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Square tube
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Thick-walled square pipe specification table（mm） |
Thick wall rectangular tube specification table（mm） |
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16×16×0.4～1.5 |
380×380×8.0～30.01 |
10×20×0.6～1.5 |
250×150×6～12.0 |
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18×18×0.4～1.5 |
400×400×8.0～30.0 |
14×21×0.6～1.5 |
250×100×6～12.0 |
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20×20×0.4～1.5 |
420×420×10.0～30.0 |
15×30×1.5～1.5 |
250×200×6～30.0 |
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25×25×0.6～2.0 |
450×450×10.0～30.0 |
15×38×0.6～1.5 |
300×150×6～30.0 |
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30×30×0.6～4.0 |
480×480×10.0～30.0 |
20×30×0.6～2.0 |
300×200×6～30.0 |
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34×34×1.0～2.0 |
500×500×10.0～30.0 |
20×40×0.8～2.0 |
300×250×6～30.0 |
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35×35×1.0～4.0 |
The other specifications are as follows |
20×50×1.0～2.0 |
400×250×8～30.0 |
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38×38×1.0～4.0 |
550×550×10.0～40.0 |
22×35×0.9～2.0 |
400×300×8～30.0 |
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40×40×1.0～4.5 |
600×600×10.0～40.0 |
25×40×0.9～3.75 |
450×200×8～30.0 |
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44×44×1.0～4.5 |
700×700×10.0～40.0 |
25×65×1.0～2.0 |
450×250×8～30.0 |
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45×45×1.0～5.0 |
800×800×10.0～50.0 |
30×40×1.0～3.75 |
400×300×8～30.0 |
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50×50×1.0～5.0 |
900×900×10.0～50.0 |
30×45×1.0～3.75 |
400×350×8～30.0 |
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60×60×1.5～5.0 |
1000×1000×10.0～50.0 |
30×50×1.0～4.0 |
500×200×10～30.0 |
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70×70×2.0～6.0 |
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30×60×1.0～4.5 |
500×250×10～30.0 |
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75×75×2.0～6.0 |
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40×50×1.0～4.5 |
500×300×10～30.0 |
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80×80×2.0～6.0 |
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40×60×1.0～5.0 |
500×350×10～30.0 |
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85×85×2.0～6.0 |
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40×80×1.5～5.0 |
500×400×10～30.0 |
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95×95×2.0～8.0 |
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40×100×2.0～5.0 |
500×450×10～30.0 |
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100×100×2.0～8.0 |
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50×60×2.0～5.0 |
另改拔规格如下 |
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120×120×4.0～8.0 |
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50×80×2.0～5.0 |
600×200×10～28.0 |
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150×150×6.0～10.0 |
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50×100×2.0～8.0 |
600×400×10～28.0 |
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180×180×6.0～12.0 |
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60×80×2.0～6.0 |
600×500×10～28.0 |
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200×200×6.0～30.0 |
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80×100×2.0～8.0 |
800×400×10～28.0 |
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220×220×6.0～30.0 |
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120×60×2.5～10.0 |
800×600×10～28.0 |
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250×250×6.0～30.0 |
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120×80×2.5～10.0 |
800×700×10～28.0 |
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280×280×6.0～30.0 |
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150×100×2.5～12.0 |
1000×400×10～28.0 |
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300×300×8.0～30.0 |
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180×150×2.5～12.0 |
1000×500×10～28.0 |
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320×320×8.0～30.0 |
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200×100×4～12.0 |
1000×600×10～28.0 |
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350×350×8.0～30.0 |
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200×150×4～12.0 |
1000×800×10～28 |
Also known as square and rectangular cold-formed hollow section steel, abbreviated as square tube and rectangular tube, the codes are F and J respectively
1. The allowable deviation of the wall thickness of the rectangular tube shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is less than 10mm, and plus or minus 8% of the wall thickness when the wall thickness is greater than 10mm, corners and weld areas Except for wall thickness.
2. The usual delivery length of rectangular tube is 4000mm-12000mm, with 6000mm and 12000mm being the majority. Rectangular pipes are allowed to deliver short-length and non-fixed-length products not less than 2000mm, and can also be delivered in the form of interface pipes, but the buyer should cut off the interface pipe when using it. The weight of short-length and non-fixed-length products should not exceed 5% of the total delivery volume, and for square rectangular tubes with a theoretical weight greater than 20kg/m, it should not exceed 10% of the total delivery volume.
3. The curvature of the rectangular tube shall not be greater than 2mm per meter, and the total curvature shall not be greater than 0.2% of the total length
Classificationedit
Process classification
Rectangular tubes are classified according to the production process: hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes, and welded square tubes.
Among them, the welded square tube is divided into
1. According to the process-arc welding square tube, resistance welding square tube (high frequency, low frequency), gas welding square tube, furnace welding square tube
2. According to welding seam-straight seam welded square pipe, spiral welded square pipe.
Material classification
Square pipes are classified according to their materials: plain carbon steel square pipes and low-alloy square pipes.
1. Common carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.
2. Low alloy steel is divided into: Q345, 16Mn, Q390, ST52-3, etc.
Production standard classification
Square pipes are classified according to production standards: national standard square pipes, Japanese standard square pipes, imperial square pipes, American standard square pipes, European standard square pipes, and non-standard square pipes.
Section shape classification
The square tube is classified according to the shape of the section:
1. Simple section square pipe: square square pipe, rectangular square pipe.
2. Square tube with complex section: flower-shaped square tube, open-shaped square tube, corrugated square tube, special-shaped square tube.
Surface treatment classification
According to the surface treatment, the square pipe is divided into: hot-dip galvanized square pipe, electro-galvanized square pipe, oil-coated square pipe, pickling square pipe.
Use classification
Square pipes are classified by purpose: square pipes for decoration, square pipes for machine tools, square pipes for machinery industry, square pipes for chemical industry, square pipes for steel structures, square pipes for shipbuilding, square pipes for automobiles, square pipes for steel beams and columns , Special purpose square tube.
Wall thickness classification
Rectangular pipes are classified according to their wall thickness: ultra-thick-walled rectangular pipes, thick-walled rectangular pipes and thin-walled rectangular pipes.
Executive standardedit
GB/T6728-2002, GB/T6725-2002, GBT3094-2000, JG 178-2005, ASTM A500 JIS G3466, EN10210 or technical agreement.
GB/T3094-2000 (National Standard) Cold Pressed Shaped Rectangular Pipe
GB/T6728-2002 (National Standard) Cold-formed hollow section steel for structure
ASTM A500 (American Standard) Carbon steel cold-formed round and special-shaped cross-section welded rectangular pipes and seamless rectangular pipes for structural use
EN10219-1-2006 (European Standard) Non-alloy and fine-grain cold-formed welded hollow structural profiles
JIS G 3466 (Japanese standard) Angle rectangular tube for general structure
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