ASTM A335 P91 steel specification:P91 is a ferritic alloy steel. This material has been in use successfully in power plant service. It is also called 9 Cr 1 Mo steel based on its composition.

ASTM A335 P91 steel chemical composition

Grade	C	Mn	P	S	Si	Gr	Mo
P91	0.08-0.12	0.30-0.60	0.020/0.010	0.020/0.010	0.20-0.50	8.00-9.50	0.85-1.05
	V	N	Ni	Al	Nb	Ti
	0.18-0.25	0.03-0.07	0.40 max	0.02 max	0.06-0.10	0.01max

ASTM A335 P91 steel mechanical composition

grade	Tensile strength, min, (MPa)	Yield strength, min, (MPa)	Elongation, min, (%), L/T
P91	585	415	20/…

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