API 5L X56 material is one of the most widely used pipeline steel materials. It is according to the American Petroleum Institute specification API 5L. API 5L X56 material is classified into two specification levels: API 5L X56 PSL1 and API 5L X56 PSL2. For different delivery conditions: API 5L X56 PSL2 has some variants,and they are X56N, X56Q and X56M.
The chemical composition of API 5L X56 material variants:
| API 5L X56 PSL2 | C | Si | Mn | P | S | V | Nb | Ti | Other | CEIIW | CEPcm |
| X56N | 0.24 | 0.45 | 1.40 | 0.025 | 0.015 | 0.10 | 0.05 | 0.04 | d,e,l | 0.43 | 0.25 |
| X56Q | 0.18 | 0.45 | 1.50 | 0.025 | 0.015 | 0.07 | 0.05 | 0.04 | d,e,l | 0.43 | 0.25 |
| X56M | 0.22 | 0.45 | 1.40 | 0.025 | 0.015 | d | d | d | e,l | 0.43 | 0.25 |
d. Nb+V+Ti≤0.15%.
e . Unless otherwise agreed, Cu≤0.50 %; Ni≤0.30 %; Cr≤0.30 % and Mo≤0.15 %.
l. Unless otherwise agreed no intentional addition of B is permitted and residual B≤0.001 %.
The mechanical properties of API 5L X56 material variants:
| API 5L X56 PSL2 | Yield Strength | Tensile Strength a | Ratio a,c | ||
| Rt0.5 MPa (psi) | Rm MPa (psi) | Rt0.5/Rm | |||
| min. | max. | min. | max. | max. | |
| X56N | 390 (56,600) | 545 (79,000) | 490 (71,100) | 760 (110,200) | 0.93 |
| X56Q | 390 (56,600) | 545 (79,000) | 490 (71,100) | 760 (110,200) | 0.93 |
| X56M | 390 (56,600) | 545 (79,000) | 490 (71,100) | 760 (110,200) | 0.93 |
API 5L X56 material indicates 56000 PSI minimum yield strength and 71000 PSI minimum ultimate tensile strength. API 5L X56 material is mainly used to fabricate seamless and welded steel line pipes for pipeline transportation systems in the petroleum and natural gas industries.
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