EP0078440B1 - Austenitic steel with resistance to neutron induced swelling - Google Patents
Austenitic steel with resistance to neutron induced swelling Download PDFInfo
- Publication number
- EP0078440B1 EP0078440B1 EP82109616A EP82109616A EP0078440B1 EP 0078440 B1 EP0078440 B1 EP 0078440B1 EP 82109616 A EP82109616 A EP 82109616A EP 82109616 A EP82109616 A EP 82109616A EP 0078440 B1 EP0078440 B1 EP 0078440B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- content
- austenitic steel
- steel
- silicon
- molybdenum
- 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.)
- Expired
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Glass Compositions (AREA)
- Heat Treatment Of Steel (AREA)
- Particle Accelerators (AREA)
- Laminated Bodies (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen austenitischen rostfreien Stahl nach dem Oberbegriff des Patentanspruchs. Ein derartiger Stahl ist unter der Bezeichnung 1.4970 handelsüblich, wobei der Gehalt an Silizium zwischen-0,30 und 0,55 % (hier und im folgenden alle Angaben in Gewichtsprozent) und der Molybdängehalt 1,0 bis 1,4 % beträgt. Für diesen Stahl werden auch Höchstgehalte an Phosphor, Schwefel, Kalzium, Kupfer, Kobalt, Tantal, Vanadium und Stickstoff angegeben, die im Bereich einiger hundertstel Prozent liegen. Dieser Stahl findet wegen seiner Korrosionsbeständigkeit und seiner guten Festigkeitseigenschaften Verwendung beim Bau von Kernreaktoren, darunter auch solchen Reaktoren, die mit schnellen Neutronen betrieben werden. Unter dem Einfluß einer solchen Neutronenstrahlung und bei Temperaturen von 400° C und darüber, wie sie in mit Flüssigmetall als Kühlmittel betriebenen Reaktoren erreicht werden, zeigt dieser Stahl wie andere Werkstoffe auch ein Schwellen, das darauf zurückgeführt wird, daß durch die schnellen Neutronen Veränderungen im Mikrogefüge verursacht werden, die zu einer Porenbildung und damit Volumenschwellen führen. Dieses Volumenschwellen erreicht bei dem genannten Stahl insbesondere bei dessen Verwendung als Material für Hüllrohre und Brennelementkästen ein Ausmaß, das die Standzeit solcher Bauteile in unerwünschter Weise herabsetzt.The present invention relates to an austenitic stainless steel according to the preamble of the claim. Such a steel is commercially available under the name 1.4970, the silicon content being between -0.30 and 0.55% (here and in the following all data in percent by weight) and the molybdenum content being 1.0 to 1.4%. Maximum levels of phosphorus, sulfur, calcium, copper, cobalt, tantalum, vanadium and nitrogen are also specified for this steel, which are in the range of a few hundredths of a percent. Because of its corrosion resistance and good strength properties, this steel is used in the construction of nuclear reactors, including those that are operated with fast neutrons. Under the influence of such neutron radiation and at temperatures of 400 ° C and above, as they are achieved in reactors operated with liquid metal as a coolant, this steel, like other materials, also shows a threshold which is attributed to the fact that changes in the Microstructures are caused, which lead to pore formation and thus volume thresholds. This volume swelling reaches a level in the case of the steel mentioned, in particular when it is used as a material for cladding tubes and fuel element boxes, which undesirably reduces the service life of such components.
Aufgabe der vorliegenden Erfindung ist eine verbesserung des Schwellverhaltens von austenitischen Stählen der genannten Art durch geringe Änderungen ihrer Zusammensetzung, die ohne signifikanten Einfluß auf die sonstigen Eigenschaften des Werkstoffs bleibt. Aus der DE-A 26 31 954 sind bereits Versuche bekannt, den in seinen Eigenschaften ähnlichen, unter der Bezeichnung "Type 316" im Handel befindlichen austenitischen Stahl in seiner Zusammensetzung so abzuwandeln, daß ein verringertes Schwellen unter Neutronenbeschuß erzielt wird. Hierzu werden innerhalb eines bestimmten Bereiches liegende Verhältnisse zwischen den Gehalten an Eisen, Chrom und Nickel vorgeschlagen, sowie als die Bildung von Hohlräumen hemmende Elemente Silizium in einer Konzentration von 0,7 bis 2 % und Titan in einer Konzentration von 0,1 bis 0,5 %. Hier wird allerdings von einer Grundlegierung ausgegangen, die and 1,8 bis 2,3 % Molybdän enthält. Bei gleichbleibendem Titangehalt den oben genannten Stahl 1.4970 durch eine Erhöhung des Siliziumgehaltes bei gleichzeitiger geringfügiger Anhebung des Molybdängehaltes abzuwandeln, lag für den Fachmann umso weniger nahe, als V. Levy u.a.in "Effect of Structure and Alloying Elements on void Formation in Austenitic Steels and Nickel Alloys" in M.L. Bleiberg/J.W. Bennett (Hrsgb.): "Radiation Effects in Breeder Reactor Structural Materials"; New York 1977 Seitem 709 bis 725, gezeigt hatten, (Tabelle 11), daß bei einem Stahl des Typs 316 eine Erhöhung des Molybdängehaltes von 1 auf 2 % zunächst zu einer Vergrößerung des Volumenschwellens unter Neutronenbeschuß führt, wobei diese Werte bei weiter gesteigetem Molybdängehalt wieder abnehmen.The object of the present invention is to improve the swelling behavior of austenitic steels of the type mentioned by slight changes in their composition, which has no significant influence on the other properties of the material. From DE-A 26 31 954, attempts are already known to modify the composition of the austenitic steel, which is similar in its properties and is commercially available under the name "Type 316", in such a way that a reduced swelling under neutron bombardment is achieved. For this purpose, ratios between the contents of iron, chromium and nickel lying within a certain range are proposed, as well as elements which inhibit the formation of cavities, silicon in a concentration of 0.7 to 2% and titanium in a concentration of 0.1 to 0, 5%. Here, however, a basic alloy is assumed which contains 1.8 to 2.3% molybdenum. With the titanium content remaining the same, modifying the above-mentioned steel 1.4970 by increasing the silicon content with a slight increase in the molybdenum content was all the less obvious for the person skilled in the art, since V. Levy andain "Effect of Structure and Alloying Elements on void Formation in Austenitic Steels and Nickel Alloys "in ML Bleiberg / J.W. Bennett (ed.): "Radiation Effects in Breeder Reactor Structural Materials"; New York 1977 (709-725) had shown (Table 11) that with type 316 steel, an increase in the molybdenum content from 1 to 2% initially leads to an increase in volume swelling under neutron bombardment, these values again with a further increase in the molybdenum content lose weight.
Zur Lösung der oben genannten Aufgabe der Erfindung wird die im kennzeichnenden Teil des Patentanspruchs genannte Erhöhung des Silizium-und Molybdängehalts vorgeschlagen, die in der Herstellung des Stahls keine besondere Probleme aufwirft und die diesen in seinen mechanischen und chemischen Eigenschaften ansonsten gut untersuchten Stahl für die Verwendung als Werkstoff im Kernreaktorbau besser geeignet macht. Der Nachweis wurde dadurch gebracht, daß dieser Werkstoff im Vergleich zu dem Standardwerkstoff 1.4970 jeweils im kaltverformten Zustand mit Ni-lonen bestrahlt wurde und dabei ein deutlich geringeres Schwellen als der Standardwerkstoff zeigte.To achieve the above-mentioned object of the invention, the increase in the silicon and molybdenum content mentioned in the characterizing part of the patent claim is proposed, which does not pose any particular problems in the production of the steel and which steel is otherwise well examined for its use in its mechanical and chemical properties makes it more suitable as a material in nuclear reactor construction. The proof was provided by the fact that this material was irradiated with Ni ions in the cold-formed state in comparison to the standard material 1.4970 and showed a significantly lower threshold than the standard material.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82109616T ATE20908T1 (en) | 1981-11-02 | 1982-10-18 | AUSTENITIC STEEL WITH IMPROVED RESISTANCE TO NEUTRON-INDUCED SWELLING. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3143380A DE3143380C2 (en) | 1981-11-02 | 1981-11-02 | Austenitic steel with improved resistance to neutron-induced swelling |
DE3143380 | 1981-11-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0078440A2 EP0078440A2 (en) | 1983-05-11 |
EP0078440A3 EP0078440A3 (en) | 1984-02-08 |
EP0078440B1 true EP0078440B1 (en) | 1986-07-23 |
Family
ID=6145380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82109616A Expired EP0078440B1 (en) | 1981-11-02 | 1982-10-18 | Austenitic steel with resistance to neutron induced swelling |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0078440B1 (en) |
JP (1) | JPS5884962A (en) |
AT (1) | ATE20908T1 (en) |
DE (1) | DE3143380C2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2588630C (en) | 2004-11-19 | 2013-08-20 | Tivo Inc. | Method and apparatus for secure transfer of previously broadcasted content |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB733510A (en) * | 1952-01-14 | 1955-07-13 | Reinhard Straumann | Improvements in the manufacture of watch and like springs |
GB993613A (en) * | 1963-11-22 | 1965-06-02 | Sandvikens Jernverks Ab | Alloy steels and articles made therefrom |
US4011133A (en) * | 1975-07-16 | 1977-03-08 | The United States Of America As Represented By The United States Energy Research And Development Administration | Austenitic stainless steel alloys having improved resistance to fast neutron-induced swelling |
FR2394618A1 (en) * | 1977-06-13 | 1979-01-12 | Commissariat Energie Atomique | AUSTENITIC STAINLESS STEEL |
DE3070736D1 (en) * | 1980-01-09 | 1985-07-11 | Westinghouse Electric Corp | Austenitic iron base alloy |
DE3020844C2 (en) * | 1980-06-02 | 1984-05-17 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Use of high-temperature, corrosion-resistant, austenitic iron-nickel-chromium alloys with high long-term stability |
-
1981
- 1981-11-02 DE DE3143380A patent/DE3143380C2/en not_active Expired
-
1982
- 1982-10-18 AT AT82109616T patent/ATE20908T1/en not_active IP Right Cessation
- 1982-10-18 EP EP82109616A patent/EP0078440B1/en not_active Expired
- 1982-11-01 JP JP57192342A patent/JPS5884962A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0078440A3 (en) | 1984-02-08 |
JPS5884962A (en) | 1983-05-21 |
EP0078440A2 (en) | 1983-05-11 |
DE3143380C2 (en) | 1986-04-30 |
ATE20908T1 (en) | 1986-08-15 |
DE3143380A1 (en) | 1983-05-11 |
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