| A ichi 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. |
| Ltd.Mitsubishi Steel Mfg Co., Ltd. | Toyo Kohan Co., Ltd. |
| Nakayama Steel Works, | Uddeholm K.K. |
|
Nippon Denko Co., Ltd. |