for water steel pipes.10.materialq345,16mn, st52;etc11.usagefor petroleum/ natural gas pipeline , for conveying water,drainage,coal gas, mineral slurry and other low-middle pressure liquids. also for chemical industry, building structure,heat-supply and pile driving projects.12. export tocanada, usa, argentina,peru, chile, colombia, brazil, venezuela,malaysia, singapore, the czech republic, australia, myanmar, kenya, south africa, spain, italy, france, england, the netherlands,belgium, etc13.certificatesnsic; iso9001:200014.application: seamless ...