... steel tube 1.outer diameter:10-610mm 2.wall thickness:0.4-22mm 3.lenth:3mtr-18mtr product name: welded elliptic steel ... tubewelded elliptical steel tubes Oval hollow section Use for structure, ... Australia, Myanmar, Kenya, South Africa, Spain, Italy, France, England, Belgium, etc13.CertificatesAPI 5L , API 5CT, ISO ,CE welded elliptic steel tube