| (19) |
 |
|
(11) |
EP 0 246 092 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
03.05.1989 Bulletin 1989/18 |
| (43) |
Date of publication A2: |
|
19.11.1987 Bulletin 1987/47 |
| (22) |
Date of filing: 14.05.1987 |
|
|
| (84) |
Designated Contracting States: |
|
DE GB |
| (30) |
Priority: |
15.05.1986 US 863508
|
| (71) |
Applicant: EXXON RESEARCH AND ENGINEERING COMPANY |
|
Florham Park,
New Jersey 07932-0390 (US) |
|
| (72) |
Inventors: |
|
- Ayer, Raghaven
Stamford
Connecticut 06902 (US)
- Hayworth, Henry Charles
Summit
New Jersey 07901 (US)
- Humphries, Michael Joseph
Ironia
New Jersey 07845 (US)
|
| (74) |
Representative: Somers, Harold Arnold et al |
|
ESSO Engineering (Europe) Ltd.
Patents & Licences
Mailpoint 72
Esso House
Ermyn Way
Leatherhead,
Surrey KT22 8XE
Leatherhead,
Surrey KT22 8XE (GB) |
|
| |
|
| (54) |
Alloys resistant to stress corrosion cracking |
(57) Disclosed are iron, nickel, and cobalt based austenitic alloys containing 12 - 50
wt.% Cr, from 0.001-0.2 wt.% C, 0 - 3 wt.% Mo, 0 - 3 wt.% Mn, 0 - 0.5 wt.% Si, 0 -
0.2 wt.% A1,0 - 0.75 wt.% Zr, and at least one carbide-forming element whose carbide
is more stable than chromium carbide, and which alloy, at equilibrium, generates a
carbon concentration in solution which is insufficient to form chromium carbides at
a temperature from about 425°C - 750°C. The preferred carbide-forming element is Hf
and/or Ta.