A541 Grade 4N Class 3 - ASTM A 541/A541M-2005(2020)

Grade	A541 Grade 4N Class 3
Corresponding Standard	ASTM A 541/A541M-2005(2020) Standard Specification for Quenched and Tempered Carbon and Alloy Steel Forgings for Pressure Vessel Components
Classification	Alloy Steel

A541 Grade 4N Class 3 Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S	Cr	Ni	Mo	V
Minimum Value	-	-	0.2	-	-	1.25	2.8	0.4	-
Maximum Value	0.23	0.3	0.4	0.025	0.025	2	3.9	0.6	0.03

① When vacuum carbon-deoxidation is required for the classes included in Supplementary Requirement S10, the silicon content shall be 0.10 % max.

A541 Grade 4N Class 3 Mechanical Properties

Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
620~795	≥485	≥20	≥48	4 °C：≥47

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