S30409 - ASTM A479/A479M-2025

USA UNS	S30409
ASTM Specification or Grade	304H
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
Minimum Value	0.04	-	-	-	-	18	8
Maximum Value	0.1	1	2	0.045	0.03	20	10.5

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

1 Approximate Comparison Table Austenitic Stainless Steel

China		Japan	United States		International Organization for Standardization	Germany		European Standard
GB	ISC	JIS	AISI	UNS	ISO	DIN EN/DIN	W-Nr.	EN	Numerical Grade
07Cr19Ni10	S30409	SUS 304H	304H	S30409	X6CrNi 18-10 X7CrNi 18-9	X6CrNi18-10	1.4948	X6CrNi18-10	1.4948

2 Approximate Comparison Table

Japan	United States		International Organization for Standardization	France	European Standard		Russia
JIS	ASTM	UNS	ISO	NF EN/NF	EN	Numerical Grade	GOST
SUS304H	304H	S30409	X7CrNi18-9	Z6CN18-09	X6CrNi18-10	1.4948	08KH18N10

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!