High tensile steel sheet having excellent stretch flanging forma

Details High tensile steel sheet having excellent stretch flanging forma High tensile steel sheet having excellent stretch flanging forma

1993-03-05

1994-07-26

Yee, Deborah

Metal treatment

Stock

Ferrous

148319, 148902, C22C 3814, C22C 3812

Patent

active

053324536

ABSTRACT:
A high tensile steel sheet excelling in workability and stretch flanging formability, which is of a composite texture composed of a ferrite phase and a 2nd phase selected from the group consisting of martensite, bainite, pearlite, retained austenite and cold-transformed ferrite, wherein the volume fraction of the 2nd phase is not less than about 1.3 times higher at an outer region of the steel sheet than the volume fraction of the 2nd phase in a central region of the sheet thickness.

REFERENCES:
patent: 4504326 (1985-03-01), Tokunaga et al.
patent: 5017248 (1991-05-01), Kawano et al.
patent: 5041166 (1991-08-01), Matsuoka et al.

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