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Welded Joint Having Excellent Fatigue Strength
Abstract: The propagation speed of fatigue cracks in a HAZ is restricted, and the fatique strength of an as-welded joint can be improved, by limiting an area ratio of a ferrite micro-structure in the HAZ of the welded joint to 20 to 100% and the balance to one of a bainite, a martensite, a pearlite and a residual austenite micro-structure, or limiting a carbon equivalent of a steel plate used for the welded joint to not greater than 0.275.
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Notices, Deadlines & Correspondence
Notices, Deadlines & Correspondence
Patent Information
Application #
Filing Date
18 February 2005
Publication Number
52/2006
Publication Type
INA
Invention Field
METALLURGY
Status
Email
Parent Application
Applicants
NIPPON STEEL CORPORATION,
6-3, OTEMACHI 2-CHOME, CHIYODA-KU, TOKYO, JAPAN.
Inventors
1. KATSUMI KUREBAYASHI,
20-1, SHINTOMI, FUTTSU CITY, CHIBA, JAPAN.
2. SYUJI AIHARA,
5-3, TOKAIMACHI, TOKAI CITY, AICHI, JAPAN.
3. HIDESATO MABUCHI,
1, OAZA-NISHINOSU, OITA CITY, OITA, JAPAN.
4. HIDESATO MABUCHI,
1, OAZA-BISHINOSU, OITA CITY, OITA, JAPAN.
5. NAOKI SAITO,
20-1, SHINTOMI, FUTTSU CITY, CHIBA, JAPAN.