... ,gas conveying5.Cert.: ISO,API-------------------------------------------Detailed Product DescriptionHunan new materials industry Group deal with all kinds of steel pipes like following:1 ... ~10 tons16Quality CertificateISO, API, Mill Test Certificate17Contact:Hunan New Materials Industry Group Co., LtdAdd.: 333, Wuyi Road, Changsha, Hunan, ChinaTel: 0086-731 ...