API 5L ASTM A53 ASTM A106 Seamless Carbon Steel . API 5L PSL1 and PSL2 Differences for the Steel Line Pipe . API 5L line pipe (Seamless and welded pipe ) of all grades have PSL1 and PSL2 two product specifications, they are different on chemical composition, manufacturing processes, mechanical strength, heat treatment, test records, traceability etc. Line pipes in API 5L PSL2 is higher than PSL1 a.
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