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USA UNS S34709
ASTM
Specification or Grade		 347H
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 More
Minimum Value 0.04 - - - - 17 9 Cb:8×C~1.1
Maximum Value 0.1 1 2 0.045 0.03 19 12
Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
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
Approximate Comparison Table Austenitic Stainless Steel
China Japan United States International Organization for Standardization France European Standard
GB ISC JIS ASTM/AISI UNS ISO Numerical Grade NF EN/NF EN Numerical Grade
07Cr18Ni11Nb
(1Cr19Ni11Nb) 		S34779 SUS347H 347H S34709 X7CrNiNb18-10 4912-347-09-I Z2CND17-11
Z2CND18-13
Z8CNNb18-10 		X7CrNiNb18-10 1.4912

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