Babcock-Hitachi Kabushiki Kaisha

Hitachi, Ltd.

Hisashi Morimoto

Seishin Kirihara

Katsumi Iijima

Kenichi Usami

Masayuki Sukekawa

Kenji Arisaki

Yoshimitsu Tobita

A pyrolysis furnace for cracking hydrocarbons comprising a furnace; a pair of inlet tubes extending generally vertically within the furnace and connected to an outlet tube having a larger diameter than either of the inlet tubes and extending generally vertically within the furnace to an outlet; and burners for imparting radiant heat adjacent to the inlet tubes and adjacent to the outlet tube. The inlet tubes and the outlet tube define a single pass configuration through the furnace.

Pyrolysis furnace for olefin production

A heat-resistant and corrosion-resistant weld metal alloy consisting essentially of, by weight, less than 0.08% of C, 0.1 to 1.0% of Si, 2 to 3% of Mn, 32 to 42% of Ni, 21 to 25% of Cr, 0.8 to 1.7% of Mo, 0.1 to 1.0% of Nb, up to 0.5% of Ti, up to 2% of Co, up to 2% of Cu, up to 1% of W, up to 0.2% of N, up to 1.0% of V, up to 1.0% of Zr, up to 1.0% of Ta and the balance Fe, wherein the following conditions are met: Ti+Zr.ltoreq.1.0%, Ni+Co.ltoreq.42%, W+V.ltoreq.1.0%, Nb+Ta.ltoreq.1.0%, and 4.ltoreq.Nb/C.ltoreq.15; and an austenitic welded structure composed of an austenitic structural alloy and of a weld metal of the above-mentioned kind are provided by the invention.

Heat-resistant and corrosion-resistant weld metal alloy and welded

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Hiroshima, Japan

Hisashi Morimoto