ERW pipes means Electric Resistance Welded Pipes.
ERW steel pipes and tubes are used. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.
| Out Diameter | Tolerance of Pipe End | Tolerance of Pipe Body |
| 219.1-273.1 | +1.6mm, -0.4mm | ±0.75% |
| 274.0-320 | +2.4mm, -0.8mm | ±0.75% |
| 323.9-457 | +2.4mm, -0.8mm | ±0.75% |
| 508 | +2.4mm, -0.8mm | ±0.75% |
| 559-610 | +2.4mm, -0.8mm | ±0.75% |
| Grade | Out Diameter | Wall Thickness |
| / | 219.1-457 | +15%, -12.5% |
| B | 508-610 | +17.5%, -12.5% |
| X42-X80 | 508-610 | +19.5%, -8% |
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