Low Mn alloy steel for cryogenic service and method of preparati

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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148 12F, 148 36, 148134, 148143, 148144, C22C 3804, C21D 600

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042578086

ABSTRACT:
A ferritic cryogenic steel which has a relatively low (about 4-6%) manganese content and which has been made suitable for use at cryogenic temperatures by a thermal cycling treatment followed by a final tempering. The steel includes 4-6% manganese, 0.02-0.06% carbon, 0.1-0.4% molybdenum and 0-3% nickel.

REFERENCES:
patent: Re28645 (1975-12-01), Aoki et al.
patent: 3388988 (1968-06-01), Nagashima et al.
patent: 4047979 (1977-09-01), Grange et al.
patent: 4162158 (1979-07-01), Hwang et al.
J. W. Morris, Jr. et al., "The Use of Martensite Reversion in the Design of Tough Cryogenic Steels", _Proc. First Jim Internat. Symposium, May 10-12, 1976.
S. Jin et al., Metallurgical Trans. A, vol. 6A, pp. 141-149 (1975).

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