Claims
- 1. 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 1200° C. and a rolling end temperature is 700 to 1000° C. for the hot rolling and, further, the annealing temperature for the cold rolled sheet annealing is from 1050 to 1200° C.
- 2. The method of manufacturing a cold rolled high Mn non-magnetic steel sheet for cryogenic temperature use as defined in claim 1, in which the steel material consists 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 0.50 to 5.0% of Ni, 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.
- 3. The method of manufacturing a cold rolled high Mn non-magnetic steel sheet for cryogenic temperature use as defined in claim 1, further comprising temper rolling after the cold rolled sheet annealing.
- 4. The method of manufacturing a cold rolled high Mn non-magnetic steel sheet for cryogenic temperature use as defined in claim 2, further comprising temper rolling after the cold rolled sheet annealing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-017912 |
Jan 1999 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part application of application Ser. No. 09/492,347 filed on Jan. 27, 2000 now abandoned.
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A |
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Non-Patent Literature Citations (2)
Entry |
Temper Rolling, The Making, Shaping and Treating of Steel, ed. By H. E. McGannon, 1964, 8th Edition, p. 928. |
“Annealing”, Academic Press Dictionary of Science and Technology, http://harcourt.com/dictionary/def/5/9/2/4/592400. html, accessed in Feb. 7, 2001. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/492347 |
Jan 2000 |
US |
Child |
10/013532 |
|
US |