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Grade WP309
USA UNS S30900
AISI
American Iron and Steel Institute		 309
Corresponding Standard ASTM A403/A403M-2022
Wrought Austenitic Stainless Steel Piping Fittings
Classification Austenitic Stainless Steel
WP309 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni
Minimum Value - - - - - 22 12
Maximum Value 0.2 1 2 0.045 0.03 24 15
WP309 Mechanical Properties
condition Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
%
Pipe Fittings ≥515 ≥204 Standard round specimen, or small specimen, or strip specimen
L0=4D
long: ≥28
tr: ≥20
1 Approximate Comparison Table Austenitic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States Germany France European Standard Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
16Cr23Ni13
(2Cr23Ni13) 		S30920 SUH 309 SUH 309 STR 309 309 S30900 X15CrNiSi 20-12 1.4828 Z15CNS 20-12 X15CrNiSi 20-12 1.4828 20Х20Н14С2 309S24
2 Approximate Comparison Table Austenitic Heat-Resistant Steel
China Japan United States Germany France European Standard Russia United Kingdom
GB JIS ASTM DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
1Cr20Ni14Si2 SUH309 309 X15CrNiSi20-12 Z17CNS20-12 X15CrNiSi20-12 1.4828 20KH20N14S2 309S24

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