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ERW steel pipes means Electric Resistance Welded Pipes.
Standards of erw steel pipeERW 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
![Receiving and unloading of coils for ERW pipes Receiving and unloading of coils for ERW pipes](/Upload/165363486653.jpg)
![Coil feed ramp for ERW pipe Coil feed ramp for ERW pipe](/Upload/165363490611.jpg)
Coil to coil end welding Strip accumulator
![](/Upload/165363493339.jpg)
![Strip accumulator of ERW pipe Strip accumulator of ERW pipe](/Upload/165363496086.jpg)
Rough edge conditionting of coil Fine edge conditioning of strip before welder
![](/Upload/165363498111.jpg)
![](/Upload/165363500823.jpg)
Breakdown and fin cold rolling stands High frequency erw welder
![](/Upload/165363503013.jpg)
![](/Upload/165363506259.jpg)
Annealing of weld seam for superior strength Final shape pass
![Annealing of weld seam for superior strength Annealing of weld seam for superior strength](/Upload/165363508274.jpg)
![Final shape pass Final shape pass](/Upload/165363510665.jpg)
In-line traveling saw Hydrostatic pressure testing and straightening
![In-line traveling saw In-line traveling saw](/Upload/165363513028.jpg)
![](/Upload/165363516277.jpg)
Full weld integrity inspection Beveling,cut-off and shipping
![Full weld integrity inspection of ERW pipe Full weld integrity inspection of ERW pipe](/Upload/165363518687.jpg)
![Beveling,cut-off and shipping of ERW pipe Beveling,cut-off and shipping of ERW pipe](/Upload/165363521437.jpg)
- 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 | --- | --- | --- | --- | --- | --- |
![ERW pipe ERW pipe](/Upload/163894681550.jpg)
![ERW steel pipe ERW steel pipe](/Upload/163894683590.jpg)
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