High strength cold rolled steel sheet having excellent non-aging

Details High strength cold rolled steel sheet having excellent non-aging High strength cold rolled steel sheet having excellent non-aging

1992-04-24

1994-10-18

Yee, Deborah

Metal treatment

Stock

Ferrous

148661, 148652, 148651, C22C 3812, C21D 804

Patent

active

053564944

ABSTRACT:
The invention relates to a high strength cold rolled steel sheet having excellent non-aging property at room temperature and excellent drawability, said steel sheet having a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density.
The invention also relates a high strength cold rolled steel sheet having excellent non-aging property at room temperature and bake hardenability, as well as excellent drawability. This steel sheet is produced by preparing a hot-rolled steel sheet, cold rolling the hot-rolled steel sheet at a rolling reduction not smaller than 60%, annealing the cold rolled steel sheet at a temperature which is not lower than the .gamma. transformation start temperature but below the A.sub.c3 transformation temperature, and cooling the annealed steel sheet at a rate not smaller than 5.degree. C./sec but not greater than 100.degree. C./sec.

REFERENCES:
patent: 5931827 (1992-03-01), Osawa et al.

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