Sumitomo Electric Industries, Limited

Sumitomo (sei) Steel Wire Corp.

Katsutoshi Iwamoto

Hiromu Izumida

Shinei Takamura

Kazuaki Sugimura

Akihisa Hosoe

Takumi Akada

Tetsuya Nakajima

Kenichi Shimizu

Fuminori Okada

A steel wire is formed of a steel containing: not less than 0.6 mass % and not more than 0.7 mass % carbon, not less than 1.2 mass % and not more than 2.1 mass % silicon, not less than 0.2 mass % and not more than 0.6 mass % manganese, not less than 1.4 mass % and not more than 2 mass % chromium, and not less than 0.15 mass % and not more than 0.3 mass % vanadium, with the balance being iron and unavoidable impurities. The steel includes a matrix made up of tempered martensite, and a non-metallic inclusion present in the matrix. When √area of the non-metallic inclusion is represented as Hand √area of a region including both the non-metallic inclusion and a decreased-hardness portion is represented as H, a ratio of Hto H, or, H/His at least 1 and less than 1.3.

Steel wire and spring

A strand for a wiring harness includes a first element wire and a second element wire twisted around the first element wire and made of copper or a copper alloy. The first element wire includes a core portion made of stainless steel and a covering layer covering the core portion and made of copper or a copper alloy.

Strand for wiring harness and wiring harness

An object of the present invention is to improve machining speed by realizing both conductive properties and discharge performance with regard to an electrode wire for wire electric discharge machining, the electrode wire being obtained by plating a steel wire with a copper-zinc alloy. Another object is to suppress the occurrence of separation, cracking, and the like of plating in a wire-drawing step of an electrode wire. An electrode wire for wire electric discharge machining of the present invention includes a steel wire () serving as a core wire, and a plating layer () that covers the steel wire and that is composed of a copper-zinc alloy, in which an average zinc concentration of the plating layer is 60% to 75% by mass, a conductivity of the plating layer is 10% to 20% IACS, and a wire diameter is 30 to 200 &#x3bc;m.

Electrode wire for wire electric discharge machining, and method for producing same

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Itami, Japan

Katsutoshi Iwamoto