Kao Corporation

Miyoshi Gokin Kogyo Co., Ltd.

Ihi Corporation

Genjiro Hagino

Masato Arai

Shuji Tagata

Yuta Arai

Hayao Eguchi

Mutsuki Ishijima

Yoshihito Ogasawara

Shintaro Fujii

Masaaki Yamane

Hideharu Ito

Sachiko Noguchi

Sachiko Kamioka

A wear-resistant copper-zinc alloy includes in mass %, 28 to 55% Zn, 0.5 to 2% P, and a balance of Cu and unavoidable impurities, and the wear-resistant copper-zinc alloy has an electrical conductivity of 10 to 33% IACS and a hardness of 3.6[Zn]-55 HBW or more, where [Zn] denotes the Zn content in mass %. Alternatively, a wear-resistant copper-zinc alloy includes in mass %, 40 to 55% Zn, 1 to 6% Mn, and a balance of Cu and unavoidable impurities, and the wear-resistant copper-zinc alloy has an electrical conductivity of 10 to 33% IACS and a hardness of 3.6[Zn]-55 HBW or more, where [Zn] denotes the Zn content in mass %.

Wear-resistant copper-zinc alloy and mechanical device using same

Provided is a copper alloy tube that is a drawn tube made from a CuCrZr alloy which suppresses the deterioration of mechanical strength and, in particular, the coarsening of crystal grains even in a temperature zone of a solutionizing treatment, and is thus excellent in high-temperature brazeability, as well as the manufacturing method therefor. The manufacturing method comprises a solutionizing step of heating and holding a tubular extrusion material at a solutionizing temperature of 900&#xb0; C. or greater and then water-quenching the tubular extrusion material; a main process step comprising a set of steps including a drawing process step of drawing the tubular extrusion material, and an intermediate annealing step of heating at an annealing temperature and then water-quenching the drawn material; and an adjusting process step of further drawing the drawn material and setting average crystal grain sizes in a vertical cross section along an axis as well as a horizontal cross section orthogonal to the axis to 50 &#x3bc;m or less each. The average crystal grain sizes of the vertical cross section and the horizontal cross section are each set to 100 &#x3bc;m or greater and the annealing temperature is set to 900&#xb0; C. or greater after the solutionizing step, thereby making it possible to make the average crystal grain sizes of the vertical cross section and the horizontal cross section 100 &#x3bc;m or less after the adjusting process step, even if heating is performed at at least 980&#xb0; C. for 30 minutes followed by air-cooling.

Copper alloy tube with excellent high-temperature brazeability and manufacturing method therefor

A powdery detergent composition having a high detergency and an excellent storage stability (caking resistance), and comprising (a) a chelating agent composed of a compound having an average degree of neutralization in a molecule of 20 to 70%, a molecular weight of 600 or less, the number of carboxyl groups contained in one molecule of 3 to 5, and a constant of a chelating stability with Ca,of 6 to 13, (b) an alkali agent composed of a compound a 0.1% by weight aqueous solution or dispersion of which has the maximum pH of 10 or more at 20&deg; C., at least 5 ml of 0.1 N HCl aqueous solution being required to adjust 1 liter of the aqueous solution or the dispersion to pH 9, and (c) a surfactant at specific ratios, respectively.

Powdery detergent composition containing a partially neutralized chelant

Detergent composition

Growing community of inventors

Tokyo, Japan

Genjiro Hagino