High tensile cold rolled steel sheet and high tensile hot dip ga

Details High tensile cold rolled steel sheet and high tensile hot dip ga High tensile cold rolled steel sheet and high tensile hot dip ga

1990-11-13

1991-12-24

Dean, R.

Metal treatment

Compositions

Heat treating

148156, 148333, 428659, C21D 946

Patent

active

050749269

ABSTRACT:
A high tensile cold rolled steel sheet improved in stretch flanging property, containing 0.03% to 0.15% by weight of C, 0.05% or less by weight of Si, 0.5% to 1.2% by weight of Mn, 0.005% to 0.045% by weight of Nb, and 0.10% or less by weight of Al, the remainder being iron and unavoidable impurities, and the steel sheet having a uniform and fine recrystallized ferrite structure having a mean grain diameter of 20 .mu.m or less and an area fraction of 95% or more having improving ductility and a process for its preparation.

REFERENCES:
patent: 4473414 (1984-09-01), Irie et al.
patent: 4525598 (1985-06-01), Tsukamoto et al.

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