API 5L Grade B line pipe is the global specification baseline for oil, gas, and water transmission pipelines. Available in PSL1 and PSL2, and in multiple manufacturing routes (ERW, LSAW, SSAW, SMLS), API 5L Gr.B covers the bulk of mild-strength line pipe applications from gathering systems to trunk lines and water distribution mains.
Huaxia-Steel supplies API 5L Grade B PSL1 and PSL2 line pipe factory direct from ISO-certified Chinese mills, with full MTC EN 10204 3.1, API Spec 5L compliance, third-party inspection on request, and global ocean shipping.
Product Overview
API Specification 5L is the industry standard for line pipe used in pipeline transportation systems. Published by the American Petroleum Institute, the 47th edition (2013) added numerous enhancements and clarified requirements, particularly for higher-grade steels used in modern transmission pipelines. Grade B (tensile 414 MPa minimum) is the most-popular mild-strength grade, with X42-X80 available for higher-pressure service.
Specifications
Standard & Grade
- Standard: API Spec 5L, 46th or 47th Edition (latest 48th, 2024)
- Grade options: A, B (PSL1); B, X42, X46, X52, X56, X60, X65, X70, X80 (PSL2)
- PSL options: PSL1 (commercial line pipe) or PSL2 (mandatory impact + chemical control)
- Manufacturing routes: SMLS (seamless), ERW (electric resistance welded), LSAW (longitudinal submerged arc welded), SSAW (spiral/ helical submerged arc welded), HFW (high-frequency welded)
- End finish: Plain end (PE), beveled for welding, threaded (limited sizes), coupled (limited)
Dimensional Range
| Parameter | Range |
|---|---|
| NPS (Diameter) | 1/2″ – 56″ |
| Wall Thickness | 2.0mm – 60mm (depending on diameter) |
| Length | DRL (6-7m), SRL (3-5m), 12m, 18m fixed for LSAW |
| Outside Diameter Tolerance | ±1.0% (standard) / ±0.5% (tight) |
| Wall Thickness Tolerance | ±10-12.5% (varies by method) |
| Coatings | Black, FBE, 3LPE, 3LPP, galvanized, coal tar enamel |
Mechanical Properties (API 5L PSL1, Grade B)
| Property | Grade B PSL1 |
|---|---|
| Yield Strength (min) | 241 MPa (35,000 psi) |
| Tensile Strength (min) | 414 MPa (60,000 psi) |
| Elongation (min, 2 inch gauge) | Refer to API 5L Table 4 (varies by specimen) |
| Hydrostatic Test | Required per Section 6.2 |
Mechanical Properties (PSL2 Reference)
| Grade | Yield (MPa, min) | Tensile (MPa, min) | Y/T Ratio (max, optional) |
|---|---|---|---|
| Grade B PSL2 | 241 | 414 | 0.85 |
| X42 PSL2 | 290 | 414 | 0.85 |
| X52 PSL2 | 360 | 460 | 0.90 |
| X60 PSL2 | 414 | 517 | 0.92 |
| X65 PSL2 | 450 | 535 | 0.92 |
| X70 PSL2 | 485 | 570 | 0.93 |
| X80 PSL2 | 555 | 625 | 0.94 |
Chemical Composition (PSL2 Limits, % max)
| Grade | C | Mn | P | S | Si | CEV (typical) |
|---|---|---|---|---|---|---|
| Grade B | 0.24 | 1.20 | 0.030 | 0.030 | 0.45 | 0.40 |
| X42 | 0.26 | 1.30 | 0.030 | 0.030 | 0.45 | 0.42 |
| X52 | 0.22 | 1.40 | 0.025 | 0.020 | 0.45 | 0.40 |
| X65 | 0.18 | 1.70 | 0.025 | 0.020 | 0.45 | 0.32 |
| X70 | 0.16 | 1.70 | 0.020 | 0.015 | 0.45 | 0.32 |
| X80 | 0.14 | 1.85 | 0.020 | 0.010 | 0.45 | 0.30 |
Note: PSL2 CEV limits are much tighter than PSL1. For sour service or high-pressure transmission, request PSL2 with full impact + CEV reporting.
PSL1 vs PSL2 — Choosing the Right Specification Level
| Feature | PSL1 | PSL2 |
|---|---|---|
| Charpy impact test | Optional | Mandatory at design temperature |
| Chemical limits | Looser | Tighter (individual element control) |
| CEV requirement | By agreement | Mandatory, reported on MTC |
| Traceability | Heat identification | Heat + coil + pipe number |
| Surface defects | Visual inspection | 100% EM or ultrasonic |
| Typical use | Gathering, water mains, low-pressure | Transmission, sour service, offshore |
| Cost premium vs LSAW Grade B | Baseline | +5-12% |
Manufacturing Route Reference
| Route | Typical Diameter | Grades Available | Application |
|---|---|---|---|
| SMLS (seamless) | 1/2″ – 26″ | A, B, X42-X80 | High-pressure, sour service, wellhead |
| ERW | 2″ – 24″ | A, B, X42-X70 | General transmission, gas distribution |
| HFW (high-frequency) | 1″ – 20″ | X42-X70 | Sour service qualified transmission |
| LSAW (longitudinal SAW) | 16″ – 56″ | B, X42-X80 | Major transmission, large diameter |
| SSAW (spiral SAW) | 12″ – 100″+ | A, B, X42-X80 | Water transmission, low-pressure trunk lines |
Typical Applications
- Oil & gas: Gathering lines, trunk lines, distribution mains, flow lines, injection lines
- Water transmission: Long-distance water mains, irrigation, raw water supply
- Subsea pipelines: With supplementary requirements for sour service, fracture arrest, and buckle arrestors
- Slurry & tailings: Mining pipelines (often with thick wall + sacrificial allowance)
- Fire water systems: Onshore facilities, LNG plants, refineries
- Offshore piping: Platform intra-field piping (with additional specifications)
Sour Service Qualification (PSL2 + Supplementary)
For H2S-containing service (sour environments), API 5L PSL2 pipe is supplied with additional testing per ISO 15156 / NACE MR0175 and Annex H of the specification:
- HIC test: Hydrogen-Induced Cracking (NACE TM0284, solution A or B)
- SSC test: Sulfide Stress Cracking (NACE TM0177, Method A, B, or C at 24°C, 4-day duration minimum)
- Hardness control: Surface hardness ≤22 HRC (250 HBW) per ISO 15156
- Coating compatibility: Anti-HIC coatings and storage procedures
- Marking: Pipes for sour service marked “S” suffix (e.g., X65MS)
The qualification is project-specific — your engineering specification should reference which NACE test conditions apply. Huaxia-Steel can arrange full sour-service qualification, including HIC/SSC retesting and certification, through our inspection partners.
Manufacturing & Quality Control
- API Spec 5L: All requirements for chemistry, testing, marking per the latest edition
- EN 10204 3.1: Mill test certificate supplied with every shipment
- ISO 3183: International standard for line pipe properties (often referenced in tenders)
- ASME B31.4 / B31.8: Pipeline code references for US transmission
- Hydrostatic test: 100% of pipe, at pressures per API 5L Section 6.2
- NDT: 100% electromagnetic (eddy current) or ultrasonic inspection for PSL2 weld seam
- Dimensional inspection: OD, wall, ovality, straightness per spec
Quality Assurance
- MTC EN 10204 3.1: Heat analysis, tensile results, hydrostatic test report, CEV (PSL2)
- Charpy test report (PSL2): Three specimens per heat/lot at design temperature (typically -29°C or -46°C)
- Coating certificate: FBE thickness, holiday test result, adhesion test (if coated)
- Third-party inspection: SGS / BV / TUV / Intertek (USD 280-450 per inspector day)
- Markings: Manufacturer name, API monogram, grade, PSL, heat number, pipe number, dimension per API 5L Annex A
Packaging and Shipping
- Bundle protection: Steel-band hexagonal bundles, end protectors, plastic wrap optional
- Coating protection: Pipe ends protected by plastic caps to prevent moisture and debris
- Special handling: FBE / 3LPE coated pipe is stored on padded racks to avoid coating damage
- Container/bulk shipment: Smaller diameters in 20’/40’GP bundles; large diameter in bulk on dedicated vessels
- Lead time: 4-6 weeks for stock grades; 6-10 weeks for sour service and special PSL2
How to Order
- Specifications: API 5L, grade, PSL, manufacturing route, OD, wall thickness, length, end finish
- Service conditions: Sour/sweet, design temp, design pressure, fluid type
- Testing: Charpy temperature, HIC/SSC if sour, additional cert requirements
- Coating: Black, FBE, 3LPE, 3LPP, special coating requirements
- Third-party inspection: Required? Agency?
- Delivery terms: FOB / CIF / DDP to project site or port
Get a Quote
Need API 5L Grade B or higher grade (X42-X80) line pipe for your project? Contact Huaxia-Steel with specifications (grade, PSL, manufacturing route, OD, wall, length, coating, delivery port) to receive a competitive mill-direct quotation. We supply ERW, HFW, LSAW, SSAW, and seamless API 5L line pipe with full 3.1 MTC, NACE/HIC/SSC qualification on request, third-party inspection on request, and global shipping.
