What Are The Specific Differences In Inspection Requirements Between PSL1 And PSL2?

① PSL1 is not required to be subject to impact performance test, and PSL2 must be subject to and specifies the minimum absorbed energy (e.g. transverse ≥ 27J); ② PSL1 does not require NDT, and PSL2 requires NDT one by one; ③ PSL1 only specifies the minimum value of yield strength, PSL2 specifies the minimum value and the maximum value at the same time, and control the yield ratio ≤ 0.93; ④ PSL2 has more strict restrictions on the content of sulfur, phosphorus and other impurities (S ≤ 0.015%, P ≤ 0.025%); ⑤ PSL2 requires an upper limit of carbon equivalent to ensure weldability.