Square steel pipe material: Q195,Q235 , Q345,20#,45# etc. Siza:10*10-600* ... demaned CommoditySquare steel pipeMaterialQ195-Q345, GR.B,20#,45# etc.SpecificationERWLength3-17m or as your demandTreatmentgalvanized,oiled, painted black or ... as per customers' requestCertificatesGB3091-2001, ASTM A53, ASTM A106 EN10216,EN10219Manufacture Technique high frequency welded Packagingin bundles ...