ROLLED H-SHAPED STEEL HAVING UNIFORM MICROSTRUCTURE AND UNIFORM MECHANICAL PROPERTIES AND METHOD FOR PRODUCING THE SAME

Title:

ROLLED H-SHAPED STEEL HAVING UNIFORM MICROSTRUCTURE AND UNIFORM MECHANICAL PROPERTIES AND METHOD FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2001/075182

Kind Code:

A1

Abstract:

A rolled wide flange beam to be used as a member for building structures which has a uniform microstructure and uniform mechanical properties, characterized in that the microstructure in the cross section thereof satisfies one or more of the following requirements , the following percentages being relative to respective values for a 1/4 flange portion : 1) a 1/2 flange portion and a fillet portion have an average ferrite grain diameter in the microstructure within ± 15 %, 2) a 1/2 web portion has an average ferrite grain diameter in the microstructure within ± 15 %, 3) a 1/2 flange portion and a fillet portion have an average pearlite percentage in the microstructure within ± 8 %, and 4) a 1/2 web portion has an average pearlite percentage in the microstructure within ± 8 %.

Inventors:

YOSHIDA SUGURU (JP)
SATOH HIRONORI (JP)
YAMAMOTO TAKESHI (JP)
SAIKI EIJI (JP)
KUROKAWA MASAO (JP)

Application Number:

PCT/JP2001/002931

Publication Date:

October 11, 2001

Filing Date:

April 04, 2001

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
YOSHIDA SUGURU (JP)
SATOH HIRONORI (JP)
YAMAMOTO TAKESHI (JP)
SAIKI EIJI (JP)
KUROKAWA MASAO (JP)

International Classes:

C21D8/00; C22C38/12; B21B1/08; C21D9/00; (IPC1-7): C21D8/00; B21B1/08; C22C38/00; C22C38/12

Foreign References:

JPH09137218A	1997-05-27
EP0609556A2	1994-08-10
JPS5357116A	1978-05-24
JPS6250548B2	1987-10-26
JPS6254862B2	1987-11-17
JPH1060576A	1998-03-03

Other References: