ASTM A335 P91 Pipe Specification (Chrome Moly Pipe)
Chemical Composition and for other P grade Pipe (P5, P9, P11, P22) P91 Pipe Tensile Strength, Yield Strength. Elongation. Elongation in 2 in or 50mm or 4D minimum%: For wall thickness 5/16 in [8mm] and over: Longitudinal 30% and Transverse 20%. ... Standard and Grades: ASTM A335 / ASME SA335 Grade P9, P5, P1, P11, P22, P91