Jtekt Corporation

Nippon Steel Sumitomo Metal Corporation

Tetsuya Hironaka

Tomohiro Yamashita

Yutaka Neishi

Takashi Sada

Kohei Kanetani

Takahiro Shimano

A bearing constituent member includes a base material including steel and a carbonitrided layer that is a surface layer on the steel, the steel including 0.3 to 0.45 mass % of carbon, 0.5 mass % or lower of silicon, 0.4 to 1.5 mass % of manganese, 0.3 to 2 mass % of chromium, 0.1 to 0.35 mass % of molybdenum, 0.2 to 0.4 mass % of vanadium, and a remainder of iron and unavoidable impurities. Surface Vickers hardness at a position at a depth of 50 &#x3bc;m from a surface of a rolling sliding surface is 700 to 800, internal hardness is 550 to 690 in terms of Vickers hardness, and an amount of residual austenite in a range from the surface to a depth of 10 &#x3bc;m is at least 30 vol %.

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Kashiba, Japan

Tetsuya Hironaka