API 5L X52 and X42 are two commonly used pipeline steels in oil and gas transmission systems. X52 has a significantly higher strength grade than X42 and is suitable for service environments with higher pressure and higher risk.
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API 5L X52 vs X42 Parameter Comparison Table
| Item | API 5L X52 | API 5L X42 | Difference Notes |
|---|---|---|---|
| Steel Grade Designation | X52 (L360) | X42 (L290) | X52 has higher strength grade, suitable for higher-pressure systems |
| Minimum Yield Strength (MPa) | 359 MPa (PSL1) / 360 MPa (PSL2) | 290 MPa (PSL1) / 290 MPa (PSL2) | X52 is ~24% stronger than X42, offering greater load capacity |
| Minimum Tensile Strength (MPa) | 455 MPa (PSL1) / 455–655 MPa (PSL2) | 415 MPa (PSL1) / 415–655 MPa (PSL2) | X52 has higher minimum tensile strength, ideal for high-pressure long-distance pipelines |
| Yield-to-Tensile Ratio (YR) | ≤ 0.93 (PSL1), ≤ 0.90 (PSL2) | ≤ 0.93 (PSL1), ≤ 0.90 (PSL2) | Identical control limits ensure adequate ductility reserve for both grades |
| Carbon Equivalent CE(IIw) | ≤ 0.43% (PSL2 with TMCP process) | ≤ 0.43% (PSL2 with TMCP process) | Equivalent weldability requirements; both suitable for automated welding |
| Impact Toughness (0°C CVN) | ≥ 41 J (PSL2) | ≥ 41 J (PSL2) | Same minimum Charpy V-notch requirement under PSL2, ensuring low-temperature safety |
| Typical Applications | High-pressure mainlines, cross-border pipelines, offshore landing sections | Medium-pressure gathering lines, station internal piping, urban gas distribution | X52 is preferred for high-stress, high-risk environments; X42 suits lower-pressure distribution |
| Common Manufacturing Methods | LSAW (large diameter), ERW/SSAW (medium/small diameter) | LSAW, ERW, seamless pipes | Similar processes; X52 demands stricter weld quality control |
| HIC/Sour Service Option | Available as X52QS (acid-resistant) | Available as X42QS (H₂S corrosion-resistant) | Both can be customized for sour service conditions in H₂S-containing environments |
API 5L X42 X52 Carbon Steel Line Pipe Common Size Specifications
| Nominal Size (in) | OD (mm) | WT (mm) | Weight Range (kg/m) | Application Scenario |
|---|---|---|---|---|
| 0.84 | 21.3 | 2.8 | 0.85 | Instrumentation lines, low-flow pipelines |
| 1.315 | 33.4 | 3.4 | 1.68 | Station connections, control lines |
| 2.375 | 60.3 | 3.2–5.1 | 3.00–5.03 | Medium-pressure gathering, branch lines |
| 4 | 114.3 | 6.0–8.6 | 15.9–22.3 | Urban gas distribution |
| 8 | 219.1 | 8.2–12.7 | 42.5–64.6 | Medium-to-long distance transmission |
| 16 | 406.4 | 9.5–19.1 | 92.7–180 | National trunk lines, offshore landing sections |
| 20 | 508 | 12.7–25.4 | 152–300 | High-pressure long-haul, strategic energy corridors |
GNEE API 5L High Yield Line Pipes factory
FAQ
What is API 5L X42 material?
It is a carbon steel pipe with extremely low levels of carbon. The alloy mix for API 5L X42 pipes commonly consists of manganese, phosphorous and sulfur. These elements promote mechanical strength in the pipe.
What are the properties of X42 material?
Material properties are a minimum yield strength of 42,100 psi (290 MPa) and a minimum tensile strength of 60,200 psi (415 MPa). It is one grade higher than API 5L Grade B and is suitable for medium-strength applications. X42 is commonly manufactured in Seamless, SSAW, LSAW, and ERW.
What are the properties of X52 steel?
The most significant characteristics of X52 steel include its high yield strength, good toughness, and excellent weldability. These properties are essential for pipelines that must withstand high pressures and harsh environmental conditions.