EP0037446B1 - Alliage austénitique à base de fer - Google Patents

Alliage austénitique à base de fer Download PDF

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Publication number
EP0037446B1
EP0037446B1 EP19800303047 EP80303047A EP0037446B1 EP 0037446 B1 EP0037446 B1 EP 0037446B1 EP 19800303047 EP19800303047 EP 19800303047 EP 80303047 A EP80303047 A EP 80303047A EP 0037446 B1 EP0037446 B1 EP 0037446B1
Authority
EP
European Patent Office
Prior art keywords
alloy
stainless steel
aisi type
iron base
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
Application number
EP19800303047
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German (de)
English (en)
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EP0037446A1 (fr
Inventor
Michael Karl Korenko
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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Publication date
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Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0037446A1 publication Critical patent/EP0037446A1/fr
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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
    • C22C38/44—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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • This invention relates to austenitic iron base alloys which find particular use in nuclear reactors and are characterized by improved swelling resistance and phase stability in both the annealed as well as the cold work condition in comparison with an AISI type 316 stainless steel.
  • the AISI type 316 stainless steel because of its austenitic character and which is strengthened through a solid solution strengthening addition would prove to be ideally suited for use in a nuclear reactor.
  • This conclusion was supported by the fact that the AISI type 316 stainless steel appeared to possess the desired strength characteristics at elevated temperatures. It was soon found however that even after low fluid reactor irradiation copious amounts radiation induced precipitation were evident in the microstructure and the material was subjected to relatively high swelling. It therefore became apparent that it was necessary to alter the chemical composition AISI type 316 stainless steel in an attempt to eliminate the phase instabilities and to provide improved swelling resistance without seriously adversely affecting the strength characteristics of the fundamental alloy. To this end, the alloys of the present invention appear to fulfill these primary requisites.
  • the present invention resides in an austenitic iron base alloy having improved structural stability and swelling resistance compared to AISI type 316 stainless steel and which alloy is suitable for use in an atmosphere subject to neutron irradiation, characterized in that said alloy consists of from 14% to 16.5% nickel, from 12% to 14% chromium, from 1.2% to 1.7% molybdenum, from 0.5% to 1.1 % silicon, from 0.5% to 2.5% manganese, up to 0.1% zirconium, from 0.15% to 0.5% titanium, from 0.02% to 0.1% carbon, up to 0.01% boron and the balance iron with incidental impurities.
  • the desired properties can be achieved by lowering the amounts of chromium, and molybdenum and by raising the amount of nickel while still maintaining the austenitic characteristic of the alloy when the same is subjected to elevated temperature irradiation of the type normally found, for example, in the case of fuel pins in a nuclear reactor. More specifically, the alloy will exhibit improved swelling resistance at elevated temperatures in both the annealed as well as the cold work condition.
  • Table 1 set forth hereinafter lists the chemical composition of the AISI type 316 stainless steel as well as the broad range, the preferred range, and the specific composition of a heat falling within the broad ranges as set forth herein.
  • the alloy of the present invention has less chromium, more nickel, and less molybdenum than that of a corresponding AISI type 316 stainless steel. Moreover, as can be seen from Table 1 the large reduction of the chromium together with a smaller reduction of the molybdenum and a small increase in the nickel is effective for maintaining the austenitic character of this alloy which austenitic character is strengthened by means of the molybdenum addition thereto. Note in particular that since the titanium and zirconium contents are quite limited, the microstructure of the alloy remains substantially precipitation free after extended exposures to the influence of neutron irradiation at elevated temperatures.
  • Figure 1 In order to more clearly and graphically depict the improvement in swelling resistance exhibited by the alloy of the present invention, attention is directed to Figure 1 which directly compares a solution annealed AISI type 316 stainless steel and the alloy of this invention having the composition of heat number 5976 as identified in Table 1 and the effect of the temperature at various fluence values in relation to the percent swelling.
  • Curve 10 of Figure 1 is a plot of the AISI type 316 stainless steel material whereas curve 12 is a plot of the identical values exhibited by the alloy of the present invention in the solution annealed condition which alloy has been arbitrarily designated D9B1.
  • the alloy of the present invention has far superior swelling resistance to that exhibited by the AISI type 316 stainless steel.
  • the curve 20 illustrates the data for AISI type 316 stainless steel in the 20% cold work condition and curve 22 shows the swelling resistance of alloy D9B1 in the 25% cold work condition. It is also believed significant to point out that in the cold work condition, the alloy of the present invention is still densifying while the AISI type 316 stainless steel is into the void swelling regiment regardless of the temperatures employed. Thus, these data make it clear that the alloys of the present invention are particularly suitable for use for example in a fast breeder reactor.

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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)

Claims (2)

1. Alliage austénitique à base de fer présentant une stabilité structurelle et une résistance au gonflement améliorées par rapport à celles de l'acier inoxydable du type AISI 316, cet alliage étant propre à être utilisé dans une atmosphère soumise à l'irradiation par neutrons, alliage caractérisé en ce qu'il est constitué de 14 à 16,5% de nickel, 12 à 14% de chrome, 1,2 à 1,7% de molybdène, 0,5 à 1,1 % de silicium, 0,5 à 2,5% de manganèse, jusqu'à 0,1% de zirconium, 0,15 à 0,5% de titane, 0,02 à 0,1% de carbone, jusqu'à 0,01% de bore, le reste étant du fer avec des impuretés accidentelles.
2. Alliage selon la revendication 1, caractérisé en ce qu'il est constitué par 15,25 à 15,75% de nickel, 13,25 à 13,75% de chrome, 1,4 à 1,6% de molybdène, 0,9 à 1,1% de silicium, 1,8 à 2,5% de manganèse, 0,04 à 0,06% de zirconium, 0,2 à 0,3% de titane, 0,03 à 0,04% de carbone, jusqu'à 0,01 % de bore, le reste étant du fer avec des impuretés accidentelles.
EP19800303047 1980-01-09 1980-09-02 Alliage austénitique à base de fer Expired EP0037446B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11052580A 1980-01-09 1980-01-09
US110525 1998-07-06

Publications (2)

Publication Number Publication Date
EP0037446A1 EP0037446A1 (fr) 1981-10-14
EP0037446B1 true EP0037446B1 (fr) 1985-06-05

Family

ID=22333507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800303047 Expired EP0037446B1 (fr) 1980-01-09 1980-09-02 Alliage austénitique à base de fer

Country Status (3)

Country Link
EP (1) EP0037446B1 (fr)
JP (1) JPS5698460A (fr)
DE (1) DE3070736D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3143380C2 (de) * 1981-11-02 1986-04-30 INTERATOM GmbH, 5060 Bergisch Gladbach Austenitischer Stahl mit verbesserter Widerstandsfähigkeit gegen Neutroneninduziertes Schwellen
US4421572A (en) * 1982-03-18 1983-12-20 The United States Of America As Represented By The United States Department Of Energy Thermomechanical treatment of alloys
US4576641A (en) * 1982-09-02 1986-03-18 The United States Of America As Represented By The United States Department Of Energy Austenitic alloy and reactor components made thereof
US4530719A (en) * 1983-04-12 1985-07-23 Westinghouse Electric Corp. Austenitic stainless steel for high temperature applications
JPS6187853A (ja) * 1984-09-28 1986-05-06 Kobe Steel Ltd 高速増殖炉炉心構造材料用オ−ステナイト・ステンレス鋼
DE3902634A1 (de) * 1989-01-30 1990-08-02 Kernforschungsz Karlsruhe Austenitischer stahl mit verbesserter widerstandsfaehigkeit gegen neutroneninduziertes schwellen und heliumversproedung
FR2790089B1 (fr) * 1999-02-23 2001-05-25 Commissariat Energie Atomique Procede de controle et/ou de prevision des proprietes physiques et/ou mecaniques et/ou chimiques d'un alliage metallique
SE0102102D0 (sv) * 2001-06-13 2001-06-13 Hoeganaes Ab High density stainless steel products and method for the preparation thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4158606A (en) * 1977-01-27 1979-06-19 The United States Department Of Energy Austenitic stainless steel alloys having improved resistance to fast neutron-induced swelling

Also Published As

Publication number Publication date
EP0037446A1 (fr) 1981-10-14
DE3070736D1 (en) 1985-07-11
JPS5698460A (en) 1981-08-07

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