EP0056480A2
Expired / Lapsed
EP
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Use of nickel base alloy having high resistance to stress corrosion cracking
Assignee: Hitachi Ltd
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Filing: 1981-12-22
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Granted: —
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Expires: 2001-12-22
Abstract
Abstract A member adapted for use under a stress in an atmosphere of a temperature below the creep temperature and made from an Ni base alloy having a high resistance to stress corrosion cracking. The Ni alloy consists essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni, and has an austenite matrix in which precipitated is at least one of y' phase and y" phase. The member can suitably used as parts which are subjected to pure water in nuclear reactor.
Inventors
- 👤 Shigeo Hattori
- 👤 Rikizo Watanabe
- 👤 Yasuhiko Mori
- 👤 Isao Masaoka
- 👤 Ryoichi Sasaki
- 👤 Hisao Itow
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:35
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
87 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking and used under a stress in an atmosphere of a temperature below the creep temperature, characterized in that said Ni base alloy consists essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni, and has an austenite matrix containing at least one of y' phase and y" phase.
Claim 2
Dependent Claim
87 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking and used under a stress in an atmosphere of a temperature below the creep temperature, characterized in that said Ni base alloy consists essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni, and has an austenite matrix containing at least one of y' phase and y" phase.
Claim 3
Dependent Claim
39 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 1, wherein said member is used in a nuclear reactor and subjected to a pure water as said atmosphere.
Claim 4
Dependent Claim
40 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 1 or 2, wherein the Al content, Ti content and the Nb content are selected to meet the following condition:
Claim 5
Dependent Claim
109 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking and used under a stress in an atmosphere of a temperature below the creep temperature, characterized in that said alloy consists essentially of, by weight, less than 0.08% of C, less than 1% of Si, less than 1% of Mn, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of A1, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb, less than 40% of Fe and the balance more than 40% of Ni, and has an austenite matrix containing at least one of y' phase and y" phase.
Claim 6
Dependent Claim
109 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking and used under a stress in an atmosphere of a temperature below the creep temperature, characterized in that said alloy consists essentially of, by weight, less than 0.08% of C, less than 1% of Si, less than 1% of Mn, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of A1, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb, less than 40% of Fe and the balance more than 40% of Ni, and has an austenite matrix containing at least one of y' phase and y" phase.
Claim 7
Dependent Claim
39 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 4, wherein said member is used in a nuclear reactor and subjected to a pure water as said atmosphere.
Claim 8
Dependent Claim
40 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 4 or 5, wherein the Al content, Ti content and the Nb content are selected to meet the following condition:
Claim 9
Dependent Claim
72 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in any one of claims 4 to 6, wherein said Ni base alloy consists essentially of, by weight, 17 to 23% of Cr, 1.5 to 5% of Mo, 5 to 25% of Fe, 0.4 to 1.5% of Al, 0.7 to 2% of Ti, 1 to 4% of Nb and more than 50% of Ni.
Claim 10
Dependent Claim
54 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in any one of claims 2, 3, 5, 6 and 7, wherein said member is a finger spring disposed between a tie plate of a nuclear fuel assembly and a fuel channel in a nuclear reactor.
Claim 11
Dependent Claim
62 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in any one of claims 2, 3, 5, 6 and 7, wherein said member is an expansion spring consisting of a leaf spring and adapted for fixing a graphite seal of a fuel rod driving mechanism to an index tube in a nuclear reactor.
Claim 12
Dependent Claim
51 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in any one of claims 2, 3, 5, 6 and 7, wherein said member is a retainer beam for pressing and retaining an elbow pipe of a jet pump in a nuclear reactor.
Claim 13
Dependent Claim
62 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in any one of claims 2, 3, 5, 6 and 7, wherein said member is a garter spring consisting of a coiled spring and adapted for fixing a graphite seal of a fuel rod driving mechanism to a piston tube in a nuclear reactor.
Claim 14
Dependent Claim
56 words
A member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in any one of claims 2, 3, 5, 6 and 7, wherein said member is a cap screw consisting of a bolt for fixing a spring to a guard of a nuclear fuel assembly in a nuclear reactor.
Claim 15
Independent Claim
149 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking and adapted for use under a stress in an atmosphere of a temperature below the creep temperature, said method comprises the steps of: making by a vacuum melting an ingot of an alloy consisting essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni; effecting a plastic work on said ingot by repeatedly subjecting said ingot to a hot forging and diffusion treatment (soaking); forming said ingot into a member of desired form; and subjecting the formed member to a solution heat treatment and then to an aging treatment to cause a precipitation of at least one of y' phase and y" phase in austenite matrix.
Claim 16
Independent Claim
149 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking and adapted for use under a stress in an atmosphere of a temperature below the creep temperature, said method comprises the steps of: making by a vacuum melting an ingot of an alloy consisting essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni; effecting a plastic work on said ingot by repeatedly subjecting said ingot to a hot forging and diffusion treatment (soaking); forming said ingot into a member of desired form; and subjecting the formed member to a solution heat treatment and then to an aging treatment to cause a precipitation of at least one of y' phase and y" phase in austenite matrix.
Claim 17
Dependent Claim
33 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 13, wherein said vacuum melting is effected two times.
Claim 18
Independent Claim
139 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking and adapted for use under a stress in an atmosphere of a temperature below the creep temperature, said method comprises the steps of: producing a blank material of an alloy consisting essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni; subjecting said blank material to a cold plastic work after subjecting it to a solution heat treatment; forming said blank material into a member of desired form; and subjecting the formed member to an aging treatment to cause a precipi tation of at least one of y' phase and y" phase in the austenite matrix.
Claim 19
Independent Claim
139 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking and adapted for use under a stress in an atmosphere of a temperature below the creep temperature, said method comprises the steps of: producing a blank material of an alloy consisting essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni; subjecting said blank material to a cold plastic work after subjecting it to a solution heat treatment; forming said blank material into a member of desired form; and subjecting the formed member to an aging treatment to cause a precipi tation of at least one of y' phase and y" phase in the austenite matrix.
Claim 20
Independent Claim
127 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking and adapted for use under a stress in an atmosphere of a temperature below the creep temperature, said method comprises the steps of: producing a blank material of an alloy consisting essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni; die-forming said blank material into a member of desired shape after subjecting it to a solution heat treatment; and subjecting said member to an aging treatment to cause a precipitation of at least one of y' phase and y" phase in austenite matrix.
Claim 21
Independent Claim
127 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking and adapted for use under a stress in an atmosphere of a temperature below the creep temperature, said method comprises the steps of: producing a blank material of an alloy consisting essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni; die-forming said blank material into a member of desired shape after subjecting it to a solution heat treatment; and subjecting said member to an aging treatment to cause a precipitation of at least one of y' phase and y" phase in austenite matrix.
Claim 22
Dependent Claim
50 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 15, wherein said member is a finger plate disposed between a tie plate of a nuclear fuel assembly and a fuel channel in a nuclear reactor.
Claim 23
Dependent Claim
58 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 15, wherein said member is an expansion spring consisting of a leaf spring and adapted for fixing a graphite seal of a fuel rod driving mechanism to an index tube in a nuclear reactor.
Claim 24
Dependent Claim
50 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 13 or 14, wherein said member is a retainer beam adapted to press and retain an elbow pipe of a jet pump in a nuclear reactor.
Claim 25
Dependent Claim
60 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 15 or 16, wherein said member is a garter spring consisting of a coiled spring and adapted for fixing a graphite seal of a fuel rod driving mechanism to a piston tube in a nuclear reactor.
Claim 26
Dependent Claim
55 words
A method of producing a member made from an Ni base alloy having a high resistance to stress corrosion cracking as claimed in claim 13 or 14, wherein said member is a cap screw consisting of a bolt adapted for fixing a spring to a guard of a nuclear fuel assembly in a nuclear reactor.
References Cited (Backward Citations)
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