Tokyo Shibaura Denki Kabushiki Kaisha

Jfe Steel Corporation

Mitsui Petrochemical Industries, Ltd.

Hiromi Yoshida

Takeshi Yokota

Yasushi Tanaka

Kaneharu Okuda

Yoshihiro Hosoya

Toshiaki Urabe

Hayato Saito

Toshihiko Oguchi

Riichiro Nagano

Masami Kobayashi

Masataka Miyamura

Akio Ishizawa

Katsumi Funakoshi

Sakae Tamura

Takehiko Kotoh

A high strength galvanized steel sheet with excellent appearance that does not have non-uniformity of coating or coating defects or allow linear defects to occur after press forming includes a steel sheet having a ferrite single-phase structure and having a composition containing 0.0005% to 0.0040% by mass of C; 0.1% to 1.0% by mass of Si; 1.0% to 2.5% by mass of Mn; 0.01% to 0.20% by mass of P; 0.015% by mass of less of S; 0.01% to 0.10% by mass of Al; 0.0005% to 0.0070% by mass of N; 0.010% to 0.080% by mass of Ti; 0.0005% to 0.0020% by mass of B; 0.05% to 0.50% by mass of Cu; 0.03% to 0.50% by mass of Ni; and the balance of Fe and incidental impurities.

High strength galvannealed steel sheet with excellent appearance and method for manufacturing the same

A high-strength steel sheet is useful for applications to automobile steel sheets and the like and has excellent deep drawability, a tensile strength (TS) of as high as 440 MPa or more, and a high r value (average r value &#x2267;1.2), and a process for producing the steel sheet. The steel sheet has a composition containing, by % by mass, 0.010 to 0.050% of C, 1.0% or less of Si, 1.0 to 3.0% of Mn, 0.005 to 0.1% of P, 0.01% or less of S, 0.005 to 0.5% of Al, 0.01% or less of N, and 0.01 to 0.3% of Nb, the Nb and C contents in steel satisfying the relation, (Nb/93)/(C/12)=0.2 to 0.7, and the balance substantially including Fe and inevitable impurities. The steel microstructure contains a ferrite phase and a martensite phase at area ratios of 50% or more and 1% or more, respectively, and the average r value is 1.2 or more.

High-strength steel sheet excellent in deep drawing characteristics and method for production thereof

A positive image-forming material consisting of a methylpentene homopolymer or a methylpentene copolymer containing 50 mole percent or more of methylpentene units which has an intrinsic viscosity of not less than 0.2 dl/g as measured in decalin at 135.degree. C. and being soluble in not more than 100 times by weight of cyclohexene at 25.degree. C.

Positive image-forming method using 4-methyl-1-pentene polymer

A method of manufacturing an electret device which comprises the step of causing a pressure deformation jig whose surface is provided with numerous minute convex and concave regions to abut against the surface of a raw dielectric material for an electret and later be removed therefrom, thereby forming minute stretched and contracted region on the surface of said dielectric material.

Method of manufacturing an electret device

A coated powder comprising a transition metal or compound thereof prepared by the process which comprises coating the surface of a powdered transition metal or compound there with a free radical polymerizable monomer having an e value of (-)0.8 to (+)0.8 and then subjecting the resulting coated powder to free-radical polymerization conditions.

Polymer coated transition metal powder as electrostatic image toner

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Tokyo, Japan

Hiromi Yoshida