ERW Square Pipe is manufactured by forming steel strip into a square shape and welding the seam using high‑frequency resistance welding (HFW). It is widely used in:
Structural engineering
Construction frameworks
Mechanical fabrication
Furniture and automotive components
General engineering applications
ERW square tubes offer:
High dimensional accuracy
Smooth internal and external surfaces
Uniform wall thickness
Excellent weldability and formability
They are one of the most commonly used structural hollow sections worldwide.
🟦 Standards
ASTM A500 (Grade A/B/C)
EN 10219 (S235 / S275 / S355)
GB/T 6728 (Cold‑formed structural tubes)
BS 1387
ASTM A53 (for non‑critical applications)
🟦 Grades
Q195 / Q215 / Q235
Q345 (high strength)
S235 / S275 / S355
ASTM A500 Grade A/B/C
🟦 Product Specifications & Available Sizes
Outer Size (Side Length)
10×10 mm to 500×500 mm
Wall Thickness (WT)
0.8–20 mm
Length
6 m / 12 m / custom
End Types
Plain End
Beveled End
Surface Options
Black
Pre‑galvanized
Hot‑dip galvanized
Oiled
Varnish coated
Dimensions mm
Dimensions mm
20*20*1.0
80*80*3.5
25*25*1.8
80*80*7.75
25*25*2
100*100*11.75
25*25*2.5
100*100*2.75
25*25*2.75
100*100*3.75
250*250*9.5
100*100*4.75
30*30*0.7
100*100*7.75
30*30*1.5
120*120*2.75
30*30*1.8
120*120*4.75
30*30*2
150*150*11.75
30*30*2.5
150*150*3.75
30*30*2.75
150*150*5.75
40*40*1.5
180*180*8
40*40*2.5
200*200*4.75
50*50*2.5
200*200*7.5
50*50*2.5
200*200*7.75
50*50*3.0
300*300*11.75
50*50*3.5
300*300*12
50*50*3.5
300*300*9.75
60*60*2.5
400*400*11.5
60*60*3.0
400*400*11.75
80*80*2.5
500*500*11.75
The above are the general items, for the special types, we can also meet your needs.
🟦 Chemical Composition
(Example: Q235 / S235)
Q235
Element
Content (%)
C
≤ 0.22
Mn
≤ 1.40
Si
≤ 0.35
P
≤ 0.045
S
≤ 0.045
S235
Element
Content (%)
C
≤ 0.22
Mn
≤ 1.60
Si
≤ 0.55
P
≤ 0.040
S
≤ 0.040
🟦 Mechanical Properties
Q235
Property
Requirement
Tensile Strength
375–500 MPa
Yield Strength
≥ 235 MPa
Elongation
≥ 26%
S235
Property
Requirement
Tensile Strength
360–510 MPa
Yield Strength
≥ 235 MPa
Elongation
≥ 26%
🟦 Physical Properties
Property
Value
Density
7.85 g/cm³
Thermal Conductivity
45–60 W/m·K
Magnetic
Yes
🟦 Manufacturing Processes
High‑frequency ERW welding
Sizing & shaping
Straightening
Annealing (optional)
Galvanizing (optional)
Hydrostatic testing
Eddy current testing
🟦 Primary Industry Usage
Structural frameworks
Construction and building systems
Mechanical fabrication
Furniture manufacturing
Automotive components
General engineering applications
🟦 Why Use ERW Square Pipe
High dimensional accuracy
Excellent weldability and formability
Smooth surface for fabrication
Cost‑effective structural solution
Available in black and galvanized finishes
🟦 Why Choose Jaron Steel
Full size range of ERW square tubes
Black, pre‑galvanized, and hot‑dip galvanized options
MTC 3.1 + third‑party inspection
Export‑grade packaging & loading supervision
Competitive pricing for construction and engineering projects
🟦 Short Description
Type: ERW Square Pipe
Size Range: 10×10 mm to 500×500 mm, WT 0.8–20 mm
Surface: Black / Pre‑galvanized / Hot‑dip galvanized
Applications: Structural, mechanical, and fabrication uses
Key Feature: High dimensional accuracy & smooth surface
