API Spec 5L Pipeline Steel Coil Steel Plate Material Overview & Core Advantages
API 5L PSL1/PSL2 certified pipeline steel delivers 550 MPa+ yield strength for critical energy infrastructure, combining HIC-resistant chemistry with Arctic-grade toughness. X70 grade achieves -40°C impact energy of 200J while maintaining 0.85% strain capacity.
Competitive Edge:
- Sour Service Compliance: NACE MR0175 for H₂S environments (PSL2).
- Global Equivalency: EN 10208 L415MB (X60), DIN 17172 StE 480.7 (X70).
- Welding Efficiency: 1.5kJ/mm heat input tolerance (AWS D1.8 compliant).
Technical Specifications
1. Chemical Composition (API 5L 2023 Edition)
| Grade | C Max | Mn Range | CEV* | HIC Test Result |
|---|---|---|---|---|
| X42 | 0.24% | 1.00–1.30% | 0.38 | ≤1.5mm crack length |
| X65 | 0.18% | 1.40–1.65% | 0.42 | ≤0.8mm crack length |
| X70 | 0.16% | 1.60–1.80% | 0.45 | ≤0.5mm crack length |
| *CEV = C + Mn/6 + (Cr+Mo+V)/5 |
2. Mechanical Performance
| Grade | Yield (MPa) | Tensile (MPa) | CVN @-30°C | Hardness (HV) |
|---|---|---|---|---|
| X52 | 359–524 | 455–758 | 60J | ≤245 |
| X60 | 414–620 | 517–827 | 80J | ≤265 |
| X70 | 483–690 | 565–865 | 100J | ≤280 |
Physical Properties:
- Density: 7.85g/cm³
- Thermal Expansion: 12.5µm/m°C (20–150°C)
Manufacturing & Processing
1. Production Control
- TMCP Technology: Accelerated cooling rate 25°C/s (X70 grade).
- Ultrasonic Testing: API 5L App.H Level III (PSL2 mandatory).
2. Field Installation
| Process | Parameter | Industry Standard |
|---|---|---|
| GMAW | 1.2-2.0mm/s | API 1104 Chapter 6 |
| Induction Bending | 1.5–3° per D | ASME B16.49 |
Industrial Applications
1. Energy Transmission
- Arctic Pipelines: X65 grade (-60°C design temperature).
- Subsea Risers: X70 with 30mm WT (DNV-OS-F101 certified).
2. Strategic Projects
| Project | Material Grade | Technical Achievement |
|---|---|---|
| Nord Stream 2 | X70 | 1,224mm diameter × 41mm WT |
| Keystone XL | X80 | 80,000 PSI test pressure |
Quality Compliance
- Mandatory Tests:
- HIC Test: NACE TM0284 Solution A
- DWTT: 85% shear area @-15°C (X65+)
- Certifications:
- ISO 3183:2019 Annex H
- API Monogram License
Supply Specifications
- Dimensions:
- Width: 1,500–4,500mm (coil weight 45t max).
- Thickness Tolerance: ±0.15mm (PSL2 milled edge).
- Packaging: VCI film + desiccant (36-month storage).
Welding Tip: Preheat 100–150°C for X70 using E8018-G electrodes*
Technical Footnotes:
- X65 achieves 0.07mm/year corrosion rate in pH3.5 sour gas.
- Maximum allowable ovality: 1.5% of OD (ASME B31.8).
Why Choose API 5L Pipeline Steel?
Compared to ASTM A106, API 5L X70 provides 2.3x higher collapse resistance in deepwater applications. The precise TMCP process enables 40mm+ wall thickness without HAZ softening.
Environmental Note: 95% recycled content with 9.1kg CO₂/t production (ISO 14064-1).
Global Equivalents:
| API 5L | EN 10208 | DIN 17172 | JIS G3457 | Application |
|---|---|---|---|---|
| X42 | L290NB | StE 290.7 | STPT410 | Onshore Gas |
| X60 | L415QB | StE 415.7 | STPT570 | LNG Terminals |
| X70 | L485MB | StE 480.7 | STPT670 | Deepwater Risers |
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