

Iron and Steel Producers
- Aichi Steel Corporation
- Azuma Precoat Co., Ltd.
- Osaka Steel Co., Ltd.
- Kyoei Kenzai, Ltd.
- Kyoei Steel, Ltd.
- Kubota Corporation
- Godo Steel, Ltd.
- Kobe Steel, Ltd.
- Sasaki Pipe Co., Ltd.
- Sanyo Special Steel Co., Ltd.
- Sanwa Column, Ltd.
- JFE Metal Products & Engineering Inc.
- JFE Galvanizing & Coating Co.,Ltd.
- JFE Steel Corporation
- Shinko Kenzai, Ltd.
- Nippon Steel & Sumikin Stainless Steel Corporation
- Nippon Steel Corporation
- Sumitomo Metal Steel Products Inc.
- Sumitomo Metal Industries, Ltd.
- Sumitomo Electric Industries, Ltd.
- Seikei Steel Pipe Corporation
- Daito Industry Co., Ltd.
- Daido Steel Co., Ltd.
- Pacific Metals Co., Ltd.
- Takasago Tekko K.K.
- Chuo Denki Kogyo Co., Ltd.
- Chubu Steel Plate Co., Ltd.
- Chiyoda Kotetsu Kogyo K.K.
- Tokai Color Co., Ltd.
- Toho Sheet & Frame Co., Ltd.
- Tohoku Steel Co., Ltd.
- Toyo Kohan Co., Ltd.
- Topy Industries, Ltd.
- The Nakayama Kasei Ltd.
- Nichia Steel Works, Ltd.
- Nisshin Steel Co., Ltd.
- Nisshin A&C Co., Ltd.
- Nittetsu Column Co., Ltd.
- Nittetsu Steel Sheet Corporation
- Nittetsu Kohan Metal Kenzai., Ltd.
- Nippon Kinzoku Co., Ltd.
- Nippon Metal Industry Co., Ltd.
- Nippon Koshuha Steel Co., Ltd.
- Japan Metals & Chemicals Co., Ltd.
- The Japan Steel Works, Ltd.
- Nippon Denko Co., Ltd.
- Nippon Yakin Kogyo Co., Ltd.
- Hitachi Metals, Ltd.
- Nachi-Fujikoshi Corp.
- Hokkai Koki Co., Ltd.
- Maruichi Steel Tube, Ltd.
- Mitsubishi Steel Mgf. Co., Ltd.
- Yodogawa Steel Works, Ltd.
Trading Companies
- Akira Kozai Co., Ltd.
- Asai Sangyo Co., Ltd.
- Marubeni-Itochu Steel Inc.
- Ntek Co., Ltd.
- Ohgitani Kogyo Co., Ltd.
- Ohmi Sangyo Co., Ltd.
- Okaya & Co., Ltd.
- Ogawa Shoten Co., Ltd.
- E. Katayama & Co., Ltd.
- Kanamori Co., Ltd.
- Kanehira Steel Co., Ltd.
- Kanematsu Corporation
- Canox Corporation
- Kawajyu Shoji Co., Ltd.
- Kinsho Corporation
- Kusano Co., Ltd.
- Koyo Trading Co., Ltd.
- Kojima Corporation
- Saicho Bussan Co., Ltd.
- Sakaguchi Trading Co., Ltd.
- Sato Shoji Corporation
- E. Sadoshima & Co., Ltd.
- The Sangyo Shinko Co., Ltd.
- Sanyo Co., Ltd.
- Shibamoto & Co., Ltd.
- Shinsho Corporation
- Sinď˝”suda Corporation
- Steel Center Co., Ltd.
- Sumikin Bussan Corporation
- Sumitomo Corporation
- Daisen Sangyo Co., Ltd.
- Tokyo Boeki, Ltd.
- Topy Enterprises, Ltd.
- Tomiyasu & Co., Ltd.
- Toyota Tsusho Corporation
- Nakamura Shoji Co., Ltd.
- Nakayama Trading Co., Ltd.
- Nishizawa, Ltd.
- Nittetsu Shoji Co., Ltd.
- Nihon Teppan Co., Ltd.
- Hakuyo Sangyo Co., Ltd.
- Hayakawa Co., Ltd.
- Hanwa Co., Ltd.
- Fukuei Steel Inc.
- Mitsui & Co., Ltd.
- Meiwa Corporation
- Metal One Corporation
- Morisada Corporation
- JFE Shoji Trade Corporation
Trading Associations