Nippon Mining & Metals Co., Ltd.

Nippon Mining Co., Ltd.

Nihon Kogyo Kabushiki Kaisha

Kiyoaki Nishikawa

Yoshihiro Ozeki

Toshiyuki Ono

Masahiro Tsuji

Susumu Kawauchi

Masazumi Mori

Ryoichi Nobuyoshi

Junji Honda

A punched part consists of an Fe--Cr--Ni alloy essentially consisting of from 15 to 20% of Cr, from 9 to 15% of Ni, from 0.001 to 0.0050% of S, the balance being Fe and unavoidable impurities. The burrs formed during punching are suppressed due to addition of S to the Fe--Cr--Ni alloy.

Punched electron gun part of a Fe-Cr-Ni alloy

An Fe-Cr-Ni alloy used for parts of an automatic loom such as a heald (7) and reed (12) consisting of from 13 to 20% of Cr, from 4 to 15% of Ni, the balance being Fe and unavoidable impurities, and having a microstructure that is 60% or more strain-induced martensite. Wear resistance of the parts is improved, so that neither fluff nor rupture of yarn occurs during loom operation.

Fe-Cr-Ni alloy for wear-resistant loom parts

A nonmagnetic stainless steel for high burring has the absolute value of the plane anisotropy .DELTA.r of the Lankford value r of 0.12 or under, the .DELTA.r being .DELTA.r=(r.sub.0 +r.sub.90 -2r.sub.45)/2 wherein r.sub.0. r.sub.45, and r.sub.90 are the r-values at angles of 0.degree., 45.degree., and 90.degree., respectively, to the direction of rolling to which the steel is subjected. The nonmagnetic stainless steel is useful for electron tube parts, especially for the electrodes of electron guns for color picture tubes and is made by the steps of adjusting the grain size of a nonmagnetic stainless steel before final rolling to the range from 4.0 to 7.0 in the austenite grain size conforming to JIS G0551, finishing the work to a desired thickness by final cold rolling to a cold reduction of 20 to 50%, and finally annealing the same to an austenite grain size according to JIS G0551 ranging from 7.0 to 12.0.

Nonmagnetic stainless steel for high burring and method of manufacturing

A process for selectively annealing metal strips, which comprises forming a deposit in the form of a continuous or intermittent stripe or stripes of graphite powder at least 50% of which is 20 .mu.m or less in particle diameter, on one side or both sides of a metal strip, and then heating the deposit by laser or a high-luminance light source to form a selectively annealed portion or portions. The graphite powder is one graphitized at a temperature of 3000.degree. C. or above. The deposit is 500 .mu.m or less in thickness. The graphite powder has a true density of 2.1 g/cm.sup.3 or above. It has an average interplanar spacing between planes of the carbon hexagon of 3.60 .ANG. or below. Its microcrystal grain diameter is 500 .ANG. or more. In another aspect of the invention, a process for selectively annealing metal strips is provided which is characterized by the steps of forming a continuous or intermittent stripe or stripes of a deposit of graphite powder on one side or both sides of a metal strip having a mirror reflectivity of at least 20% on the surface, and then heating the deposit by a high-luminance light source to form a selectively annealed portion or portions. Here again, it is desirable to use a graphite powder having characteristics as described above.

Process for selectively annealing metal strips

There is disclosed an excellently corrosion-resistant copper alloy suited for use in fabricating fins for heat exchangers, particularly for automobile radiators, which is substantially consisted of 0.005 to 0.1 wt % Pb and 0.01 to 1.0 wt % Co and the remainder Cu with or without the addition of 0.01 to 1.0 wt % one or more of Al, Sn, Mg, Ni, Te, In, Cd, As, Mn, Cr, Ti, Si, Zn, Be, Fe and P.

Corrosion-resistant copper alloy

Corrosion-resistant copper alloys for the manufacture of radiators are composed of, by weight, 25-40% zinc, 0.005-0.070% phosphorus, 0.05-1.0% each tin and aluminum, and the balance copper and inevitable impurities.

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Kanagawa, Japan

Kiyoaki Nishikawa