Other

Shunzou Umegaki

Masahiro Suzuki

Youichi Watanabe

Ikuo Tani

Kiyotaka Akimoto

Yuichi Heishi

Keiji Yokose

A maraging steel is subjected to the aging to have a hardness of more than 500 Hv. A nitrided case is formed to have a depth that is about 20% to 50% to a &frac12; thickness of the maraging steel plate. An endless ring for a metal belt is constructed by the above maraging steel. According to methods of manufacturing the maraging steel and the endless ring, the nitrided case having the depth that is 20% to 50% of a distance from a plate surface to a center can be formed by executing an aging to have the hardness of more than 500 Hv, then executing a nitriding in the nitrogen atmosphere to which organic chloride is added.

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Yokohama, Japan

Shunzou Umegaki