Difference between steel pipe API5L PSL1 and API51 PSL2:
1. PSL is the abbreviation of Product Specification Level. The product specification level of line pipe is divided into PSL1 and PSL2, and it can also be said that the quality level is divided into PSL1 and PSL2.
PSL2 is higher than PSL1. These two specification levels are not only different in inspection requirements, but also in chemical composition and mechanical properties. Therefore, when ordering according to API 5L, the terms in the contract should not only indicate the usual indicators such as specifications and steel grades. , must also indicate the product specification level, that is, PSL1 or PSL2.
PSL2 is stricter than PSL1 in terms of chemical composition, tensile properties, impact energy, non-destructive testing and other indicators.
2. PSL1 does not require impact performance, and PSL2 requires all steel grades except x80.
3. The line pipe should be subjected to hydrostatic test one by one, and the standard does not allow non-destructive substitution of water pressure, which is also a big difference between the API standard and the Chinese standard. PSL1 does not require non-destructive testing, and PSL2 should be non-destructive testing one by one.
