Gr B Carbon Seamless Steel Pipe Api 5l X60 Gost 20295 En10204 3.1/iso 10474 3.1b Shape Welding Oil Pipeline Iso Gs Certified - Buy Gr B Carbon Seamless Steel Pipe Gost 20295 En10204 3.1/iso 10474 3.1b Api 5l X60 Carbon Steel Seamless Pipe Suppliers api 5l X60 Carbon Steel Seamless Pipe Suppliers En10204 3.1/iso 10474 3.1b Carbon Steel Pipe gost 20295 Carbon Lsaw Welded Steel Pipe Suppliers Gr B Carbon Seamless Steel Pipe Price Suppliers Product on Alibaba.com