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Grade 309
USA UNS S30900
Corresponding Standard ASTM A959-2004
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Austenitic Stainless Steel
309 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
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
309 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
309 S30900
2 ASTM A276/A276M-2017
309 S30900
3 GB 2100-1980
309 ZG1Cr18Mn8Ni4N
4 ASTM A473-2018
309 S30900
5 ASTM A959-2019
309 S30900
6 ASTM A403/A403M-2022
309 WP309 S30900

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