S30940 - ASTM A479/A479M-2025

USA UNS	S30940
ASTM Specification or Grade	309Cb
Corresponding Standard	ASTM A479/A479M-2025 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
Classification	Austenitic Stainless Steel

Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	More
Minimum Value	-	-	-	-	-	22	12	Cb:10×C~1.1
Maximum Value	0.08	1	2	0.045	0.03	24	16	Cb:10×C~1.1

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 %
All specifications	Annealing	① ≥515	≥205	in 2 in.[50 mm] or 4D ≥30	② ≥40

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