Premium ERW & HFW Steel Pipe (Welded Pipe)
Our ERW (Electric Resistance Welded) and HFW (High-Frequency Welded) pipes are manufactured with exceptional dimensional accuracy, excellent surface appearance, and robust structural strength. Engineered for a wide range of applications including oil & gas transmission, low-pressure fluid transport, and structural engineering.
-
Size Range: Outside Diameter (O.D.) from 1/2″ to 24″ (21.3mm – 609.6mm) | Wall Thickness (W.T.) up to 15.09mm (Sch10 – Sch160, STD, XS).
-
Welding Technology: Electric Resistance Welding (ERW) & High-Frequency Welding (HFW) utilizing skin effect and proximity effect for flawless seams.
-
Key Standards: API 5L, API 5CT, ASTM A53, EN 10219, EN 10210, AS/NZS 1163, JIS G3444, EN 10217.
-
Grades Available: API 5L Gr.B to X80, ASTM A53 Gr.A/B, S235JRH to S460, J55/K55, C250/C350/C450.
-
Applications: Oil, gas, water transport, piling, scaffolding, and mechanical structures.
Description
1. Product Overview
ERW Pipe stands for Electric Resistance Welded pipe. It is characterized by excellent appearance, high dimensional accuracy, and exceptional structural strength, making it an ideal choice for both structural applications and fluid transmission.
HFW Pipe stands for High-Frequency Welded pipe. In the HFW manufacturing process, high-frequency current passes through a metal conductor and produces two peculiar effects: the skin effect and the proximity effect. These effects concentrate the high-frequency electric energy on the surface of the weldment. By utilizing this concentrated energy, the edge of the steel plate is heated rapidly to its melting point. It is then squeezed and pressed by extruder rollers to form a seamless, highly integrated weld.
2. Production Standards & Material Grades
Our ERW & HFW pipes comply with the most stringent international standards, ensuring reliable performance across diverse industries.
| Standard | Steel Grade |
|---|---|
| API 5L (PSL1 & PSL2) | Gr.B, X42, X46, X52, X56, X60, X65, X70, X80 |
| API 5CT | H40, J55, K55 |
| EN 10219 / EN 10210 | S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S420, S460 |
| ASTM A53 | Gr.A, Gr.B |
| EN 10217 | P195TR1, P235TR1, P265TR1 |
| AS/NZS 1163 | C250, C350, C450 |
| JIS G3444 | STK400, STK500 |
3. Dimension & Weight of ERW Pipe
Below is the detailed specification matrix for nominal pipe sizes, outer diameters, wall thicknesses, and weights.
| Nominal Pipe Size (NPS) | Outside Diameter (in) | Outside Diameter (mm) | Wall Thickness (in) | Wall Thickness (mm) | Weight (lb/ft) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 1/2″ | 0.840 | 21.3 | 0.109 | 2.77 (STD) | 0.85 | 1.27 |
| 0.147 | 3.73 (XS) | 1.09 | 1.62 | |||
| 3/4″ | 1.050 | 26.7 | 0.113 | 2.87 (STD) | 1.13 | 1.69 |
| 0.154 | 3.91 (XS) | 1.47 | 2.20 | |||
| 1″ | 1.315 | 33.4 | 0.133 | 3.38 (STD) | 1.68 | 2.50 |
| 0.179 | 4.55 (XS) | 2.17 | 3.24 | |||
| 1-1/4″ | 1.660 | 42.2 | 0.140 | 3.56 (STD) | 2.27 | 3.39 |
| 0.191 | 4.85 (XS) | 3.00 | 4.47 | |||
| 1-1/2″ | 1.900 | 48.3 | 0.145 | 3.68 (STD) | 2.72 | 4.05 |
| 0.200 | 5.08 (XS) | 3.63 | 5.41 | |||
| 2″ | 2.375 | 60.3 | 0.154 | 3.91 (STD) | 3.65 | 5.44 |
| 0.218 | 5.54 (XS) | 5.02 | 7.48 | |||
| 3″ | 3.500 | 88.9 | 0.216 | 5.49 (STD) | 7.58 | 11.29 |
| 0.300 | 7.62 (XS) | 10.25 | 15.27 | |||
| 4″ | 4.500 | 114.3 | 0.237 | 6.02 (STD) | 10.79 | 16.07 |
| 0.250 | 6.35 | 11.35 | 16.90 | |||
| 0.337 | 8.56 (XS) | 14.98 | 22.32 | |||
| 6″ | 6.625 | 168.3 | 0.250 | 6.35 | 17.02 | 25.36 |
| 0.280 | 7.11 (STD) | 18.97 | 28.26 | |||
| 0.432 | 10.97 (XS) | 28.57 | 42.56 | |||
| 8″ | 8.625 | 219.1 | 0.250 | 6.35 | 22.36 | 33.31 |
| 0.322 | 8.18 (STD) | 28.55 | 42.53 | |||
| 0.500 | 12.70 (XS) | 43.39 | 64.64 | |||
| 12″ | 12.750 | 323.8 | 0.250 | 6.35 | 33.38 | 49.71 |
| 0.375 | 9.53 (STD) | 49.56 | 73.86 | |||
| 0.500 | 12.70 (XS) | 65.42 | 97.46 | |||
| 16″ | 16.000 | 406.4 | 0.250 | 6.35 | 42.05 | 62.64 |
| 0.375 | 9.53 (STD) | 62.58 | 93.27 | |||
| 0.500 | 12.70 (XS) | 82.77 | 123.30 | |||
| 20″ | 20.000 | 508.0 | 0.250 | 6.35 | 52.73 | 78.55 |
| 0.375 | 9.53 (STD) | 78.60 | 117.15 | |||
| 0.500 | 12.70 (XS) | 104.13 | 155.15 | |||
| 24″ | 24.000 | 609.6 | 0.375 | 9.53 (STD) | 94.62 | 141.03 |
| 0.500 | 12.70 (XS) | 125.49 | 187.06 |
Note: The table above represents standard dimensions. We can supply wall thicknesses up to 15.09 mm and varying schedules upon request.
4. Manufacturing Process Flow
Our ERW and HFW pipes undergo a rigorous, multi-stage production and quality control process to guarantee zero defects and structural integrity. The continuous process involves:
Raw Material Uncoiling → Ultrasonic Testing (UT) → Leveling → Edge Milling → Forming → HFW Welding → Removing outside & inside bead → Ultrasonic Testing (UT) of Weld Seam → Intermediate frequency annealing → Air cooling → Water cooling → Sizing → Flying saw cutting → Hydrostatic testing → UT/MPI Inspection → Pipe end facing → Visual and dimension inspection → Weight and measuring → Marking → Coating → Packing.
5. Coating & Packaging
To ensure maximum longevity and prevent corrosion during storage and ocean transit, our pipes feature various protective treatments and packing methods:
- Surface Coating: Bare, lightly oiled, black painting, red/yellow anti-corrosion varnish, or 3LPE/FBE coating as required.
- End Finish: Plain ends (square cut) or Beveled ends, equipped with plastic caps or steel protectors.
- Packing: Small diameters are bundled with strong steel strips. Larger diameters are shipped loose, with lifting slings and proper dunnage to prevent mechanical damage.
