Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Tomonori Tominaga

Tadashi Ishikawa

Tetsuro Nose

Kiyotaka Nakashima

Kazumi Matsuoka

Tadashi Kasuya

Koji Homma

Masakazu Sugimoto

Yakichi Higo

Kazuki Takashima

Tetsumi Kondoh

The floating body structure is a floating body structure that supports an object to be supported so that the object to be supported floats in the sea, including a floating body section connected to a base end portion of the object to be supported, wherein the floating body section has a lid body made of steel, an outer pipe made of steel, and an inner pipe made of steel and provided inside the outer pipe, and the floating body section is hermetically sealed by the lid body in a state where at least a portion of a gap formed between an outer wall surface of the inner pipe and an inner wall surface of the outer pipe is filled with concrete or mortar.

Floating body structure

A method of production of a metallic product with a nanocrystallized surface layer comprising subjecting a surface layer of a metallic product to ultrasonic impact treatment by one or more ultrasonic indenters vibrating in a plurality of directions, then subjecting the surface layer subjected to the ultrasonic impact treatment to heat treatment at a low temperature to cause precipitation of nanocrystals.

Method of production of steel product with nanocrystallized surface layer

A novel treatment method, for improving fatigue life, is provided that aims to resolve problems associated with conventional treatment methods for improving fatigue life of metal by reduction of stress concentration and conventional treatment methods for improving fatigue life of metal by introduction of compressive stress, that is, problems of poor efficiency in work execution, required level of skill of workers, and the impossibility of quality control due to lack of means for measuring the effect after treatment, characterized in that, for locations in metal for which fatigue is a problem, after pre-treatment is performed, ultrasonic impact treatment is performed, and thereafter, a quality assurance test is performed so as to improve the fatigue life of the metal.

Treatment method for improving fatigue life and long-life metal material treated by using same treatment

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Futtsu, Japan

Tomonori Tominaga