ROLLED STEEL PRODUCT EXCELLENT IN WEATHERABILITY AND FATIGUE RESISTING CHARACTERISTIC AND METHOD OF PRODUCTION THEREOF

Title:

ROLLED STEEL PRODUCT EXCELLENT IN WEATHERABILITY AND FATIGUE RESISTING CHARACTERISTIC AND METHOD OF PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2000/008221

Kind Code:

A1

Abstract:

A simple method of producing at a low cost a rolled steel product which is used for a steel structure member such as a bridge and a steel tower to be installed on a seashore where there is a possibility of a corroded steel product and a fatigued joint due to scattered sea salt particles and in an area where snow melting salt is used, which is excellent in weatherability and fatigue resisting characteristic, which is a building construction steel product containing 0.02 to 0.20 wt.% of C and trace amounts of Ni, Cu and Mo as added essential elements, and which has a Ni/Cu concentration ratio of not less than 0.8, not larger than 2 $g(m)m of inner oxidation layer in the steel product surface and concentrated layers of Ni, Cu and Mo not smaller than 2 $g(m)m deep on the inner oxidation layer.

Inventors:

YAMAMOTO KOUICHI (JP)
SATOH HIRONORI (JP)

Application Number:

PCT/JP1999/004239

Publication Date:

February 17, 2000

Filing Date:

August 05, 1999

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
YAMAMOTO KOUICHI (JP)
SATOH HIRONORI (JP)

International Classes:

C22C38/00; C22C38/42; C22C38/44; (IPC1-7): C22C38/00; C21D8/00; C22C38/16; C22C38/58

Foreign References:

JPH04333516A	1992-11-20
JPH0610043A	1994-01-18
JPH0995754A	1997-04-08
JPH05311324A	1993-11-22
JPH0196027A	1989-04-14
JPH09104950A	1997-04-22

Other References: