Introduction to square tube

April 19 11:08:12, 2023



Square tube is a kind of square tube and rectangular tube, which is a steel tube with equal sides. It is a strip of steel that has been processed and rolled. Generally, the strip is unpacked, flattened, crimped, welded to form a round tube, and then rolled into a square tube by a round tube and then cut into a desired length. Usually 50 per pack.



Also known as square and rectangular cold-formed hollow steel, referred to as square tube and rectangular tube, codenamed F and J respectively



1. The allowable deviation of the wall thickness of the rectangular tube shall not exceed 10% of the nominal wall thickness when the wall thickness is not more than 10 mm, and the positive and negative 8% of the wall thickness when the wall thickness is greater than 10 mm, the angle and the weld area Except for wall thickness.



2. The normal delivery length of the rectangular tube is 4000mm-12000mm, which is mostly 6000mm and 12000mm. The square tube allows the delivery of short and non-scheduled products of not less than 2000 mm, and can also be delivered in the form of an interface tube, but the interface tube should be removed during use. The weight of short and non-scheduled products shall not exceed 5% of the total delivery volume, and the square tube with theoretical weight greater than 20kg/m shall not exceed 10% of the total delivery volume.


Square tube




3. The bending of the rectangular tube shall not exceed 2 mm per meter, and the total bending shall not exceed 0.2% of the total length.


Edit this paragraph classification introduction 1, square tube production process classification square tube according to the production process: hot-rolled seamless square tube, cold drawn seamless square tube, extruded seamless square tube, welded square tube. The welded square tube is further divided into: (a) according to the process points - arc welded square tube, resistance welded square tube (high frequency, low frequency), gas welded square tube, furnace welded square tube (b) according to the weld seam - straight Seam welded square tube, spiral welded square tube
2, square tube material classification square tube by material: ordinary carbon steel square tube, low alloy square tube. The carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.; low alloy steel is divided into Q345, 16Mn, Q390, ST52-3 and so on.
3, square tube production standard classification square tube according to production standards: national standard square tube, Japanese standard square tube, inch square tube, American standard square tube, European standard square tube, non-standard square tube.
4, square tube section shape classification square tube according to the shape of the section: (1) simple section square tube - square square tube, rectangular square tube (2) complex section square tube - flower square tube, open square tube, ripple Square tube, shaped square tube
5, square tube surface treatment classification square tube according to surface treatment points: hot-dip galvanized square tube, electro-galvanized square tube, oil-coated square tube, pickled square tube
6, square tube use classification square tube according to the purpose of classification - decorative square tube, machine tool equipment square tube, mechanical industrial square tube, chemical square tube, steel structure square tube, shipbuilding square tube, automotive prescription Square tube for tube and steel beam column, special purpose square tube
7. Square tube wall thickness classification square tube classification according to wall thickness - ultra thick wall square tube, thick wall square tube and thin wall square tube



Executable standard



GB/T6728-2002, GB/T6725-2002, GBT3094-2000, JG 178-2005, ASTM A500 JIS G3466, EN10210 or technical agreement Application areas: widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses , automotive industry, railways, highway guardrails, container skeletons, furniture, decoration, and steel structures, etc.



Flow chart steel pipe index



Square moment theory weight calculation method: (edge ​​length + side length) × 2 × wall thickness × 0.00785 × length



Product implementation standard: GB/T3094-2000 (national standard) cold pressed shaped rectangular tube



GB/T6728-2002 (GB) Cold-formed hollow steel for structural use



ASTM A500 (American Standard) structure with carbon steel cold-formed circular and profiled welded rectangular tubes and seamless rectangular tubes



EN10219-1-2006 (European standard) Cold-formed welded hollow structural profiles of non-alloy and fine-grain



JIS G 3466 (Japanese standard) Angled rectangular tube for general construction



Seamless square tube product material: Q235, Q345 (16Mn), 20#, alloy steel, stainless steel.



Square tube product use: mechanical equipment, solar equipment, steel structure, automotive parts, bridge piles, guardrails, ship internal structure.


Edit this paragraph specification model
Square tube specifications (mm)
16×16×0.4～1.5 380×380×8.0～14.0 10×20×0.6～1.5 250×150×6～12.0
18×18×0.4～1.5 400×400×8.0～14.0 14×21×0.6～1.5 250×100×6～12.0
20×20×0.4～1.5 420×420×10.0～14.0 15×30×1.5～1.5 250×200×6～12.0
25×25×0.6～2.0 450×450×10.0～14.0 15×38×0.6～1.5 300×150×6～12.0
30×30×0.6～4.0 480×480×10.0～14.0 20×30×0.6～2.0 300×200×6～12.0
34×34×1.0～2.0 500×500×10.0～14.0 20×40×0.8～2.0 300×250×6～12.0
35×35×1.0～4.0 The other specifications are as follows 20×50×1.0～2.0 400×250×8～12.0
38×38×1.0～4.0 550×550×10.0～40.0 22×35×0.9～2.0 400×300×8～12.0
40×40×1.0～4.5 600×600×10.0～40.0 25×40×0.9～3.75 450×200×8～12.0
44×44×1.0～4.5 700×700×10.0～40.0 25×65×1.0～2.0 450×250×8～12.0
45×45×1.0～5.0 800×800×10.0～50.0 30×40×1.0～3.75 400×300×8～12.0
50×50×1.0～5.0 900×900×10.0～50.0 30×45×1.0～3.75 400×350×8～12.0
60×60×1.5～5.0 1000×1000×10.0～50.0 30×50×1.0～4.0 500×200×10～12.0
70×70×2.0～6.0 30×60×1.0～4.5 500×250×10～12.0
75×75×2.0～6.0 40×50×1.0～4.5 500×300×10～12.0
80×80×2.0～6.0 40×60×1.0～5.0 500×350×10～12.0
85×85×2.0～6.0 40×80×1.5～5.0 500×400×10～12.0
95×95×2.0～8.0 40×100×2.0～5.0 500×450×10～12.0
100×100×2.0～8.0 50×60×2.0～5.0 The other specifications are as follows
120×120×4.0～8.0 50×80×2.0～5.0 600×200×10～28.0
150×150×6.0～10.0 50×100×2.0～8.0 600×400×10～28.0
180×180×6.0～12.0 60×80×2.0～6.0 600×500×10～28.0
200×200×6.0～12.0 80×100×2.0～8.0 800×400×10～28.0
220×220×6.0～14.0 120×60×2.5～10.0 800×600×10～28.0
250×250×6.0～14.0 120×80×2.5～10.0 800×700×10～28.0
280×280×6.0～14.0 150×100×2.5～12.0 1000×400×10～28.0
300×300×8.0～14.0 180×150×2.5～12.0 1000×500×10～28.0
320×320×8.0～14.0 200×100×4～12.0 1000×600×10～28.0
350×350×8.0～14.0 200×150×4～12.0 1000×800×10～28
1. The straight rectangular tube can be used as the straight square square tube and the seamless square tube. The special specifications can be customized.



2. Implementation standards: GB/T6728-2002, ASTM, JIS or technical agreement.



3. Square tube material: Q195-235B, Q345 (B, C), 16Mn, 20#, 45#, 20MN2.

'Introduction to square tube

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