ERW steel 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.
Tolerance of outside diameter
| Standard | Out Diameter | Tolerance of Pipe End | Tolerance of Pipe Body |
| API 5L | 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% |
Tolerance of wall thickness
| Standard | Grade | Out Diameter | Wall Thickness |
| API 5L | / | 219.1-457 | +15%, -12.5% |
| B | 508-610 | +17.5%, -12.5% | |
| X42-X80 | 508-610 | +19.5%, -8% |
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