Structural Steel Pipe: High-Strength Tubing for Construction & Engineering Projects.
ASTM A500/A53 Seamless & Welded Pipes (10.3–660mm OD) for Load-Bearing Structures.
Certified to ASTM A500 (cold-formed), EN 10219 (welded), and JIS G3444, these structural pipes support industrial buildings, bridges, and transmission towers with yield strengths up to 552 MPa. Available in SCH 10–XXS wall thicknesses and PSL1/PSL2 grades, they meet ISO 1461 for galvanized corrosion resistance.
Key Features:
- OD Range: 1/8″–26″ (10.3–660mm) with ±1% tolerance.
- Wall Thickness: SCH 10 (1.24mm) to XXS (50mm).
- Certifications: CE Marking, AWS D1.1, and AISC 360.
Technical Specifications
Dimensional Tolerances
| Process | OD Tolerance | WT Tolerance |
|---|---|---|
| Hot-Rolled | ±1% (min ±0.5mm) | +15%/-12.5% |
| Cold-Drawn | ±0.2–1% | ±0.15mm (WT ≤1mm) |
Mechanical Properties (ASTM A106 Grade B)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥485 MPa | ≥275 MPa | ≥30% | ≤174 HB |
Material Composition & Grades
Chemical Analysis (ASTM A53 Grade B)
- Carbon: ≤0.30%
- Manganese: ≤1.20%
- Phosphorus: ≤0.05%
- Sulfur: ≤0.06%
Common Grades:
- ASTM A500 Gr. C: 345 MPa yield for stadium frameworks.
- EN 10210 S355J2H: 355 MPa yield for seismic-resistant buildings.
- API 5L X70: 483 MPa yield for hybrid civil-oil infrastructure.
Manufacturing & Surface Protection
- Seamless Pipes: Mandrel piercing + cold drawing (ASTM A53).
- Welded Pipes: High-frequency induction welding (HFIW) for 6–24″ OD.
- Coatings:
- Hot-Dip Galvanized: 85µm zinc layer (ISO 1461).
- Epoxy Paint: RAL 3005 red oxide primer.
Applications & Competitive Advantages
- High-Rise Buildings:
- 508mm OD, 12mm WT A500 Gr. C: Supports 50-ton floor loads.
- Bridge Piling:
- 610mm OD, 20mm WT EN 10219: 120m span river crossings.
- Transmission Towers:
- 168mm OD, 8mm WT JIS G3444: Wind load resistance up to 150 mph.
Advantages vs. Competitors:
- Weldability: Pre-cut beveled ends reduce onsite labor by 40%.
- Custom Lengths: 5.8m/12m fixed or random lengths (DRL/SRL).
Quality Assurance & Testing
- NDT Protocols:
- Ultrasonic Testing: Detects laminations ≥5% WT (ASTM E213).
- Bend Testing: 180° cold bend without cracking (ASTM A370).
- Certifications:
- Mill Test Certificates (EN 10204 3.1).
- Third-party inspection by SGS/BV.
Packing And Delivery
