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USA UNS S44400
AISI
American Iron and Steel Institute		 444
Corresponding Standard ASTM A959-2004
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Ferritic Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N Ti More
Minimum Value - - - - - 17.5 - 1.75 - - (Ti+Nb) 0.20+4×(C+N) min, 0.80 max
Maximum Value 0.025 1 1 0.04 0.03 19.5 1 2.5 0.035 0.8
Approximate Comparison Table
China Japan United States International Organization for Standardization France European Standard Sweden
ISC JIS ASTM UNS ISO Numerical Grade NF EN/NF EN Numerical Grade SS
S11972 SUS 444 444 S44400 X2CrMoTi18-2 4521-444-00-I Z3CDT18-02 X2CrMoTi18-2 1.4521 2326

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