Cold-rolled high strength steel plate with composite steel struc

Details Cold-rolled high strength steel plate with composite steel struc Cold-rolled high strength steel plate with composite steel struc

1982-01-26

1984-01-17

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 12F, 148 124, 148 36, C21D 804

Patent

active

044262353

ABSTRACT:
A cold-rolled high strength steel plate with excellent formability and baking hardenability, has the composition (% by weight) 0.2-0.15% of C, 0.02-0.7% of Mn, 0.01-0.1% of Al and 0.002-0.01% of N, optionally at least one element selected from the group consisting of 0.01-0.8% of Si, 0.01-0.1% of P, 0.0002-0.005% of B and 0.01-0.5% of V, and a microstructure comprising ferrite containing 2-30% of bainite and less than 8% of martensite.
The steel plate is produced by hot and cold rolling steel of the defined composition followed by rapidly heating to a temperature between the Ac.sub.1 and Ac.sub.3 transformation points, holding at this temperature for less than 5 minutes, and quenching to a temperature below 500.degree. C. at a cooling rate between 50.degree. and 500.degree. C./sec.

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Rigsbee et al., "Structure-Processing and Structure-Property Relationships in Commercially Processed Dual-Phase Steels", Conf. Proceedings New Orleans, La., Feb. 19-21, 1979, pp. 304-329.

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