Patent ID: 6761780
Filing Date: 2004-07-13
Classification: C21D,C22C

Abstract:
A method of manufacturing a cold rolled high Mn non-magnetic steel sheet for cryogenic temperature use, which comprises:heating a steel material consisting essentially of, on a weight percent basis: from 0.05 to 0.18% of C from 26.0 to 30.0% of Mn, from 5.0 to 10.0% of Cr, from 0.05 to 0.15% of N, from 0.01 to 0.07% of Al, from 0.01 to 0.1% of V, from 0.1 to 1.0% of Si, from 0.003 to 0.02% of Ca and balance being Fe and inevitable impurities and hot rolling the material into a hot rolled steel sheet, annealing the hot rolled sheet and then cold rolling to form a cold rolled sheet and then annealing the cold rolled sheet, in which a hot rolling start temperature is from 1050 to 1200Â° C. and a rolling end temperature is 700 to 1000Â° C. for the hot rolling and, further, the annealing temperature for the cold rolled sheet annealing is from 1050 to 1200Â° C.