High Quality Steel Square Tube 
High Quality BEST SELLING
Chemical Composition & Mechanical Property
| Elements Material | Chemical Compsition% | Mechanical Property | ||||||
| C% | Mn% | S% | P% | Si% | Yield Point (Mpa) | Tensile Strength(Mpa) | Elongation (%) | |
| Q195 | 0.06-0.12 | 0.25-0.50 | <0.050 | <0.045 | <0.030 | >195 | 315-430 | 32-33 |
| Q215 | 0.09-0.15 | 0.25-0.55 | <0.05 | <0.045 | <0.030 | >215 | 335-450 | 26-31 |
| Q235 | 0.12-0.20 | 0.30-0.70 | <0.045 | <0.045 | <0.030 | >235 | 375-500 | 24-26 |
| Q345 | <0.20 | 1.0-1.6 | <0.040 | <0.040 | <0.55 | >345 | 470-630 | 21-22 |
| Hollow: | OD;10mmx10mm ~ 250mmx250mm Thickness;0.6mm-25mm |
| Bar: | OD;7mmx7mm ~ 25mmx25mm |
| Length: | 500mm-6000mm, can cut to length |
| Packing Details; | 1.in bulk 2.in bundles with steel strip,plastic cloth outside,then put into container 3.as per customers' requirement |
| Delivery Time; | 7 days for stock sizes, 20-25 days for new production sizes |
| Port: | Tianjin China |
Steel Materials; ASTM A53,ASTM A106 ASTM A210,ASTM A283,ST33, ST37-2,ST52, DIN1626,DIN1629,STPY41,G3452,G3457, S235,S355, Q195-Q235,Q345,20#, 45# ,alloy steel etc
QUALITY ASSURANCE
To avoid "no-return" damages to the supply project, the risks should be estimated so carefully and characterized in detail. Thus, importance of such quality-based approach makes a comprehensive quality management compulsory, not only for the production but also for the loading and shipment as well. Specifically determining the most appropriate production plan, inspiring our manufacturer partners to innovation and common senses for caring about the quality.Appointing (independent) "third party inspection" (TPI) organizations and coordinating the inspection plan of the production and loading steps.
These all assure the premium quality of our strategically project management.
Steel Products Can Be Supplied
Application
Q195/Q125/Q235/Q345 Supplier From China aluminium square tube High Quality Best Selling square steel tube
Construction, machinery manufacturing, steel construction project, shipbuilding, solar power stents, steel structure engineering, electrical engineering, power plant, agricultural and chemical machinery, glass curtain wall, car chassis, airport, boiler construction, highway railing, housing construction etc.
Square Bar Specification
Length (mm) | cm² | Theoretical Weight (kg/m) | Length (mm) | cm² | Theoretical Weight (kg/m) |
5 | 0.25 | 0.196 | 30 | 9.00 | 7.06 |
6 | 0.36 | 0.283 | 32 | 10.24 | 8.04 |
7 | 0.49 | 0.385 | 34 | 11.56 | 9.07 |
8 | 0.64 | 0.502 | 36 | 12.96 | 10.17 |
9 | 0.81 | 0.636 | 38 | 14.44 | 11.24 |
10 | 1.00 | 0.785 | 40 | 16.00 | 12.56 |
11 | 1.21 | 0.95 | 42 | 17.64 | 13.85 |
12 | 1.44 | 1.13 | 45 | 20.25 | 15.90 |
13 | 1.69 | 1.33 | 48 | 23.04 | 18.09 |
14 | 1.96 | 1.54 | 50 | 25.00 | 19.63 |
15 | 2.25 | 1.77 | 53 | 28.09 | 22.05 |
16 | 2.56 | 2.01 | 56 | 31.36 | 24.61 |
17 | 2.89 | 2.27 | 60 | 36.00 | 28.26 |
18 | 3.24 | 2.54 | 63 | 39.69 | 31.16 |
19 | 3.61 | 2.82 | 65 | 42.25 | 33.17 |
20 | 4.00 | 3.14 | 70 | 49.00 | 38.49 |
21 | 4.41 | 3.46 | 75 | 56.25 | 44.16 |
22 | 4.84 | 3.80 | 80 | 64.00 | 50.24 |
24 | 5.76 | 4.52 | 85 | 72.25 | 56.72 |
25 | 6.25 | 4.91 | 90 | 81.00 | 63.59 |
26 | 6.76 | 5.30 | 95 | 90.25 | 70.85 |
28 | 7.84 | 6.15 | 100 | 100.00 | 78.50 |
Other Products Specification
| Square Steel Tube (mm) | Rectangular Steel Tube (mm) | Round Steel Tube (mm) |
| 10×10×0.6~3.0 | 10×20×0.6~3.0 | 6x0.6~1.0 |
| 15×15×0.6~3.0 | 20×30×0.6~3.0 | 12x0.6~1.5 |
| 20×20×0.6~3.0 | 20×40×0.6~3.0 | 13x0.6~1.5 |
| 25×25×0.6~3.0 | 25×50×0.6~3.5 | 16x0.6~2.0 |
| 30×30×0.6~3.5 | 30×50×0.6~3.5 | 19x0.6~3.0 |
| 40×40×0.6~3.5 | 40×60×0.6~3.5 | 20x0.6~3.0 |
| 50×50×0.6~3.5 | 40×80×0.6~3.5 | 22x0.6~3.0 |
| 60×60×0.6~3.5 | 60×80×1.0~6.0 | 25x0.6~3.0 |
| 70×70×0.6~3.5 | 50×100×1.0~6.0 | 27x0.6~3.0 |
| 75×75×0.6~3.5 | 60×120×1.0~6.0 | 32x0.6~3.0 |
| 80×80×1.0~6.0 | 80×120×2.0~8.0 | 40x0.6~3.5 |
| 100×100×2.0~8.0 | 80×160×2.0~8.0 | 38x0.6~3.0 |
| 120×120×2.0~8.0 | 100×150×2.0~8.0 | 48x0.6~3.5 |
| 150×150×2.0~8.0 | 100×200×2.0~8.0 | 60x0.6~3.5 |
| 200×200×4.0~16.0 | 150×250×4.0~12.0 | 76x0.6~3.5 |
| 250×250×4.0~16.0 | 200×300×4.0~16.0 | 89x1.0~6.0 |
| 300×300×4.0~16.0 | 300×400×4.0~16.0 | 104x1.0~6.0 |
| 400×400×4.0~16.0 | 300×500×4.0~16.0 | 114x1.0~6.0 |
Production Flow
Detailed Images
1. What is your minimum order quantity?
For steel plate;one piece is ok. For steel pipe;one ton is ok.
Too litter quantity,the cost relatively high added fregiht. Larger quantity, better price.
2.How long will it take to receive my order?
7 days for stock sizes, 20-25 days for new product
3.Which type of shipping do you usually choose?
Packaging
when each plate weight is under 1 ton, it will be in bundle with steel strips 2-4, when each plate weight is over 1ton, it will be piece by piece.
20 feet container contains dimension:Width under 2300mm, length under 6000mm
40 feet container contains dimension:Width under 2300mm, length under 12000mm
By bulk vessel:Freight charge is low by bulk cargo, and large heavy sizes can not be loaded into containers can shipping by bulk cargo
4.Can I visit your company and factory?
100% sure. Our company and warehouse locate in Tianjin, where we can do great marketing and exporting.
If you want to visit us, please contact us to make an appointment.
5.How can I know my order has been done?
We will inspect and test all the goods before shipping.
We can send you pictures of the order; and also you can come or send someone to do the inspection.
Company Information
Tianjin Emerson Commercial and Trade Co.,Ltd has large stocks for the carbon steel and low alloy steel plates and sheets, especially have the thick plate and heavy plates on stock, also can provide the special material and large size steel plates, boiler and pressure vessel steel plate, marine steel plate, hot rolled steel plate for new production. Tianjin Emerson Commercial and Trade Co.,Ltd also has large stock for hollow bars, thick wall seamless pipes and tubes. Tianjin Emerson Commercial and Trade Co.,Ltd can provide good service for customer, good quality products, fast delivery, and after-sale service,
Tianjin Emerson hopes to build good cooperation with everyone interested.