EP0078440A2 - Austenitic steel with resistance to neutron induced swelling - Google Patents

Austenitic steel with resistance to neutron induced swelling Download PDF

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Publication number
EP0078440A2
EP0078440A2 EP82109616A EP82109616A EP0078440A2 EP 0078440 A2 EP0078440 A2 EP 0078440A2 EP 82109616 A EP82109616 A EP 82109616A EP 82109616 A EP82109616 A EP 82109616A EP 0078440 A2 EP0078440 A2 EP 0078440A2
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EP
European Patent Office
Prior art keywords
content
austenitic steel
steel
resistance
silicon
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
EP82109616A
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German (de)
French (fr)
Other versions
EP0078440A3 (en
EP0078440B1 (en
Inventor
Gert Dr. Knoblauch
Wolfgang Dipl.-Ing. Dietz
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.)
Interatom Internationale Atomreaktorbau GmbH
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Interatom Internationale Atomreaktorbau GmbH
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Application filed by Interatom Internationale Atomreaktorbau GmbH filed Critical Interatom Internationale Atomreaktorbau GmbH
Priority to AT82109616T priority Critical patent/ATE20908T1/en
Publication of EP0078440A2 publication Critical patent/EP0078440A2/en
Publication of EP0078440A3 publication Critical patent/EP0078440A3/en
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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

Definitions

  • the present invention relates to an austenitic, stainless steel according to the preamble of the claim.
  • a steel is commercially available under the name 1.4970, the silicon content being between ⁇ , 30 and 0.55% (here and below 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 given, 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.
  • this steel Under the influence of such neutron radiation and at temperatures of 400 ° C and above, as can be achieved in reactors operated with liquid metal as a coolant, this steel, like other materials, also exhibits a threshold which is attributed to the fact that changes are caused by the fast neutrons caused in the microstructure, 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.
  • the object of the present invention is to improve the swelling behavior of austenitic steels of the ge named type 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 is achieved under neutron bombardment.
  • ratios between the contents of iron, chromium and nickel lying within a certain range are proposed, as well as silicon in a concentration of 0.7 to 2% and titanium in a concentration of 0.1 to 0 as elements which inhibit the formation of cavities , 5%.

Abstract

1. Austenitic steel having a content (in percent by weight) of chromium and nickel of in each case 14.5 to 15.5%, a carbon content of 0.08 to 0.12%, a titanium content of 0.33 to 0.55%, a manganese content of at most 2% and admixtures of silicon and molybdenum, residual iron and impurities, characterised in that the silicon content is 0.55 to 1.0% and the molybdenum content is 1.4 to 1.5%.

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 ∅,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 ∅, 30 and 0.55% (here and below all data in percent by weight) and the molybdenum content being 1.0 to 1.4%. For this steel, maximum levels of phosphorus, sulfur, calcium, copper, cobalt, tantalum, vanadium and nitrogen are also given, 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 can be achieved in reactors operated with liquid metal as a coolant, this steel, like other materials, also exhibits a threshold which is attributed to the fact that changes are caused by the fast neutrons caused in the microstructure, 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 airh 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 Seiten 709 bis 725, gezeigt hatten, (Tabelle II), 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 gesteigertem Molybdängehalt -wieder abnehmen.The object of the present invention is to improve the swelling behavior of austenitic steels of the ge named type 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 is achieved under neutron bombardment. For this purpose, ratios between the contents of iron, chromium and nickel lying within a certain range are proposed, as well as silicon in a concentration of 0.7 to 2% and titanium in a concentration of 0.1 to 0 as elements which inhibit the formation of cavities , 5%. Here, however, a basic alloy is assumed, which contains 1.8 to 2.3% molybdenum airh. 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 uain "Effect of Structure and Alloying Elements on Void Formation in Austenitic Steels and Nickel Alloys "in ML Bleiberg / JW Bennett (ed.):" Radiation Effects in Breeder Reactor Structural Materials "; New York 1977 pages 709 to 725, (Table II) had shown that with type 316 steel an increase in the molybdenum content of 1 to 2% initially leads to an increase in the volume swelling under neutron bombardment, these values decreasing again with a further increase in the molybdenum content.

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-Ionen bestrahlt wurde und dabei ein deutlich ge-. ringeres Schwellen als der Standardwerkstoff zeigte.To achieve the above object of the invention is proposed said in the characterizing part of claim .Erhöhung of silicon and M olybdängehalts posing in the manufacturing of the steel is no particular problems and these otherwise well-studied in mechanical and chemical properties of steel for makes the use as a material in nuclear reactor construction more suitable. The proof was brought about 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 thereby clearly less swelling than the standard material showed.

Claims (1)

Austenitischer Stahl mit einem Gehalt (in Gewichtsprozent) an Chrom und Nickel von je 14,5 bis 15,5 %, einem Kohlenstoffgehalt von 0,08 bis 0,12 %, einem Titangehalt von 0,33 bis 0,55 %, einem Mangangehalt von höchstens 2 % und Beimengungen von Silizium und Molybdän, gekennzeichnet durch folgendes Merkmal: a) Der Gehalt an Silizium beträgt 0,55 bis 1,0 %, vorzugsweise 1,0 % und derjenige an Molybdän 1,4 bis 1,5 %, vorzugsweise 1,5 %.Austenitic steel with a content (in percent by weight) of chromium and nickel of 14.5 to 15.5%, a carbon content of 0.08 to 0.12%, a titanium content of 0.33 to 0.55%, a manganese content of at most 2% and admixtures of silicon and molybdenum, characterized by the following feature: a) the content of silicon is 0.55 to 1.0%, preferably 1.0% and that of molybdenum is 1.4 to 1.5%, preferably 1.5%.
EP82109616A 1981-11-02 1982-10-18 Austenitic steel with resistance to neutron induced swelling Expired EP0078440B1 (en)

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 true EP0078440A2 (en) 1983-05-11
EP0078440A3 EP0078440A3 (en) 1984-02-08
EP0078440B1 EP0078440B1 (en) 1986-07-23

Family

ID=6145380

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EP82109616A Expired EP0078440B1 (en) 1981-11-02 1982-10-18 Austenitic steel with resistance to neutron induced swelling

Country Status (4)

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EP (1) EP0078440B1 (en)
JP (1) JPS5884962A (en)
AT (1) ATE20908T1 (en)
DE (1) DE3143380C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10440342B2 (en) 2004-11-19 2019-10-08 Tivo Solutions Inc. Secure transfer of previously broadcasted content

Citations (6)

* Cited by examiner, † Cited by third party
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
FR2318237A1 (en) * 1975-07-16 1977-02-11 Us Energy AUSTENITIC ALLIED STEELS WITH INCREASED RESISTANCE TO SWELLING PRODUCED BY RAPID NEUTRONS
FR2394618A1 (en) * 1977-06-13 1979-01-12 Commissariat Energie Atomique AUSTENITIC STAINLESS STEEL
EP0037446A1 (en) * 1980-01-09 1981-10-14 Westinghouse Electric Corporation Austenitic iron base alloy
FR2483467A1 (en) * 1980-06-02 1981-12-04 Kernforschungsz Karlsruhe HIGHLY REFRACTORY FER-NICKEL-CHROME AUSTENITIC ALLOYS ALSO RESISTANT TO NEUTRON SWELLING AND CORROSION IN LIQUID SODIUM

Patent Citations (6)

* Cited by examiner, † Cited by third party
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
FR2318237A1 (en) * 1975-07-16 1977-02-11 Us Energy AUSTENITIC ALLIED STEELS WITH INCREASED RESISTANCE TO SWELLING PRODUCED BY RAPID NEUTRONS
FR2394618A1 (en) * 1977-06-13 1979-01-12 Commissariat Energie Atomique AUSTENITIC STAINLESS STEEL
EP0037446A1 (en) * 1980-01-09 1981-10-14 Westinghouse Electric Corporation Austenitic iron base alloy
FR2483467A1 (en) * 1980-06-02 1981-12-04 Kernforschungsz Karlsruhe HIGHLY REFRACTORY FER-NICKEL-CHROME AUSTENITIC ALLOYS ALSO RESISTANT TO NEUTRON SWELLING AND CORROSION IN LIQUID SODIUM

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10440342B2 (en) 2004-11-19 2019-10-08 Tivo Solutions Inc. Secure transfer of previously broadcasted content

Also Published As

Publication number Publication date
EP0078440A3 (en) 1984-02-08
JPS5884962A (en) 1983-05-21
EP0078440B1 (en) 1986-07-23
DE3143380C2 (en) 1986-04-30
ATE20908T1 (en) 1986-08-15
DE3143380A1 (en) 1983-05-11

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