Party Management of weight formula: 4 x thickness x (side length - wall thickness) x 7.85 where both sides and a wall thickness in millimeters, square tube prices directly to values ??into the above formula, each is drawn m square tube weight in grams. Such as 30 x 30 x 2.5 mm square tube, according to the above formula can calculate their weight per meter: 4 x 2.5 x (30-2.5) x 7.85 = 275 x 7.85 = 2158.75 g, Chongqing square tube, or about 2.16 kg When the wall thickness and side length are in millimeters, stainless steel pipe, 4 x thickness x (side length - wall thickness) is calculated volume per square meter length of the tube, in cubic centimeters, multiplied by iron the proportion of 7.85 grams per cubic centimeter, is obtained in grams per meter square tube weight units. Product performance standards: GB / T3094-2000 (GB) cold-shaped rectangular tube GB / T6728-2002 (GB) Cold formed hollow sections ASTMA500 (ANSI) structural carbon steel cold forming circular section and profiled??? rectangular cross-section welded pipe and seamless rectangular tube EN10219-1-2006 (European standard)? cold formed welded structural hollow sections of non-alloy and fine grain JIS of? G? 3466 (Japanese standard) general structure seamless rectangular tube with angle square tube, around the steel association (certified), Chongqing square tube from the Tianjin Steel Trade Co., Ltd. Mastery. Mastery of Tianjin Steel Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) Shandong Liaocheng, steel leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Mastery Steel Union leaders in the staff warmly welcome all inquiries negotiations to create accessible VAI better future.