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API 5L PSL1 & PSL2 steel pipes product specifications 1.Manufacture Standard: GB/T 9711, ISO 3183, API 5L PSL1 & PSL2, ASTM A53, CSA 245.1, IPS 190 NACE-MR-0175etc 2.Steel Grade: L245~L485, GR.B~X70M, ...