... commodity Seamless steel pipeSpecificationsASTM A53/BS 1387 Black Seamless Steel Pipe OD:HRS 2"-30",CDS 0.875"-18" WT: ... ,R3 Quality Standard 1. ASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and ... strength, Yield strength,Elongation), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), Exterior Size ...