welded elliptic steel tube 1.outer diameter:10-610mm 2.wall thickness:0.4- ... . Export to theseCountriesCanada, USA, Peru, Chile, Colombia, Brazil, India, Malaysia, Singapore, Vietnamese, Australia, Myanmar, Kenya, South Africa, Spain, Italy, France, England ... , etc13.CertificatesAPI 5L , API 5CT, ISO ,CE welded elliptic steel tube