API 5L X65Q PSL2 seamless steel pipe is a high-grade carbon steel line pipe strictly manufactured in accordance with the API 5L 45th international standard. The letter "Q" indicates quenched and tempered heat treatment, endowing the pipe with excellent low-temperature toughness, high structural strength and superior sour service resistance. As a PSL2-level product, it features stricter chemical composition control, mandatory impact testing, zero defects in ultrasonic inspection, and more stable mechanical properties compared with PSL1 grade.
This seamless pipe is specially designed for harsh working conditions including onshore & offshore oil and gas transmission, sour medium transportation, and low-temperature pipeline projects. It supports customized 3LPE external anti-corrosion coating to adapt to underground, marine and high-corrosion industrial environments, ensuring long-term service life and operational safety of pipelines.
Core Technical Parameters
1.Basic Specification
Executive Standard: API 5L 45th Edition, GB/T 9711
Grade: API 5L X65Q (PSL2)
Manufacturing Process: Hot rolling + quenching & tempering (QT) seamless forming
Outer Diameter Range: 38mm – 457mm (1.5" – 18") standard sizes
Wall Thickness Range: 2.9mm – 60mm
Standard Length: 6m / 9m / 12m (customizable 1–12m)
Pipe End: Beveled end (30°+5°/-0° per ASME B16.25) / Plain end optional
Delivery Condition: Quenched and tempered (QT)
Maximum Hardness: ≤250 HBW (sour service compliant)
2. Chemical Composition (Heat Analysis, Max %)
Strict PSL2-level component control, low sulfur and low phosphorus design for excellent anti-hydrogen cracking performance
|
Element |
C |
Si |
Mn |
P |
S |
V |
Nb |
Ti |
CE(IIW) |
CE(Pcm) |
|---|---|---|---|---|---|---|---|---|---|---|
|
Content (%) |
0.18 |
0.45 |
1.40 |
0.025 |
0.015 |
0.05 |
0.05 |
0.04 |
0.43 |
0.25 |
3. Mechanical Properties (PSL2 Standard)
|
Item |
Standard Value |
Remark |
|---|---|---|
|
Yield Strength (Rp0.2) |
450 – 585 MPa |
Stable yield performance |
|
Tensile Strength (Rm) |
535 – 758 MPa |
High tensile resistance |
|
Elongation |
≥18% |
Excellent ductility |
|
Yield/Tensile Ratio |
≤0.93 |
PSL2 mandatory index |
|
Charpy V-Notch Impact Energy (CVN) |
Mandatory qualified at -29℃ |
Low-temperature toughness guaranteed |
4.Dimensional Tolerance Range (API 5L PSL2 Standard)
All dimensional tolerances strictly comply with API 5L 45th edition PSL2 seamless pipe specifications, with higher precision than PSL1 grade
-
Outer Diameter Tolerance
OD ≤ 114.3mm: ±0.5mm
OD 114.3mm – 219.1mm: ±0.75mm
OD ＞219.1mm: ±1.0mm
-
Wall Thickness Tolerance
WT ≤ 4.0mm: +0.6mm / -0.5mm
4.0mm ＜ WT ＜ 25.0mm: +15% / -12.5% of nominal thickness
WT ≥ 25.0mm: Max(+3.7mm, +10%t) / Max(-3.0mm, -10%t)
-
Other Tolerances
Straightness: ≤0.15% of total pipe length
Roundness (Ovality): ≤1% of nominal outer diameter
Length Tolerance: +50mm / -0mm (custom length tolerances available)
Pipe End Squareness: ≤1.5mm deviation
3LPE External Anti-Corrosion Coating (Optional)
We provide professional 3LPE (Three-Layer Polyethylene) anti-corrosion coating for X65Q PSL2 seamless pipes, compliant with ISO 21809 and DIN 30670 international standards. It is the most mainstream anti-corrosion solution for buried and subsea oil & gas pipelines, with excellent corrosion resistance, impact resistance and long service life
1.3LPE Coating Layer Structure & Technical Parameters
|
Coating Layer |
Material |
Thickness Standard |
Function & Feature |
|---|---|---|---|
|
1st Layer (Primer)
|
Fusion Bonded Epoxy (FBE) |
≥80μm (standard); 100–400μm (reinforced) |
Chemical bonding with steel surface, excellent adhesion and cathodic disbondment resistance, basic anti-corrosion barrier |
|
2nd Layer (Middle) |
Maleic Anhydride Grafted Copolymer Adhesive |
200–300μm |
Connect FBE layer and PE outer layer, enhance overall coating integrity and peeling resistance |
|
3rd Layer (Outer) |
High-Density Polyethylene (HDPE) |
2.0–3.0mm (customizable) |
Mechanical protection, waterproof, anti-oxidation, anti-impact, resist soil and marine corrosion |
2.3LPE Overall Performance Parameters
Service Temperature: -40℃ ~ +80℃ (continuous working)
Coating Adhesion: ≥100 N/cm (excellent bonding performance)
Dielectric Strength: ≥25 kV/mm
Water Absorption: ≤0.01% (24h immersion)
Service Life: 30–50 years under buried/marine normal working conditions
Surface Treatment Before Coating: Sa 2.5 grade sand blasting, remove rust, oxide and impurities
Application Fields
Relying on low-temperature toughness, sour corrosion resistance and high-pressure bearing capacity, X65Q PSL2 seamless pipes are widely used in high-standard energy and industrial pipeline projects:
- Oil & Gas Transmission: Onshore long-distance crude oil, natural gas and condensate pipelines
- Sour Service Projects: Oilfield pipelines containing hydrogen sulfide (H2S) and carbon dioxide (CO2), compliant with HIC/SCC anti-corrosion requirements
- Offshore & Marine Engineering: Subsea gathering pipelines, offshore platform process pipelines
- Low-Temperature Pipeline Projects: High-latitude and cold-region energy transmission pipelines
- Petrochemical Industry: High-pressure process pipelines for refineries and chemical plants
- Water & Slurry Transportation: High-pressure industrial water delivery and mining slurry pipelines
Main Export Markets
Our API 5L X65Q PSL2 seamless pipes have passed international standard certifications and are widely exported to global high-demand energy markets with stable supply and good market reputation:
--Middle East: Saudi Arabia, UAE, Qatar, Kuwait (large-scale oil and gas field pipeline projects)
--Southeast Asia: Malaysia, Indonesia, Thailand, Vietnam (offshore oil & gas and urban energy pipeline construction)
--Europe: Russia, Germany, Italy, Norway (low-temperature and high-standard industrial pipeline projects)
--North & South America: USA, Canada, Brazil, Argentina (long-distance energy transmission pipelines)
--Africa: Nigeria, Angola, Algeria (oilfield infrastructure construction)
--Central Asia: Kazakhstan, Uzbekistan (cross-border oil and gas pipeline projects)
FAQ
Q1: What is the difference between X65Q PSL2 and ordinary X65 PSL1 pipe?
X65Q PSL2 adopts quenched and tempered heat treatment with stricter chemical composition control (lower S/P content), mandatory low-temperature impact test, higher dimensional precision and zero defect ultrasonic inspection. It has better low-temperature toughness, sour corrosion resistance and structural stability, suitable for harsh and high-risk pipeline projects, while PSL1 is only for conventional common working conditions.
Q2: Is 3LPE coating customizable in thickness and grade?
Yes. We provide standard and reinforced 3LPE coating grades. The FBE primer thickness and outer PE layer thickness can be adjusted according to project requirements (buried, marine, high-corrosion environment). We can also provide customized anti-corrosion solutions such as internal epoxy lining as required.
Q3: Does the product support third-party inspection?
Absolutely. All X65Q PSL2 seamless pipes can support SGS, BV, TUV and other international third-party full-item inspections including chemical composition, mechanical properties, dimensional tolerance, anti-corrosion performance and non-destructive testing (NDT), and provide official inspection reports.
Q4: What working conditions is X65Q PSL2 pipe suitable for?
It is specially applicable for low-temperature environments, sour oil & gas fields (containing H2S/CO2), offshore subsea pipelines, high-pressure long-distance transmission pipelines and other harsh working conditions. It cannot be replaced by ordinary X65 seamless pipes in high-standard energy projects.
Q5: What is the minimum order quantity (MOQ)?
MOQ is 1 ton for standard sizes. We support small batch trial orders and large-scale bulk orders, and provide customized production according to customer's special size, length and anti-corrosion requirements.
Q6: What certificates can you provide?
We can provide API 5L certificate, ISO 9001 quality system certificate, factory original test report, chemical & mechanical property inspection report, non-destructive testing report, and full set of export customs clearance documents.
Our address
Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China
Phone Number ( WhatsApp/Wechat)
+86 16622033809
alisa@tjshenzhoutong.com
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