Q235B is a Chinese carbon structural steel grade known for its excellent weldability and plasticity. For overseas projects, it is essential to know that Q235B is functionally equivalent to:
Europe: EN10025 S235JR
USA: ASTM A36 / ASTM A283 Grade C
International: ISO E235B
| Feature | Detailed Specification |
| Outer Diameter (OD) | 219.1mm – 3020mm (8″ to 120″) |
| Wall Thickness (WT) | 5.0mm – 25.4mm |
| Manufacturing Standards | API 5L, ASTM A252, EN10219, GB/T 9711 |
| Pipe Length | 6m, 12m, or customized up to 35m for piling |
| Surface Treatment | Bare, Black Painting, 3PE, FBE, or Liquid Epoxy |
| End Finish | Beveled ends (30°/35°) for on-site welding or square cut |
100% X-Ray Testing: Every inch of the spiral weld is inspected for internal flaws.
Hydrostatic Testing: Each pipe is tested under pressure to ensure zero leakage in water or oil transmission.
Online Ultrasonic Testing (UT): Real-time monitoring of weld integrity during the production process.
Dimensional Accuracy: We strictly control Out-of-Roundness and pipe end tolerances to ensure perfect fit-up at your construction site.
Nesting (Pipe-in-Pipe): We load smaller diameter pipes inside larger ones, maximizing container or vessel space.
Offshore Protection: Every pipe is fitted with heavy-duty end protectors and coated with anti-rust oil or varnish to survive long sea transits.
Expert Loading: Whether it’s Break Bulk or 40HC Containers, our team provides a detailed loading plan before the ship leaves the port.
