API 5L X70 PSL2 LSAW Steel Pipe
Products Description
API 5L X70 PSL2 LSAW Steel Pipeis a high-strength, longitudinal submerged arc welded (LSAW) line pipe manufactured to the American Petroleum Institute (API) 5L standard, Product Specification Level 2 (PSL2). Designedlong-distance oil, natural gas, and high-pressure fluid transmission, it delivers exceptional mechanical strength, low-temperature toughness, and corrosion resistance-ideal for harsh onshore, offshore, and acidic environment projects.
Key Advantages:
"High Strength & Toughness:X70 grade (minimum yield strength 485 MPa) handles high operating pressures; PSL2 ensures stricter chemical composition, mechanical properties, and notch toughness than PSL1.
"LSAW Precision Manufacturing:Formed from heavy steel plates, single longitudinal weld with submerged arc welding-uniform wall thickness, excellent weld integrity, and large diameter capability (16"-60").
Premium Anti-Corrosion Coatings:Customizable 3PE, FBE, epoxy, or galvanized coatings for long-term protection against soil, water, and chemical corrosion.
"Full API 5L PSL2 Compliance:Strict non-destructive testing (NDT), hydrogen-induced cracking (HIC) resistance, and traceability for global energy projects.
Technical Specifications
|
Item |
Specification |
|---|---|
|
Standard |
API 5L (46th Edition), PSL2; ISO 3183 |
|
Grade |
X70 (L485) |
|
Manufacturing Process |
LSAW (Longitudinal Submerged Arc Welded) |
|
Diameter Range |
16" (406.4mm) - 60" (1524mm) |
|
Wall Thickness |
6mm - 40mm (customizable) |
|
Length |
6m - 18m (standard); custom lengths available |
|
Ends |
Beveled (30°), plain, or threaded; capped for protection |
|
Tolerance |
Diameter: ±1%; Wall thickness: ±12.5% |
Chemical Composition (PSL2, wt%)
|
Element |
C |
Mn |
Si |
P |
S |
Nb+V+Ti |
|---|---|---|---|---|---|---|
|
Max |
0.12 |
1.60 |
0.45 |
0.025 |
0.015 |
0.15 |
Mechanical Properties (PSL2)
|
Property |
Minimum |
Maximum |
Unit |
|---|---|---|---|
|
Yield Strength (Re) |
485 |
605 |
MPa |
|
Tensile Strength (Rm) |
570 |
760 |
MPa |
|
Elongation (A) |
20 |
- |
% |
|
Charpy V-Notch Toughness (-20°C) |
≥ 40 |
- |
J |
|
Yield-to-Tensile Ratio |
- |
0.93 |
- |
Anti-Corrosion Coatings (Customizable):
-3PE (Three-Layer Polyethylene):2.5-3.5mm thickness; excellent resistance to soil stress, moisture, and chemicals-ideal for buried pipelines.
-FBE (Fusion Bonded Epoxy):250-500μm thickness; high adhesion, acid/alkali resistance-suitable for offshore and acidic environments.
-Liquid Epoxy Coating:300-600μm thickness; cost-effective for onshore non-corrosive areas.
-Hot-Dip Galvanizing:85-120μm thickness; rust protection for structural and low-pressure applications.
|
Coating Type |
Application |
Standards |
Key Feature |
|
FBE (Fusion Bonded Epoxy) |
Single or dual-layer corrosion protection |
ISO 21809, NACE RP0394 |
Excellent chemical resistance; ideal for mild corrosive environments |
|
3LPE / 3LPP (3-Layer Polyethylene / Polypropylene) |
External corrosion & mechanical protection |
DIN 30670, ISO 21809 |
Superior mechanical strength; most widely used for buried pipelines |
|
Concrete Weight Coating (CWC) |
Offshore pipeline negative buoyancy & stability |
ISO 21809-5 |
Heavy weight prevents floating in marine installations |
|
Coal Tar Epoxy / Bitumen |
Long-term corrosion protection |
DIN 30670, BS 534 |
Classic solution with proven history |
|
Internal Coating |
Hydraulic efficiency & internal corrosion protection |
API RP 5L2 |
Reduces friction loss; extends service life for wet gas/crude |
Applications
|
Application |
Specific Use Cases |
|
Onshore Oil & Gas Trunklines |
Long-distance crude oil, natural gas, and refined product transmission; high-pressure gas gathering networks |
|
Offshore & Subsea Pipelines |
Deepwater risers, flowlines, and trunklines requiring negative buoyancy and high pressure tolerance |
|
Sour Service Pipelines |
H₂S-containing oil and gas fields (with HIC-resistant supplementary requirements |
|
Low-Temperature / Arctic Regions |
Pipelines in frozen terrains requiring Charpy impact testing at -10°C to -45°C |
|
Strain-Based Design Pipelines |
Seismic zones and permafrost regions |
|
Water Transmission Mains |
Large-diameter water supply and sewage conveyance |
|
Structural Piling |
Foundation piling for bridges, ports, and offshore platforms |
|
Gas Compression Plants |
High-pressure interconnecting piping in processing facilities |
Frequently Asked Questions (FAQ)
Q1: What is the difference between API 5L PSL1 and PSL2?
PSL1: Standard requirements with only minimum yield/tensile limits; no mandatory Charpy impact testing; looser chemistry limits.
PSL2: Enhanced requirements including maximum yield and tensile limits, mandatory Charpy impact testing, tighter carbon equivalent (CE) limits, and 100% NDT requirements. PSL2 provides guaranteed fracture toughness and stricter quality control - essential for sour service, low-temperature, and offshore applications.
Q2: Why choose X70 instead of X65 or X80?
|
Grade |
Strength |
Wall Thickness Efficiency |
Cost |
|
X65 |
448 MPa |
Baseline reference |
~ 1.0x |
|
X70 |
483 MPa |
~8-10% thinner walls vs X65; ~15% weight savings vs X52 |
~ 1.10x |
|
X80 |
552 MPa |
Maximum thin-wall capability |
~ 1.30x |
X70 offers the best strength-to-cost ratio for most long-distance, high-pressure projects. X80 is more expensive and requires stricter welding controls
Q3: What testing is mandatory for API 5L X70 PSL2?
✅Hydrostatic Pressure Test (each pipe)
✅100% Non-Destructive Testing - Ultrasonic (UT) + Radiographic (RT) of weld seam
✅Chemical Composition Analysis (per heat / per product)
✅Mechanical Property Testing (Yield, Tensile, Elongation)
✅Charpy Impact Test (minimum 3 specimens at specified temperature)
✅Dimensional & Visual Inspection
✅Full Traceability - Heat number & pipe number recorded
✅Mill Test Certificate (MTC) - EN 10204 Type 3.1 / 3.2
Q4: Is X70 suitable for sour service (H₂S environments)?
Standard X70 PSL2 isnot automatically sour service compliant. For sour service (H₂S-containing environments), the pipe must meetHIC (Hydrogen Induced Cracking)andSSC (Sulfide Stress Cracking)resistance requirements perNACE MR0175 / ISO 15156, with supplementary testing and restricted hardness limits. Specify "Sour Service" on your purchase order
Q5: What documentation is provided with each shipment?
-Mill Test Certificate (MTC) - EN 10204 Type 3.1 or 3.2
-Chemical composition (per heat and per product)
-Mechanical test results (Yield, Tensile, Elongation, Charpy Impact)
-Hydrostatic test report
-NDT report (UT / RT of weld seam)
-Dimensional inspection report
-Heat number traceability log
-Coating inspection report (holiday testing, adhesion, thickness)
-Packing list & Bill of Lading
For critical projects, third-party inspection witnessed reports can be arranged.
Q6: What is the maximum diameter and wall thickness available?
Up to OD 1,625mm (64″) and WT 60mm (2.36″). Larger diameters (up to 72″ / 1,828 mm) are available upon request.
Q7: How to place an order?
Provide the following specification elements:
-API 5L X70 PSL2 LSAW pipe
-Quantity (in meters, joints, or metric tons)
-Outside Diameter (e.g., 24″, 36″, 48″)
-Wall Thickness (e.g., 12.7 mm, 19.1 mm)
-Length (Single Random, Double Random, or exact cut lengths)
-End Finish (Beveled or Plain)
-Coating Requirement (3LPE, FBE, CWC, etc.)
-Supplementary Requirements (Sour service, low-temperature impact, etc.)
-Delivery terms (FOB, CIF, CFR) and destination
