| Product Name | Square Tube |
| Technique | Hot rolled strip, Electric Resistance Weldinggalvanized square tube |
| Standard | GB/T6728-2002,GB/T6725-2002,GBT3094-2000,JG 178-2005,ASTM A500 JIS G3466,EN10210 |
| Grade | Q195, Q235,Q345,S235JR,St37-2 |
| Diameter | 10x10mm to 600x600mm |
| Thickness | 0.5mm-20mm |
| Length | 6m,9m, 12m, or other length as request |
| Surface Treatment | Oiled, black painted or hot dip |
| Packing | strapped with steel strips to prevent damage from transportation,wrapp by PP cloth |
| Applications | Structure pipe in constructions, low-pressur fluid service,bridge,highway,windows of model steel door, fence, heating facilities etc. |
| Size (mm) | Wall thickness (mm) | Theoretical weight (kg/m) | material |
| 20 x 20 | 1.0 - 2.5 | 0.58 - 1.40 | Q195, Q235 |
| 25 x 25 | 1.0 - 3.0 | 0.75 - 2.23 | Q195, Q235, Q345 |
| 30 x 30 | 1.5 - 3.5 | 1.35 - 3.08 | Q235, Q345 |
| 40 x 40 | 2.0 - 4.0 | 2.68 - 5.26 | Q235, Q345 |
| 50 x 50 | 2.0 - 5.0 | 3.47 - 8.25 | Q235, Q345 |
| 60 x 60 | 2.0 - 5.5 | 4.17 - 11.20 | Q235, Q345 |
| 80 x 80 | 3.0 - 6.0 | 7.68 - 15.03 | Q235, Q345 |
| 100 x 100 | 3.0 - 8.0 | 9.76 - 24.62 | Q235, Q345 |
| 120 x 120 | 4.0 - 8.0 | 13.60 - 32.10 | Q235, Q345 |
| 150 x 150 | 4.0 - 10.0 | 17.18 - 43.54 | Q235, Q345 |
| 200 x 200 | 5.0 - 12.0 | 26.82 - 64.90 | Q345, Q390 |
GB/T 4179 Angel Bar/Iron Carbon Steel 75 75mm Angle Steel
A:Buyers can confirm the quality of carbon steel square pipe by checking the quality certification (such as ISO, CE,etc.), requesting third-party testing reports, and checking the evaluation of other buyers.
A:Semi-Automatic PET Bottle Blowing Machine Bottle Making Machine Bottle Moulding Machine PET Bottle Making Machine is suitable for producing PET plastic containers and bottles in all shapes.
A:If the carbon steel square pipe is galvanized or other anti-corrosion treatment, it is suitable for outdoor use and can resist rain, moisture and other corrosive factors.
A:Yes, carbon steel square pipe can be customized according to customer needs size, material, surface treatment and length. Buyers should communicate specific requirements with suppliers to ensure that customized products meet the requirements.






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Step 1
Payment and order readiness
Minimum order: 5 Units
Payment terms, specifications, and order details are confirmed before preparation begins.
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Step 2
Preparation
7 days
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Step 3
Packaging and dispatch
Ocean + Express via FLY Logistics · Approx. shipping fee: $ 130.00 for 5 tons · Transit time: Est. 16-23 days
Final packing, freight, and delivery dates are confirmed before dispatch.
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