Welded Square Pipe

Welded Square Pipe

Welded Square Pipe / ERW Square Hollow Section is manufactured by high-frequency electric resistance welding with quality carbon steel strip. Strictly produced under ASTM A500, ASTM A53, EN10219, GB/T6728 standards. Features precise dimension, uniform wall thickness, flat weld seam, good toughness and strong load-bearing capacity. Available in black & hot dip galvanized finish. Widely used for building structure, framework, guardrail, machinery support, shelf and engineering construction.

◉ Product Details


1. Product Brief 

Welded Square Pipe / ERW Square Hollow Section is manufactured by high-frequency electric resistance welding with quality carbon steel strip. Strictly produced under ASTM A500, ASTM A53, EN10219, GB/T6728 standards. Features precise dimension, uniform wall thickness, flat weld seam, good toughness and strong load-bearing capacity. Available in black & hot dip galvanized finish. Widely used for building structure, framework, guardrail, machinery support, shelf and engineering construction.
Key Quality Control: Wall thickness tolerance ≤0.25mm, straightness, squareness, length tolerance and welding quality 100% inspected, fully compliant with international standard requirements.
Size Range: 10×10mm – 500×500mm
Wall Thickness: 1.2mm – 20mm
Standard Length: 6m / 9m / 12m or custom cut
Surface: Black welded, Hot Dip Galvanized (HDG)
Advantages: High welding stability, no crack/no burr, high straightness, easy cutting & bending, excellent structural performance

3. Standard Square Pipe Size & Weight Table (Common Sizes)

Unit: mm / Kg/m
Square SizeWall ThicknessWeight(Kg/m)Square SizeWall ThicknessWeight(Kg/m)
20×201.50.8560×602.03.65
20×202.01.1060×602.54.50
25×251.51.0860×603.05.30
25×252.01.4080×802.04.90
30×301.51.3280×802.56.10
30×302.01.7080×803.07.25
40×401.51.80100×1002.57.70
40×402.02.35100×1003.09.20
40×402.52.85100×1004.012.00
50×502.02.95120×1203.011.10
50×502.53.65150×1503.014.00
50×503.04.30150×1504.018.40

4. Production & Testing Standard

Executing Standard: ASTM A500, ASTM A53, EN 10217, EN 10219, GB/T 6728, GB/T 3091
Testing Items: Welding non-destructive test, dimension tolerance check, wall thickness deviation, straightness, tensile & bending test, surface inspection
Custom Service: Special size, special length, galvanized treatment, customized packaging are acceptable

5. Application

Steel structure building, factory frame, construction support, guardrail & fence, machinery equipment base, warehouse shelf, container parts, municipal engineering, scaffolding and other industrial structural projects.



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