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Product Square Tube Process Electrical Resistance Weld Standard ASTM A53,ASTM A500, EN 10210 ,EN 10219, JIS G 3466 ,BS 1387 Material GRB,GRC,S235JR,S275JR,STK400,STK500 O.D 10*10-600*600MM W.T 0.5-20MM Length As per customer’s requirement Coating Oil.Galvanized coating Application Used for Structure Square Tube in china,Square Tube manufacturer