EP0780483A1 - Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit - Google Patents

Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit Download PDF

Info

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
Authority
EP
European Patent Office
Prior art keywords
amount
strength
steels
content
weldability
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
EP96120536A
Other languages
English (en)
French (fr)
Other versions
EP0780483B1 (de
Inventor
Tetsuo c/o Nippon Steel Corporation Ishitsuka
Hiroyuki c/o Nippon Steel Corporation Mimura
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26469269&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0780483(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0780483A1 publication Critical patent/EP0780483A1/de
Application granted granted Critical
Publication of EP0780483B1 publication Critical patent/EP0780483B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C22C38/48—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.

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)
  • Arc Welding In General (AREA)
EP19960120536 1995-12-20 1996-12-19 Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit Expired - Lifetime EP0780483B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP33234195 1995-12-20
JP33234195 1995-12-20
JP332341/95 1995-12-20
JP13541296 1996-05-29
JP135412/96 1996-05-29
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

Publications (2)

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

Family

ID=26469269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960120536 Expired - Lifetime EP0780483B1 (de) 1995-12-20 1996-12-19 Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit

Country Status (3)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1215299A2 (de) * 2000-12-18 2002-06-19 ALSTOM (Switzerland) Ltd Umwandlungskontrollierter Nitrid-ausscheidungshärtender Vergütungsstahl
EP1471158A1 (de) * 2003-04-25 2004-10-27 Sumitomo Metal Industries, Ltd. Rostfreiem austenitischem Stahl
EP2832886A4 (de) * 2012-03-30 2016-03-23 Nippon Steel & Sumikin Sst Hitzebeständiges blech aus austenitischem rostfreiem stahl

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
WO2013005570A1 (ja) * 2011-07-06 2013-01-10 新日鐵住金株式会社 オーステナイト鋼溶接継手
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
WO2016195106A1 (ja) 2015-06-05 2016-12-08 新日鐵住金株式会社 オーステナイトステンレス鋼

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 (de) * 1984-10-03 1986-04-23 Kabushiki Kaisha Toshiba Hitzebeständiger austenitischer Gussstahl

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 (de) * 1984-10-03 1986-04-23 Kabushiki Kaisha Toshiba Hitzebeständiger austenitischer Gussstahl

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 (de) * 2000-12-18 2002-06-19 ALSTOM (Switzerland) Ltd Umwandlungskontrollierter Nitrid-ausscheidungshärtender Vergütungsstahl
EP1215299A3 (de) * 2000-12-18 2003-12-10 ALSTOM (Switzerland) Ltd Umwandlungskontrollierter Nitrid-ausscheidungshärtender Vergütungsstahl
EP1471158A1 (de) * 2003-04-25 2004-10-27 Sumitomo Metal Industries, Ltd. Rostfreiem austenitischem Stahl
US6918968B2 (en) 2003-04-25 2005-07-19 Sumitomo Metal Industries, Ltd. Austenitic stainless steel
EP2832886A4 (de) * 2012-03-30 2016-03-23 Nippon Steel & Sumikin Sst Hitzebeständiges blech aus austenitischem rostfreiem stahl
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
JP3388998B2 (ja) 2003-03-24
DE69620722T2 (de) 2002-12-05
JPH09228003A (ja) 1997-09-02
DE69620722D1 (de) 2002-05-23
EP0780483B1 (de) 2002-04-17

Similar Documents

Publication Publication Date Title
EP0386673A1 (de) Hochfester Stahl mit hohem Chromgehalt und mit sehr guten Zähigkeits- und Oxidationsbeständigkeitseigenschaften
JPH062927B2 (ja) 耐食、耐酸化性に優れた高強度低合金鋼
EP0930127B1 (de) Werkstoffe zum Schweissen von Stahl mit hohem Chromgehalt
EP0780483A1 (de) Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit
JPH06322488A (ja) 溶接性に優れ、耐高温腐食特性が良好な高強度オーステナイト系耐熱鋼
EP0642877A1 (de) Inertgaslichtbogenschweissdraht für temperaturbeständigen hochchromhaltigen ferritischen stahl
EP3795708B1 (de) Kriechbeständiges schweissgut mit hohem chromgehalt zum lichtbogenschweissen von dickwandigen stahlteilen
JP2742201B2 (ja) 高強度Ｃｒ−Ｍｏ鋼用ＴＩＧ溶接ワイヤ
JPS5914097B2 (ja) 靭性を改良せるフェライト系耐熱鋼
EP3795709B1 (de) Kriechbeständiges schweissgut mit hohem chromgehalt zum lichtbogenschweissen von dünnwandigen stahlteilen
JPH07290275A (ja) 高強度Ｃｒ−Ｍｏ鋼用溶接ワイヤ
JPH0543986A (ja) 溶接熱影響部の強度低下の小さい高クロムフエライト耐熱鋼
JP7295418B2 (ja) 溶接材料
JP2561592B2 (ja) 高Ｃｒフェライト系耐熱鋼用溶接材料
JP3527640B2 (ja) 高Ｃｒフェライト系耐熱鋼用溶接金属
EP0669405A2 (de) Wärmebeständiger Stahl
JP3194207B2 (ja) 高Ｃｒフェライト系耐熱鋼用被覆アーク溶接棒
JP2543801B2 (ja) 高Ｃｒフェライト系耐熱鋼用被覆ア―ク溶接棒
JP2000061687A (ja) 高靭性溶接金属
JP2551511B2 (ja) 高Ｃｒフェライト系耐熱鋼用溶接材料
JPH09239584A (ja) ガスシールドアーク溶接用ワイヤ
RU2194602C2 (ru) Состав сварочной проволоки
JPS60162757A (ja) 高温用高耐食オ−ステナイトステンレス鋼
JP2583114B2 (ja) 耐溶接割れ性にすぐれる低炭素ＣｒーＭｏ鋼板
JPH07155988A (ja) 高Ｃｒフェライト系耐熱鋼用被覆アーク溶接棒

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19970117

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR SE

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 20001208

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NIPPON STEEL CORPORATION

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR SE

REF Corresponds to:

Ref document number: 69620722

Country of ref document: DE

Date of ref document: 20020523

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20021030

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20030120

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 69620722

Country of ref document: DE

Representative=s name: VOSSIUS & PARTNER PATENTANWAELTE RECHTSANWAELT, DE

Effective date: 20130227

Ref country code: DE

Ref legal event code: R082

Ref document number: 69620722

Country of ref document: DE

Representative=s name: VOSSIUS & PARTNER, DE

Effective date: 20130227

Ref country code: DE

Ref legal event code: R081

Ref document number: 69620722

Country of ref document: DE

Owner name: NIPPON STEEL & SUMITOMO METAL CORPORATION, JP

Free format text: FORMER OWNER: NIPPON STEEL CORP., TOKIO/TOKYO, JP

Effective date: 20130227

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

Owner name: NIPPON STEEL & SUMITOMO METAL CORPORATION, JP

Effective date: 20130913

Ref country code: FR

Ref legal event code: CA

Effective date: 20130913

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20151215

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20151211

Year of fee payment: 20

Ref country code: FR

Payment date: 20151110

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69620722

Country of ref document: DE

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG