Method for producing a dual-phase, ferrite-martensite steel...

Details Method for producing a dual-phase, ferrite-martensite steel... Method for producing a dual-phase, ferrite-martensite steel...

C - Chemistry, Metallurgy

21

D

148/34.4

C21D 8/02 (2006.01) C21D 1/18 (2006.01)

Patent

CA 1123718

ABSTRACT OF THE DISCLOSURE A dual-phase steel strip is produced by heating a hot rolled steel strip to a temperature within the inter- critical temperature range, annealing the heated strip for a period of from 15 seconds to 5 minutes, and controlling the average cooling rate to about 3.6F°-45F°/sec. (2C°-25C°/sec.) down to the martensite formation temperature of about 850°F. ? 100°F. (454°C. + 56°C.). The hot rolled strip will have a chemical composition of 0.08 to 0.12% C, 1.25 to 1.8% Mn, 0.5 to 0.7% Si, and 0.1 to 0.7% Cr, the balance being substan- tially Fe. - 10 -

333293

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