Standard: astm, bs, astm a53-2007, bs 1387 Grade: a53-a369, q195-q345, a53(a, b), q195, q215, q235, q345 Thickness: 0.5 - 30 mm Section shape: square Outer diameter: 10*10-400*400 Place of origin: china (mainland) Secondary or not: non-secondary Application: structure pipe Technique: erw Certification: sgs.Bv Surface treatment: galvanized Special pipe: thick wall pipe Alloy or not: non-alloy Length: 1-12m Shape: square. Rectangular Quality: prtty good Commodity: erw pre galvanized steel pipe Galvanized pipe mtc is aviable: material test cert Screw thread: bs or astm thread Can visit factory: yes Have after-sales service: yes Color: silver Product name: 18x18 galvanized square steel pipe tube   1)product:   astm a53 q235 /q195/q345 galvanized square steel pipe/hollow section 2)size: round 20-273mm          square 10*10-250*250mm          rectangular10*20-150*200mm 3)thk:0.5-10mm 4)length:5.8m or 6m or as per customer request 5)hs code:7306309000 6)zinc coating:60-120g/m2 7)advantage: the same quality as hot dip galvanized pipe, but much cheaper than hot dip galvanized pipe         80reference price: 48*1.2mm   500$/ton fob tianjin 9)application: construction, greenhouse, feence, curtain ect Plz do feel free to let us know your request details, we will send the competitive price for your reference asap.