Linfen straight seam Rectangular Pipe Manufacturers (specifications, prices, quality) wholesale straight seam Rectangular Pipe factory outlets, Rectangular Pipe Standard, square and rectangular tube wall thickness, square and rectangular tube prices, square and rectangular steel pipe wholesale square tube is in the kind of classification is based on the shape of pipe from a square shape of the hollow sections. This refers to steel as a material to form a square diameter pipe. Is a lightweight hollow square section steel tubes, also called cold-formed steel profiles. It is based on hot-rolled or cold-rolled strip or coil is blank by cold bending molding and then by high-frequency welded square cross-section shape and size of the beam. Hot-rolled square steel except special thick-walled outer wall thickening case, the corner sizing and edge flatness meet or exceed ERW cold formed square steel tube level. Square steel tube with square and rectangular shape of a square aperture, a circular variance process and roll forming process, a carbon steel materials and alloy steel, galvanized square steel surface coated or coated with anti-rust oil coating, thin-walled square tube and thick-walled square steel pipe. Mainly used in construction, machinery, shipbuilding, automotive, aerospace, chemical and other major industries. Square tube categories 1, by the production process: hot rolled square tube, cold drawn square tube, square tube extruded, welded square tube. Welded square steel tube which is divided into: (a) by technology - arc welding pipe, ERW square tube (high-frequency, low frequency), gas welding square tube, square tube furnace welding (b) at the weld points - Straight seam welded pipe, spiral welded square tube 2, Material: carbon steel square tube, low-alloy steel tube. Carbon steel is divided into: Q195, Q215, Q235, 20 #, 45 #, etc.; low-alloy steel into Q345, 16Mn and so on. 3, according to the standard of the production: the national standard GB/T6723-86, GB/T6728-2002, GB/T6725-2002, Japanese standard JISG3466-1988, JSS Ⅱ 10-1988, European Standard EN10219-2-1997, the agreement standards. 4, according to cross-sectional shape classification: (a) a simple square section steel - square pipe, rectangular square tube (2) complex section square tube - flower-shaped square tube, square tube-shaped openings, wavy square tube, shaped square tube 5 by surface treatment of: hot dip galvanized square pipe, galvanized pipe, oiled square tube, square tube 6 pickling by use classification - decorative square tube, square tube machine tool equipment, machinery and industrial pipe, chemical use square tube, square tube steel, shipbuilding square tube, square tube automobile, steel beams and columns with square tube, square tube 7 for special purposes, classification according to thickness - thin-walled square tube, thick-walled square tube square tube specifications Model square tube 800 * 800 * 4-30 Q235/Q345 square tube 600 * 600 * 4-30 Q235/Q345 square tube 500 * 500 * 4-30 Q235/Q345 square tube 550 * 550 * 4-30 Q235/Q345 party pipe 400 * 400 * 4-30 Q235/Q345 square tube 450 * 450 * 4-30 Q235/Q345 square tube 600 * 600 * 4-30 Q235 Q345 square tube 550 * 550 * 4-30 Q235 Q345 square tube 500 * 500 * 4-30 Q235 Q345 square tube 450 * 450 * 4-30 Q235 Q345 square tube 400 * 400 * 4-30 Q235 Q345 square tube 350 * 350 * 4-20 Q235 Q345 square tube 300 * 300 * 3-20 Q235 Q345 square tube 420 * 420 * 6-25 Q235 Q345 square tube 150 * 150 * 2-16 Q235 Q345 square tube 140 * 140 * 2-12 Q235 Q345 square tube 130 * 130 * 2-12 Q235 Q345 square tube 200 * 200 * 3-16 Q235 Q345 square tube 180 * 180 * 3-16 Q235 Q345 square tube 175 * 175 * 2-16 Q235 Q345 square tube 160 * 160 * 2-16 Q235 Q345 square tube 250 * 250 * 3-16 Q235 Q345 side pipe 400 * 600 * 3-22 Q235 Q345 square tube 300 * 600 * 3-20 Q235 Q345 square tube 200 * 600 * 3-20 Q235 Q345 square tube 300 * 300 * 3-20 Q235/Q345 square tube 350 * 350 * 4-20 Q235/Q345 square tube 250 * 250 * 3-16 Q235/Q345 square tube 300 * 600 * 3-20 Q235/Q345 square tube 400 * 600 * 3-22 Q235/Q345 square tube 200 * 200 * 3 - 16 Q235/Q345 square tube 100 * 100 * 3-12 Q235/Q345 straight seam Rectangular Pipe factory outlets, Rectangular Pipe Standard, square and rectangular tube wall thickness, square and rectangular tube prices, square and rectangular tube wholesale square tube widely used in construction engineering, steel structures, machinery manufacturing, shipbuilding industry, automotive, aerospace equipment, metallurgical industrial, agricultural equipment, plant greenhouses, railway facilities, highway guardrail, container frame, the furniture industry, as well as the field of decorative wall decoration pipe, machine equipment square tube, square tube industrial machinery, chemicals used square tube, square tube steel, shipbuilding square tube, square tube automobile, steel beams and columns with square tube, square tube, etc. for special purposes. 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