Yantai baosheng steel pipe processing co., ltd. was established in 2002, with a registered capital of 3 million yuan. The company covers an area of more than 30,000 square meters and the annual output value reaches more than 52 million yuan. Since its establishment, the company has always adhered to the business philosophy of "survival by quality, development by efficiency", "advancing with The Times and innovation". In 2010, through the joint efforts and continuous development of all employees of the company, the company has now independently produced ZZB series screw oil pump and rotor oil pump. The business scope of the company is as follows: 1. Repair and processing of rolling mandrel of seamless steel tube, laser meter quenching, surface alloying and cladding; 2. Protection ring for thread of petroleum pipe (isolation ring and full steel tube end protector).