Title:
ROLLED STEEL PRODUCT EXCELLENT IN WEATHERABILITY AND FATIGUE RESISTING CHARACTERISTIC AND METHOD OF PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO2000008221
Kind Code:
A9
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 mu m of inner oxidation layer in the steel product surface and concentrated layers of Ni, Cu and Mo not smaller than 2 mu m deep on the inner oxidation layer.
Inventors:
YAMAMOTO KOUICHI (JP)
SATOH HIRONORI (JP)
SATOH HIRONORI (JP)
Application Number:
PCT/JP1999/004239
Publication Date:
May 25, 2000
Filing Date:
August 05, 1999
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
YAMAMOTO KOUICHI (JP)
SATOH HIRONORI (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
Download PDF: