What Are PSL1 And PSL2? What Is The Difference?

PSL (Product Specification Level) is the product specification level specified in API 5L and GB/T 9711. PSL1 provides pipeline steel pipes with ordinary quality level, while PSL2 provides a higher quality level, which increases mandatory requirements for chemical composition, hardness, notch toughness, strength performance and supplementary non-destructive testing. PSL1 only specifies the lower limit of yield and tensile strength, while PSL2 specifies the lower limit and upper limit, and makes mandatory requirements for Charpy impact test, carbon equivalent and other indicators. PSL2 pipe prices are typically 5% - 15% higher than PSL1.