ERW Steel Pipe & ERW Casing
Description
ERW (Electric Resistance Welded ) Steel Pipe, HFW (High-Frequency Welding) Steel Pipe, ERW Casing, ERW Carbon Steel Pipe
Standard: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672, EN 10217
ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.
ERW Pipe
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 | A | 219.1～457 | +15%, -12.5% |
| B | 508～610 | +17.5%, -12.5% | |
| X42-X80 | 508～610 | +19.5%, -8% |
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 | 1.20 | 0.030 | 0.030 | 414 | 241 |
| X42 | 0.26 | 1.30 | 0.030 | 0.030 | 414 | 290 | ||
| X46 | 0.26 | 1.40 | 0.030 | 0.030 | 434 | 317 | ||
| X52 | 0.26 | 1.40 | 0.030 | 0.030 | 455 | 359 | ||
| X56 | 0.26 | 1.40 | 0.030 | 0.030 | 490 | 386 | ||
| X60 | 0.26 | 1.40 | 0.030 | 0.030 | 517 | 414 | ||
| X65 | 0.26 | 1.45 | 0.030 | 0.030 | 531 | 448 | ||
| X70 | 0.26 | 1.65 | 0.030 | 0.030 | 565 | 483 | ||
| PSL2 | B | 0.22 | 1.20 | 0.025 | 0.015 | 414 | 241 | |
| X42 | 0.22 | 1.30 | 0.025 | 0.015 | 414 | 290 | ||
| X46 | 0.22 | 1.40 | 0.025 | 0.015 | 434 | 317 | ||
| X52 | 0.22 | 1.40 | 0.025 | 0.015 | 455 | 359 | ||
| X56 | 0.22 | 1.40 | 0.025 | 0.015 | 490 | 386 | ||
| X60 | 0.22 | 1.40 | 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.
ERW Casing
Standard: API SPEC 5CT
Application: Casing serves as wall of well
Specification
| 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 | – | – | ||
| 0.400 | 10.16 | PSLB | PSLB | PLB | PLB | ||
| 0.450 | 11.43 | – | PLB | PLB | PLB | ||
| 0.500 | 12.70 | – | – | 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 | 0.350 | 8.89 | PSB | PSB | – | – |
| 0.400 | 10.16 | PSB | PSB | – | – | ||
| 0.450 | 11.43 | PSB | PSB | PSB | PSB | ||
| 0.500 | 12.57 | – | PSB | PSB | PSB | ||
| 0.545 | 13.84 | – | – | – | PSB | ||
| 13 3/8 | 339.72 | 0.380 | 9.65 | PSB | PSB | – | – |
| 0.430 | 10.92 | PSB | PSB | – | – | ||
| 0.480 | 12.19 | PSB | PSB | PSB | PSB | ||
| 0.514 | 13.06 | – | – | PSB | PSB | ||
| 16 | 406.40 | 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 | – | – | – |
| 0.500 | 12.70 | PSLB | – | – | – | ||
| 0.635 | 16.13 | PSLB | — | – | – | ||
Dimensional Tolerance
| Standard | Tolerance of O.D. | Tolerance of W.T. | Straightness of Pipe Body | Straightness of Pipe End | Tolerance for Weight |
| API 5CT | +1%, -0.5% | -12.5% | ≤0.2%L | ≤3.18mm | +6.5%, -3.5% |
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
C19-20, C76-77(SR16) | 0 | |
| L80 | 552-655 | ≥655 | ≤23 | |||
| N80 | 552-758 | ≥689 | – | |||
| P110 | 758-965 | ≥862 | – |
Chemical Composition(%)
| Standard | Grade | C | Mn | P | S | Ni | Cu | Si |
| API 5CT | J55 | – | – | ≥0.030 | ≥0.030 | – | – | – |
| K55 | – | – | ≥0.030 | ≥0.030 | – | – | – | |
| M65 | – | – | ≥0.030 | ≥0.030 | – | – | – | |
| L80 | ≥0.43 | ≥1.90 | ≥0.030 | ≥0.030 | ≥0.25 | ≥0.35 | ≥0.45 | |
| N80 | – | – | ≥0.030 | ≥0.030 | – | – | – | |
| P110 | – | – | ≥0.030 | ≥0.030 | – | – | – |
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