API 5LB pipeline steel is a steel grade in the pipeline steel pipe specification formulated by the American Petroleum Institute, and its corresponding grade is L245. The steel grades in the API 5L standard include A, B, X42, X46, X52, X56, X60, X65, X70, X80, X90, X100, X120, etc.
Chemical composition and mechanical properties
Chemical Composition API 5L Pipes Grade B Line Pipe
| PSL 2 | ||||||||||||
| GRADE | Chemical Composition | Mechanical Property | ||||||||||
| C (Max) |
Mn (Max) |
P (Max) |
S (Max) |
Tensile | Yield | C. E. IMPACT ENERGY | ||||||
| Psi x 1000 | Mpa | Psi x 1000 | Mpa | PCM | IIW | J | FT/LB | |||||
| B | 0.22 | 1.20 | 0.025 | 0.015 | 60 - 110 | 414 - 758 | 35 - 65 | 241 - 448 | 0.25 | 0.43 | T/L 27/41 | T/L 20/30 |
API 5L Grade B PSL 2 Line Pipe Physical Properties
| API 5L Grade | Yield Strength min. (ksi) |
Tensile Strength min. (ksi) |
Yield to Tensile Ratio (max.) |
Elongation min. %1 |
| B | 35 | 60 | 0.93 | 23 |
Production process and heat treatment
The production process of API 5LB pipeline steel includes microalloying heating treatment. Heat treatment methods include low-temperature tempering (150-250 degrees), medium-temperature tempering (250-500 degrees) and high-temperature tempering (500-650 degrees). The hardness after low-temperature tempering is generally HRC58-64, the hardness after medium-temperature tempering is generally HRC35-50, and the hardness after high-temperature tempering is generally HB200-3303.
Use
API 5LB pipeline steel is mainly used for oil and gas pipelines and is suitable for pipeline systems of various pressure levels. Due to its good welding performance and low cost, it is widely used in the oil and gas industry.
API 5L gr b carbon pipe
