Sumitomo Metal Industries, Inc.

Kobe Steel, Ltd.

Doryokuro Kakunenryo Kaihatsu Jigyodan

Susumu Hirano

Kunio Kondo

Takashi Takano

Miyuki Yamamoto

Kenichi Beppu

Keisuke Hitoshio

Masayuki Fujiwara

Hiroshi Teranishi

Shigeo Nomura

Toshio Nishida

Itaru Shibahara

Takanari Okuda

Hidetoshi Kurata

Yuji Enokido

Yoshinori Tateishi

Motoharu Nakajima

Aturou Iseda

In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of:

High strength steel pipe for an air bag

In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of:  if necessary at least one of Mo: at most 0.50%, Ni: at most 1.5%, Cu: at most 0.5%, V: at most 0.2%, Ti: at most 0.1%, Nb: at most 0.1%, and B: at most 0.005%, and also if necessary, at least one of Ca: at most 0.01%, Mg: at most 0.01%, and REM (rare earth elements): at most 0.01%, and a remainder of Fe and impurities is used to produce a steel pipe, and the pipe is then subjected to cold working to predetermined dimensions, then to heating to a temperature of at least the Actransformation temperature followed by quenching, and then to tempering at a temperature no higher than the Actransformation temperature.

High strength steel pipe for an air bag and a process for its manufacture

A dispersion strenghened ferritic steel having excellent ductility and toughness which has been heat treated to produce a matrix having a tempered martensitic structure composed of 0.05 to 0.25% by weight of carbon, 0.1% by weight or less of silicon , 0.1% by weight or less of manganese, 8 to 12% by weight of chromium, 0.1 to 4.0% by weight in total of molybdenum and tungsten, and 0.02% by weight or less of oxygen (exclusive of oxide particles) with the balance being iron and inevitable impurities and, homogeneously dispersed in the matrix, composite oxide particles comprising Y.sub.2 O.sub.3 and TiO.sub.2 in an amount of 0.1 to 1.0% by weight in total of Y.sub.2 O.sub.3 and TiO.sub.2 and a TiO.sub.2 to Y.sub.2 O.sub.3 molar ratio of 0.5 to 2.0.

Dispersion strengthened ferritic steel for high temperature structural

A dispersion strengthened ferritic steel cladding tube for use in a nuclear reactor and having a double-layer structure is provided. The cladding tube comprises a tube body made of a dispersion strengthened ferritic steel having a ceramic dispersed therein and containing 8 to 13% by weight of chromium. The inner surface of the tube body is lined with a ferritic steel containing 18 to 30% by weight of chromium. The cladding tube has not only excellent compatibility with a mixed oxide fuel but also excellent high temperature strength and swelling resistance. A method of producing the cladding tube using powder metallurgy is also provided.

Dispersion strengthened ferritic steel cladding tube for nuclear reactor

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Amagasaki, Japan

Susumu Hirano