Nippon Steel Corporation

Aisin Aw Co., Ltd.

Aisin Corporation

Masashi Sakakibara

Manabu Kubota

Tatsuya Koyama

Kei Miyanishi

Koji Obayashi

Kazuaki Okada

Keisuke Matsuzaka

In this steel component, the concentration of C in a surface layer is 0.85 mass % or more to 1.2 mass % or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.

Steel component, gear component, and producing method for steel component

Growing community of inventors

Handa, Japan

Masashi Sakakibara