EP0087609A1 - Alliage de coulée nickel-fer, résistant aux températures élevées et présentant une structure très stable - Google Patents

Alliage de coulée nickel-fer, résistant aux températures élevées et présentant une structure très stable Download PDF

Info

Publication number
EP0087609A1
EP0087609A1 EP83101057A EP83101057A EP0087609A1 EP 0087609 A1 EP0087609 A1 EP 0087609A1 EP 83101057 A EP83101057 A EP 83101057A EP 83101057 A EP83101057 A EP 83101057A EP 0087609 A1 EP0087609 A1 EP 0087609A1
Authority
EP
European Patent Office
Prior art keywords
alloy according
alloy
resistance
castings
nickel
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
EP83101057A
Other languages
German (de)
English (en)
Other versions
EP0087609B1 (fr
Inventor
Helmut Dr.-Ing. Brandis
Wolfgang Dr.-Ing. Spyra
Josef Reismann
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.)
Thyssen Stahl AG
Original Assignee
Thyssen Edelstahlwerke AG
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 Thyssen Edelstahlwerke AG filed Critical Thyssen Edelstahlwerke AG
Publication of EP0087609A1 publication Critical patent/EP0087609A1/fr
Application granted granted Critical
Publication of EP0087609B1 publication Critical patent/EP0087609B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • 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
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S376/00—Induced nuclear reactions: processes, systems, and elements
    • Y10S376/90—Particular material or material shapes for fission reactors

Definitions

  • the invention relates to a high-temperature, cobalt-free nickel-iron casting alloy which is insensitive to temperature changes and has great thermodynamic stability of the structural components, which also has high thermal hardness, excellent resistance to oxidation, corrosion and wear, and good welding properties and is particularly suitable as a material for nuclear reactor components.
  • alloys that can be used for example, in the flange area of nuclear reactors, the following limit values are required for certain accompanying elements: Co ⁇ 0.1%, B ⁇ 0.01%, Ta ⁇ 0.002%.
  • Iron-based alloys can generally only be used to a limited extent due to their low heat resistance and lack of corrosion resistance.
  • Nickel-chromium-boron-silicon alloys cannot be considered due to their insufficient toughness and corrosion resistance, so that their advantages, such as a low melting temperature range, cannot be exploited.
  • From DE-PS 27 14 674 is a suitable nickel-based alloy for nuclear reactor components with 0.2 to 1.9% C, 18 to 32% Cr, 1.5 to 8% W, 6 to 12% Mo and optional additives of up to 2% Si, each up to 3% Mn, Nb / Ta, Zr, V and up to 0.9% B, rest 15 to 40% Ni with good cold and warm hardness, good corrosion resistance and friction properties as well as weldability and high fatigue strength .
  • the object of the invention is to propose a structurally stable, heat-resistant nickel-iron cast alloy which, with otherwise the same good properties as that of the aforementioned alloy according to DE-PS 27 14 674, has better scale resistance similar to that of cobalt alloys.
  • the invention differs in a lack of tungsten content and an increased molybdenum content. Tungsten is comparatively more expensive and more uncertainly available than molybdenum. Furthermore, the known alloy can be iron-free or have a maximum content of 59.3% Fe, while in the alloy according to the invention the iron content is narrowly limited at 18 to 26% with a view to achieving the required properties. The same applies to the chromium content, which must be present in amounts of 22 to 26%. Chromium dissolved in the mixed crystal primarily ensures great resistance to oxidation and corrosion, while the chromium bonded in the carbide also determines the wear resistance. For reasons of toughness, the formation of coarse primary carbides was counteracted by the upper limit of the chromium content. Higher chromium levels also deteriorate welding behavior in an unacceptable manner.
  • Molybdenum in amounts of 12.5 to 14.5% in the alloy according to the invention when it is dissolved in the mixed crystal, improves the heat resistance and corrosion resistance and, in the carbide, the wear resistance.
  • DE-PS 27 14 674 does not reveal the knowledge on which the invention is based, that by carefully limiting the mutually influencing elements nickel, iron, chromium and molybdenum, the catastrophic oxidation otherwise frequently observed on materials containing high molybdenum due to the formation of volatile oxides is omitted. It was therefore not foreseeable that by exceeding the maximum content for molybdenum of 12% specified in DE-PS 27 14 674, not only the same but also significantly improved scale resistance can be achieved.
  • the carbon required for carbide formation has to meet a minimum value to achieve good perspiration properties and is limited to a maximum value of 1.6% in order to avoid the formation of coarse primary carbides and to ensure sufficient hardness.
  • the effective carbon content according to the formula is also of particular importance should be between 1.1 and 1.6.
  • the hardness reaches a maximum value with an effective carbon content of approximately 1.3% (FIG. 1).
  • Manganese serves as a deoxidizing and desulfurizing agent, but is limited to a maximum of 0.2% in order to avoid pore formation in the casting or weld metal.
  • Silicon increases the corrosion resistance in acidic reduced solutions and promotes the flow behavior in the liquid phase.
  • Niobium / tantalum is added to refine the grain.
  • the shape of the special carbides is controlled by suitable deoxidizing agents such as calcium, magnesium, aluminum, zirconium and rare earth metals.
  • the structure of the alloy according to the invention consists of primary dendrites with a structure centered on the cubic surface and residual melting neectectic, which is composed of mixed crystals and carbides of the types M 7 C 3 and M 6 C.
  • the alloy according to the invention has a surprisingly high thermodynamic stability between 350 and 600 ° C.
  • Fig. 2 shows this.
  • FIG. 2a shows the structure in 1000 times magnification for the rapidly quenched casting state
  • FIG. 2b shows the structure state after a subsequent 1000-hour annealing at 600 ° C. Changes in structure are imperceptible.
  • the composition of the alloy according to the invention used in the tests shown in FIGS. 1 to 3 (in% by weight) was as follows: The structural stability is confirmed by hardness measurements.
  • the hardness of cast and TIG weld metal was determined between staggered annealing between 350 and 600 ° C. 3 shows the relatively narrow scatter band of hardness with values between 45 and 48 HRC for annealing times up to 1000 h.
  • the hardness is accordingly determined by the primary structure of the alloy according to the invention. Aging processes do not show up to 600 ° C in the course of hardness.
  • the alloy according to the invention was tested with the commercially available cobalt-based alloy, material no. 3177.0 compared.
  • the materials examined had the following composition:
  • FIG. 4 shows that the alloy according to the invention has a superior warm hardness up to at least 900 ° C. compared to the known cobalt alloy.
  • the comparatively large resistance to deformation at high temperature is characteristic of the heat resistance of the alloy according to the invention.
  • the resistance to temperature changes is favorably influenced by a large modulus of elasticity and a small coefficient of expansion (Fig. 5).
  • the nickel alloy according to the invention has a smaller coefficient of expansion and a greater modulus of elasticity than the known cobalt alloy used for comparison.
  • the resistance of the claimed nickel alloy to oxidation is high, as shown in FIG. 6.
  • the oxidation behavior of the new alloy up to 900 ° C is the same as that of the cobalt alloy.
  • the commercially available alloy according to DE-PS 27 14 674 has a tendency to catastrophic oxidation, as can be seen from the sharp increase in oxidation above 800 ° C.
  • a comparison of corrosion values can be found in the following table.
  • the test results show that the nickel alloy according to the invention is superior to the cobalt comparison alloy in terms of resistance to sulfuric acid and hydrochloric acid.
  • the alloy according to the invention is particularly well suited for nuclear reactor components and for armoring valves.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Arc Welding In General (AREA)
  • Heat Treatment Of Steel (AREA)
EP83101057A 1982-02-27 1983-02-04 Alliage de coulée nickel-fer, résistant aux températures élevées et présentant une structure très stable Expired EP0087609B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3207162A DE3207162C1 (de) 1982-02-27 1982-02-27 Hochwarmfeste Nickel-Eisen-Gusslegierung mit grosser Gefuegestabilitaet
DE3207162 1982-02-27

Publications (2)

Publication Number Publication Date
EP0087609A1 true EP0087609A1 (fr) 1983-09-07
EP0087609B1 EP0087609B1 (fr) 1985-09-25

Family

ID=6156913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101057A Expired EP0087609B1 (fr) 1982-02-27 1983-02-04 Alliage de coulée nickel-fer, résistant aux températures élevées et présentant une structure très stable

Country Status (4)

Country Link
US (1) US4464335A (fr)
EP (1) EP0087609B1 (fr)
CA (1) CA1208043A (fr)
DE (1) DE3207162C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8297046B2 (en) 2003-01-02 2012-10-30 Daimler Ag Exhaust gas aftertreatment installation and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547338A (en) * 1984-12-14 1985-10-15 Amax Inc. Fe-Ni-Cr corrosion resistant alloy
US8613886B2 (en) * 2006-06-29 2013-12-24 L. E. Jones Company Nickel-rich wear resistant alloy and method of making and use thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB647701A (en) * 1944-02-24 1950-12-20 William Jessop And Sons Ltd Improvements in and relating to nickel chromium steels
GB670555A (en) * 1946-04-12 1952-04-23 Jessop William & Sons Ltd Improvements in or relating to nickel-chromium steels
FR2129518A5 (fr) * 1971-03-09 1972-10-27 Kobe Steel Ltd
FR2346462A1 (fr) * 1976-04-02 1977-10-28 Commissariat Energie Atomique Super alliage a haute endurance sans cobalt applicable notamment dans l'industrie nucleaire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5517403A (en) * 1978-07-24 1980-02-06 Hitachi Ltd Sliding mechanism for control rod

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB647701A (en) * 1944-02-24 1950-12-20 William Jessop And Sons Ltd Improvements in and relating to nickel chromium steels
GB670555A (en) * 1946-04-12 1952-04-23 Jessop William & Sons Ltd Improvements in or relating to nickel-chromium steels
FR2129518A5 (fr) * 1971-03-09 1972-10-27 Kobe Steel Ltd
FR2346462A1 (fr) * 1976-04-02 1977-10-28 Commissariat Energie Atomique Super alliage a haute endurance sans cobalt applicable notamment dans l'industrie nucleaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8297046B2 (en) 2003-01-02 2012-10-30 Daimler Ag Exhaust gas aftertreatment installation and method
US9057307B2 (en) 2003-01-02 2015-06-16 Daimler Ag Exhaust gas aftertreatment installation and method

Also Published As

Publication number Publication date
US4464335A (en) 1984-08-07
EP0087609B1 (fr) 1985-09-25
DE3207162C1 (de) 1983-10-06
CA1208043A (fr) 1986-07-22

Similar Documents

Publication Publication Date Title
DE602006000160T2 (de) Hitzbeständige Legierung für bei 900oC nachhaltige Auslassventile und Auslassventile aus dieser Legierung
DE19941411B4 (de) Turbinen- oder Kesselbauteil
DE102005027258A1 (de) Hochkohlenstoffhaltiger Stahl mit Superplastizität
DE2714674C3 (de) Superlegierung mit hoher Dauerfestigkeit
DE3300392C2 (fr)
DE60103410T2 (de) Preiswerte, korrosions- und hitzebeständige Legierung für Diesel-Brennkraftmaschine
DE1231018B (de) Verwendung einer warmfesten, rostfreien Stahllegierung
EP1188845A1 (fr) Alliage à base de nickel pour des utilisiations à haute température
DE2741271A1 (de) Superlegierung auf nickelbasis sowie gusskoerper daraus
DE3306824A1 (de) Oxidationsbestaendige nickellegierung
DE2752529A1 (de) Nickellegierung
DE2534786A1 (de) Nickel-chrom-wolfram-legierungen
DE3503110C2 (fr)
DE3490022T1 (de) Legierungen auf Cobaltbasis für Motorventile und Ventilsitze
DE69907982T2 (de) Werkstoffe zum Schweissen von Stahl mit hohem Chromgehalt
DE3903682A1 (de) Durch stickstoff verfestigte fe-ni-cr-legierung
DE2311998B2 (de) Verwendung einer nickellegierung fuer bauteile mit hoher zeitstandfestigkeit
DE2420362C3 (de) Verwendung einer mischkristallgehärteten Legierung
EP2976441A1 (fr) Alliage à mémoire de forme à base de fer
DE3248134C2 (fr)
DE2830946A1 (de) Superlegierung auf nickelbasis und gegenstand daraus
DE2821524C2 (de) Verfahren zur Wärmebehandlung eines einkristallinen Körpers aus einer Nickel-Superlegierung
EP0087609B1 (fr) Alliage de coulée nickel-fer, résistant aux températures élevées et présentant une structure très stable
EP0609682B1 (fr) Alliage résistant à l'oxydation et à la corrosion, à base l'aluminiure de fer dopé et application de cet alliage
DE3736350C2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE FR GB IT

17P Request for examination filed

Effective date: 19831013

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE FR GB IT

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BERE Be: lapsed

Owner name: THYSSEN EDELSTAHLWERKE A.G.

Effective date: 19880228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881028

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881122

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST