadium et niobium comprise entre 0,15 et 30 %.
  5. Utilisation d'objets selon l'une des revendications 1 à 4, qui exigent, pour une bonne ténacité, une stabilité et une résistance à la corrosion élevées, en particulier une résistance contre les piqûres de corrosion dans des milieux chlorés.
EP97111887A 1996-07-13 1997-07-12 Alliage de coulée en acier inoxydable du type ferritique-austénitique Expired - Lifetime EP0818552B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19628350A DE19628350B4 (de) 1996-07-13 1996-07-13 Verwendung einer rostfreien ferritisch-austenitischen Stahllegierung
DE19628350 1996-07-13

Publications (3)

Publication Number Publication Date
EP0818552A2 EP0818552A2 (fr) 1998-01-14
EP0818552A3 EP0818552A3 (fr) 1998-03-25
EP0818552B1 true EP0818552B1 (fr) 2004-11-24

Family

ID=7799785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111887A Expired - Lifetime EP0818552B1 (fr) 1996-07-13 1997-07-12 Alliage de coulée en acier inoxydable du type ferritique-austénitique

Country Status (3)

Country Link
EP (1) EP0818552B1 (fr)
DE (2) DE19628350B4 (fr)
ES (1) ES2233986T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000073530A1 (fr) 1999-05-27 2000-12-07 Sandvik Ab; (Publ) Modification de surface d'alliages haute temperature
SE514816C2 (sv) 2000-03-02 2001-04-30 Sandvik Ab Duplext rostfritt stål
CN104919072B (zh) * 2013-01-15 2017-07-14 株式会社神户制钢所 双相不锈钢钢材和双相不锈钢钢管
WO2015029167A1 (fr) * 2013-08-28 2015-03-05 株式会社日立製作所 Acier inoxydable duplex et structure en acier inoxydable duplex, structure marine, structure pour environnement pétrolier/gazier, rotor de pompe, corps de pompe et corps de soupape de réglage de débit utilisant cet acier
JP2017095794A (ja) * 2015-11-17 2017-06-01 株式会社神戸製鋼所 二相ステンレス鋼材および二相ステンレス鋼管
CN113215478B (zh) * 2021-05-14 2022-03-04 东北大学 一种提升超级不锈钢抗高温氧化性能的方法
CN114921710A (zh) * 2022-05-20 2022-08-19 青田保俐铸造有限公司 一种提高不锈钢304铸件耐腐蚀的铸造工艺

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7705578L (sv) * 1976-05-15 1977-11-16 Nippon Steel Corp Tvafasigt rostfritt stal
DE3310693A1 (de) * 1983-03-24 1984-10-04 Fried. Krupp Gmbh, 4300 Essen Korrosionsbestaendiger chromstahl und verfahren zu seiner herstellung
SE451465B (sv) * 1984-03-30 1987-10-12 Sandvik Steel Ab Ferrit-austenitiskt rostfritt stal mikrolegerat med molybden och koppar och anvendning av stalet
SE453838B (sv) * 1985-09-05 1988-03-07 Santrade Ltd Hogkvevehaltigt ferrit-austenitiskt rostfritt stal
US4715908A (en) * 1985-11-26 1987-12-29 Esco Corporation Duplex stainless steel product with improved mechanical properties
JPH0717987B2 (ja) * 1989-03-29 1995-03-01 住友金属工業株式会社 熱間加工性に優れた高耐食二相ステンレス鋼
JP3227734B2 (ja) * 1991-09-30 2001-11-12 住友金属工業株式会社 高耐食二相ステンレス鋼とその製造方法
JP2500162B2 (ja) * 1991-11-11 1996-05-29 住友金属工業株式会社 耐食性に優れた高強度二相ステンレス鋼
SE501321C2 (sv) * 1993-06-21 1995-01-16 Sandvik Ab Ferrit-austenitiskt rostfritt stål samt användning av stålet
JP3236713B2 (ja) * 1993-10-20 2001-12-10 川崎製鉄株式会社 深絞り成形性に優れたＦｅ−Ｃｒ−Ｎｉ系合金

Also Published As

Publication number Publication date
DE19628350B4 (de) 2004-04-15
ES2233986T3 (es) 2005-06-16
EP0818552A2 (fr) 1998-01-14
DE19628350A1 (de) 1998-01-15
DE59712090D1 (de) 2004-12-30
EP0818552A3 (fr) 1998-03-25

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