C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/99
C22C 38/50 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01) C22C 38/48 (2006.01)
Patent
CA 1097948
ABSTRACT OF THE DISCLOSURE Herein disclosed is a low carbon austenitic steel hav- ing an improved resistance to stress corrosion cracking. The austenitic steel consists essentially of, by weight; less than 0.029% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3.0% of manga- nese; 23 to 45% of nickel; 20 to 35% of chromium; 0.5 to 4.0% of vanadium; titanium in an amount of at least 5 times carbon con- tent and up to 1% of the total composition, and/or niobium in an amount of at least 7 times carbon content and up to 1% of the total composition, and/or zirconium in an amount of at least 7 times carbon content and up to 1% of the total composition, and/ or tantalum in an amount of at least 7 times carbon content and up to 2% of the total composition, and/or tungsten in an amount of at least 5 times carbon content and up to 2% of the total position, the total amount of titanium and/or niobium and/or zir- conium and/or tantalum and/or tungsten being in the range of at least 5 times carbon content and up to 2% of the total composi- tion; if desired, copper and/or molybdenum in a total amount of 0.3 to 4%; and the balance of iron. This steel has outstanding utility as the materials of heat exchangers or pipes for genera- tion of steam in nuclear reactors.
298026
Fujikawa Hisao
Kowaka Masamichi
Sumitomo Metal Industries Ltd.
Swabey Ogilvy Renault
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