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USA UNS N08811
Corresponding Standard ASTM A213/A213M-2019
Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger 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 0.06 - - - - 19 30 - 0.15 0.15 Al+Ti：0.85~1.20
Maximum Value - 0.1 1 1.5 0.045 0.015 23 35 0.75 0.6 0.6
Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
≥450 ≥170 ≥30 ≤192
1 Approximate Comparison Table Corrosion-Resistant Alloy
China United States
GB ISC Commercial Grade UNS
NS 1104 H 08811 Incoloy 800HT N 08811
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
United States Germany
Commercial Grade UNS DIN EN/DIN W-Nr.
Incoloy 800HT N08811 X8NiCrAlTi32-21 1.4959

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