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ASTM A335 P9 Base Tube Composition Grade UNS Designation C Mn P S Si Cr Mo P9 K90941 0.15 0.30-0.60 0.025 0.025 0.25-1.00 8.0-10.0 0.9-1.1 ASTM A335 P9 Serrated Fin Tube Strength 1. Material Strength ...