C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
149/6, 148/34.4
C21D 7/00 (2006.01)
Patent
CA 1078292
ABSTRACT A method of producing cold rolled ferritic stainless steel having a surface hardness and smoothness suitable for stamping into coins, which comprises providing a non-hardenable ferritic stainless steel casting having a maximum of 0.03% carbon by weight, hot rolling the casting to intermediate thickness, box annealing at a temperature of 815° to 845°C for at least 4 hours in a non-oxidizing atmoshere, abrading to remove up to 0.07 mm of the thickness, pickling in an acid solution, cold rolling to final thickness, and continuously annealing at 845° to 900°C in a hydregen atmosphere.
265093
Chalk David L.
Pontius William F.
Smith Gary B.
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