QIDAMT · CARBON STEEL PIPE
Q235B Carbon Steel Welded Pipe – ERW Round Tube
ERW welded Q235B round pipe for structural, fencing, scaffolding and general conveyance applications.
Q235B carbon steel welded pipe is an electric-resistance-welded (ERW) round tube made from Q235B mild steel coil. It is the most cost-effective round pipe for structural and low-pressure conveyance applications.
Key Advantages
Cost Effective
Much cheaper than seamless pipe.
Wide Diameters
21.3 – 610 mm OD available.
Weldable
Easy field welding and threading.
Consistent
Straight, round and dimensionally stable.
Chemical Composition (Q235B)
| Element | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| Content % | ≤ 0.20 | ≤ 0.35 | 0.30 – 0.70 | ≤ 0.045 | ≤ 0.045 |
Mechanical Properties
- Tensile strength (σb): ≥ 375 MPa
- Yield strength (σs): ≥ 235 MPa
- Elongation (δ): ≥ 20 %
- Hydrostatic test: 2.5 MPa (normal structural)
Standard Sizes
| Parameter | Range |
|---|---|
| Outer diameter | 21.3 – 610 mm (1/2″ – 24″) |
| Wall thickness | 1.8 – 16 mm |
| Length | 5.8 – 12 m (cut to length) |
| Surface | Black / painted / galvanized |
| Standard | GB/T 3091 / ASTM A53 / JIS G3444 |
Applications
Q235B welded pipe is used for structural tubing, fence posts, scaffolding, greenhouses, drainage, low-pressure water conveyance and machinery frames. For seamless pipe see our 20# seamless pipe; for galvanized pipe see galvanized round pipe.
Processing & Packaging
Cutting, threading, chamfering, beveling and coating available. Pipes are strapped in bundles with end caps.
Request a Q235B welded pipe quote
Send OD, wall, length and quantity — we confirm price within 24 hours.
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