... seamless alloy steel pipe and tube ASTM A199,A335,DIN17175 P11,P22,P5,P91,T11,T22,T5,T91 ST52,13CrMo44,10CrMo9 prime alloy steel seamless ... pipe ame:A335 P11 alloy seamless steel ... to requirement.2)Anti-corrosion and high-temperature resistantwith black painting. alloy steel pipe/tube