EP0780483A1 - Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit - Google Patents
Hochfester wärmebeständiger austenitischer Stahl mit verbesserter Schweissbarkeit Download PDFInfo
- 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
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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
- C22C38/48—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)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP332341/95 | 1995-12-20 | ||
JP33234195 | 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 |
JP135412/96 | 1996-05-29 | ||
JP13541296 | 1996-05-29 |
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)
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)
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 |
AU2012279593B2 (en) | 2011-07-06 | 2014-08-07 | Nippon Steel Corporation | Austenitic steel welded joint |
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 (de) | 2015-06-05 | 2019-05-08 | Nippon Steel & Sumitomo Metal Corporation | Austenitischer edelstahl |
Citations (4)
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 |
-
1996
- 1996-05-29 JP JP13541296A patent/JP3388998B2/ja not_active Expired - Fee Related
- 1996-12-19 EP EP19960120536 patent/EP0780483B1/de not_active Expired - Lifetime
- 1996-12-19 DE DE1996620722 patent/DE69620722T2/de not_active Expired - Lifetime
Patent Citations (4)
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)
Title |
---|
IRON AND STEEL., vol. 70, pages S1409 |
THERMAL AND NUCLEAR ELECTRIC POWER GENERATION., vol. 38, pages 75 |
Cited By (6)
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 |
---|---|
DE69620722T2 (de) | 2002-12-05 |
JPH09228003A (ja) | 1997-09-02 |
JP3388998B2 (ja) | 2003-03-24 |
EP0780483B1 (de) | 2002-04-17 |
DE69620722D1 (de) | 2002-05-23 |
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