A335 Grade P921 K91201 - ASTM A335/A335M-2024(b)

Grade	A335 Grade P921
USA UNS	K91201
Corresponding Standard	ASTM A335/A335M-2024(b) Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Classification	Alloy Steel

A335 Grade P921 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Al
Minimum Value	0.08	1.6	0.5	-	-	8	0.8	0.8	0.8	0.02	-
Maximum Value	0.12	2.2	0.7	0.03	0.02	9.5	1.4	1.4	1.1	0.05	0.04

A335 Grade P921 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
Normalizing（910~950°C） , air cool + Tempering（730~770°C）	≥750	≥580	l: ≥20	HBW: ≤276 HV: ≤290 HRC: ≤26

l=longitudinal；t=transverse

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