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Shagang Group, a Jiangsu Province base and largest private steel enterprise in China has completed the development of K55-Cr oil casing pipe 6.85mm~7.85mm x 1320mm/1120mm along with enhanced tensile strength and reduction in carbon containment and yield percentage.This new development accelerated Shangang to put in prompt production in great volumes and hastened the competitiveness on oil casing pipe covering market in China region