... oil, galvanizedUsagePetroleum, chemical, power, gas, industrial, ship building, constructionContact :David John 86-15194009714 ZGL GROUP Certificate: ISO9001,API 5CT-0816,API ... METAL MANUFACTURING CO., LTDLIAOCHENG XINGLONG SEAMLESS TUBE MANUFATURING CO., LTDDavid John Sales ManagerAdd: No. 3 Taishan Road, Development Zone, Liaocheng, ChinaTel ...