About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Square tubes (SHS steel) are cold-formed or hot-rolled steel profiles with equal width and height and a square cross-section. Common steel grades include S275, S355, and ASTM A500. SHS steel possesses excellent load-bearing capacity and torsional strength. These steel profiles are available in a variety of sizes, thicknesses, and lengths, and are typically surface-treated with protective coatings such as galvanizing or painting to enhance their corrosion resistance.
SHS steel is manufactured according to stringent international standards to ensure quality and performance. Key standards include:
|
Standard |
Region/Country |
Material Type |
Typical Grade |
|
ASTM A500 |
USA |
Cold-formed carbon steel |
Grade A, B, C |
|
ASTM A513 |
USA |
Mechanical tubes |
Type 1, 2, 5 |
|
Europe |
Hot-finished / Cold-formed |
S235, S275, S355 |
|
|
GB/T 6728-2017 |
China |
Structural steel |
Q195, Q235, Q345 |
|
JIS G3466 |
Japan |
Structural carbon steel |
STKR400, STKR490 |
|
AS/NZS 1163 |
Australia |
Cold-formed steel |
C250, C350, C450 |
These standards specify the dimensional tolerances, mechanical properties, and chemical composition required for various structural applications.
Commonly available sizes include 10×10, 12×12, 14×14, 16×16, 18×18, 20×20, 25×25, 30×30, and 40×40 mm.
Common wall thicknesses include 0.6mm, 0.7mm, 0.8mm, 1.0mm, 1.2mm, and 1.5mm. Smaller outer diameter square tubes generally have thinner walls, while larger diameter square tubes have relatively thicker walls.
Standard lengths: 6m, 9m, and 12m; custom cutting services are available.
SHS steel is produced using various steel grades based on mechanical properties, strength requirements, and application needs. The following is an overview of some of the most commonly used steel grades globally:
S235 → Standard structural steel with good weldability and medium strength; used for light to medium-duty structures.
S275 → Higher strength than S235; commonly used in general construction and light manufacturing.
S355 → High-strength structural steel with good toughness and excellent weldability; ideal for heavy and load-bearing applications.
S420 / S460 → Ultra-high-strength structural steel; used for critical load applications, bridges, marine, and special engineering projects.
ASTM A500 A, B, C grades → Cold-formed carbon steel, commonly used in the North American market.
Small Square Tubes: 15×15, 20×20, 25×25, 30×30, 40×40
Medium Square Tubes: 50×50, 60×60, 80×80, 100×100
Large Square Tubes: 120×120, 150×150, 200×200, 300×300, 400×400
Thin-walled Square Tubes: 1.0~3.0mm (Decorative, Furniture)
Medium-thick-walled Square Tubes: 3.0~8.0mm (Building Structures, Machinery)
Thick-walled Square Tubes: 8.0~18.0mm (Heavy Steel Structures, Bridges)
|
Length * Width * Thickness |
SHS Steel Weights (6 M) |
SHS Steel Steel Grades |
|
15*15*1.50 MM |
4.21 KG |
S235 JRH – ST 37 |
|
20*20*1.50 MM |
5.61 KG |
S235 JRH – ST 37 |
|
20*20*2.00 MM |
7.48 KG |
S235 JRH – ST 37 |
|
20*20*2.50 MM |
9.50 KG |
S235 JRH – ST 37 |
|
25*25*1.50 MM |
7.02 KG |
S235 JRH – ST 37 |
|
25*25*2.00 MM |
9.36 KG |
S235 JRH – ST 37 |
|
25*25*2.50 MM |
11.80 KG |
S235 JRH – ST 37 |
|
25*25*3.00 MM |
12.41 KG |
S235 JRH – ST 37 |
|
30*30*1.50 MM |
8.42 KG |
S235 JRH – ST 37 |
|
30*30*2.00 MM |
10.56 KG |
S235 JRH – ST 37 |
|
30*30*2.50 MM |
14.04 KG |
S235 JRH – ST 37 |
|
30*30*3.00 MM |
16.84 KG |
S235 JRH – ST 37 |
|
40*40*1.50 MM |
11.23 KG |
S235 JRH – ST 37 |
|
40*40*2.00 MM |
14.96 KG |
S235 JRH – ST 37 |
|
40*40*2.50 MM |
18.72 KG |
S235 JRH – ST 37 |
|
40*40*3.00 MM |
22.46 KG |
S235 JRH – ST 37 |
|
40*40*4.00 MM |
29.95 KG |
S235 JRH – ST 37 |
|
40*40*5.00 MM |
27.07 KG |
S235 JRH – ST 37 |
|
50*50*1.50 MM |
14.04 KG |
S235 JRH – ST 37 |
|
50*50*2.00 MM |
18.72 KG |
S235 JRH – ST 37 |
|
50*50*2.50 MM |
23.40 KG |
S235 JRH – ST 37 |
|
50*50*3.00 MM |
28.08 KG |
S235 JRH – ST 37 |
|
50*50*4.00 MM |
37.44 KG |
S235 JRH – ST 37 |
|
50*50*5.00 MM |
46.80 KG |
S235 JRH – ST 37 |
|
60*60*1.50 MM |
16.84 KG |
S235 JRH – ST 37 |
|
60*60*2.00 MM |
22.46 KG |
S235 JRH – ST 37 |
|
60*60*2.50 MM |
28.08 KG |
S235 JRH – ST 37 |
|
60*60*3.00 MM |
33.69 KG |
S235 JRH – ST 37 |
|
60*60*4.00 MM |
44.92 KG |
S235 JRH – ST 37 |
|
60*60*5.00 MM |
56.16 KG |
S235 JRH – ST 37 |
|
70*70*1.50 MM |
19.65 KG |
S235 JRH – ST 37 |
|
70*70*2.00 MM |
26.20 KG |
S235 JRH – ST 37 |
|
70*70*2.50 MM |
32.76 KG |
S235 JRH – ST 37 |
|
70*70*3.00 MM |
39.31 KG |
S235 JRH – ST 37 |
|
70*70*4.00 MM |
52.41 KG |
S235 JRH – ST 37 |
|
70*70*5.00 MM |
65.52 KG |
S235 JRH – ST 37 |
|
80*80*2.00 MM |
29.95 KG |
S235 JRH – ST 37 |
|
80*80*2.50 MM |
37.44 KG |
S235 JRH – ST 37 |
|
80*80*3.00 MM |
44.92 KG |
S235 JRH – ST 37 |
|
80*80*4.00 MM |
59.90 KG |
S235 JRH – ST 37 |
|
80*80*5.00 MM |
74.88 KG |
S235 JRH – ST 37 |
|
80*80*6.00 MM |
83.46 KG |
S235 JRH – ST 37 |
|
90*90*2.00 MM |
33.69 KG |
S235 JRH – ST 37 |
|
90*90*2.50 MM |
42.12 KG |
S235 JRH – ST 37 |
|
90*90*3.00 MM |
50.54 KG |
S235 JRH – ST 37 |
|
90*90*4.00 MM |
67.39 KG |
S235 JRH – ST 37 |
|
90*90*5.00 MM |
84.24 KG |
S235 JRH – ST 37 |
|
90*90*6.00 MM |
94.73 KG |
S235 JRH – ST 37 |
|
100*100*2.00 MM |
37.44 KG |
S235 JRH – ST 37 |
|
100*100*2.50 MM |
46.80 KG |
S235 JRH – ST 37 |
|
100*100*3.00 MM |
56.16 KG |
S235 JRH – ST 37 |
|
100*100*4.00 MM |
74.88 KG |
S235 JRH – ST 37 |
|
100*100*5.00 MM |
93.60 KG |
S235 JRH – ST 37 |
|
100*100*6.00 MM |
106.01 KG |
S235 JRH – ST 37 |
|
100*100*8.00 MM |
138.04 KG |
S235 JRH – ST 37 |
|
110*110*3.00 MM |
60.34 KG |
S235 JRH – ST 37 |
|
110*110*4.00 MM |
79.70 KG |
S235 JRH – ST 37 |
|
110*110*5.00 MM |
98.68 KG |
S235 JRH – ST 37 |
|
110*110*6.00 MM |
117.29 KG |
S235 JRH – ST 37 |
|
110*110*8.00 MM |
153.38 KG |
S235 JRH – ST 37 |
|
120*120*3.00 MM |
67.39 KG |
S235 JRH – ST 37 |
|
120*120*4.00 MM |
89.95 KG |
S235 JRH – ST 37 |
|
120*120*5.00 MM |
112.32 KG |
S235 JRH – ST 37 |
|
120*120*6.00 MM |
128.57 KG |
S235 JRH – ST 37 |
|
120*120*8.00 MM |
168.42 KG |
S235 JRH – ST 37 |
|
140*140*4.00 MM |
102.25 KG |
S235 JRH – ST 37 |
|
140*140*5.00 MM |
126.88 KG |
S235 JRH – ST 37 |
|
140*140*6.00 MM |
151.12 KG |
S235 JRH – ST 37 |
|
140*140*8.00 MM |
198.49 KG |
S235 JRH – ST 37 |
|
150*150*3.00 MM |
84.24 KG |
S235 JRH – ST 37 |
|
150*150*4.00 MM |
112.32 KG |
S235 JRH – ST 37 |
|
150*150*5.00 MM |
140.40 KG |
S235 JRH – ST 37 |
|
150*150*6.00 MM |
162.40 KG |
S235 JRH – ST 37 |
|
150*150*8.00 MM |
213.53 KG |
S235 JRH – ST 37 |
|
200*200*4.00 MM |
147.36 KG |
S235 JRH – ST 37 |
|
200*200*5.00 MM |
183.26 KG |
S235 JRH – ST 37 |
|
200*200*6.00 MM |
218.79 KG |
S235 JRH – ST 37 |
|
200*200*8.00 MM |
288.71 KG |
S235 JRH – ST 37 |
|
200*200*10.00 MM |
357.13 KG |
S235 JRH – ST 37 |
|
250*250*5.00 MM |
234.00 KG |
S235 JRH – ST 37 |
|
250*250*6.00 MM |
275.18 KG |
S235 JRH – ST 37 |
|
250*250*8.00 MM |
363.90 KG |
S235 JRH – ST 37 |
|
250*250*10.00 MM |
451.11 KG |
S235 JRH – ST 37 |
1. 10×10, 12×12, 15×15, and 20×20 square tubes are suitable for light-duty structures, such as furniture, display racks, and billboards.
2. 25×25, 30×30, and 40×40 square tubes are suitable for light and medium-duty structures, such as doors and windows, stair railings, and fences.
3. 50×50, 60×60, 70×70, and 80×80 square tubes are suitable for medium and large-duty structures, such as building frames, large machinery supports, and viaducts.
4. 100×100 square tubes are suitable for large-duty structures, such as long-span buildings and highway bridges.
Heavy-duty structures (bridges, warehouses) → ≥ 6 mm wall thickness.
Light-duty furniture or decorations → 1-2 mm wall thickness.
Common lengths: 6m, 9m, 12m.
Custom cutting services are available upon request.
General types: Q235, S235.
High-strength applications: Q345, S355, or ASTM A500 C grade.
Outdoor projects → Galvanized or powder coated.
Indoor → Black steel or painted finish.
Select the appropriate grade for welding and forming.
Common side lengths range from 10×10 mm to 400×400 mm, with lengths typically 6m, 9m, or 12m.
The wall thickness of 12 gauge square tubes is approximately 2.77 mm (US 12 gauge steel pipe thickness standard).
Read more: Square tube VS. Rectangular tube or SHS steel meaning
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