• square and rectangular steel tube
• Formed: Cold bended and welded, Hot dip galvanized
• Material: Q195/Q235/Q345/A36/SS400
• Standard: GB/ASTM/
• Delivery: 1-10 day
• Packing: Nude packing/Canvas packing/Bundles packig
• Othe: We can make deep processing as customer's request, such as cutting, bending, welding, drilling holes etc.

Specification list:

HOT DIP GALVANIZED SQUARE HOLLOW SECTION GB/T6728-2002 GB/T6725-2008
NO	Specification(mm) W*W*T	Theoretical Weight (kg/m)	NO	Specification(mm) W*W*T	Theoretical Weight (kg/m)
1	20×20×1.7	1.068
2	20×20×1.8	1.130
3	20×20×2.0	1.256
4	25×25×1.7	1.335
5	25×25×1.8	1.413
6	25×25×2.0	1.570
7	25×25×2.2	1.727
8	25×25×2.5	1.963
9	25×25×3	2.355
10	30×30×1.7	1.601	33	50×50×4.5	7.065
11	30×30×1.8	1.696	34	50×50×5	7.850
12	30×30×2.0	1.884	35	60×60×1.7	3.203
13	30×30×2.2	2.072	36	60×60×1.8	3.391
14	30×30×2.5	2.355	37	60×60×2.0	3.768
15	30×30×3	2.826	38	60×60×2.2	4.145
16	40×40×1.7	2.135	39	60×60×2.5	4.710
17	40×40×1.8	2.261	40	60×60×3	5.652
18	40×40×2.0	2.512	41	60×60×3.5	6.594
19	40×40×2.2	2.763	42	60×60×4	7.536
20	40×40×2.5	3.140	43	80×80×2.2	5.526
21	40×40×3	3.768	44	80×80×2.5	6.280
22	40×40×3.5	4.396	45	80×80×3	7.536
23	40×40×4	5.024	46	80×80×3.5	8.792
24	50×50×1.7	2.669	47	80×80×4	10.048
25	50×50×1.8	2.826	48	100×100×2.5	7.850
26	50×50×2.0	3.140	49	100×100×3	9.420
27	50×50×2.2	3.454	50	100×100×3.5	10.990
28	50×50×2.5	3.925	51	100×100×4	12.560
29	50×50×3	4.710	52	100×100×4.5	14.130
30	50×50×3	4.710	53	100×100×5	17.270
31	50×50×3.5	5.495	54	120×120×7.5	28.260
32	50×50×4	6.280	55	150×150×5	23.550
The specification above are frequently used in China,and there are lots of stores in our warehouse. For other specifications which do not show in the table, you can touch me for confirming.

Shanghai T&T International who was started in 2009, has been committed to providing One-Stop steel & Iron products purchasing, customized and personalized steel & Iron products supply and consultancy services to customers both in China and abroad.

Products mainly include Electric Power Steel & Iron Products and Accessories, Greenhouse Steel & Iron Products and Accessories, Photovoltaic Support Bracket Steel & Iron Products and Accessories, and Other Steel & Iron Materials and Processing Accessories. After more than 10 years of development, with Hot-Dip Galvanizing Products as the leading products, our company has formed a series of customer service patterns, such as product design and development, production and processing, export matching, financial support and so on.
 

Main products include Galvanized (Hot-dip Galvanized & Pre-Galvanized) and No-Galvanized (Black) Welded Steel Tubes(SHS/RHS/CHS/DHS), Seamless Steel Pipe, Angle Steel, Channel steel (U-steel), I Beam/H Beam, Steel Plate/Sheet, and other Customized Steel such as C/U/Z Purlins, Machined Steel Parts and Steel Structure Parts which based on customers’ drawing or requirement.

Our products have been sold overseas for many years, and have formed a good reputation and brand in some government projects and industries. We have contributed a part of our strength to the development of infrastructure construction, green agriculture and energy construction, machinery and equipment manufacturing, urban construction and other industries, especially in Southeast Asia, Australia and Africa countries.

Entering the new era, we will continue to follow the direction of our national policy, respond to the government's "going global" and "The Belt and Road" strategy call, adapt to the development trend of economic globalization, provide more and better products for global customers, and share the fruits of development with all our customers.