Nippon Steel Corporation

Mansei Tanaka

Koichi Sato

Minoru Nakamura

Motoo Shiraishi

Yoshio Shindou

Saburo Hinenoya

Saburo Ayusawa

Yoshihiro Inuizawa

Fuyuhiko Ohtsuki

Kazuyuki Suzuki

Masami Ishida

Precoated corrosion-resistant steel pipe piles, and structures thereof, for driving into the sea bed wherein the waterproofness, corrosion resistance, and scratch resistance of the steel pipe piles are considerably improved by applying a polyethylene resin over the length thereof.

Precoated corrosion-resistant steel pipe piles for marine use, and

A marine structure comprising steel pipe piles in which the top head, splash zone and tidal zone of each steel pipe pile driven into the sea bed are covered with a polyethylene resinous covering material, and the top head of the steel pipe pile is inserted inside a slab concrete structure, whereby is realized a considerably improvement in the water imperviousness, corrosion resistance, and scratch resistance of the steel pipe piles.

Marine structure of precoated corrosion resistant steel pipe piles

A polypropylene coated steel pipe comprising a steel pipe, an adhesive layer coated on the external surface of the steel pipe, which has been subjected to a pretreatment, and a polypropylene layer coated on the adhesive layer. The outermost polypropylene layer comprises, as a main constituent, a crystalline ethylene-propylene block copolymer and the adhesive layer comprises a modified polyolefin adhesive.

Polypropylene coated steel pipe

A steel pipe is coated with resin at high temperature. After the temperature is lowered slightly below the softening point of the resin, the coated pipe is cut to length and then allowed to be cooled down to an ordinary temperature, meanwhile the resin is freely shrunk, leaving little residual strain in the cooled product coating. A cooling means for cooling the coating from the middle toward the ends in its longitudinal direction and a means for cooling the coating forcibly are provided.

Apparatus for manufacturing a metallic tube coated with a thermoplastic

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Chiba, Japan

Mansei Tanaka