EP0818552A2 - 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
EP0818552A2
EP0818552A2 EP97111887A EP97111887A EP0818552A2 EP 0818552 A2 EP0818552 A2 EP 0818552A2 EP 97111887 A EP97111887 A EP 97111887A EP 97111887 A EP97111887 A EP 97111887A EP 0818552 A2 EP0818552 A2 EP 0818552A2
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EP
European Patent Office
Prior art keywords
vanadium
tantalum
niobium
nitrogen
carbon
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
EP97111887A
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German (de)
English (en)
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EP0818552A3 (fr
EP0818552B1 (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
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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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Publication of EP0818552B1 publication Critical patent/EP0818552B1/fr
Anticipated expiration legal-status Critical
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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 a stainless ferritic-austenitic Chromium-nickel cast steel alloy with small amounts of coordinated contents of other Alloy agent, the structure of which is 50 vol .-% Delta ferrite as a basic structure with finely divided austenite as the rest. About 50% ferrite, the rest Austenitic structure gives the duplex steel alloys good corrosion resistance and high Strength.
  • Duplex alloys of this type are known per se. So European Patent 0 220 141 describes a rustproof, high-nitrogen duplex steel alloy with high corrosion resistance and structural stability, the maximum 0.05% carbon, 23 to 27% chromium, 5.5 up 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, maximum 0.5% copper, maximum 0.5% Tungsten, at most 0.010% sulfur, up to 0.5% vanadium and up to 0.18% cerium, the rest including melting-related Impurities contains iron, its contents of alloying elements within the specified Salary limits coordinated in a certain way are.
  • European patent specification 0 156 778 is a corrosion-resistant, rustproof ferritic-austenitic Duplex steel alloy known.
  • the invention is based on the problem of corrosion resistance and strength of this type of cast steel alloy continue to improve.
  • the steel 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 over 0.5%, for example at 0.55% or also at 0.6%.
  • Of the total content of tungsten and tantalum can also contribute 0.05 to 0.80%.
  • the pitting resistance was determined in a solution containing 6% FeCl 3 in the temperature range according to ASTM G 48-76 on solution-annealed and water-quenched samples.
  • the critical temperature was that at which there was still no corrosion attack on the sample surface after 72 hours in the solution.
  • the temperature in question was measured with an accuracy of +/- 2.5 ° C. In these tests, a high critical temperature stands for improved corrosion behavior.
  • the data obtained in the tests demonstrate the greatly improved corrosion resistance of the cast steels according to the invention.
  • Table II below shows the results of the corrosion tests with the 4 test alloys in Table I, the critical pitting temperature of which was determined in the aforementioned manner in accordance with ASTM G 48-76.
  • the critical temperatures determined are considerably higher than those of commercially available higher-alloy cast steels; they are compared in Table II below with the PREN values of the individual alloys.
  • Table III shows the compositions of conventional cast or kneaded duplex steel alloys A to E. Alloy (%) A rolled B C rolled 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 Mon 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 rest rest rest rest rest rest rest rest rest rest rest
  • Table IV below shows the noticeably better ones mechanical properties of the cast steel alloys according to the invention 1 to 4.
  • a cobalt-free base alloy with a nominal composition of up to 0.025% carbon, up to 0.25% silicon, up to 0.40% manganese, 6.5 to 8.0% nickel, 0.25 to 0.30% nitrogen , 24.5 to 26.0% chromium, 4.0 to 4.5% molybdenum, 0.5 to 1.0% tungsten, 0.02 to 0.30% vanadium, to 0.30% niobium, to 0
  • 30% tantalum, up to 0.30% phosphorus, up to 0.002% sulfur, the rest iron, four further melts 5 to 8 were used as an example for a cast steel alloy also containing vanadium, niobium and tantalum (25.0 Cr- 4.25 Mo-7.4 Ni-0.28 N-Fe), but with a lower chromium content.
  • Table VI below shows the critical pitting temperature limit of test alloys 5 to 8 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.
  • alloys 5 to 8 The strength properties of alloys 5 to 8 according to the invention are shown in Table VIII below.
  • test alloys 9 to 12 are shown in Table IX below. Alloy (%) 9 10th 11 12th C. 0.021 0.022 0.021 0.015 Si 0.18 0.09 0.18 0.19 Mn 0.32 0.13 0.31 0.08 P 0.008 0.007 0.008 0.0095 S 0.005 ⁇ 0.005 ⁇ 0.005 0.005 Cr 23.41 23.03 23.42 23.68 Mon 3.85 3.59 3.87 3.61 Ni 6.35 6.19 6.40 5.93 V 0.15 0.012 0.15 - W 0.63 0.11 0.63 0.08 N 0.25 0.279 0.26 0.278 Nb 0.013 0.25 0.013 0.26 Ta ⁇ 0.02 ⁇ 0.02 0.02 0.22 Fe rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest rest
  • FIG. 5 again shows that the determined critical temperatures of the invention Test alloys not related to the above the dependence on the PREN value already mentioned in Example 1 consequences.
  • the test alloys according to the invention with their carefully coordinated levels on vanadium, tungsten, niobium, tantalum and carbon and Have nitrogen at a PREN of about 40, like results from the diagram in FIG. 6, a noticeable one better corrosion resistance.
  • test alloys 9 to 12 according to the invention are shown in Table XII below.

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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)
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
DE19628350 1996-07-13
DE19628350A DE19628350B4 (de) 1996-07-13 1996-07-13 Verwendung einer rostfreien ferritisch-austenitischen Stahllegierung

Publications (3)

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

Family

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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)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001064969A1 (fr) * 2000-03-02 2001-09-07 Sandvik Ab; (Publ) Acier inoxydable duplex
US6416871B1 (en) 1999-05-27 2002-07-09 Sandvik Ab Surface modification of high temperature alloys
EP2947169A4 (fr) * 2013-01-15 2016-12-21 Kobe Steel Ltd Matière d'acier inoxydable duplex et tuyau d'acier inoxydable duplex
EP3040434A4 (fr) * 2013-08-28 2017-05-03 Hitachi, Ltd. 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
EP3354762A4 (fr) * 2015-11-17 2019-04-24 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Matériau en acier inoxydable duplex et tube en acier inoxydable duplex
CN113215478A (zh) * 2021-05-14 2021-08-06 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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6416871B1 (en) 1999-05-27 2002-07-09 Sandvik Ab Surface modification of high temperature alloys
WO2001064969A1 (fr) * 2000-03-02 2001-09-07 Sandvik Ab; (Publ) Acier inoxydable duplex
US6749697B2 (en) 2000-03-02 2004-06-15 Sandvik Ab Duplex stainless steel
EP2947169A4 (fr) * 2013-01-15 2016-12-21 Kobe Steel Ltd Matière d'acier inoxydable duplex et tuyau d'acier inoxydable duplex
EP3040434A4 (fr) * 2013-08-28 2017-05-03 Hitachi, Ltd. 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
EP3354762A4 (fr) * 2015-11-17 2019-04-24 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Matériau en acier inoxydable duplex et tube en acier inoxydable duplex
CN113215478A (zh) * 2021-05-14 2021-08-06 东北大学 一种提升超级不锈钢抗高温氧化性能的方法
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

Also Published As

Publication number Publication date
ES2233986T3 (es) 2005-06-16
EP0818552A3 (fr) 1998-03-25
EP0818552B1 (fr) 2004-11-24
DE19628350B4 (de) 2004-04-15
DE19628350A1 (de) 1998-01-15
DE59712090D1 (de) 2004-12-30

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