Daido Tokushuko Kabushiki Kaisha

Inco Alloys International, Inc.

Nippon Kokan Co., Ltd.

Kazuto Terai

Kiyohito Ishida

Susumu Isobe

Hitoshi Hayakawa

Yuko Takeuchi

Motoaki Oyama

Hisao Inoue

Masakuni Fujikura

Tomio Kono

Hiroshi Kobayashi

Minoru Yuzuki

Kenji Tsukuda

Naohiro Abe

In a method of the present invention for manufacturing a welded clad steel tube, an alloy including a corrosion-resisting or heat-resisting alloy is overlaid on a raw steel tube to manufacture a cold steel tube. Then, a cold or warm working is subjected to the clad steel tube. The clad steel tube is subjected to a heat treatment at a temperature exceeding a recrystallization temperature of the alloy.

Method for manufacturing welded clad steel tube

Disclosed is an improved skid rail used in furnaces, particularly, the furnaces for heating steel pieces for hot processing. The skid rail uses, as the material of the skid members thereof, an oxide-dispersion reinforced type super alloy which comprises certain amounts of Cr, Fe, Al and Ti, and optionally a certain amount of Co, the balance being Ni, and contains fine particles of a high melting point metal oxide such a Y.sub.2 O.sub.3, ZrO.sub.2 and Al.sub.2 O.sub.3 dispersed in the austenitic matrix of the alloy.

Skid rail

Ferrite-austenite stainless steel castings having an improved erosion-corrosion resistance consist by weight percentage of not more than 0.1% of C, 0.2-3% of Si, not more than 2% of Mn, 2.2-4% of Cu, 3-9% of Ni, 20-30% of Cr, 2-6% of Mo, 0.08-0.25% of N, 0.12-0.3% of Sn, at least one of 0-2% of Nb, 0-1% of Ti, 0-2% of Ta, 0-1% of Zr and 0-1.5% of V and remainder of Fe, and are obtained by solution heat treatment at 1,000.degree.-1,150.degree. C in such a manner that Cr- and Ni-equivalents lie within an area represented by the area ABCD shown in FIG. 1 of the accompanying drawings.

Ferrite-austenite stainless steel castings having an improved

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Ohmiya, Japan

Kazuto Terai