API 5L Grade B Round Pipes
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API 5L Grade B is a widely used carbon steel material specification for line pipes, primarily used in the oil and gas industry for transporting oil, gas, and water over long distances. It is part of the API 5L specification, which covers seamless and welded steel line pipes. API 5L Grade B offers good mechanical properties, including a minimum yield strength of 245 MPa, making it suitable for various applications in high-pressure environments. This grade is known for its weldability, durability, and ability to withstand the harsh conditions often encountered in pipeline installations.
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| Property | Specification |
|---|---|
| Standard | API 5L Grade B |
| Chemical Composition | C: ≤ 0.28%, Mn: 1.20-1.40%, P: ≤ 0.030%, S: ≤ 0.030%, Si: ≤ 0.45% |
| Tensile Strength (MPa) | 415 - 655 MPa |
| Yield Strength (MPa) | 245 MPa (minimum) |
| Elongation (%) | 23% (in 2 inches for seamless), 21% (for welded) |
| Hardness (HBW) | Approximately 130-180 HB |
| Modulus of Elasticity (GPa) | 200 - 210 GPa |
| Density (g/cm³) | 7.85 g/cm³ |
| Thermal Conductivity (W/m·K) | 50 W/m·K (at 20°C) |
| Specific Heat Capacity (J/kg·K) | 485 J/kg·K (at 20°C) |
| Heat Treatment | Typically supplied in normalized or as-rolled condition |
| Applications | Line pipes for transporting oil, gas, and water in the petroleum and natural gas industries |
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