API 5L Grade B Pipe Overview
API 5L Grade B pipe is a specification developed by the American Petroleum Institute (API) for line pipe used in the oil and gas industry. It defines the mechanical, chemical, and physical requirements for carbon steel pipes that transport gas, water, and oil.
Our Quality ProductsCarbon Steel Pipe
Mill Certifications accompany all graded material. We still carry structural grade, limited service and secondary for non critical structural applications where no mill certifications are required.
ASTM Grades:
API Grades:
- API5L Gr B
- API5L X-42 through X-70
API 5L Grade B Overview
- Specification: API 5L (Specification for Line Pipe)
- Grade: B
- Application: Transmission of oil, gas, and water in the pipeline industry
- Product Type: Seamless (SMLS) or Welded (ERW, LSAW, SSAW)
- Standard Number: API 5L - ISO 3183
Chemical Composition (Typical)
| Element | Grade B (max %) |
|---|---|
| Carbon (C) | 0.26 |
| Manganese (Mn) | 1.20 |
| Phosphorus (P) | 0.030 |
| Sulfur (S) | 0.030 |
Mechanical Properties:
| Property | Grade B |
|---|---|
| Yield Strength (min) | 35,000 psi (240 Mpa) |
| Tensile Strength | 60,000 psi (415 Mpa) |
| Elongation | Varies with size/thickness |
Product Specification Levels:
- PSL1: Standard quality level; suitable for general transmission lines.
- PSL2: Enhanced requirements for chemical/mechanical properties, notch toughness, and testing.
Manufacturing Methods:
- Seamless Pipe (SMLS): Hot-rolled or cold-drawn without a welded seam.
- Welded Pipe:
- ERW (Electric Resistance Welded)
- LSAW (Longitudinal Submerged Arc Welded)
- SSAW (Spiral Submerged Acr Welded)
Common Applications:
- Oil and gas transmission pipelines
- Structural and pressure applications
- Water and slurry transportation
- Offshore and onshore line pipe systems
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