Hitachi Metals, Ltd.

Hidenori Abe

Takahiro Sato

Seigi Aoyama

Toru Sumi

Hiromitsu Kuroda

Hideyuki Sagawa

Masayoshi Goto

Shuji Sakai

Takahiko Hanada

A dilute copper alloy material includes, based on a total mass of the dilute copper alloy material, 2 to 12 mass ppm of sulfur, 2 to 30 mass ppm of oxygen, 4 to 55 mass ppm of titanium, and a balance of pure copper and inevitable impurity. A part of the sulfur and the titanium forms a compound or an aggregate of TiO, TiO, TiS or Ti&#x2014;O&#x2014;S, and an other part of the sulfur and the titanium forms a solid solution. TiO, TiO, TiS and Ti&#x2014;O&#x2014;S distributed in a crystal grain of the dilute copper alloy material are not more than 200 nm, not more than 1000 nm, not more than 200 nm and not more than 300 nm, respectively, in particle size thereof, and not less than 90% of particles distributed in a crystal grain of the dilute copper alloy material are 500 nm or less in particle size.

Dilute copper alloy material, dilute copper alloy wire, dilute copper alloy twisted wire and cable using the same, coaxial cable and composite cable, and method of manufacturing dilute copper alloy material and dilute copper alloy wire

A weldment includes metal materials that are welded to each other. At least one of the metal materials includes pure copper including an inevitable impurity, more than 2 mass ppm of oxygen, and an additive element selected from the group consisting of Mg, Zr, Nb, Fe, Si, Al, Ca, V, Ni, Mn, Ti and Cr. A method of manufacturing a weldment includes melting a dilute copper alloy material by SCR continuous casting and rolling at a molten copper temperature of not less than 1100&#xb0; C. and not more than 1320&#xb0; C. to make a molten metal, forming a cast bar from the molten metal, forming a dilute copper alloy member by hot-rolling the cast bar, and welding the dilute copper alloy member to a metal material. The dilute copper alloy material includes the pure copper, more than 2 mass ppm of oxygen, and the additive element,?

Weldment

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Hitachi, Japan

Hidenori Abe