API 5L X46 Pipe
Premium API 5L X46 (L320) Carbon Steel Line Pipe
API 5L X46 Pipe (L320) represents a mid-range high-yield strength grade in the API 5L specification. With a minimum yield strength of 46,400 psi (320 MPa), it offers improved structural integrity for conveying oil, gas, and water. X46 pipes are highly valued for their balanced performance—providing higher pressure ratings than X42 while maintaining excellent formability and weldability for complex pipeline networks.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | API SPEC 5L (46th Edition) / ISO 3183 |
| Grade | X46 or L320 / PSL1 / PSL2 |
| Size Range | 0.405" to 80" (Custom sizes available) |
| Wall Thickness | WT 2.0mm up to 60mm (SCH 10 to SCH XXS) |
| Manufacturing | Seamless, ERW, HFW, LSAW, SSAW |
| Surface Finish | Bare, Oiled, Mill Varnish, Galv, 3LPE, 3LPP |
Mechanical Properties
| Property | X46 (PSL1) | X46 (PSL2) |
|---|---|---|
| Min Yield Strength | 46,400 psi (320 MPa) | 46,400 psi (320 MPa) |
| Max Yield Strength | None | 76,100 psi (525 MPa) |
| Min Tensile Strength | 63,100 psi (435 MPa) | 63,100 psi (435 MPa) |
| Max Tensile Strength | None | 110,200 psi (760 MPa) |
Chemical Composition (Maximum %)
| Element | PSL1 (X46) | PSL2 (X46) |
|---|---|---|
| Carbon (C) | 0.28% | 0.24% |
| Manganese (Mn) | 1.40% | 1.40% |
| Phosphorus (P) | 0.030% | 0.025% |
| Sulphur (S) | 0.030% | 0.015% |
| Silicon (Si) | - | 0.45% |
| Niobium (Nb) | 0.05% | 0.05% |
| Vanadium (V) | 0.06% | 0.06% |
Features and Benefits of API 5L X46 Pipe
- Superior Yield Strength for increased safety margins in high-pressure lines
- Suitable for both Sweet and Sour service (H2S environments)
- Optimized chemical composition for improved low-temperature toughness
- Low carbon equivalent (CEQ) for easier on-site welding
- Tight dimensional tolerances ensured through cold expansion processes
- High resistance to hydrogen-induced cracking (HIC) in PSL2
- Long service life even in corrosive soil conditions with proper coating
- Versatile application in both onshore and offshore pipeline construction
Applications & Uses
Gas Transmission
Used in high-pressure natural gas gathering and transmission mainlines across long distances.
Marine Pipelines
Excellent for jetty piping and shallow-water offshore pipelines conveying crude oil and gas.
Energy Sector
Vital for thermal power plants and renewable energy projects requiring reliable fluid transport.