... . High Quality: ISO900:2000, API5L, API5CL Product Steel Square PipeStandardGB/T3091-2001,BS1387,ASTM A53, ASTM A106, ... tread , or as customers’ requestsProcessing technologyThreading ,coupling and with plastic caps protectedPackageBe packed in bundles, in loose ... packing , wrapped with steel strip or at sellers optionUsageConstruction, bridge, highway, machinery, and so onThird party inspectionSGS, ...