API 5L, ASTM A106, A53 Carbon and Alloy Steel Pipe FAQ
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. PSL is the short name of product standard level.
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