X52 is a medium-strength grade offering high cost-effectiveness, ideal for conventional onshore systems, with excellent weldability and short procurement lead times.
X65 is a high-strength line pipe steel with enhanced strength, toughness, and corrosion resistance, making it the preferred choice for high-pressure, long-distance, and harsh environments (e.g., offshore, arctic, sour service).
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API 5L X52 and X65 Parameter Comparison Table
| Item | API 5L X52 | API 5L X65 | Description |
|---|---|---|---|
| Yield Strength (Rt₀.₅) | 358–530 MPa (PSL2) | 448–600 MPa (PSL2) | X65 has higher strength, suitable for high-pressure long-distance pipelines |
| Tensile Strength (Rm) | 455–760 MPa (PSL2) | 535–760 MPa (PSL2) | X65 exhibits superior tensile performance |
| Yield-to-Tensile Ratio (Rt₀.₅/Rm) | ≤ 0.93 | ≤ 0.93 | Both require good plastic reserve to prevent brittle fracture |
| Carbon Equivalent (Ceq) | ≤ 0.43% | ≤ 0.43% | Both require controlled Ceq to minimize cold cracking during welding |
| Low-Temperature Impact Toughness | -20°C ≥ 40J (PSL2) | -20°C ≥ 80–100J (PSL2, some requirements higher) | X65 offers superior toughness for cold or offshore environments |
| Hardness Requirement | Generally no special requirement | ≤ 250 HV10 (for HIC/SSC resistance) | X65 often requires NACE MR0175/MR0103 compliance in sour environments |
| Manufacturing Process | Seamless (hot-rolled/cold-drawn) or welded (LSAW/HFW) | Primarily straight-seam welded (JCOE/LSAW) or seamless; commonly uses TMCP (Thermo-Mechanical Control Process) or Quench & Tempering (Q&T) | X65M/X65Q suffixes denote enhanced performance via specialized processing |
| Typical Applications | Medium-to-low pressure onshore pipelines, urban gas distribution, conventional oil & gas transport | High-pressure long-distance transmission, offshore pipelines, H₂S-containing sour service, arctic projects | X65 is preferred for high-risk, high-integrity applications |
| Common Suffix Designations | X52M (TMCP), X52N (normalized) | X65M (TMCP), X65Q (quenched & tempered), X65QS (sour service resistant), X65MO (molybdenum-alloyed) | Suffixes indicate delivery condition and special performance characteristics |
API 5L X52 X65 Pipe for high pressure gas transportation Common Standard Sizes
| Nominal Size (in) | OD (mm) | WT (mm) | Weight (kg/m) | Application |
|---|---|---|---|---|
| 0.84 | 21.3 | 2.8 | 0.85 | Instrument tubing, low-flow transfer |
| 1.315 | 33.4 | 3.4 | 1.68 | Station internal piping |
| 2.375 | 60.3 | 3.2 – 5.1 | 3.00 – 5.03 | Medium-pressure oil/gas gathering |
| 4 | 114.3 | 6.0 – 8.6 | 15.9 – 22.3 | Mainline branches, city gas distribution |
| 8 | 219.1 | 8.2 – 12.7 | 42.5 – 64.6 | Medium-long distance transmission |
| 16 | 406.4 | 9.5 – 19.1 | 92.7 – 180 | Major trunk lines, onshore-to-offshore transition |
| 20 | 508 | 12.7 – 25.4 | 152 – 300 | High-pressure long-distance, strategic energy corridors |
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FAQ
What is an X65 pipe?
It is commonly used in main pipeline transportation systems for oil and natural gas. X65 steel grade has a yield strength ≥ 450MPa and tensile strength ≥ 535MPa. X65 high-grade steel pipes are commonly used for long-distance transportation, such as straight-seam submerged arc welded pipes for liquefied natural gas.
What is API 5L X52 equivalent to?
L360 steel
According to chemical composition, mechanical properties and so on technical data comparison, the API 5L X52 equivalent plate material is L360 steel, which is usually made into L360 steel plates or L360 steel pipes used in the petroleum and gas industry for pipeline transportation systems.
What is the equivalent to API 5L X65?
API 5L X65 pipe is also called ISO 3183 L450 pipe, it is a high level grade pipe in API 5L (ISO 3183) specifications, used for oil and gas transmissions. The reason we call it X65 pipe or L415 pipe is because it's minimum yield strength required in 65000 Ksi or 450 Mpa.