EP0566814B1 - Rostfreies Superduplexstahl mit hohe Korrosionsbeständigkeit und hoher Dehngrenze in lösungsgeglühten Zustand - Google Patents

Rostfreies Superduplexstahl mit hohe Korrosionsbeständigkeit und hoher Dehngrenze in lösungsgeglühten Zustand Download PDF

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Publication number
EP0566814B1
EP0566814B1 EP92830586A EP92830586A EP0566814B1 EP 0566814 B1 EP0566814 B1 EP 0566814B1 EP 92830586 A EP92830586 A EP 92830586A EP 92830586 A EP92830586 A EP 92830586A EP 0566814 B1 EP0566814 B1 EP 0566814B1
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EP
European Patent Office
Prior art keywords
max
corrosion resistance
stainless steel
yield strength
solution annealed
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Revoked
Application number
EP92830586A
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English (en)
French (fr)
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EP0566814A1 (de
Inventor
Luca Foroni
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FORONI SpA
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FORONI SpA
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Classifications

    • 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
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper

Definitions

  • Austenitic/Ferritic stainless steels presently on the market are those reported in the ASTM A790 specification with the addition of the Zeron 100, equivalent to UNS S32760, which is not yet included in the ASTM specification.
  • the steel grades which are mainly requested for the oil field applications are the UNS S32750 and UNS S32760.
  • the invention concerns the production of austenitic-ferritic stainless steel of the superduplex class, manufactured by electrical arc melting and A.O.D. refining.
  • the A.O.D. refining allows a deep deoxydation and desulphurization of the steel as well as to reach the required chemical composition in a repeatable way.
  • the analytical balancing of the alloying elements Cr, Mo, W, Cu and N is very important for obtaining the mechanical properties and the corrosion resistance on hot forged and/or rolled products in the solu tion annealed condition.
  • Our invention has taken advantage of the combined action of Mo, W, Cu, N which allows to reach a yield strength value higher than 620 MPa (90,000 PSI) as well as a generalized resistance to the stress corrosion, to the pitting and crevice corrosions.
  • the optimized chemical composition is the following : (weight in percent) C 0.025 max Mn 0.80 max Si 0.80 max Cr 24 - 26 Ni 6.5 - 8.0 Mo 3.0 - 4.0 S 0.002 max P 0.025 max Cu 1.2 - 2.0 W 0.80 - 1.2 N 0.23 - 0.33 Fe balance
  • Mechanical characteristics of the product solution annealed at 1080 °C Room Temp. 80°C 150°C Rs 0.2 MPa (KSI) 630 (91) 550 (80) 480 (70) R MPa (KSI) 865 (125) 800 (116) 750 (110) A % 40 HB 270 °C -45 -65 -100 KV Joule 300 144 38 2.
  • a B C weight loss (g/m 2 ) 0.049 0.070 0.76 N° of pitting/m 2 0 0 270 Max pit depth (micron) 0 0 100 Critical Pitting Temp.(°C) 80 60 50 2.3 Corrosion resistance in 5% Na Cl at PH 4 - 6 at 600 mV : A B C CPT (°C) 80 72 63 2.4 Crevice corrosion resistance (ASTM G78 modified) 100 days .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (8)

  1. Die chemische Zusammensetzung der Legierung lautet:
    (in Gewichprozenten) C 0.025 max Mn 0.80 max Si 0.80 max Cr 24 - 26 Ni 6.5 - 8.0 Mo 3.0 - 4.0 S 0.002 max P 0.025 max Cu 1.2 - 2.0 W 0.8 - 1.2 N 0.23 - 0.33 Fe Rest
    Grübchen-index = Cr + 3.3Mo + 16N > 42
    Figure imgb0001
     Ausgewogene chemische Zusammensetzung, zu erzielen nach 1 ö sungsunterstürtzter Hitzbehandlung bei 1070-1100°C und Alpha-Ferrit zwischen 40-60%.
  2. Legierung nach Patentanspruch 1: dadurch charakterisiert, daß der C-Gehalt 0.01-0.02% beträgt
  3. Legierung nach Patentanspruch 1; dadurch charakterisiert, daß der Si-Gehalt 0.35-0.60% beträgt
  4. Legierung nach Patentanspruch 1: dadurch charakterisiert, daß der Ni-Gehalt 7.0-7.5% beträgt
  5. Legierung nach Patentanspruch 1: dadurch charakterisiert, daß der Mo-Gehalt 3.7-4.0% beträgt
  6. Legierung nach Patentanspruch 1: dadurch charakterisiert, daß der Cu-Gehalt 1.6-1.9% beträgt
  7. Legierung nach Patentanspruch 1: dadurch charakterisiert, daß der W-Gehalt 0.9-1.1% beträgt
  8. Legierung nach Patentanspruch 1: dadurch charakterisiert, daß der N-Gehalt 0.25-0.30% beträgt
EP92830586A 1992-04-24 1992-10-26 Rostfreies Superduplexstahl mit hohe Korrosionsbeständigkeit und hoher Dehngrenze in lösungsgeglühten Zustand Revoked EP0566814B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM920309A IT1257695B (it) 1992-04-24 1992-04-24 Acciaio austeno-ferritico avente alta resistenza alla corrosione ed elevato carico di snervamento allo stato solubizzato.
ITRM920309 1992-04-24

Publications (2)

Publication Number Publication Date
EP0566814A1 EP0566814A1 (de) 1993-10-27
EP0566814B1 true EP0566814B1 (de) 1997-09-03

Family

ID=11400969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92830586A Revoked EP0566814B1 (de) 1992-04-24 1992-10-26 Rostfreies Superduplexstahl mit hohe Korrosionsbeständigkeit und hoher Dehngrenze in lösungsgeglühten Zustand

Country Status (4)

Country Link
EP (1) EP0566814B1 (de)
AT (1) ATE157710T1 (de)
DE (1) DE69222027D1 (de)
IT (1) IT1257695B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357653A1 (de) * 2003-12-10 2005-07-07 Abb Research Ltd. Schiffsantrieb

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1263251B (it) 1992-10-27 1996-08-05 Sviluppo Materiali Spa Procedimento per la produzione di manufatti in acciaio inossidabile super-duplex.
FR2711674B1 (fr) * 1993-10-21 1996-01-12 Creusot Loire Acier inoxydable austénitique à hautes caractéristiques ayant une grande stabilité structurale et utilisations.
JP3446294B2 (ja) * 1994-04-05 2003-09-16 住友金属工業株式会社 二相ステンレス鋼
ATE195559T1 (de) * 1994-05-21 2000-09-15 Park Yong S Rostfreies duplex-stahl mit guter korrosionsbeständigkeit
FI100422B (fi) * 1994-07-11 1997-11-28 Metso Paper Inc Telan valmistus
US8710405B2 (en) * 2005-04-15 2014-04-29 Nippon Steel & Sumikin Stainless Steel Corporation Austenitic stainless steel welding wire and welding structure
JP6115935B2 (ja) * 2013-01-25 2017-04-19 セイコーインスツル株式会社 二相ステンレス鋼からなる時効熱処理加工材とそれを用いたダイヤフラムと圧力センサとダイヤフラムバルブ及び二相ステンレス鋼の製造方法
GB2545768B (en) * 2015-12-23 2018-04-25 Goodwin Plc A steel, a cast, forged or wrought product and a welded product
BR112021012900B1 (pt) * 2019-01-30 2024-01-23 Jfe Steel Corporation Aço inoxidável duplex, cano ou tubo de aço sem costura e um método de fabricação do aço inoxidável duplex
CN111197144A (zh) * 2020-02-21 2020-05-26 青岛三庆金属有限公司 一种用于食品加热容器的耐高温不锈钢组合物

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61564A (ja) * 1984-06-13 1986-01-06 Nippon Kokan Kk <Nkk> 衝撃特性の優れた２相ステンレス鋼
GB2203680B (en) * 1987-04-21 1991-06-26 Nippon Yakin Kogyo Co Ltd A direct production process of a stainless steel strip having excellent superplasticity and surface properties
US4816085A (en) * 1987-08-14 1989-03-28 Haynes International, Inc. Tough weldable duplex stainless steel wire
US4915752A (en) * 1988-09-13 1990-04-10 Carondelet Foundry Company Corrosion resistant alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357653A1 (de) * 2003-12-10 2005-07-07 Abb Research Ltd. Schiffsantrieb

Also Published As

Publication number Publication date
ITRM920309A0 (it) 1992-04-24
IT1257695B (it) 1996-02-01
EP0566814A1 (de) 1993-10-27
DE69222027D1 (de) 1997-10-09
ATE157710T1 (de) 1997-09-15
ITRM920309A1 (it) 1993-10-24

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