SUPER HIGH TENSILE COLD-ROLLED STEEL PLATE AND METHOD FOR PRODUCTION THEREOF

Title:

SUPER HIGH TENSILE COLD-ROLLED STEEL PLATE AND METHOD FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2002/022904

Kind Code:

A1

Abstract:

A super high tensile cold rolled steel plate which has essentially a chemical composition, in mass %: C: 0.01 to 0.07 %, Si: 0.3 % or less, P: 0.1 % or less S: 0.01 % or less, Sol.Al: 0.01 to 0.1 %, N: 0.0050 % or less, the sum of at least one element selected from among Mn, Cr and Mo: 1.6 to 2.5 wt % and balance: Fe, and a structure such that the inside part having a depth from the surface of the steel plate of 10 µm or more has substantially a single martensite phase, and exhibits a tensile strength of 880 to 1170 MPa. The steel plate exhibits an enlarge percentage of 75 % or more as measured according to Japan Iron and Steel Federation Standard JFST1001-1996 and a tensile strength of 880 to 1170 Mpa and also is excellent in mechanical joining property, and thus is suitably used as a skeleton member for an automobile sheet.

More Like This:

WO/2004/067783	EGLIN STEEL - A LOW ALLOY HIGH STRENGTH COMPOSITION
WO/2004/046400	COLD-WORKED STEELS WITH PACKET-LATH MARTENSITE/AUSTENITE MICROSTRUCTURE

Inventors:

HASEGAWA KOHEI (JP)
URABE TOSHIAKI (JP)
YOSHITAKE AKIHIDE (JP)
TSURUMARU HIDEYUKI (JP)

Application Number:

PCT/JP2001/007822

Publication Date:

March 21, 2002

Filing Date:

September 10, 2001

Export Citation:

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Assignee:

NIPPON KOKAN KK (JP)
HASEGAWA KOHEI (JP)
URABE TOSHIAKI (JP)
YOSHITAKE AKIHIDE (JP)
TSURUMARU HIDEYUKI (JP)

International Classes:

C21D1/19; C22C38/06; C22C38/38; C21D8/02; C21D9/52; (IPC1-7): C22C38/00; C21D9/46

Foreign References:

JPH10130782A

1998-05-19

Other References: