Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1978-04-05
1980-05-27
Steiner, Arthur J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75122, 75128E, 148 315, 148 38, C22C 3806
Patent
active
042048621
ABSTRACT:
An austenitic heat-resistant steel which forms an oxide film mainly composed of Al.sub.2 O.sub.3 in a high-temperature oxidizing atmosphere, consisting essentially of not more than 0.2% of C, not more than 1.0% of Si, not more than 2.0% of Mn, 12 to 37% of Ni, 9 to 25% of Cr, more than 4.5 but not more than 6% of Al, and at least one member selected from the group consisting of Ti, Nb and Zr in a total amount of not more than 0.8%, with the balance being Fe; the .delta.-ferrite value of this steel, calculated from the formula set forth below, is from 0 to 7.9; this steel is removed of an internal oxide layer which has been formed just below the steel surface during hot working. ##EQU1## where Wi and Mi represent, respectively, the percent by weight and the atomic weight of Ti, Nb and Zr, and when the term ##EQU2## is negative this term is regarded as zero. This steel composition may contain one or more rare earth elements such as Y, Ce and La in a total amount of not more than 0.08%.
REFERENCES:
patent: 3131055 (1964-04-01), Behar
patent: 3362813 (1968-01-01), Zolkowski
patent: 3420660 (1969-01-01), Kawahata et al.
patent: 3619180 (1971-11-01), Staehle
patent: 3754898 (1973-08-01), McGurty
patent: 4086085 (1978-04-01), McGurty
Kado Satoshi
Sakamoto Tetsu
Yamanaka Mikio
Yamazaki Taketomo
Yoshida Kotaro
Nippon Steel Corporation
Steiner Arthur J.
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