High-yield-ratio and high-strength thin steel sheet superior...

Details High-yield-ratio and high-strength thin steel sheet superior... High-yield-ratio and high-strength thin steel sheet superior...

2004-09-30

2011-12-27

Wyszomierski, George (Department: 1733)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C148S661000, C148S330000, C420S120000, C420S121000, C420S124000

Reexamination Certificate

active

08084143

ABSTRACT:
High yield ratio high-strength thin steel sheet superior in weldability and ductility characterized by: being comprised of steel containing, by mass %, C: over 0.030 to less than 0.10%, Si: 0.30 to 0.80%, Mn: 1.7 to 3.2%, P: 0.001 to 0.02%, S: 0.0001 to 0.006%, Al: 0.060% or less, N: 0.0001 to 0.0070%, containing further Ti: 0.01 to 0.055%, Nb: 0.012 to 0.055%, Mo: 0.07 to 0.55%, B: 0.0005 to 0.0040%, and simultaneously satisfying 1.1 ≦14×Ti(%)+20×Nb(%)+3×Mo(%)+300×B(%)≦3.7, the balance comprised or iron and unavoidable impurities, and having a yield ratio of 0.64 to less than 0.92, a TS×E11/2of 3320 or more, an YR×TS×EL1/2of 2320 or more, and a maximum tensile strength (TS) of 780 MPa or more.

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