HIGH-CHROMIUM AND HIGH-NICKEL ALLOY WITH HYDROGEN SULFIDE CORROSION RESISTANCE

WIPO Patent Application WO/1997/048830

A1

A high-chromium and high-nickel alloy having the following chemical composition and being excellent in hydrogen sulfide corrosion resistance under the conditions of a partial pressure of hydrogen sulfide gas of about 1 atm or less and a temperature of about 150 �C. As the alloy does not contain any expensive elements such as Mo and W, it is inexpensive and can be mass-produced. Si: 0.05-1.0 % (by weight, the same applies hereinbelow); Mn: 0.1-1.5 %; Cr: 20-30 %; Ni: 20-40 %; sol. Al: 0.01-0.3 %; Cu: 0.5-5.0 %; REM: 0-0.10 % Y: 0-0.20 %; Mg: 0-0.10 %; Ca: 0-0.10 %; balance: Fe and inevitable impurities. The content of each of C, P and S in the inevitable impurities is respectively at most 0.05 %, at most 0.03 % and at most 0.01 %. As shown in the above composition, REM, Y, Mg and Ca need not be added, while, if necessary, at least one of them is added preferably in the range of 0.001-0.10 % REM, 0.001-0.20 % Y, 0.001-0.10 % Mg, and 0.001-0.10 % Ca.

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UEDA MASAKATSU (JP)

PCT/JP1996/001672

December 24, 1997

June 17, 1996

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SUMITOMO METAL IND (JP)
UEDA MASAKATSU (JP)

C22C38/42; (IPC1-7): C22C38/00; C22C30/02; C22C38/42

JPH03104842A	1991-05-01
JPH05148592A	1993-06-15
JPH08109444A	1996-04-30

BY THE 19TH COMMITTEE OF JAPAN SOCIETY FOR THE PROMOTION OF SCIENCE, SEIBUNDO SHINKOSHA, "Steel and Alloy Element", Vol. 1, 28 February 1966, p. 386-390.
See also references of EP 0851037A4

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