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ERW steel pipe (Electric Resistance Welded Steel Pipe) is a common type of welded steel pipe made by heating the edges of steel strips with high-frequency electric current and then applying pressure to weld them. This process requires no additional welding materials, resulting in uniform, smooth welds and high production efficiency.
ERW welded pipe is another name for ERW steel pipe, emphasizing its "welded" nature. In industry applications and international trade, "ERW steel pipe" and "ERW welded pipe" generally refer to the same product, particularly in the field of carbon steel welded pipe The terms differ in how they are described.
High Dimensional Accuracy: Outer diameter and wall thickness are precisely controlled and meet multiple international standards.
Reliable Weld Quality: Heat-treated welds achieve mechanical properties close to those of the parent material.
High Production Efficiency: Continuous production is possible, making it suitable for large-scale supply.
Wide Applications: Applications include fluid transportation, structural components, machinery manufacturing, and municipal engineering.
Uncoiling --- 2. Leveling --- 3. End cutting --- 4. End shearing welding --- 5. Supercoil accumulator --- 6. Edge cutting --- 7. Ultrasonic detection --- 8. Forming --- 9. Electric induction welding --- 10. Ultrasonic detection for weld seam --- 11. Medium frequency heat treatment --- 12. Air cooling --- 13. Water cooling --- 14. Sizing --- 15. Flying cutting --- 16. Flush-out --- 17. Cropping --- 18. Flattening testing --- 19. Straightening --- 20. End facing and bevelling --- 21. Hydrodynamic testing --- 22. Ultrasonic detection for weld seam --- 23. Ultrasonic detection for pipe end --- 24. Visual and dimensions inspection --- 25.Weighting and measuring --- 26. Marking --- 27. Coating --- 28. Pipe-end protection --- 29. Bending --- 30. Shipping
| Nominal Outer Diameter (inches) | Nominal Outer Diameter (mm) | Common Wall-Thickness Range (mm) | Regular Length (m) | Typical Applications |
|---|---|---|---|---|
| 1/2″ | 21.3 | 1.5 – 3.0 | 5.8 / 6 / 12 | Home plumbing, furniture, light structures |
| 3/4″ | 26.9 | 1.5 – 3.2 | 5.8 / 6 / 12 | Water supply & drainage, small structures |
| 1″ | 33.7 | 2.0 – 3.5 | 5.8 / 6 / 12 | Scaffolding, mechanical tubing |
| 1-1/4″ | 42.4 | 2.0 – 4.0 | 5.8 / 6 / 12 | Construction, HVAC systems |
| 1-1/2″ | 48.3 | 2.5 – 4.5 | 5.8 / 6 / 12 | Scaffolding, support pipes |
| 2″ | 60.3 | 2.5 – 5.0 | 5.8 / 6 / 12 | Structural parts, conveyance piping |
| 2-1/2″ | 76.1 | 2.5 – 6.0 | 5.8 / 6 / 12 | Engineering structures, machinery building |
| 3″ | 88.9 | 3.0 – 6.5 | 5.8 / 6 / 12 | Building, municipal pipelines |
| 3-1/2″ | 101.6 | 3.0 – 8.0 | 5.8 / 6 / 12 | Municipal works, industrial piping |
| 4″ | 114.3 | 3.0 – 8.0 | 5.8 / 6 / 12 | Water & gas supply lines |
| 5″ | 141.3 | 3.5 – 10.0 | 5.8 / 6 / 12 | Engineering, oil & gas |
| 6″ | 168.3 | 4.0 – 12.0 | 5.8 / 6 / 12 | Oil & gas, structural steel pipe |
| 8″ | 219.1 | 4.0 – 12.0 | 5.8 / 6 / 12 | Transmission pipelines, municipal works |
| 10″ | 273.1 | 5.0 – 14.0 | 5.8 / 6 / 12 | Oil & gas transmission, large-diameter pipe |
| 12″ | 323.9 | 6.0 – 16.0 | 5.8 / 6 / 12 | Engineering, petrochemicals, structural support |
| 14″ | 355.6 | 6.0 – 18.0 | 5.8 / 6 / 12 | Long-distance pipelines, industrial projects |
| 16″ | 406.4 | 6.0 – 20.0 | 5.8 / 6 / 12 | Oil transmission, structural pieces |
| 18″ | 457.0 | 6.0 – 20.0 | 5.8 / 6 / 12 | Large-scale municipal, oil & gas |
| 20″ | 508.0 | 8.0 – 20.0 | 5.8 / 6 / 12 | Cross-regional transmission pipelines |
| 24″ | 610.0 | 8.0 – 20.0 | 5.8 / 6 / 12 | Large-diameter projects, energy pipelines |
| Item | ERW Steel Pipe (Electric-Resistance-Welded) | Seamless Steel Pipe | SSAW Steel Pipe (Spiral Submerged-Arc Welded) |
|---|---|---|---|
| Production Process | Steel strip formed by high-frequency resistance welding without filler metal. | Hot piercing & rolling from solid billet; no weld seam. | Steel strip helically formed and welded on both OD & ID. |
| Weld Seam | Straight, uniform seam; properties close to base metal. | No weld seam; full-body strength. | Long spiral seam; large weld volume; strength slightly lower than straight-seam pipe. |
| Size Range | OD 21.3–610 mm, WT 1.5–20 mm | OD 6–720 mm, WT 1–120 mm | OD 219–3 620 mm, WT 6–25 mm |
| Dimensional Accuracy | High accuracy, smooth appearance. | High accuracy, best mechanical properties. | Lower accuracy; ovality & straightness tolerances larger. |
| Pressure Capacity | Medium; suitable for medium-/low-pressure service & structural use. | High; for high-pressure & high-temperature service. | Medium-/low-pressure; widely used for long-distance pipelines. |
| Cost | Moderate; high cost-performance ratio. | Highest cost. | Lowest cost; most economical. |
| Production Efficiency | High; continuous mass production. | Low; limited output. | High; ideal for large-diameter, long-length pipe. |
| Typical Applications | Municipal water & drainage, structural members, medium-/low-pressure oil & gas lines. | Petro-chemical, high-pressure boilers, defense, machinery building. | Cross-regional long-distance oil & gas pipelines, large-diameter municipal projects. |
| Representative Standards | GB/T 3091, ASTM A53, EN 10217 | GB/T 8162, ASTM A106, API 5L | GB/T 9711, API 5L, SY/T 5037 |
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