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Home Material ASTM A249/A249M-2018
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USA UNS N08811
Corresponding Standard ASTM A249/A249M-2018
Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
Classification Austenitic Stainless Steel
Chemical Element Composition Content (%)
Component Fe 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
Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Solutioning Temperature 1150℃ ≥450 ≥170 ≥30 HRB
≤90
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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