Yantai Baosheng Steel Pipe Processing Co., Ltd. was established on July 27th, 20 10, and its main business scope is the processing and repair of seamless steel pipe rolling mandrels.
2. The special steel forging company under Tianjin Sairui Machinery Equipment Co., Ltd., which is a joint venture between Tianjin Steel Pipe Group Co., Ltd. and China Jingyang Engineering Technology Co., Ltd., successfully produced φ507mmH 13 mandrel, which is the largest outer diameter mandrel produced by the company since it was put into production.