EP0780483A1 - Acier thermorésistant austénitique à résistance élevée ayant une soudabilité améliorée - Google Patents

Acier thermorésistant austénitique à résistance élevée ayant une soudabilité améliorée Download PDF

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Publication number
EP0780483A1
EP0780483A1 EP96120536A EP96120536A EP0780483A1 EP 0780483 A1 EP0780483 A1 EP 0780483A1 EP 96120536 A EP96120536 A EP 96120536A EP 96120536 A EP96120536 A EP 96120536A EP 0780483 A1 EP0780483 A1 EP 0780483A1
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EP
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Prior art keywords
amount
strength
steels
content
weldability
Prior art date
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EP96120536A
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German (de)
English (en)
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EP0780483B1 (fr
Inventor
Tetsuo c/o Nippon Steel Corporation Ishitsuka
Hiroyuki c/o Nippon Steel Corporation Mimura
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Nippon Steel Corp
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Nippon Steel Corp
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium

Definitions

  • An object of the present invention is to provide an austenitic heat-resisting steel having a good weldability and high-temperature strength.
  • Si is not only effective as a deoxidizer but also improves the oxidation resistance and the resistance to high-temperature corrosion. However, Si, when present in an excessive amount, reduces the creep rupture strength, the toughness and the weldability, and therefore, the Si content is limited to not more than 5%.
  • Mn is a deoxidizer and improves the weldability and the hot workability.
  • Mn when present in an excessive amount, causes degradation of the oxidation resistance, and therefore, the Mn content is limited to less than 2%.
  • Ni is essential for improving the stability of austenite and suppressing the formation of the ⁇ phase.
  • Ni In the steel according to the present invention, Ni must be present in an amount of 6% or more to stabilize austenite with respect to Cr and other ferrite formers present in the specified amounts.
  • the use of Ni in a large amount is not economical, and therefore, the Ni content is limited to not more than 15%.
  • the creep rupture strength substantially varies with the amounts of C and Nb.
  • the amounts of C and Nb are 0.025% or more and 0.25% or more, respectively, an improved creep rupture strength is obtained through a synergistic or combined effect of the W or W + Mo amount and the C + Nb amount.
  • the synergistic effect is not obtained when the W or W + Mo amount is less than 1.5%.
  • Mo and W when present in a total amount of more than 10%, also cause a problem in that the Laves phase and other intermetallic compounds coarsen and reduce the creep rupture strength.
  • W when Mo is added alone or not combined with W, the resistance to high-temperature corrosion is reduced with increase of the Mo amount as shown in Fig. 3.
  • W even when added alone or not combined with Mo, does not cause reduction in the resistance to high-temperature corrosion, and when combined with Mo, improves the resistance to high-temperature corrosion in comparison with that achieved when Mo alone is added. Therefore, W must be present in an amount of 1.5 to 10%. Mo may be present in combination with W but the Mo content must not be more than 2.0% because the resistance to high-temperature corrosion is sharply reduced when the Mo content is more than 2.0%, even when combined with W.
  • Nb sharply improves the long duration creep rupture strength by the formation of fine carbonitrides.
  • the Nb content must be 0.1% or more as can be seen from Fig. 4. The effect becomes more significant as the Nb amount is increased within a range in which Nb is completely dissolvable in a solid solution state. However, when the Nb amount is more than this range, undissolved carbides and nitrides are retained to reduce the creep rupture strength. Therefore, the Nb amount must not be more than 0.5%.
  • V forms fine nitrides and improves the long duration creep rupture strength. As shown in Fig. 5, this effect is obtained when the V amount is 0.05% or more and the improvement is reduced when the V amount is more than 1.5%. Therefore, the V amount is 0.05 to 1.5%.
  • P forms phosphides and improves the long duration creep rupture strength as shown in Fig. 6.
  • P when present in an excessive amount, sharply reduces not only the weldability but also the hot workability, and therefore, the P must not be present in an amount of more than 0.03%.
  • S segregates at crystal grain boundaries and reduces the hot workability and also facilitates the grain boundary embrittlement under the creep condition, and therefore, the S content is limited to not more than 0.005%.
  • Tables 1-1 and 2-1 summarize the chemical compositions and the properties of the steels tested. After being subjected to a solid solution heat treatment at 1250°C, the steels were subjected to a Varestraint test, a creep rupture test at 700, 750 and 800°C, and a high-temperature corrosion test at 650°C.
  • the Varestraint test was carried out using the GTAW welding method, under the conditions of a test piece thickness of 4 mm, a welding voltage of 10V, a welding current of 80A, a welding speed of 80 mm/min, and an applied strain of 4%.
  • the creep rupture data were standardized by the Larson-Miller method to estimate the creep rupture strength at 650°C for 100,000 hours.
  • the comparative steel AI contains an excessive amount of P and has an improved high-temperature strength but has a poor weldability.

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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)
  • Arc Welding In General (AREA)
EP19960120536 1995-12-20 1996-12-19 Acier thermorésistant austénitique à résistance élevée ayant une soudabilité améliorée Expired - Lifetime EP0780483B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP33234195 1995-12-20
JP332341/95 1995-12-20
JP33234195 1995-12-20
JP13541296A JP3388998B2 (ja) 1995-12-20 1996-05-29 溶接性に優れた高強度オーステナイト系耐熱鋼
JP13541296 1996-05-29
JP135412/96 1996-05-29

Publications (2)

Publication Number Publication Date
EP0780483A1 true EP0780483A1 (fr) 1997-06-25
EP0780483B1 EP0780483B1 (fr) 2002-04-17

Family

ID=26469269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960120536 Expired - Lifetime EP0780483B1 (fr) 1995-12-20 1996-12-19 Acier thermorésistant austénitique à résistance élevée ayant une soudabilité améliorée

Country Status (3)

Country Link
EP (1) EP0780483B1 (fr)
JP (1) JP3388998B2 (fr)
DE (1) DE69620722T2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215299A2 (fr) * 2000-12-18 2002-06-19 ALSTOM (Switzerland) Ltd Acier de traitment à durcissement par precipitation des nitrides et à transformation controllée
EP1471158A1 (fr) * 2003-04-25 2004-10-27 Sumitomo Metal Industries, Ltd. Acier inoxydable austénitique
EP2832886A4 (fr) * 2012-03-30 2016-03-23 Nippon Steel & Sumikin Sst Tôle en acier inoxydable austénitique qui résiste à la chaleur

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4523696B2 (ja) * 2000-04-18 2010-08-11 新日本製鐵株式会社 高温強度に優れたオーステナイト系耐熱鋼用ｔｉｇ溶接材料
KR101586590B1 (ko) * 2011-07-06 2016-01-18 신닛테츠스미킨 카부시키카이샤 오스테나이트강 용접 조인트
JP5661001B2 (ja) * 2011-08-23 2015-01-28 山陽特殊製鋼株式会社 時効後靭性に優れた高強度オーステナイト系耐熱鋼
EP3178958B1 (fr) 2015-06-05 2019-05-08 Nippon Steel & Sumitomo Metal Corporation Acier inoxydable austénitique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB617194A (en) * 1945-06-13 1949-02-02 Haynes Stellite Co Alloys for high temperature use
GB1224898A (en) * 1967-06-07 1971-03-10 Ugine Kuhlmann Improved steels
US3693245A (en) * 1966-01-13 1972-09-26 Jean Jacques De Cadenet Welded deposits for austenitic steels
EP0178374A1 (fr) * 1984-10-03 1986-04-23 Kabushiki Kaisha Toshiba Acier de coulée austénitique, résistant aux températures élevées

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB617194A (en) * 1945-06-13 1949-02-02 Haynes Stellite Co Alloys for high temperature use
US3693245A (en) * 1966-01-13 1972-09-26 Jean Jacques De Cadenet Welded deposits for austenitic steels
GB1224898A (en) * 1967-06-07 1971-03-10 Ugine Kuhlmann Improved steels
EP0178374A1 (fr) * 1984-10-03 1986-04-23 Kabushiki Kaisha Toshiba Acier de coulée austénitique, résistant aux températures élevées

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IRON AND STEEL., vol. 70, pages S1409
THERMAL AND NUCLEAR ELECTRIC POWER GENERATION., vol. 38, pages 75

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215299A2 (fr) * 2000-12-18 2002-06-19 ALSTOM (Switzerland) Ltd Acier de traitment à durcissement par precipitation des nitrides et à transformation controllée
EP1215299A3 (fr) * 2000-12-18 2003-12-10 ALSTOM (Switzerland) Ltd Acier de traitment à durcissement par precipitation des nitrides et à transformation controllée
EP1471158A1 (fr) * 2003-04-25 2004-10-27 Sumitomo Metal Industries, Ltd. Acier inoxydable austénitique
US6918968B2 (en) 2003-04-25 2005-07-19 Sumitomo Metal Industries, Ltd. Austenitic stainless steel
EP2832886A4 (fr) * 2012-03-30 2016-03-23 Nippon Steel & Sumikin Sst Tôle en acier inoxydable austénitique qui résiste à la chaleur
US9714459B2 (en) 2012-03-30 2017-07-25 Nippon Steel & Sumikin Stainless Steel Corporation Heat-resistant austenitic stainless steel sheet

Also Published As

Publication number Publication date
JPH09228003A (ja) 1997-09-02
JP3388998B2 (ja) 2003-03-24
EP0780483B1 (fr) 2002-04-17
DE69620722T2 (de) 2002-12-05
DE69620722D1 (de) 2002-05-23

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