API 5L X60 line pipe bridges the gap between standard mid-strength grades (X42–X52) and high-strength grades (X70, X80). With a minimum yield strength of 60,000 psi (414 MPa), X60 enables higher operating pressures and thinner wall sections in transmission pipelines — saving steel tonnage, welding time, and freight on long-distance cross-country and international pipelines. This page covers the full technical and supply spec for Huaxia-Steel X60 PSL2 line pipe.
Product Overview
API 5L X60 is a micro-alloyed, controlled-rolled line pipe steel. The minimum specified yield strength is 60,000 psi (414 MPa) at room temperature. Compared to X52, X60 allows approximately 15% higher operating pressure at the same wall thickness, or 12–15% thinner wall at the same pressure — a meaningful saving when shipping thousands of tonnes of pipe across oceans.
X60 is commonly used in:
- Long-distance gas transmission trunk lines.
- High-pressure gas distribution feeder lines.
- Offshore platform export flowlines.
- Refinery and petrochemical plant high-pressure piping.
- Slurry transport in long-distance mining pipelines.
- CO₂ injection lines for carbon capture and storage (CCS) projects.
Available Manufacturing Process
- Seamless (SMLS) — for high-pressure fittings, risers, and small-diameter service. Limited to NPS 26.
- ERW (Electric Resistance Welded) — most common for X60 NPS 2 to NPS 24. After 1990 the ERW process has been qualified for X60 sour service with controlled rolling.
- LSAW (Longitudinal Submerged Arc Welded) — dominant for NPS 20 to NPS 48 transmission lines. Heavy wall X60 LSAW is standard for cross-country gas.
- SSAW / HSAW (Helical Submerged Arc Welded) — for NPS 20 to NPS 100 piling and line-pipe.
Chemical Composition (PSL2, Heat Analysis, ≤ NPS 25)
| Element | Maximum % | Notes |
|---|---|---|
| Carbon (C) | 0.26 | Lower for sour service / CCS |
| Manganese (Mn) | 1.40 | — |
| Phosphorus (P) | 0.030 | PSL2 mandatory |
| Sulfur (S) | 0.030 | PSL2 mandatory |
| Vanadium (V) | 0.10 | For Nb+V+Ti ≤ 0.20 |
| Niobium (Nb) | 0.10 | — |
| Titanium (Ti) | 0.04 | — |
| Carbon Equivalent (CE) | 0.43 max (NPS ≤ 36) | For sour service: lower |
Micro-alloying with Nb, V, and Ti (alone or in combination) is standard for X60 to achieve the required strength without excessive carbon. This improves weldability and lowers CE.
Mechanical Properties
| Property | Requirement (PSL2) |
|---|---|
| Yield Strength Rp0.2 | 414–565 MPa (60–82 ksi) |
| Tensile Strength Rm | ≥ 517 MPa (75 ksi) |
| Y/T Ratio (max) | 0.93 |
| Elongation in 2 in. | ≥ 20% |
| Charpy Impact (0 °C, full-size) | ≥ 27 J (long) / ≥ 21 J (trans) |
| Hardness (for sour service) | ≤ 22 HRC |
| Hardness (general) | ≤ 250 HV10 typical |
For subsea or arctic pipelines, drop-weight tear test (DWTT) at -20 °C must show ≥ 85% shear area. This is a separate test from Charpy and is mandatory for many offshore projects.
Standard Dimensions and Unit Weight
Huaxia-Steel supplies X60 in standard schedules plus project-specific wall thicknesses. Below are reference values for common sizes:
| NPS (in) | OD (mm) | Sch 40 Wall (mm) | Sch 40 Weight (kg/m) | Sch 80 Wall (mm) | Sch 80 Weight (kg/m) |
|---|---|---|---|---|---|
| 4 | 114.3 | 6.02 | 16.07 | 8.56 | 22.32 |
| 6 | 168.3 | 7.11 | 28.26 | 10.97 | 42.67 |
| 8 | 219.1 | 8.18 | 42.55 | 12.70 | 64.64 |
| 10 | 273.1 | 9.27 | 60.31 | 15.09 | 96.01 |
| 12 | 323.9 | 10.31 | 79.73 | 17.48 | 132.05 |
| 16 | 406.4 | 12.70 | 123.30 | 21.44 | 203.54 |
| 20 | 508.0 | 15.09 | 183.43 | 26.19 | 311.19 |
| 24 | 609.6 | 17.48 | 255.27 | 30.96 | 442.11 |
| 30 | 762.0 | — | — | — | — |
| 36 | 914.4 | — | — | — | — |
For NPS 26 and above, X60 is almost always LSAW with wall thicknesses from 8 mm to 25 mm (depending on design pressure). Tolerance: OD ±1.0%, wall -12.5% per API 5L.
Manufacturing Standards
- API 5L (45th / 46th edition, PSL2) — primary spec.
- ISO 3183 — international equivalent.
- ASME B36.10M — dimensional standard.
- NACE MR0175 / ISO 15156 — for sour H₂S service.
- DNV-OS-F101 — offshore submarine pipeline standard (X60 commonly used for shallow-water flowlines).
- CSA Z662 — Canadian oil and gas pipeline standard (X60 allowed up to certain design factors).
Typical Applications
- High-pressure gas transmission trunk lines (3–8 MPa operating pressure).
- Refinery high-pressure hydrogen piping.
- Offshore export flowlines from platforms to shore.
- CO₂ injection and storage lines for CCS projects (X60 preferred for the higher strength at depth).
- Long-distance slurry pipelines for mining concentrate (e.g., iron ore concentrate).
- Compressor station discharge piping and headers.
Quality Assurance and Testing
- Chemical analysis (heat and product) per ASTM A415.
- Tensile tests: yield, ultimate, elongation, Y/T ratio.
- Charpy V-notch impact — 3 specimens at project temperature.
- Drop-weight tear test (DWTT) for subsea / arctic projects.
- Hydrostatic test at mill test pressure (calculated per API 5L).
- Hardness survey (Brinell or Vickers) for sour-service compliance.
- Non-destructive testing — 100% ultrasonic on weld seam, radiographic spot-check, MPI on pipe ends.
- Dimensional and visual inspection.
Mill test certificate per EN 10204-3.1 or API 5L Annex E. Third-party inspection available from SGS, BV, TUV, or Intertek.
Marking and Traceability
Pipe ends are stenciled per API 5L with manufacturer, grade (e.g., “5L X60 PSL2”), process (SMLS / ERW / LSAW / SSAW), heat number, NPS, wall thickness, length, and standard reference year. Color coding per API 5L Annex G: X60 is typically marked with a yellow band.
Packaging and Shipping
- Hexagonal bundle for Sch 40 and lighter; bundle weight 1.5–3 tonnes; steel strip binding with plastic end caps.
- Loose in 40-ft container for large-diameter LSAW; up to NPS 36 fits in standard container.
- Bulk vessel for orders above 5,000 tonnes; loaded by crane with end protectors and pipe-end caps.
- Beveled ends per ASME B16.25, default 30° ±5°. Square-cut available on request.
- Internal anti-corrosion coating optional (e.g., FBE, coal tar epoxy).
- External coating optional (3LPE, 3LPP, coal tar epoxy, polyurethane).
Order API 5L X60 Line Pipe from Huaxia-Steel
Huaxia-Steel supplies API 5L X60 PSL2 line pipe from leading Chinese mills in SMLS, ERW, LSAW, and SSAW. Our mills are certified to API 5L monogram for X60/X65/X70/X80, and we coordinate third-party agency witnessing (SGS, BV, TUV) for sour service and offshore projects. Send your specification (project, NPS, wall, service, end prep, coating) to [email protected] for a mill-direct quote within 24 hours.
Related products: API 5L X46 Line Pipe · API 5L X65 Line Pipe · API 5L X70 Line Pipe
