Tanaka Kikinzoku Kogyo K.k.

Takeshi Fuse

Kunihiro Shima

Takeyuki Sagae

Shinji Kouno

A probe pin material including a Ag&#x2014;Pd&#x2014;Cu-based alloy essentially including Ag, Pd and Cu, B as a first additive element, and at least any element of Zn, Bi and Sn, as a second additive element. A concentration of the first additive element is 0.1 mass % or more and 1.5 mass % or less, and a concentration of the second additive element is 0.1 mass % or more and 1.0 mass % or less. A Ag concentration, a Pd concentration and a Cu concentration in the Ag&#x2014;Pd&#x2014;Cu-based alloy are required as follows: a Ag concentration (S), a Pd concentration (S) and a Cu concentration (S) converted as given that a Ag&#x2014;Pd&#x2014;Cu ternary alloy is formed from only such three elements all fall within a predetermined range in a Ag&#x2014;Pd&#x2014;Cu ternary system phase diagram. The probe pin material is excellent in resistance value and hardness/wear resistance, and also is enhanced in bending resistance.

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Isehara, Japan

Takeshi Fuse