... . standard: ASTM A500,EN10219,EN10210 3. origin:Tianjin,China Square Hollow Section-------Tianjin Yuanlitai Steel Pipe Co., Ltd.Our Steel Pipe (Customized ... air and non-hazardous gases,pressure purposes,applies to structural hollow sections, general structure purpose and pressure service etc.Shipment PeriodAccording ... pipe3,square pipe4,square pipe,square pipe,square pipe square hollow section