Siam Steel Service Center Plc., the affiliate of the Siam Steel Group, was established as a Thai - Japanese joint venture on September 30, 1985 under the investment between Siam Steel International Plc., and Japanese investors - Okaya & Co., Ltd., Mitsubishi Corporation and Toyota Tsusho Corporation.

The Okaya & Co.,Ltd., as the Company's majority Shareholder, holds 28 percent of the share capital. Okaya & Co.,Ltd., is a dealer for steel, machinery, pipe and chemical product. It has no marketing or customer base or running the same business as company in Thailand.