Mitsubishi Jukogyo Kabushiki Kaisha

Sumitomo Metal Industries, Inc.

Kobe Steel, Ltd.

Takashi Daikoku

Fujimitsu Masuyama

Atsuro Iseda

Hisao Haneda

Hiroshi Teranishi

Shoji Ueda

Teishiro Oda

Yoshimasa Ito

Nobuyuki Nagai

Kunihiko Yoshikawa

Yorimasa Takeda

Yasuo Moriguchi

Teruo Yukitoshi

Akira Hiromoto

Masato Zama

Masahiro Saito

Shintaro Matsuo

Hidejiro Kinoshita

Kunihiko Yoshikama

Kazuhiko Nishida

A high-strength high-Cr ferritic, heat-resistant steel exhibiting improved high-temperature, long-term creep strength and a process for producing the same are disclosed. The steel consists essentially of, by weight %:

High-strength high-Cr ferritic heat-resistant steel

Process for producing a high strength high-Cr ferritic heat-resistant

An alloy containing Mn in an amount of from 5 to 30 weight percent, at least one member selected from the group consisting of Sn of an amount of not more than 5 weight percent, Al of an amount of not more than 8.5 weight percent, Zn of an amount of not more than 7 weight percent, Fe of an amount of not more than 2.5 weight percent, and Ni of an amount of not more than 2.5 weight percent, and the balance to make up 100 weight percent of Cu plus normally entrained impurities produces a metallic material proof against the attachment thereto of marine organisms when the alloy fulfils a requirement that it should possess an .alpha.(face-centered cubic lattice) single-phase structure.

Metallic material proof against attachment of marine organisms

High chromium steel, for use at high temperature, of a mixed structure containing ferrite and 0.02-0.09% C, less than 1.0% Si, 0.1-2.0% Mn, 7.0-13.0% chromium, 1.2-3.0% Mo, and the rest being iron and the usual impurities, or further adding aluminum in an amount less than 0.1% to said composition, or further adding 0.001-0.1% boron and less than 0.1% Ti necessary to cause the boron to act effectively, said steel being heated at temperatures lower than about 1050.degree. C. to prevent the oxidation of the steel.

High chromium steel of mixed structure containing ferrite for high

In a process for heat treating titanium alloys, and .alpha.+.beta. titanium alloy, heated and held in a temperature range above 500.degree. C. and below the .alpha.+.beta./.beta. transformation point, and then quenched, is further aged at a low temperature in the range between 50.degree. and 300.degree. C.

Heat treatment of titanium alloys

A method of sintering ferrous materials comprises mixing an iron powder with an alloy of iron-titanium and forming a liquid phase during the sintering. The alloy is prepared by mixing selected amounts of iron and titanium powders to form an iron-titanium alloy powder consisting essentially of 14 to 46% by weight of titanium and the balance iron, and preferably 14 to 30% by weight of titanium. The sintering step is carried out at a temperature at which the powdered mixture is always in the liquid phase during sintering. Under these conditions oxidation of titanium is suppressed during melting and the alloy is not too soft nor too difficult to pulverize and used for manufacturing the machine components such as piston rings which have surprisingly good properties due to the use of the critical amounts of iron and titanium in the alloys useful according to the invention.

Method of liquid-phase sintering ferrous material with iron-titanium

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Nagasaki, Japan

Takashi Daikoku