API 5L X46 PSL2 LSAW Pipe
API 5L X46 PSL2 LSAW Pipe Properties and International Equivalents
Detailed analysis of API 5L X46 PSL2 LSAW line pipe including chemical composition, mechanical and physical properties, international equivalents, and applications.
Rolling, forming, longitudinal submerged arc welding, possible heat treatment (as-rolled, normalized, thermomechanical rolled, or quenched and tempered for base plate; pipe may be as-welded or stress relieved)
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
API 5L X46 PSL2 LSAW Pipe Introduction
API 5L X46 PSL2 LSAW pipe is a high-strength line pipe steel conforming to API Specification 5L for PSL2 (Product Specification Level 2). It exhibits minimum yield strength of 317 MPa (46 ksi) and is manufactured using longitudinal submerged arc welding (LSAW) process. Key features include excellent weldability, good toughness at low temperatures, and reliable mechanical properties suitable for transportation of oil, gas, and water under high pressure.
- Maximum carbon content controlled for weldability
- Mandatory Charpy impact tests ensure ductility
- Carbon equivalent limits guard against hydrogen cracking
- Available in various wall thicknesses and diameters
API 5L X46 PSL2 LSAW Pipe Chemical Composition
The chemical composition of API 5L X46 PSL2 is designed to provide a balance of strength and toughness while ensuring good weldability. Maximum contents are specified for elements like C, Mn, P, S to avoid embrittlement and cracking. Microalloying elements such as V, Nb, and Ti may be added for grain refinement and precipitation strengthening.
- Phosphorus and sulfur limits are tighter than PSL1 to enhance cleanliness and toughness.
- The carbon equivalent (CE) is limited to ≤0.43% (IIW) to ensure field weldability.
| Chemical Element | Nominal Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.22 | Maximum for welded pipe |
| Manganese (Mn) | ≤ 1.40 | |
| Phosphorus (P) | ≤ 0.025 | PSL2 requirement |
| Sulfur (S) | ≤ 0.015 | PSL2 requirement |
| Silicon (Si) | ≤ 0.45 | If specified |
| Vanadium (V) | ≤ 0.05 | V+Nb+Ti ≤ 0.15% |
| Niobium (Nb) | ≤ 0.05 | V+Nb+Ti ≤ 0.15% |
| Titanium (Ti) | ≤ 0.04 | V+Nb+Ti ≤ 0.15% |
| Carbon Equivalent (CE IIW) | ≤ 0.43 | CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
API 5L X46 PSL2 LSAW Pipe Physical and Thermal Properties
Physical properties such as density, elastic modulus, and thermal conductivity are typical for low-carbon microalloyed steels used in line pipe. These properties are essential for pipeline design, including stress analysis, thermal expansion compensation, and cathodic protection. Values are representative for carbon steel at room temperature and may vary with composition and heat treatment.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Elastic Modulus (E) | 205 | GPa | 20°C |
| Shear Modulus (G) | 80 | GPa | Calculated from E and Poisson's ratio |
| Poisson's Ratio (ν) | 0.30 | — | 20°C |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | /°C | 20–100°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20°C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.20 | Ω·mm²/m | 20°C |
API 5L X46 PSL2 LSAW Pipe Mechanical Properties
Mechanical properties are verified through tensile testing, impact testing, and bend testing according to API 5L. PSL2 requires higher toughness and more stringent testing than PSL1. Test specimens are usually taken from the pipe body transverse to the weld.
- Charpy V-notch impact tests at 0°C are mandatory for PSL2, with minimum average absorbed energy values.
- Elongation is calculated using the API formula, which accounts for specimen dimensions and tensile strength.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 317 - 517 | MPa | Transverse, base metal, room temperature |
| Tensile Strength (Rm) | 434 - 655 | MPa | Transverse, base metal, room temperature |
| Elongation (A) | Min. determined by formula e=1944 A^0.2 / U^0.9 (typical ≥22%) | % | 50 mm gauge length, longitudinal strip specimen, wall thickness ≤ 25.4 mm |
| Charpy Impact (KV) | Average ≥ 27, Single ≥ 20 | J | Transverse, full-size 10×10 mm, 0°C |
| Bend Test | No cracks in weld or base metal | - | 180° bend, mandrel diameter per API 5L |
API 5L X46 PSL2 LSAW Pipe Fully Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA / International | API 5L | X46 PSL2 (L320) | Original specification, LSAW pipe |
| International | ISO 3183 | L320 | Equivalent based on yield strength and chemistry |
| Europe | EN 10208-2 | L320MB | Similar line pipe grade for gas pipelines |
| China | GB/T 9711 | L320 | Chinese standard for line pipe, equivalent to API 5L X46 |
API 5L X46 PSL2 LSAW Pipe Application Introduction
API 5L X46 PSL2 LSAW pipe is extensively used in the energy sector for long-distance pipelines. Its combination of strength and toughness makes it suitable for arctic and subsea applications. Common industries and typical products are listed below:
Product Applications: Transmission pipelines, Offshore risers, Piling pipes, Flowlines
Processed into products: Line pipe sections, Bends, Flanges, Tees, Reducers
Application industries: Oil & Gas, Water Supply, Structural Engineering
API 5L X46 PSL2 LSAW Pipe Similar / Alternative Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA / International | API 5L | X42 PSL2 | Lower yield strength (290 MPa), otherwise similar requirements |
| USA / International | API 5L | X52 PSL2 | Higher yield strength (359 MPa), similar toughness |
| USA / International | API 5L | X46 PSL1 | Less stringent chemistry and mechanical testing, no mandatory impact test |
| Europe | EN 10208-2 | L290MB | Lower strength grade (290 MPa) for less demanding applications |
Notes:
For sour service applications, additional tests such as HIC (Hydrogen Induced Cracking) and SSC (Sulfide Stress Cracking) may be required as per NACE MR0175. The pipe can be ordered with external coatings (e.g., 3LPE, FBE) and internal linings for corrosion protection. Dimensions and tolerances are governed by API 5L. Consult the latest edition of API 5L for full specifications.
- Share
