Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1978-02-21
1980-05-06
Steiner, Arthur J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75125, 75128C, 75128V, 75134F, C22C 3802, C22C 3842, C22C 3846
Patent
active
042015740
ABSTRACT:
Herein disclosed is a low carbon austenitic steel having 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 manganese; 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 content 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 composition, the total amount of titanium and/or niobium and/or zirconium and/or tantalum and/or tungsten being in the range of at least 5 times carbon content and up to 2% of the total composition; 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 generation of steam in nuclear reactors.
REFERENCES:
patent: 2553330 (1951-05-01), Post et al.
patent: 2873187 (1959-02-01), Dyrkacz et al.
patent: 3300347 (1967-01-01), Kasza et al.
patent: 3607239 (1971-09-01), Mimino
patent: 3926620 (1975-12-01), Kowaka et al.
patent: 4035182 (1977-07-01), Kowaka et al.
Fujikawa Hisao
Kowaka Masamichi
Steiner Arthur J.
Sumitomo Metal Industries Ltd.
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