API 5L X42 PSL2 LSAW Pipe
API 5L X42 PSL2 LSAW Pipe: Composition, Properties & Equivalents
Detailed technical data for API 5L X42 PSL2 LSAW steel pipe including chemical composition, mechanical and thermal properties, and international grade equivalents.
Hot‑rolled steel plate, cold forming, submerged arc welding, optional coating
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API 5L X42 PSL2 LSAW Pipe Introduction
API 5L X42 PSL2 is a low‑carbon steel grade designed for longitudinal submerged arc welded (LSAW) line pipe used in oil, gas, and water transmission. The PSL2 designation indicates stricter chemical, mechanical, and non‑destructive testing requirements compared to PSL1. X42 offers a minimum yield strength of 290 MPa (42 ksi) combined with good weldability and toughness, making it suitable for onshore and offshore pipelines operating under moderate pressure. The steel is typically micro‑alloyed with vanadium, niobium, or titanium to refine grain structure and meet strength‑toughness balance. Its controlled carbon equivalent ensures reliable field welding and long‑term service integrity.
API 5L X42 PSL2 LSAW Pipe Chemical Composition
The chemistry of API 5L X42 PSL2 is controlled to ensure strength, weldability, and fracture toughness. Limits are taken from API 5L 46th edition, Table 6 for welded pipe. Residual elements (Cu, Ni, Cr, Mo) are restricted to prevent hot‑shortness and maintain corrosion resistance. Carbon equivalent (CEIIW) is limited to avoid cold cracking during welding.
| Element | Standard Requirement (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.22 | For wall thickness ≤ 25 mm |
| Mn | ≤ 1.20 | Deoxidiser and strength enhancer |
| P | ≤ 0.025 | Strict limit for PSL2 |
| S | ≤ 0.015 | Strict limit for PSL2 |
| V | ≤ 0.05 | V+Nb+Ti combined ≤ 0.15% |
| Nb | ≤ 0.05 | Micro‑alloy, grain refinement |
| Ti | ≤ 0.04 | Micro‑alloy, grain refinement |
| Cu | ≤ 0.50 | Residual element limit |
| Ni | ≤ 0.50 | Residual element limit |
| Cr | ≤ 0.50 | Residual element limit |
| Mo | ≤ 0.50 | Residual element limit |
| CEIIW | ≤ 0.43 (C≤0.12%); ≤ 0.45 (C>0.12%) | Carbon equivalent for weldability |
API 5L X42 PSL2 LSAW Pipe Thermal and Electrical Physical Properties
The data below are typical for low‑carbon pipe steel and are not part of the API 5L specification. They are provided as engineering reference values at room temperature unless otherwise noted. Actual values can vary slightly with specific chemical makeup and processing.
| Property | Typical Value | Unit | 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 ν |
| Poisson's Ratio (ν) | 0.29 | – | Room temperature |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶/°C | 20–100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.15 | μΩ·m | 20 °C |
API 5L X42 PSL2 LSAW Pipe Mechanical Properties
Mechanical tests are performed on pipe body (transverse specimens) according to API 5L. Yield and tensile strengths refer to the as‑welded condition. Elongation requirement depends on specimen geometry; the table gives a representative minimum for full‑thickness strip tensile specimens. Charpy impact tests are mandatory for PSL2 at the specified temperature.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (Rt0.5 or ReH) | 290 – 495 | MPa | Transverse, at room temperature |
| Tensile Strength (Rm) | 415 – 655 | MPa | Transverse, at room temperature |
| Elongation (A) | ≥ 22 | % | 50 mm gauge length, full‑thickness strip, transverse |
| Charpy Impact (KV) – average | ≥ 27 | J | 0 °C, full‑size V‑notch, transverse |
| Charpy Impact (KV) – single | ≥ 20 | J | 0 °C, full‑size V‑notch, transverse |
API 5L X42 PSL2 LSAW Pipe Exact International Equivalent Grades for X42 PSL2 LSAW Pipe
| Country/Region | Standard | Grade Designation | Remarks |
|---|---|---|---|
| International (ISO) | ISO 3183 (Petroleum and natural gas industries – Steel pipe for pipeline transportation systems) | L290 (PSL2) | Equivalent yield and tensile strength, PSL2 requirements |
| Europe | EN 10208-2 (Steel pipes for pipelines for combustible fluids – Technical delivery conditions – Part 2: Pipes of requirement class B) | L290MB | Semi‑killed or fully killed, normalized or TMCP option |
| China | GB/T 9711 (Petroleum and natural gas industries – Steel pipe for pipeline transportation systems) | L290 (PSL2) | Adopts ISO 3183, same technical requirements |
| Canada | CAN/CSA Z245.1 (Steel pipe) | Grade 290 Category II | Matching 290 MPa minimum yield, with toughness requirements |
| USA (same standard) | API 5L (Specification for Line Pipe) | X42 PSL2 | The original reference grade |
API 5L X42 PSL2 LSAW Pipe Application Introduction
API 5L X42 PSL2 LSAW pipe is a versatile material primarily employed in moderate‑pressure fluid transmission lines. Its balanced mechanical properties allow for efficient in‑field welding, cold bending, and integration into complex pipeline networks. The PSL2 qualification provides additional assurance for gas and hazardous liquid services.
Product Applications: Cross‑country oil and natural gas transmission pipelines, Subsea flowlines and risers, Municipal water supply and sewage force mains, Tubular structural columns and piling, Fire‑fighting and sprinkler system mains, Casing and conductor pipes in well construction
Processed into products: Long‑run straight pipe sections (LSAW pipes in lengths up to 12‑18 m), Induction bends (hot‑formed pipe bends), Tees, reducers, and forged flanges (made from pipe or compatible plate), Welded steel pipe piles (fabricated by cutting and welding to length), Anchor flanges and thrust blocks, Repair sleeves and split‑T connection pieces
Application industries: Oil and gas upstream/midstream (transmission pipelines, gathering systems, flowlines), Water and wastewater treatment (large‑diameter water mains), Structural engineering (pipe piling, offshore jacket structures, bridge supports), Petrochemical and refining plants (process piping for non‑sour service), Mining and slurry transport (abrasion‑resistant linings can be added)
API 5L X42 PSL2 LSAW Pipe Similar/Alternative Line Pipe Grades for Comparison
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA/Global | API 5L | X46 PSL2 (L320) | Higher yield strength (min 320 MPa); suitable for higher pressure but may require slightly more caution in welding due to higher carbon equivalent. |
| USA/Global | API 5L | X52 PSL2 (L360) | Yield strength min 360 MPa; used for higher pressure pipelines; also a widely available grade with well‑established welding procedures. |
| Europe | EN 10208-2 | L290MB (same strength class) | Already listed as exact equivalent, but available with different delivery conditions (e.g., TMCP) for further toughness improvement. |
Notes:
All mechanical test requirements are for the pipe body; weld and heat‑affected zone properties are verified by separate production tests. For sour service (H₂S containing environments), refer to API 5L Annex H (PSL2S) or ISO 3183 Annex H, which may require additional testing for hydrogen‑induced cracking (HIC) and sulfide stress cracking (SSC). LSAW pipes can be delivered with a variety of external and internal coatings, including three‑layer polyethylene (3‑LPE), fusion‑bonded epoxy (FBE), or coal‑tar enamel, depending on service conditions.
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