Q235B ASTM A36 S235JR SS400 Welded Steel Pipe , Structural / Pipeline Carbon Steel Tube
Q235B / ASTM A36 / S235JR / SS400 Welded Steel Pipe – Structural & Pipeline Carbon Steel Tube
Our welded steel pipes are available in multiple equivalent grades including Q235B, ASTM A36, S235JR, and SS400, offering flexible and cost-effective solutions for structural and pipeline applications worldwide. Manufactured using advanced ERW or spiral welding technology, these pipes deliver reliable strength, consistent quality, and excellent performance across diverse project requirements.
Key Features
- Multiple Grade Options
Available in Q235B (GB), ASTM A36 (US), S235JR (EU), and SS400 (Japan), allowing seamless substitution to meet regional specifications and project standards worldwide. - High-Strength Performance
With minimum yield strength of 235-250 MPa and tensile strength of 370-510 MPa, these pipes provide reliable structural integrity for demanding applications. - Excellent Weldability and Formability
Low-carbon composition ensures easy welding, bending, and fabrication, simplifying on-site installation and reducing labor costs. - Cost-Effective Solution
Welded construction offers competitive pricing compared to seamless alternatives, making these pipes an economical choice for large-scale infrastructure projects.
Available Grades and Equivalents
| Grade | Standard | Comparative Grade |
|---|---|---|
| Q235B | GB/T 700 | – |
| ASTM A36 | ASTM A36 | Q235B / SS400 / S235JR (approx.) |
| S235JR | EN 10025-2 | Q235B / SS400 / A36 (approx.) |
| SS400 | JIS G3101 | Q235B / A36 / S235JR (approx.) |
*Grade equivalents are provided for reference only. Please verify specifications for your specific application.*
Product Specifications
| Specification | Details |
|---|---|
| Material Grades | Q235B, ASTM A36, S235JR, SS400 |
| Pipe Type | ERW / Spiral Welded |
| Outer Diameter | 21.3mm – 3500mm |
| Wall Thickness | 1.0mm – 40mm |
| Length | 5.8m – 12.5m or customized |
| Standards | GB/T 3091, ASTM A53, EN 10219, JIS G3444 |
| Surface Treatment | Bare, oiled, galvanized, painted, or 3PE/FBE coated |
| Ends | Plain, beveled, or threaded |
Common Applications
- Building and bridge construction
- Water supply and drainage systems
- Oil and gas transmission (low to medium pressure)
- Heating and cooling pipelines
- Piling and foundation works
- Fencing, scaffolding, and greenhouse structures
- Industrial equipment manufacturing
Quality Assurance
Each pipe undergoes rigorous inspection including chemical composition analysis, mechanical property testing, dimensional checks, surface inspection, and hydrostatic or non-destructive testing to ensure weld integrity and pressure-bearing capacity.
Why Choose Us
- Competitive factory-direct pricing
- Multiple grade equivalents for international projects
- Custom sizes and surface treatments available
- Flexible order quantities – from trial to bulk orders
- Reliable delivery with professional logistics support
- Technical assistance from inquiry to installation
Our welded steel pipes deliver the strength, versatility, and value you need for your structural and pipeline projects. With four equivalent grades available, we make international sourcing simple and efficient. Contact us today to discuss your specific requirements.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.