Composite structure sheet steel with excellent elongation...

Details Composite structure sheet steel with excellent elongation... Composite structure sheet steel with excellent elongation...

2005-12-01

2008-08-19

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S331000, C148S332000, C148S336000, C148S603000, C148S652000

Reexamination Certificate

active

07413617

ABSTRACT:
The present invention provide a TRIP-type composite structure steel plate of the TPF steel type in which elongation and stretch flange formability at room temperature are improved by controlling the morphology of the second-phase structure. In a composite structure sheet steel comprising 0.02 to 0.12% C, 0.5 to 2.0% Si+Al and 1.0 to 2.0% Mn, with the remainder being Fe and unavoidable impurities, and comprising 80% or more polygonal ferrite (steel structure space factor) and 1 to 7% retained austenite, with the remainder being bainite and/or martensite, wherein the elongation and stretch flange formability of the composite sheet steel are improved by reducing the number of bulky, massive second phases with an aspect ratio of 1:3 or less and a mean grain size of 0.5 μm or more in the second phase of this composite structure, which comprises retained austenite and martensite.

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