ERW steel pipes are manufactured by low-frequency or high-frequency resistance “resistance”. They are round pipes welded from steel plates with longitudinal welds. There are a lot of pipes could be manufactured by ERW process. Here below we list for the most common standards in pipelines.
| Standard | for erw pipe | ASTM A53 B, ASTM A178, ASTM A252 GR.2 API 5L X42/46/52/56/60/70 ASTM A500, ASTM A513 EN 10204/10217 S235JR,S275JR,S355,S355JR,S355J2H |
| for efw pipe | carbon steel efw pipe: ASTM A671,ASTM A672 alloy steel efw pipe: ASTM A691 | |
| Sizes | Out diameter | 1/2″ -24″ (21.3mm-610mm) |
| Wall Thickness | 1.65mm-20mm |
Application of ERW steel pipe
For ERW Line Pipe
For ERW Casing
For ERW Structure Tube
For High pressure and high temperature
Manufacturing Process of ERW steel pipe
- Electric Resistance Welded (ERW) pipe is manufactured by cold forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam. The two edges are then simultaneously heated with a high frequency current and squeezed together to form a bond. The longitudinal ERW seam does not require filler metal.
Out diameter Wall Thickness
1/2″ -24″ 1.65-20mm
Small diameter
| Out diameter | Sch 5 | Sch 10 | Sch 40 | ||||
| Inch | mm | Thickness | Kg/mtr | Thickness | Kg/mtr | Thickness | Kg/mtr |
| 1/2″ | 21.3 | 1.65 | 0.81 | 2.11 | 1.01 | 2.77 | 1.29 |
| 3/4″ | 26.7 | 1.65 | 1.03 | 2.11 | 1.30 | 2.87 | 1.71 |
| 1″ | 33.4 | 1.65 | 1.31 | 2.77 | 2.12 | 3.38 | 2.54 |
| 1 1/4″ | 42.2 | 1.65 | 1.93 | 2.77 | 3.15 | 3.68 | 4.11 |
| 1 1/2″ | 48.3 | 1.65 | 1.93 | 2.77 | 3.15 | 3.68 | 4.11 |
| 2″ | 60.3 | 1.65 | 2.42 | 2.77 | 3.98 | 4.81 | 5.31 |
| 3″ | 88.9 | 2.11 | 4.58 | 3.05 | 6.54 | 5.49 | 11.45 |
| 3 1/2″ | 101.6 | 2.11 | 5.25 | 3.05 | 7.52 | 5.74 | 13.77 |
| 4″ | 114.3 | 2.11 | 5.25 | 3.05 | 7.52 | 5.74 | 13.77 |
| 5″ | 141.3 | 2.77 | 9.50 | 3.40 | 11.74 | 6.55 | 22.10 |
| 6″ | 168.3 | 2.77 | 11.47 | 3.40 | 14.04 | 7.11 | 28.68 |
| 8″ | 219.1 | 2.77 | 14.99 | 3.76 | 20.25 | 8.18 | 43.16 |
Large diameter
| OD | WT | ||||||||||||||||||
| Inch | mm | 8 5/8″ | 219.1mm | 10 3/4″ | 273.1 mm | 12 3/4″ | 325.0 mm | 14″ | 355.6 mm | 16″ | 406.4 mm | 18″ | 457.7 mm | 20″ | 508.0 mm | 24″ | 610 mm | 24 4/5″ | 630.0 mm |
| 0.157 | 4.0 | —- | — | ||||||||||||||||
| 0.197 | 5.0 | — | — | — | — | — | — | — | — | ||||||||||
| 0.236 | 6.0 | — | — | — | — | — | — | — | — | — | — | — | — | ||||||
| 0.276 | 7.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||
| 0.315 | 8.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||
| 0.354 | 9.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||
| 0.394 | 10.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 0.133 | 11.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 0.492 | 12.5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 0.551 | 14.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||
| 0.630 | 16.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||
| 0.689 | 17.5 | — | — | — | — | — | — | — | — | — | — | ||||||||
| 0.748 | 19.0 | — | — | — | — | — | — | — | — | ||||||||||
| 0.787 | 20.0 | — | — | — | — | — | — | ||||||||||||
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