API 5L X80QS PSL2 seamless steel pipe is a high-strength low-alloy (HSLA) pipeline solution engineered for sour service (H₂S-containing) oil and gas environments. Manufactured to API Spec 5L (46th Edition) PSL2 requirements, it delivers exceptional strength, low-temperature toughness, and resistance to hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC). The "X80" denotes a minimum yield strength of 80 ksi (551 MPa), while "QS" signifies quality sour service compliance.
1.Dimensional Range & Tolerances:
-Outer Diameter: 168.3 mm (NPS 6) – 610 mm (NPS 24).
-Wall Thickness: 6.35 mm (SCH 40) – 25.4 mm (SCH 160).
-Standard Length: 6 m – 12 m; custom lengths available.
-Outer Diameter Tolerance: ±1% of nominal OD.
-Wall Thickness Tolerance: -12.5% / +15% of nominal WT.
-Weight Tolerance: +10% / -5% of theoretical weight.
2.End Finish & Surface:
-Pipe Ends: Plain end (PE), beveled end (BE) per API 5L.
-Surface Condition: Bare, black varnish, or anti-corrosion coating (per request).
-Packaging: Bundled with steel straps; marked with heat number, size, grade, and API logo.
3.Testing & Inspection:
-Tensile Test: 1 test per heat (longitudinal/transverse).
-Charpy Impact Test: -40°C, 3 specimens per heat.
-Hardness Test: 100% Brinell/HV10.
-Hydrostatic Test: 100% pressure test (per API 5L).
-NDT: 100% ultrasonic testing (UT) for body; optional radiographic testing (RT).
-Corrosion Tests: HIC (NACE TM0284) and SSC (NACE TM0177) per batch.
Technical Data
#Chemical Composition (Heat Analysis, wt%)
| Element | Requirement |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Manganese (Mn) | 1.60–1.85 |
| Silicon (Si) | ≤ 0.45 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.005 |
| Niobium + Vanadium + Titanium | ≤ 0.15 |
| Carbon Equivalent (Pcm) | ≤ 0.23 |
#Mechanical Properties (Minimum)
| Property | Unit | Value |
|---|---|---|
| Yield Strength (Rp0.2) | MPa (ksi) | 551–758 (80–110) |
| Tensile Strength (Rm) | MPa (ksi) | 620–825 (90–120) |
| Yield-to-Tensile Ratio | – | ≤ 0.93 |
| Elongation (50.8 mm gauge) | % | ≥ 18 |
| Charpy Impact Energy (-40°C) | J | Average ≥ 40; Single ≥ 35 |
| Hardness | HB (HV10) | ≤ 248 |
Applications
-Sour Gas/Oil Transportation: Onshore and offshore pipelines in H₂S-containing fields.
-High-Pressure Transmission: Long-distance trunk lines (≥10 MPa operating pressure).
-Arctic & Cold Regions: Pipelines in low-temperature environments (-40°C).
-Deep-Sea Pipelines: Subsea projects requiring high toughness and corrosion resistance.
FAQ
Q1: What does "X80QS" mean?
A1: "X80" = minimum yield strength of 80 ksi (551 MPa); "QS" = Quality Sour, indicating compliance with sour service (H₂S) requirements via HIC/SSC testing.
Q2: What is the difference between PSL1 and PSL2 for X80?
A2: Per API 5L (54th Edition), X80 is only available in PSL2. PSL2 mandates stricter chemical control, 100% UT, low-temperature impact testing, and full traceability-critical for high-strength and sour service applications.
Q3: Can X80QS be used in non-sour environments?
A3: Yes. While optimized for sour service, X80QS's high strength and toughness make it suitable for high-pressure, low-temperature, or critical non-sour projects (e.g., deepwater, Arctic).
Q4: What are the key corrosion tests for X80QS?
A4: Two mandatory tests:
HIC Test (NACE TM0284): 96-hour exposure to pH 3.5 solution; crack length/width/sensitivity ratios ≤ 10%.
SSC Test (NACE TM0177): 72-hour stress test in H₂S-saturated solution; no cracking at 80% of actual yield strength.
Q5: What delivery time can I expect for X80QS PSL2?
A5: Standard lead time is 45–60 days (vs. 25–35 days for PSL1). PSL2 requires additional testing (impact, corrosion) and documentation. Rush orders (30–40 days) available for qualified projects.
Q6: How to verify X80QS PSL2 compliance?
A6: Require the supplier to provide:
Valid API 5L Monogram Certificate.
Material Test Report (MTR) with heat number, chemical/mechanical data, and test results.
Third-Party Inspection (TPI) reports (e.g., SGS, BV) for corrosion and mechanical tests.
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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