... are suitable for the industries of oil, natural gas, ship building, chemical, environmental protection, boiler, water conservancy, electrical ... industry, steel structure, building and other related fields.Our steel pipe has been ... L210, L245, L320, L360- L555STK400, STK500SurfaceLightly oiled, Hot dip galvanized, Electro galvanized, Black PackingPlastic plugs in both ...