Cangzhou China Hao steel pipe Limited company is one of northern region specialized production steel pipe's Major industries. This company in 2002 through ISO9001 quality control system authentication. The company has expands tube production line two. The company mainly aims at the international trade customer development service, mainly produces the sales seamless steel pipe series heat to expand the steel pipe series, the heat grips the steel pipe series, the ERW steel pipe series, the spiral steel pipe, the petroleum drive pipe series, the alloy-steel tube, each kind of thick wall seamless steel pipe, series and so on each kind of thick wall welded steel pipe, the product carries out GB code, the beautiful sign, the German sign and so on each national material quality standard. The