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