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 Features 1, square tube square tube is a product description of hollow square cross-section of light thin-walled pipe, also known as cold-formed steel profiles. It is a square cross-sectional shape and size Q235 steel hot-rolled or cold-rolled strip or coil of the base material after the cold bending molding made by high-frequency welding. Hot-rolled special thick-walled square tube wall thickness thickening of the outer case except that the corner sizing and edge flatness meet or exceed the resistance welding cold forming square tube level. Good mechanical properties, weldability, cold, heat processing performance and corrosion resistance are good, with good low temperature toughness. 2, square tube square tube uses include use in construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar bracket, steel works, electrical products square tube square tube products (3) power engineering, power plants, agricultural and chemical machinery , glass walls, car chassis, airports, boiler construction, highway railings, building construction, pressure vessels, oil storage tanks, bridges, power station equipment, material handling equipment and other welded structure of high load and other product descriptions RHS divided by the production process: hot-rolled seamless pipe, cold drawn seamless pipe, extruded seamless pipe, welded square tube. Welded square tube which is divided into: (a) according to process sub - arc welding pipe, ERW square tube (high frequency, low frequency), welding pipe, square tube furnace brazed (b) by weld points - straight seam welded pipe, spiral welded square tube square tube material classification Material: carbon steel square tube, low-alloy square tube. Carbon steel is divided into: Q195, Q215, Q235, SS400,20 # steel, 45 # steel; low-alloy steel into Q345,16Mn, Q390, ST52-3 like. Standard Classification of square tube production according to the production standard score: GB square tube, the standard square tube, inch pipe, American standard tube, square tube European standard, non-standard square tube. Sectional shape by cross-sectional shape of square tube classify classification: (1) simple section square tube - square pipe, rectangular square tube (2) complex section square tube - flower-shaped square tube, opening shaped pipe, corrugated pipe, shaped square tube square tube surface treatment classified according to sub-surface treatment: hot dip galvanized pipe, galvanized pipe, oiled square tube, square tube pickling use classification RHS By Application - decorative square tube, square machine tools pipes, industrial machinery square pipe, chemical pipe, square steel pipe, shipbuilding pipe, automobile pipe, steel beams with square tube, square tube for special purposes by the wall thickness of the pipe wall thickness classification classification - - Ultra thick-walled square tube, thick-walled pipes and thin-walled square tube performance standards, and procedures GB / T6728-2002, GB / T6725-2002, GBT3094-2000, JG 178-2005, ASTM A500 JIS G3466, EN10210 or technical protocol application : widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automotive, railway, highway guardrail, container framework, furniture, decoration and steel areas such as management flow chart on the square and rectangular steel index weight method :( side + side length) × 2 × thickness × 0.00785 × length Product Standard: GB / T3094-2000 (GB) cold-shaped rectangular tube GB / T6728-2002 (GB) Cold formed hollow steel ASTM A500 (American Standard) structural carbon steel cold forming circular section and profiled welded rectangular tubes 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 construction with rectangular tube angle seamless Rectangular Pipe Material: Q235, Q345 (16Mn), 20 #, alloy steel, stainless steel. Rectangular Pipe Usage: machinery and equipment, solar energy equipment, steel, automotive parts, bridge pile, fence, internal structure of the ship. Manufacturers Sales Tel: 18865212778 integrity management quality to ensure timely delivery