Rectangular and Square Steel PipeO.D.:15*15MM~150*300MM W.T.:1.2MM~16MM we can offer you lowest price in china Product NameSquare Steel PipeSizeOD20~3020mm In TheoryThickness1.0~32mmLengthAny Length Below 16 MeterStandardAPI 5LMaterialGrade B,X42,X46,X52,X56,X60,X65,X70,etcUsagePSL-1 Class IS 100% Qualified To Petroleum And Gas Industry,PSL-2 Can Be Used In Refinery And Chemical PlantEndsPlain, ...