EP0050282B1 - Alliage à base de nickel à protection contre la carburisation et la corrosion - Google Patents

Alliage à base de nickel à protection contre la carburisation et la corrosion Download PDF

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Publication number
EP0050282B1
EP0050282B1 EP81108147A EP81108147A EP0050282B1 EP 0050282 B1 EP0050282 B1 EP 0050282B1 EP 81108147 A EP81108147 A EP 81108147A EP 81108147 A EP81108147 A EP 81108147A EP 0050282 B1 EP0050282 B1 EP 0050282B1
Authority
EP
European Patent Office
Prior art keywords
corrosion
nickel
content
alloy
based alloy
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
EP81108147A
Other languages
German (de)
English (en)
Other versions
EP0050282A1 (fr
Inventor
Karl Dr. Brenner
Roger Dr. Cook
Michael Dr. Warren
Antony Bates
Graham Dr. Leslie
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.)
Ght Gesellschaft fur Hochtemperaturreaktor-Technik Mbh
Original Assignee
Ght Gesellschaft fur Hochtemperaturreaktor-Technik Mbh
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
Application filed by Ght Gesellschaft fur Hochtemperaturreaktor-Technik Mbh filed Critical Ght Gesellschaft fur Hochtemperaturreaktor-Technik Mbh
Publication of EP0050282A1 publication Critical patent/EP0050282A1/fr
Application granted granted Critical
Publication of EP0050282B1 publication Critical patent/EP0050282B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W

Definitions

  • the present invention relates to a nickel-based alloy according to the preamble of the first claim.
  • Nickel-based alloys are preferably used where high strength values must be guaranteed at elevated temperatures.
  • Such a use case is e.g. B. the helium-operated cooling circuit of a high-temperature nuclear reactor; the use of such reactors is being considered, inter alia, for coal refinement, e.g. B. the production of synthetic natural gas.
  • the alloys mentioned tend to carburize and to intergranular corrosion at high operating temperatures of 800-1000 ° C.
  • the property of aluminum is known to form a dense oxidation layer which inhibits further oxidation after its formation in an oxidizing atmosphere.
  • simply alloying aluminum to nickel-based alloys is not sufficient to lead to the formation of a protective oxide layer on the surface of workpieces made from such alloys. Rather, the aluminum oxide forms in the form of irregular particles below the surface, where it not only has no protective effect, but also favors corrosion.
  • the object of the invention is to provide an alloy composition which is capable of forming a continuous, dense oxide skin in an environment with low oxygen partial pressure and thus resists carburization and corrosion.
  • the alloy should also (in contrast to the last mentioned) have mechanical properties that allow components, e.g. B. to produce tubes for heat exchangers in nuclear reactor plants of the type described.
  • the protective layer-forming properties of the alloy should be in the entire temperature range of their use, i. H. from room temperature to about 1000 ° C.
  • the solution to this problem consists of an alloy which meets the features set out in the claim.
  • Test pieces made of this alloy were exposed to a helium atmosphere of 1.8 bar at temperatures of 850, 900 and 950 ° C for periods of up to 2000 hours each.
  • comparison pieces were made from a commercially available alloy with the composition exposed to these conditions.
  • a thin, continuous and uniform oxide layer of about 1 ⁇ m had formed on the pieces of the alloy according to the invention, which effectively prevented deeper corrosion of the material.
  • the comparison pieces on the other hand, showed irregular oxide particles reaching up to 50 ⁇ m deep. This does not provide corrosion protection. The same applies to protection against carburization.
  • the alloy according to the invention showed a carbon uptake of between 0.003 and 0.006 percent by weight, the comparison alloy that of 0.042 percent by weight.
  • test pieces as outlined above, were achieved without being subjected to a special surface treatment. Rather, it was sufficient to use a usually bare, e.g. B. ground or stained surface.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Claims (1)

  1. Alliage réfractaire à base de nickel constitué (toutes les indications sont données en pourcentage pondéral):
    a) d'une teneur en aluminium de 0,3 à 0,8% et d'une teneur en titane de 0,3 à 1,5%, le rapport du titane à l'aluminium étant supérieur à 1,
    b) d'une teneur en chrome de 3 à 10%,
    c) d'une teneur en manganèse inférieure à 0,1% et d'une teneur en silicium inférieure à 0,1%,
    d) d'une teneur en fer, cobalt, molybdène et/ou tungstène,
    e) le reste étant du nickel et des impuretés dues à la préparation.
EP81108147A 1980-10-18 1981-10-09 Alliage à base de nickel à protection contre la carburisation et la corrosion Expired EP0050282B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3039473 1980-10-18
DE19803039473 DE3039473A1 (de) 1980-10-18 1980-10-18 Aufkohlungs- und korrosionsgeschuetzte nickelbasislegierung

Publications (2)

Publication Number Publication Date
EP0050282A1 EP0050282A1 (fr) 1982-04-28
EP0050282B1 true EP0050282B1 (fr) 1985-02-13

Family

ID=6114736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108147A Expired EP0050282B1 (fr) 1980-10-18 1981-10-09 Alliage à base de nickel à protection contre la carburisation et la corrosion

Country Status (2)

Country Link
EP (1) EP0050282B1 (fr)
DE (2) DE3039473A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB870366A (en) * 1959-04-24 1961-06-14 Mond Nickel Co Ltd Improvements relating to nickel-molybdenum-iron alloys
BE621346A (fr) * 1961-08-11
US3591372A (en) * 1968-08-12 1971-07-06 Martin Metals Co Alloy stabilization
ZA74490B (en) * 1973-02-06 1974-11-27 Cabot Corp Nickel-base alloys
US4236943A (en) * 1978-06-22 1980-12-02 The United States Of America As Represented By The United States Department Of Energy Precipitation hardenable iron-nickel-chromium alloy having good swelling resistance and low neutron absorbence

Also Published As

Publication number Publication date
DE3039473A1 (de) 1982-06-09
DE3168928D1 (en) 1985-03-28
EP0050282A1 (fr) 1982-04-28

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