Square Steel Pipe / Square Hollow Section (SHS)
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Structural Integrity
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Easy Fabrication
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Versatile Use
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Detailed Description of Square Steel Pipe (SHS)
Square Hollow Section (SHS) is a structural pipe manufactured by high frequency resistance welding (ERW) or thermoforming process. ERW process cold bends the steel strip into a round pipe and welds it, then presses the square through the calibrating roll, and heat treats it to eliminate the stress after welding, so the dimensional accuracy reaches ±0.5mm. thermoforming process heats the round pipe billet to 900-950°C and expands the square hydraulically, so it realizes the homogeneous structure without weld seams, and the uniformity of the wall thickness is more than 95%. The closed section provides excellent torsional resistance. High strength and light weight (HSLA steel strength ≥355MPa), right-angled edges are easy to weld around the whole circumference, which is the preferred solution for building frames, machinery trusses and other load-bearing structures.
Key Parameters for Square Steel Pipe
Parameter |
Details |
Manufacturing Process |
ERW (Cold Formed or Hot Formed), Seamless (less common for SHS) |
Standards |
ASTM A500 (Gr. A, B, C, D), EN10219 (S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H), EN10210 (S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355NH, S355NLH), JIS G3466 (STKR400, STKR490), AS/NZS 1163 (C250, C350, C450) |
Steel Grade |
Q195, Q235, Q345 (Chinese Standards); Gr. A, B, C, D (ASTM A500); S235, S275, S355 (EN Standards); STKR400, STKR490 (JIS) |
Size (Side x Side) |
15x15mm to 500x500mm (larger sizes may be available) |
Wall Thickness (WT) |
0.8mm to 25mm (varies with size and standard) |
Length |
Usually 6m or 12m; can be customized (e.g., 5.8m for container loading) |
Corner Radius |
Typically 2T to 3T (T = Wall Thickness), varies by standard |
Surface Treatment |
Black (bare/self-color), Oiled, Galvanized (Hot-dip or Pre-galvanized), Painted/Powder Coated |
Inspection |
Dimensional Check, Tensile Test, Yield Strength, Elongation, Weld Test (for ERW), Chemical Analysis |
Square Steel Pipe Specifications (Illustrative Common Sizes)
Square Steel Pipe | |||
OD |
WT |
OD |
WT |
(mm) |
(mm) |
(mm) |
(mm) |
20*20 |
1.0-2.0 |
100*100 |
1.5-13.0 |
25*25 |
1.0-3.0 |
120*120 |
2.5-15.0 |
30*30 |
1.2-3.0 |
130*130 |
2.5-15.0 |
35*35 |
1.2-3.75 |
140*140 |
2.5-15.0 |
40*40 |
1.2-5.0 |
150*150 |
2.5-15.0 |
45*45 |
1.2-6.0 |
160*160 |
2.5-15.0 |
50*50 |
1.2-6.0 |
180*180 |
2.5-15.0 |
55*55 |
1.3-6.0 |
200*200 |
3.0-15.0 |
60*60 |
1.3-6.0 |
220*220 |
3·5-12.75 |
70*70 |
1.3-6.0 |
250*250 |
4·5-12.75 |
75*75 |
1.5-6.0 |
300*300 |
4.0-12.75 |
80*80 |
1.5-6.0 |
350*350 |
6.0-12-75 |
90*90 |
2.0-6.0 |
400*400 |
6.0-12.75 |
Main Application Areas for Square Steel Pipe
With its excellent structural performance and elegant design, square hollow section has become an indispensable building material in modern engineering field. Its unique hollow structure not only realizes the perfect balance between light weight and high strength, but also shows excellent bending and torsion resistance, and thus is widely used in many industries:
Construction:
Used as the main load-bearing component in the structural framework of residential buildings, commercial complexes and industrial plants.
Widely used in columns, beams, truss systems and all kinds of supporting structures.
Infrastructure construction:
Main support structure of bridge project, skeleton system of footbridge, support frame of traffic sign, road safety guardrail system.
Industrial manufacturing field:
The main frame of all kinds of mechanical equipment, the base of automated production line equipment, the support structure of material transportation system
Furniture design and manufacturing:
Frame structure of modern office furniture, commercial display shelving systems, support components for creative furniture
Transportation Industry:
Key components of automobile chassis, anti-roll protection frames for racing cars, support structures for special vehicles
Agricultural production sector:
Frames for large agricultural machinery, modern greenhouse support systems
Safety protection system:
Industrial fence posts, building security fences, handrail systems for public areas
Customized Manufacturing:
Special-purpose structural components, customized engineering components, specialized equipment components
CORTEC STEEL LIMITED offer a wide range of products to meet the diverse needs of large-scale infrastructure to precision manufacturing, fully reflecting the design concept of “multi-purpose” of modern engineering materials.
Advantages of Square Steel Pipe:
As a modern engineering material, square steel pipe has the following significant advantages:
Excellent structural efficiency
High strength-to-weight ratio: provides higher load carrying capacity per unit weight, realizing efficient use of materials
Excellent torsional performance: the closed section characteristic makes its torsional rigidity significantly better than that of open section steel
Convenience of construction
Superior processing performance: supports a variety of processing processes, including cutting, welding, drilling, etc.
Various connection methods: can be bolted, welded, and other connection methods
Adaptation of design
Simple and beautiful appearance: even and regular cross-section, smooth lines, meet the aesthetic demand of modern architecture
Wide range of applications: suitable for building structures, machinery manufacturing, bridge engineering and other fields
Economic advantages
Comprehensive cost-effectiveness: under the same strength requirements, it can reduce the amount of materials and construction costs
Low maintenance costs: mature surface treatment process, good durability, and easy maintenance
These characteristics make square steel pipe become the preferred material in modern engineering construction, especially suitable for projects with high requirements on structural performance, construction efficiency and economic benefits.
