The 380mm diameter Q235 / Q355 welded steel pipe is widely used in construction, steel structures, piling, building frames, and mechanical applications.
Manufactured through high-frequency welded (ERW) or submerged arc welded (SAW/SSAW/LSAW) processes, this pipe offers excellent strength, stability, and durability for medium-to-large structural projects.
Product Features
Large Diameter: 380mm OD, suitable for heavy-duty structural support.
Material Options:
Q235: Good plasticity and weldability, ideal for general structural use.
Q355: High strength, low-alloy structural steel with higher yield strength.
High Weld Quality: Smooth internal and external welds, suitable for load-bearing applications.
Customizable Length: 6m, 12m, or tailored lengths.
Surface Treatment: Black, varnished, galvanization, anti-rust coating, or customized finishing.
Specifications
| Item | Description |
|---|---|
| Product Name | 380mm Diameter Q235 / Q355 Welded Steel Pipe |
| Outer Diameter | 380 mm |
| Wall Thickness | 4–25 mm (customizable) |
| Length | 6m / 12m / customized |
| Steel Grade | Q235, Q355 (B/C/D levels available) |
| Standard | GB/T 3091, GB/T 9711, API 5L, EN10219 (upon request) |
| Production Method | ERW / SSAW / LSAW |
| Technique | Hot rolled coil + welded |
| Surface | Black, varnish, galvanized, 3PE/3PP/FBE |
| Inspection | Hydro test, X-ray test, UT, size tolerance test |
| Application | Building materials, support columns, steel structures, piling, machinery |
Mechanical Properties (Reference)
Q235
Yield Strength: ≥235 MPa
Tensile Strength: 375–500 MPa
Q355
Yield Strength: ≥355 MPa
Tensile Strength: 470–630 MPa
Payment Terms
We offer flexible international payment terms:
✔ T/T (Telegraphic Transfer)
30% deposit in advance
70% balance before shipment
Optional: balance against copy of B/L (Bill of Lading)
✔ L/C (Letter of Credit)
Irrevocable L/C at sight
Other L/C terms (usance L/C, deferred payment) are negotiable depending on order quantity.
Advantages of Choosing Our Q235/Q355 Welded Steel Pipes
Strong production capacity and stable supply
Certified quality (ISO, SGS, BV)
Custom welding, cutting, beveling, and fabrication services
Fast delivery: 7–15 days
OEM/ODM available
