Japan Steel
Tokyo Steel Co. Ltd.
Kobe Steel Group
Sumitomo Light Metal Industries
Sumitomo Metal Industries Ltd
Mitsubishi Steel Mfg. Co., Ltd.
Nippon Light Metal Co. Ltd.
Nippon Steel Corporation
Nisshin Steel Co. Ltd.
Maruichi Steel Tube Ltd
JFE Steel Corp
Daido Steel Co., Ltd.
IHI Group