hollow rectangular steel iron tube manufacture price Q195-Q235,20#,45#,A53 etc. Size:20x20- ... ,B)TechniqueHot rolled,cold rolled,cold drawnStandardBS,ASTM,GB/T,DIN,and etcSurface treatmentBare,oil,galvanized, according to the ... and infrared test or As customer requestedRemarks1)Payment terms:T/T or L/C at sight2)Trade terms:FOB/CFR ... according to customers' requirements hollow rectangular steel iron tube