... , BS, ISO, GB, SH, AND HG etc MaterialCarbon Steel: ASTM A53/A106,ASTM A179,API 5L X42/52/60Surface treatmentBlack painting, anti-rust ... oil, hot galvanized,3PE coating, epoxy coating.PackingPlastic pipe cap, plastic bag, steel strips bundledApplicationsPetroleum,chemical,power,gas,metallurgy, shipbuilding, construction ... third-party certification to ensure our product quality. carbon steel pipe/ASTM