Q355B High Strength Structural Seamless Steel Pipe – General Construction Grade
Product Overview
Q355B low alloy high strength structural steel pipe is a standard load-bearing structural material designed for building and engineering applications. Manufactured by hot rolling low carbon micro-alloyed steel into seamless tubular form, it delivers significantly higher yield strength and better strength-to-weight ratio than standard mild carbon steel pipe. This general construction grade is the most widely specified high strength structural pipe, suitable for a broad range of building, infrastructure and mechanical structural applications.
Why Choose CNB High Strength Structural Pipe?
We source high strength structural pipes from leading Chinese structural steel mills with strict control over chemical composition and mechanical properties. Every pipe undergoes strict incoming inspection over yield strength, dimensional accuracy and surface defects, with full material traceability from melt to finished product. With large ready stock of standard sizes and custom processing capabilities, we can meet both bulk construction projects and specialized structural requirements efficiently.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | High Strength Structural Seamless Steel Pipe |
| Steel Grade | Q355B / S355JR / ASTM A500 Gr.B |
| Manufacturing Process | Hot rolled seamless |
| Outer Diameter Range | 57mm – 426mm |
| Wall Thickness Range | 3.5mm – 30mm |
| Standard Lengths | 6m / 12m, custom cut |
| Surface Condition | Black varnished, bare, shot blasted option |
| Applicable Standards | GB/T 8162, EN 10210, ASTM A500 |
| Minimum Yield Strength | ≥355MPa |
| Minimum Tensile Strength | 470–630MPa |
Core Advantages
- High strength-to-weight ratio: Reduces material weight and foundation load compared with mild steel.
- Seamless structural integrity: Uniform circumferential strength for consistent load-bearing performance.
- Excellent weldability: Compatible with all standard structural welding methods.
- Wide size range: Covers small support tubes to large-diameter heavy-wall columns.
- Proven construction performance: Widely adopted in building and infrastructure projects worldwide.
Applications
This Q355B high strength structural pipe is widely used for building structural columns, bridge supports, equipment frames, truss members, lifting machinery, transmission towers and general load-bearing structural components.
Get a Quotation
We supply high strength structural steel pipes in various grades, sizes and wall thicknesses with custom processing and fabrication options. Full material test certificates and third-party inspection are available upon request. Contact our structural steel team for a detailed project quotation.
