Sumitomo Metal Industries, Inc.

Mitsubishi Jukogyo Kabushiki Kaisha

Sumitomo Industries, Ltd.

Hiroo Nagano

Kazuo Yamanaka

Haruhiko Kajimura

Toshio Yonezawa

Hiroshi Susukida

Takao Minami

Nobuya Sasaguri

Kichiro Onimura

Takashi Fukuda

Yasutaka Okada

Katsuji Kawaguchi

Minoru Miura

Mamoru Inoue

Hiroshi Nagai

Terumi Oda

Takaya Kusakabe

Tsuyoshi Kodama

Yasuyuki Nakamura

Yaautaka Okada

A zirconium alloy which has good creep strength and bending properties as well as improved corrosion resistance in nitric acid solutions of low, medium, and high concentrations and which can withstand stress corrosion cracking in highly concentrated nitric acid solutions even under a high anodic potential is disclosed. The zirconium alloy consists essentially of, by weight percent:

Zirconium-titanium and/or tantalum oxygen alloy

A nickel-chromium alloy excellent in a stress corrosion cracking resistance which is obtained by carrying out an annealing treatment under specific conditions, said alloy having the following composition:

Nickel-chromium alloy in stress corrosion cracking resistance

An alloy for heat transfer pipes excellent in an alkali stress corrosion cracking resistance which is obtained by heating and retaining said alloy at a temperature within the range of a temperature (T.degree.C.), at which a carbide in said alloy is thoroughly solubilized, to T+100.degree. C. for 1 minute or more; cooling it once to a level of 200.degree. C. or less; and carrying out a thermal treatment under conditions within a hatched range Z in FIG. 2, said alloy comprising: in terms of % by weight, 0.15% or less of C; 1.0% or less of Si; 1.0% or less of Mn; 25 to 35% of Cr; 40 to 70% of Ni; 0.5% or less of Al; 0.01 to 1.0% of Ti; 0.5 to 5.0%, in all, of one or more of Mo, W and V; 0.30% or less of P; 0.020% or less of S; and the residue of Fe and impurities.

Method for thermal treatment of alloy for heat transfer pipes

A method for a thermal treatment of a nickel based alloy, characterized in that said nickel based alloy for a material which will be subjected to a high-temperature and high-pressure water or vapor comprises, in terms of % by weight, 58% or more of Ni, 25 to 35% of Cr, 0.003% or less of B, 0.012 to 0.035% of C, 1% or less of Mn, 0.5% or less of Si, 0.015% or less of P, 0.015% or less of S, and the residue of Fe and usual impurities; in a first thermal treatment process, said nickel based alloy is heated and retained at a temperature of T.degree. C. to (T+100).degree.C. and is cooled at a cooling rate of a furnace cooling rate or more; and in a second thermal treatment process, said nickel based alloy is then retained at a temperature of 600.degree. to 750.degree. C. and at a temperature within a sensitization recovery range for a period of 0.1 to 100 hours and is cooled at a cooling rate of said furnace cooling rate or more.

Method for thermal treatment of nickel based alloy materials

An austenitic stainless steel exhibiting improved resistance to corrosion caused by nitric acid is disclosed, which consists essentially of:

Austenitic stainless steel with improved resistance to corrosion by

A dual-phase stainless steel exhibiting improved resistance to corrosion caused by nitric acid is disclosed, which consists essentially of:

Dual-phase stainless steel with improved resistance to corrosion by

Electrolytic descaling of a steel wire is carried out at a high current density by a non-contact flow method in the presence of ferrous ions in the electrolyte to prevent the consumption of electrodes.

Method for continuous electrolytic descaling of steel wire by

Mill scales formed on the surface of a steel wire are continuously removed by causing the wire to pass through a plurality of pairs of electrodes which are connected to an electric power source and arranged in series in an electrolytic cell without contacting the electrodes. This apparatus is applicable in a continuous stretching equipment.

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Kobe, Japan

Hiroo Nagano