AF91 - GB /T 14383-2021

Performance Level	AF91
Corresponding Standard	GB /T 14383-2021 Forged Fitting, Socket-Welding and Threaded
Classification	Alloy Steel

AF91 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Ti	V	Nb	Zr	Al
Minimum Value	0.08	0.2	0.3	-	-	8	-	-	0.85	0.03	-	0.18	0.06	-	-
Maximum Value	0.12	0.5	0.6	0.02	0.01	9.5	0.4	0.2	1.05	0.07	0.01	0.25	0.1	0.01	0.02

AF91 Mechanical Properties

Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
≥585	≥415	≥20	≥40	≤250

① Yield Point: For pipe fittings of the stainless steel category, the specified non-proportional elongation strength Rp0.2 is used. For pipe fittings of other material categories, when the lower yield strength ReL is not clearly defined, the specified non-proportional elongation strength Rp0.2 is used.

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