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Tianjin RuiTong Iron & Steel Co., LTD.![]() Profile Certified by SGS/BV
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Building Material Tianjin Ruitong C350L0 Hollow Steel Steel Tube Square Pipe
Tianjin RuiTong Iron & Steel Co., LTD.API OCTG Steel Casing and Tubing - Oilfield Service J55/K55/N80/P110.
Tianjin Tiangang Special Petroleum Pipe Manufacture Co., Ltd.