We, HYDROGRAND STEEL INDUSTRIAL CO., LTD 20-years' experience in steel pipes and pipe fittings, leading gas & oil pipeline, structure & pile pipe manufacturer in China; 5 years' vendor of GOPCO, PETROTRIN, Walvoss SRL, VDM-METAL GROUP, YPF, PETROTRIN., API, ISO & CE Certificated, This is how we keep good quality and competitive prices for global valued customers. Our steel pipes and fittings comply with national as well as international standards such as API, ASTM, DIN, JIS, ANSI ., etc.