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Home Material ASTM A249/A249M-2018
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USA UNS S31726
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 C Si Mn P S Cr Ni Mo N
Minimum Value - - - - - 17 14.5 4 0.1
Maximum Value 0.03 1 2 0.045 0.03 20 17.5 5 0.2
Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Solutioning Temperature 1040℃ ≥550 ≥240 ≥35 HRB
≤90
1 Approximate Comparison Table Austenitic Stainless Steel
China United States International Organization for Standardization European Standard
GB ISC AISI UNS ISO Numerical Grade EN Numerical Grade
022Cr19Ni16Mo5N S31723 317LMN S31726 X2CrNiMoN17-13-5
X2CrNiMoN 18-15-5 		4439-317-26-E
4483-317-26-I 		X2CrNiMoN17-13-5 1.4439
(1.4483)
2 Approximate Comparison Table Austenitic Stainless Steel
United States France European Standard
ASTM UNS NF EN/NF EN Numerical Grade
317LMN S31726 Z3CND18-14-05Az X2CrNiMoN17-13-5 1.4439

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