API 5L Grade X70 High Yield Pipe
API 5L Grade X70 High Yield Pipe is a premium, high-strength carbon steel line pipe primarily used in the long-distance transportation of oil, natural gas, and other fluids under high pressure. The "X70" designation signifies a Specified Minimum Yield Strength (SMYS) of 70,000 psi (485 MPa).
Due to its high yield-to-weight ratio, X70 allows for the design of pipelines with thinner wall thicknesses while maintaining high operating pressures. This reduces the total tonnage of steel required, leading to significant savings in material, transportation, and welding costs. It is typically supplied in PSL2 for high-pressure transmission projects.
Want to reduce total pipeline weight and shipping costs by upgrading to X70? Contact us for a cost-saving analysis today.
API 5L X70 Pipe Specification Table
| Item | Description |
| Standard | API Spec 5L (46th Edition) / ISO 3183 |
| Grade | X70 (L485) |
| Product Specification Level | PSL1 and PSL2 (PSL2 is industry standard for X70) |
| Manufacturing Types | Seamless (SMLS), ERW, LSAW, SSAW |
| Outer Diameter (OD) | 2" – 24" (Seamless), up to 100" (Welded) |
| Wall Thickness (WT) | SCH 10 to SCH XXS (Up to 60mm) |
| Length | SRL, DRL, Triple Random, or Fixed Lengths |
| End Finish | Beveled End (BE), Plain End (PE) |
API 5L X70 Material Equivalent Table
| Standard | Equivalent Grade |
| ISO 3183 | L485 |
| Chinese GB/T 9711 | L485 |
| European EN 10208-2 | L485NB / L485QB |
| Canadian CSA Z245.1 | Grade 483 |
| ASTM (Fittings) | ASTM A860 WPHY 70 |
| ASTM (Flanges) | ASTM A694 F70 |
Chemical Requirements Table (Max % for PSL2)
Note: Micro-alloying elements like Nb, V, and Ti are added to achieve high yield strength.
| Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Nb+V+Ti |
| 0.24% (SMLS) | 1.80% | 0.025% | 0.015% | 0.45% | ≤ 0.15% |
| 0.22% (Welded) | 1.70% | 0.025% | 0.015% | 0.45% | ≤ 0.15% |
| Carbon Equivalent | CEiiw ≤ 0.43 |
Mechanical Properties Table (PSL2)
PSL2 requires a specific range to ensure the steel is not too brittle.
| Property | Value (Grade X70 / L485) |
| Yield Strength (Min - Max) | 485 - 635 MPa (70,300 - 92,100 psi) |
| Tensile Strength (Min - Max) | 570 - 760 MPa (82,700 - 110,200 psi) |
| Yield to Tensile Ratio | ≤ 0.93 (Maximum) |
| Impact Energy (Charpy V) | Mandatory for PSL2 (e.g., 27J or higher at 0°C) |
API 5L X70 Pipe Wall Thickness & Schedule Chart
Common dimensions in mm for X70 Line Pipe (Reference ASME B36.10M).
| NPS | OD (mm) | SCH 40 (STD) | SCH 80 (XS) | SCH 120 | SCH 160 |
| 8" | 219.1 | 8.18 | 12.70 | 18.26 | 23.01 |
| 12" | 323.8 | 10.31 | 17.48 | 25.40 | 33.32 |
| 16" | 406.4 | 12.70 | 21.44 | 31.75 | 40.49 |
| 20" | 508.0 | 15.09 | 26.19 | 38.10 | 50.01 |
| 24" | 610.0 | 17.48 | 30.96 | 46.02 | 59.54 |
Test Requirements of API X70 (PSL2)
X70 High Yield pipe must undergo rigorous testing to ensure safety in high-stress environments:
Hydrostatic Test: 100% of pipes tested to ensure no leakage under internal pressure.
Tensile Test: Verification of yield and tensile strength limits.
Charpy V-Notch (CVN) Impact Test: Measures fracture toughness (Mandatory for PSL2).
Drop Weight Tear Test (DWTT): For pipes > 16" OD, used to verify ductile fracture behavior in gas transmission.
Non-Destructive Testing (NDT): Ultrasonic (UT) or X-ray inspection of the full body (Seamless) or weld seam (Welded).
Guided-Bend / Flattening Test: For welded pipes to ensure weld integrity.
API 5L X70 Oil and gas pipe lines Factory
API 5L X70 Carbon Steel Line Pipe Test Equipments
API 5L X70 Oil and gas transmission pipe Certificate
FAQ
What is the carbon content of API 5L X70?
The carbon content of API 5L X70 depends on whether the pipe is PSL1 or PSL2 and whether it is Seamless (SMLS) or Welded.
According to the API 5L specification (46th Edition), the maximum carbon content limits are as follows:
Maximum Carbon Content (Weight %)
| Product Level | Manufacturing Type | Max Carbon (C) |
| PSL1 | Seamless (SMLS) | 0.28% |
| PSL1 | Welded | 0.26% |
| PSL2 | Seamless (SMLS) | 0.24% |
| PSL2 | Welded | 0.22% |
What is the tensile strength of X70?
The tensile strength of API 5L X70 pipe is the maximum stress the material can withstand before it actually breaks.
According to the API 5L specification, the requirements vary between PSL1 and PSL2 (Product Specification Levels):
Tensile Strength Values
| Specification Level | Minimum Tensile Strength | Maximum Tensile Strength |
| PSL1 | 570 MPa (82,700 psi) | Not Specified |
| PSL2 | 570 MPa (82,700 psi) | 760 MPa (110,200 psi) |
Hot Tags: api 5l grade x70 high yield pipe, China api 5l grade x70 high yield pipe manufacturers, suppliers, factory, seamless api 5l pipe, api 5l line pipe with high strength, api 5l pipe for steam transportation, api 5l pipe for mining, large diameter api 5l line pipe, api 5l pipe for industrial gases transportation
You Might Also Like
Send Inquiry