Q235B Welded Steel Pipe Features
With advancements in high-quality strip rolling production and improvements in welding and inspection technology, the quality of welded steel pipes has steadily increased.
Welded steel pipes are now available in a wider variety of specifications and have replaced seamless steel pipes in many fields due to their efficiency and cost-effectiveness.
Products Specifications
Outer Diameter (OD) & Wall Thickness (WT)
| Nominal Size | OD (mm) | WT (mm) |
|---|---|---|
| 1/2" (4分) | 21.25 | 2.75 |
| 3/4" (6分) | 26.75 | 2.75 |
| 1" | 33.3 | 3.25 |
| 1.25" (1.2") | 42.25 | 3.25 |
| 1.5" | 48 | 3.5 |
| 2" | 60 | 3.5 |
| 2.5" | 75.5 | 3.75 |
| 3" | 88.5 | 4 |
| 4" | 114 | 4 |
| 5" | 140 | 4.5 |
| 6" | 165 | 4.5 |
| 8" | 219 | 6 |
National Standard Water Pressure Values (example for reference, in MPa)
| OD (mm) | WT 6mm | WT 7mm | WT 8mm | WT 9mm | WT 10mm | WT 12mm |
|---|---|---|---|---|---|---|
| 219 | 9.7 | 11.3 | 12.9 | 8.6 | 5.7 | - |
| 273 | 7.7 | 9 | 10.3 | - | - | 6 |
| 325 | 6.5 | 7.6 | 8.7 | - | - | - |
| 377 | 5.7 | 6.7 | 7.6 | 8.6 | - | - |
(Additional specifications available upon request)
Chemical Composition
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| Q235B | 0–0.06 | 0.25 | 0.12 | 0.014 | 0.015 | - | - | - | - |
| 304L | 0–0.03 | 2 | 1 | 0.045 | 0.03 | 18 | - | 9 | - |
| 304H | 0.04–0.1 | - | - | 0.045 | - | 18 | - | 8 | - |
Processing Technology
The blank material for welding pipes can be steel plates or strip steel.
Welding types include furnace welding, electric resistance welding, and automatic submerged arc welding.
Welded pipes are categorized as:
Straight seam welded pipes
Spiral welded pipes
Pipe shapes can be:
Round
Shaped (square, rectangular, flat, etc.)
Pipes are further classified based on material and application.
Products Applications
Q235B welded steel pipes are widely used in:
Construction: Scaffolding, structural frameworks, building pipelines
Industrial machinery: Hydraulic cylinders, pneumatic cylinders, transport machinery
Energy & Chemical sectors: Oil, gas, and chemical pipelines
Agriculture & Irrigation: Greenhouse frames, water supply systems
Automotive & Engineering: Shafts, automotive frames, and welded structural components
