API 5L X56 seamless pipe/tube dimension:
outer diameter:21.3-1016mm
thickness:3-65mm
Grades covered by this specification are A25, A, B and "X" Grades X42, X46, X52, X56, X60, X65, X70, and X80. The two digit number following the "X" indicates the Minimum Yield Strength (in 000's psi) of pipe produced to this grade.
PSL 1 is a standard quality for line pipe where PSL 2 contains additional chemical, mechanical properties, and testing requirements.
API 5L X56 PSL 1 chemical composition
| C | Mn | P | S | Si | Nb | Ti |
| 0.28 | 1.40 | 0.030 | 0.030 |
API 5L X56 PSL 2 chemical composition
| C | Mn | P | S | V | Si | Ti |
| 0.18-0.24 | 1.40-1.50 | 0.025 | 0.015 | 0.07-0.10 | 0.45 | 0.04 |
API 5L X56 PSL 1 seamless pipe/tube mechanical properties
| Yield Strength | Tensile Strength | Elongation | Yield to tensile ratio max |
| Mpa min | Mpa (ksi) min | Min %1 | |
| 390 | 490 |
API 5L X56 PSL 2 seamless pipe/tube mechanical properties
| Yield Strength | Tensile Strength | Elongation | Yield to tensile ratio max |
| Mpa | Mpa (ksi) min | Min %1 | 0.93 |
| 390-545 | 490-760 |
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