EP0109350A2
Expired / Lapsed
EP
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Nickel-chromium alloy
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1983-11-09
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Granted: —
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Expires: 2003-11-09
Abstract
Abstract The present invention provides a nickel-chromium alloy in which it has an excellent mechanical character and improves a pitting corrosion resistance, a stress corrosion cracking resistance and a crystal boundary etching resistance, and the Ni-Cr alloy is obtained by carrying out an annealing treatment under required conditions, said alloy having the following composition: in therms of % by weight, 40 - 70% of Ni; 0.015% or less of C; 1.0% or less of Si; 25 - 35% of Cr; 1.0% or less of Mn; 0.030% or less of P; 0.020% or less of S and the residue comprising Fe and impurities.
Inventors
- 👤 Toshio Takasago Technical Institute Yonezawa
- 👤 Nobuya Takasago Technical Institute Sasaguri
- 👤 Kichiro Takasago Technical Institute Onimura
- 👤 Hiroshi Takasago Technical Institute Susukida
- 👤 Katsuji Takasago Technical Institute Kawaguchi
- 👤 Takaya C/O Kobe Shipyard & Engine Works Kusakabe
- 👤 Hiroo Nagano
- 👤 Takao Minami
- 👤 Kazuo Yamanaka
- 👤 Yasutaka Okada
- 👤 Mamoru Inoue
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:54
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A nickel-chromium alloy characterized in that it is obtained by carrying out an annealing treatment under required conditions, said alloy having the following composition: in terms of % by weight, 25 - 35% of Cr; 40 - 70% of Ni; 1.0% or less of Mn; 0.015% or less of C; 0.030% or less of P; 1.0%=or less of Si; 0.020% or less of S and the residue comprising Fe and usual impurities.
Claim 2
Dependent Claim
72 words
A nickel-chromium alloy characterized in that it is obtained by carrying out an annealing treatment under required conditions, said alloy having the following composition: in terms of % by weight, 25 - 35% of Cr; 40 - 70% of Ni; 1.0% or less of Mn; 0.015% or less of C; 0.030% or less of P; 1.0%=or less of Si; 0.020% or less of S and the residue comprising Fe and usual impurities.
Claim 3
Dependent Claim
178 words
A nickel-chromium alloy according to claim 1 wherein said nickel based alloy for a material which will be subjected to a high-temperature and high-pressure water or vapor comprises, in terms of % by weight, 58% or more of Ni, 25 to 35% of Cr, 0.003% or less of B, 0.012 to 0.035% of C, 1% or less of Mn, 0.5% or less of Si, 0.015% or less of P, 0.015% or less of S, and the residue of Fe and usual impurities; in a first thermal treatment process, said nickel based alloy is heated and retained at a temperature of T°C (at which a carbide is thoroughly solubilized) to (T + 100)°C and is cooled at a cooling rate of a furnace cooling rate or more, and in a second thermal treatment process, said nickel based alloy is then retained at a temperature of 600 to 750°C and at a temperature within a sensitization recovery range for a period of 0.1 to 100 hours and is cooled at a cooling rate of said furnace cooling rate or more.
Claim 4
Dependent Claim
99 words
A nickel-chromium alloy according to claim 1 wherein said nickel-chromium alloy is obtained by carrying out an annealing treatment under required conditions, said alloy having the following composition: in terms of % by weight, 0.04% or less of C; 1.0% or less of Si; 1.0% or less of Mn; 0.030% or less of P; 0.02% or less of S; 40 to 70% of Ni; 25 to 35% of Cr; 0.1 to 0.5% of Al; 0.05 to 1.0% of Ti; 0.5 to 5.0% in all of one or more of Mo, W and V; and the residue comprising substantially Fe.
Claim 5
Dependent Claim
27 words
A nickel-chromium alloy according to claim 3 wherein said required conditions are in a range (Y) surrounded by points, A, B,C, D and E in Figure 4.
Claim 6
Dependent Claim
51 words
A nickel-chromium alloy according to claim 3 wherein said required conditions are that an annealing temperature for said annealing treatment is within the range of 900 to 975°C and said composition further includes 0.2 to 5.0% of Nb subject to Nb/C = 10 to 125 and Ti = 0.2 to 1.0%.
Claim 7
Dependent Claim
151 words
A nickel-chromium alloy for heat transfer pipes according to claim 1 wherein said nickel-chromium alloy is obtained by heating and retaining said alloy at a temperature within the range of a temperature (T°C), at which a carbide in said alloy is thoroughly solubilized, to T + 100°C for 1 minute or more; cooling it once to a level of 200°C or less; and carrying out a thermal treatment under conditions within a hatched range(Z)in Figure 15, said alloy comprising: in terms of % by weight, 0.15% or less of C; 1.0% or less of Si; 1.0% or less of Mn; 25 to 35% of Cr; 40 to 70% of Ni; 0.5% or less of Al; 0.01 to 1.0% of Ti; 0.5 to 5.0%, in all, of one or more of Mo, W and V; 0.030% or less of P; 0.020% or less of S; and the residue of Fe and impurities.
References Cited (Backward Citations)
JPS5425216A
Cited
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