S41400 - ASTM A479/A479M-2025

USA UNS	S41400
ASTM Specification or Grade	414
Corresponding Standard	ASTM A479/A479M-2025 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
Classification	Martensitic Stainless Steel

Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni
Minimum Value	-	-	-	-	-	11.5	1.25
Maximum Value	0.15	1	1	0.04	0.03	13.5	2.5

Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
All specifications	Tempering	≥795	≥620	in 2 in.[50 mm] or 4D ≥15	① ≥45	≤321

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