A335 Grade P91 Type 2 K90901 - ASTM A335/A335M-2024(b)

Grade	A335 Grade P91 Type 2
USA UNS	K90901
Corresponding Standard	ASTM A335/A335M-2024(b) Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Classification	Alloy Steel

A335 Grade P91 Type 2 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	As	N	Ti	W	V	Nb	Zr	B	Al	Sn	Sb	More
Minimum Value	0.08	0.2	0.3	-	-	8	-	-	0.85	-	0.035	-	-	0.18	0.06	-	-	-	-	-	N/Al≥ 4
Maximum Value	0.12	0.4	0.5	0.02	0.005	9.5	0.2	0.1	1.05	0.01	0.07	0.01	0.05	0.25	0.1	0.01	0.001	0.02	0.01	0.003	N/Al≥ 4

A335 Grade P91 Type 2 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
normalizing（1040~1080°C）+ tempering（730~800°C）, or quenching（1040~1080°C）+ tempering（730~800°C）	≥585	≥415	l: ≥20	HBW: 190~250 HV: 196~265 91 HRBW~25 HRC

l=longitudinal；t=transverse

New and Old Grade Replacement List

A335GradeP91Type2 Corresponding Standards(Same grade name, different standards)

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