A STUDY ON A CRYOGENIC AND NON-MAGNETIC AUSTENITIC STEEL 30Mn23A14Cr5
by ZHANG Yansheng (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 29 December; 1982)
Cite this article:
by ZHANG Yansheng (Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 29 December; 1982). A STUDY ON A CRYOGENIC AND NON-MAGNETIC AUSTENITIC STEEL 30Mn23A14Cr5. Acta Metall Sin, 1983, 19(4): 10-142.
Abstract An attempt was made to develop an austcnitic cryogenic and non-magnetic steel 30Mn23Al4Cr5 with desirable combination of superior properties. Results of experiments indicated that the steel 30Mn23A14Cr5 is possessed of satisfactory strength and excellent toughness from room temperature to -269℃, i. c. V-notched impact toughness equal to 2048 kJ/m~2 at -269℃. Its low temperature austenite is quite stable, no α'-or ε-martensite was observed under tensile test at -269℃. after 10 or 50％ deformed respectively.Furthermore, other properties were also determined as: low magnetic permeability about 1.005, high resistivity up to 1.08, lower cold constraction and higher resistance to atmospheric corrosion than ferrite 9％Ni steel, and less aging embrittlement than conventional Cr-Ni austcnitic steels. Thus, the proposal can be made that the steel 30Mn23Al4Cr5 is indeed applicable to such uses as a cryogenic steel from -150 to -269℃ and a non-magnetic steel from 600 to -269℃.
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