| Aichi Steelworks, Ltd. |
Nippon Metal Industry Co. |
| Alpolic Corporation |
Nippon Steel Corporation |
| Daido Steel Co., Ltd. |
Nippon Yakin Kogyo Co., Ltd. |
| Daido Steel Sheet Corporation |
Nisshin Steel Co., Ltd. |
| Japan Metals &. Chemicals |
Nkk Corporation |
| Kansai Wire Netting Co., Ltd. |
Pacific Sowa |
| Kawasaki Steel Corporation |
Sanyo Special Steel Co., Ltd. |
| Kobe Steel, Ltd. |
Sato-Shoji Corporation |
| Kobelco Construction Machinery Co., Ltd. |
Sumitomo Metal Industries |
| Kurimoto, Ltd. |
The Japan Steelworks Ltd. |
| Mitsubishi Steel Mfg Co., Ltd. |
Toyo Kohan Co., Ltd. |
| Nakayama Steel Works, Ltd. |
Uddeholm K.K. |
| Nippon Denko Co., Ltd. |
| | |