galvanized square steel pipe 1.Thickness:0.6 - 10 mm 2.Size:15*15-400*400mm 3.Grade:Q195,Q215,Q235,Q345 Square Steel PipeDimensions:15*15mm-400*400mm(1/2''*1/2''-16''*16'')Thickness:0.6-10mmLength:0.305-12m(1-40ft)ProcessMethod:cold draw /High frequency weldedSteel grade :Q195,Q215,Q235,Fe310,Fe360,St33,St330,St37-2,SS330,SS400,ASTM1010,ASTM1017,ASTM1020Manufactured to meet ISO9001,ASTM,DIN,BS,GB ...