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alloy steel ASTM A335 P9 seamless steel pipe for high temperature service 1. ASTM A335 P9 pipe specification ASTM A335 /ASME SA335 P1 P2 P5 P5b P5c P9 P11 P12 P15 P21 P22 P23 P91 P92 P122 P911 ASTM ...