N08811 - ASTM A249/A249M-2024(a)

USA UNS	N08811
Corresponding Standard	ASTM A249/A249M-2024(a) Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
Classification	Austenitic Stainless Steel

Chemical Element Composition Content (%)

Component	Fe ^①	C	Si	Mn	P	S	Cr	Ni	Cu	Ti	Al	More
Minimum Value	39.5	0.05	-	-	-	-	19	30	-	0.25	0.25	(Al+Ti)=0.85~1.2
Maximum Value	-	0.1	1	1.5	0.045	0.015	23	35	0.75	0.6	0.6	(Al+Ti)=0.85~1.2

① Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements.

Mechanical Properties

Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
≥450	≥170	≥30	HRB ≤90

1 Approximate Comparison Table Corrosion-Resistant Alloy

2 Approximate Comparison Table Austenitic Stainless Steel

United States	International Organization for Standardization		European Standard
UNS	ISO	Numerical Grade	Numerical Grade
N08811	X8NiCrAlTi33-21	4959-088-11-U	1.4959

3 Approximate Comparison Table Corrosion-Resistant Alloy

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