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Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or well bore. , Api 5l Grade X42 Line Pipe Steel Grade API 5L A, B, X42, X46, X52, X56, X60, X65 X70 , Api 5l Grade X42 Line Pipe SEAMLESS LINE PIPE. H.S CODE 7304 Model Export area Introduction: