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ERW steel pipes means Electric Resistance Welded Pipes.
Standards of erw steel pipe| ERW Pipe | ||
| ASTM | ASTM A53 B, ASTM A178, ASTM A252 GR.2, A500, ASTM A513 | |
| API | API 5L X42/46/52/56/60/70 | |
| EN | EN 10204/10217 S235JR,S275JR,S355,S355JR,S355J2H | |
| EFW Pipe | ||
| Carbon steel | ASTM A671,ASTM A672 | |
| Alloy steel | ASTM A691 | |
Sizes of erw steel pipe
Out diameter: 1/2" -24" (21.3mm-610mm)
Wall thickness: 1.65mm-20mm
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.
Details of production
Recieving and offloading of coil Coil feed ramp
Coil to coil end welding Strip accumulator
Rough edge conditionting of coil Fine edge conditioning of strip before welder
Breakdown and fin cold rolling stands High frequency erw welder
Annealing of weld seam for superior strength Final shape pass
In-line traveling saw Hydrostatic pressure testing and straightening
Full weld integrity inspection Beveling,cut-off and shipping
- 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 | --- | --- | --- | --- | --- | --- | ||||||||||||
