寒冷海域海洋構造物用高張力鋼の大入熱溶接継手特性とその評価(その3)

概要

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TMCP-manufactured low-temperature steel plate 60mm in thickness and 400MPa class in yield point, newly developed for application to a cone-type fixed offshore structure to operate in the Arctic Ocean (design temperature: -50deg.C), was evaluated for fracture toughness it would offer as base plate and in way of the welded joint produced in it, with the conclusion as capsulized hereunder. (1) Despite its thickness of 60mm, the steel plate is of uniform material properties by virtue of TMCP employed in the manufacturing process. (2) Engineering considerations incorporated to prevent the toughness deterioration at HAZ of high-heat-input welded joint and to improve the toughness of local brittle zone (LBZ) in HAZ of multilayer welded joint enable the steel plate to offer excellent toughness at HAZ of every welded joint produced in it. (3) The newly developed steel plate is fully capable of practical application to the Arctic Offshore structures and, besides, can be fabricated by high-heat-input welding process (max. heat input: 19.3kJ/mm).
社団法人日本船舶海洋工学会の論文
1992-03-29