erw welded steel seam pipe efw pipe for gas
During ERW pipe welding, heat is generated when current flows through the contact surface of the welding area. It heats the two edges of the steel to the point where one edge can form a bond. At the same time, under the action of the combined pressure, the edges of the tube blank melt and squeeze together.
Usually ERW pipe maximum OD is 24” (609mm), for larger dimensions pipe will be manufactured in SAW.
What kind of pipes (standards) could be made in ERW processes？
There are a lot of pipes could be manufactured by ERW process:
Carbon steel pipe in ERW
ASTM A53 Grade A and B (and Galvanized)
ASTM A252 pile pipe
ASTM A500 structural tubing
ASTM A134 and ASTM A135 pipe
EN 10219 S275, S355 pipe
Stainless steel ERW pipe/Pipe standards and specifications
ASTM A269 stainless pipe
ASTM A270 sanitary tubing
ASTM A312 Stainless pipe
ASTM A790 ferritic/austenitic/duplex stainless pipe
API ERW Line pipe
API 5L B to X70 PSL1 (PSL2 shall be in HFW process)
API 5CT J55/K55, N80 casing and tubing etc.
Technical parameters of erw pipe
ERW Steel Pipe, ERW Casing, ERW Carbon Steel Pipe, MS ERW Pipe, GI ERW Pipe, Stainless ERW Pipe
Sizes:
OD (Out Diameter): 21.3-660mm
WT (Wall Thickness): 1.0-20mm or sch5, sch10, sch40, sch80, st, xs
Standard:
for erw pipe
ASTM A53 B, A106, ASTM A178, ASTM A252
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
Coating:
| 3PE Coating | 3PP Coating | FBE Coating | Epoxy Coating | Special Painting |
Uses:
For ERW Line Pipe
For ERW Casing
For ERW Structure Tube
For High pressure and high temperature
Chemical Analysis and Mechanical Properties
| Standard | Class | Grade | Chemical Analysis(%) | Mechanical Properties(min)(Mpa) | ||||
| C | Mn | P | S | Tensile Strength | Yield Strength | |||
| API 5L | PSL1 | B | 0.26 | 1.2 | 0.03 | 0.03 | 414 | 241 |
| X42 | 0.26 | 1.3 | 0.03 | 0.03 | 414 | 290 | ||
| X46 | 0.26 | 1.4 | 0.03 | 0.03 | 434 | 317 | ||
| X52 | 0.26 | 1.4 | 0.03 | 0.03 | 455 | 359 | ||
| X56 | 0.26 | 1.4 | 0.03 | 0.03 | 490 | 386 | ||
| X60 | 0.26 | 1.4 | 0.03 | 0.03 | 517 | 414 | ||
| X65 | 0.26 | 1.45 | 0.03 | 0.03 | 531 | 448 | ||
| X70 | 0.26 | 1.65 | 0.03 | 0.03 | 565 | 483 | ||
| PSL2 | B | 0.22 | 1.2 | 0.025 | 0.015 | 414 | 241 | |
| X42 | 0.22 | 1.3 | 0.025 | 0.015 | 414 | 290 | ||
| X46 | 0.22 | 1.4 | 0.025 | 0.015 | 434 | 317 | ||
| X52 | 0.22 | 1.4 | 0.025 | 0.015 | 455 | 359 | ||
| X56 | 0.22 | 1.4 | 0.025 | 0.015 | 490 | 386 | ||
| X60 | 0.22 | 1.4 | 0.025 | 0.015 | 517 | 414 | ||
| X65 | 0.22 | 1.45 | 0.025 | 0.015 | 531 | 448 | ||
| X70 | 0.22 | 1.65 | 0.025 | 0.015 | 565 | 483 | ||
| X80 | 0.22 | 1.85 | 0.025 | 0.015 | 621 | 552 | ||
High-frequency straight seam electric-resistance welded steel pipe(erw steel pipe) is hot-rolled coil after forming machine, the use of high-frequency current skin effect and proximity effects, the tube edge heating and melting, squeeze roller under pressure welding to achieve production.
High-frequency resistance welding steel pipe, welding pipe and ordinary welding process is not the same, the weld is made of the base metal melt from the body, the mechanical strength is better than the general pipe. Smooth appearance, high precision, low cost weld high and small, favorable 3PE anti-corrosion coating. There are significant differences in the welding methods between high frequency welded pipe and submerged arc welded pipe. As the welding is done instantly at high speed, the difficulty of ensuring the quality of welding is much higher than that of submerged arc welding.
Steel pipe strength factory certification
ERW Casing
Standard: API SPEC 5CT
Application: Casing serves as wall of well
| OD | WT | End Type | |||||
| inch | mm | inch | mm | Grade | |||
| J55 | M65 | N80/L80-1 | P110 | ||||
| K55 | |||||||
| 8 5/8 | 219.08 | 0.304 | 7.72 | - | PS | - | - |
| 0.352 | 8.94 | PSLB | PSLB | - | - | ||
| 0.4 | 10.16 | PSLB | PSLB | PLB | PLB | ||
| 0.45 | 11.43 | - | PLB | PLB | PLB | ||
| 0.5 | 12.7 | - | - | PLB | PLB | ||
| 9 5/8 | 244.48 | 0.352 | 8.94 | PSLB | PSLB | - | - |
| 0.395 | 10.03 | PSLB | PSLB | PLB | PLB | ||
| 0.435 | 11.05 | - | PLB | PLB | PLB | ||
| 0.472 | 11.99 | - | PLB | PLB | PLB | ||
| 0.545 | 13.84 | - | - | PLB | PLB | ||
| 10 3/4 | 273.05 | 0.35 | 8.89 | PSB | PSB | - | - |
| 0.4 | 10.16 | PSB | PSB | - | - | ||
| 0.45 | 11.43 | PSB | PSB | PSB | PSB | ||
| 0.5 | 12.57 | - | PSB | PSB | PSB | ||
| 0.545 | 13.84 | - | - | - | PSB | ||
| 13 3/8 | 339.72 | 0.38 | 9.65 | PSB | PSB | - | - |
| 0.43 | 10.92 | PSB | PSB | - | - | ||
| 0.48 | 12.19 | PSB | PSB | PSB | PSB | ||
| 0.514 | 13.06 | - | - | PSB | PSB | ||
| 16 | 406.4 | 0.438 | 11.13 | PSB | - | - | - |
| 0.495 | 12.57 | PSB | - | - | - | ||
| 0.656 | 16.66 | P | - | - | - | ||
| 18 5/8 | 473.08 | 0.435 | 11.05 | PSB | - | - | - |
| 20 | 508 | 0.438 | 11.13 | PSLB | - | - | - |
| 0.5 | 12.7 | PSLB | - | - | - | ||
| 0.635 | 16.13 | PSLB | -- | - | - | ||
Mechanical Properties
| Standard | Grade | Yield Strength(Mpa) | Tensile Strength(Mpa) | Hardness(HRC) | Impact Energy(J)(min) | Impact Temperature(℃) |
| API 5CT | J55 | 379-552 | ≥517 | - | T-10-20(SR16) | 21 |
| K55 | 379-552 | ≥655 | - | L-10-27(SR16) | ||
| M65 | 448-586 | ≥586 | ≤22 | T-10-20, L-10-41 | 0 | |
| L80 | 552-655 | ≥655 | ≤23 | C19-20, C76-77(SR16) | ||
| N80 | 552-758 | ≥689 | - | |||
| P110 | 758-965 | ≥862 | - |
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