Carbon steel (SMLS/ERW) pipes 1.Surface Treatment: Galvanized,oil,painted etc 2.Specification:ASTM/ ... /42 X42/52,J55 etc1)SMLS/ERW carbon steel pipe2) Used for oil well, boilers, precision machines, petro-chemical, ship, structure ... thickness: 625mmany other size on agreement( Carbon steel (SMLS/ERW) pipes