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USA UNS S44004
AISI
American Iron and Steel Institute		 440C
Corresponding Standard ASTM A959-2019
Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Martensitic Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Mo
Minimum Value 0.95 - - - - 16 -
Maximum Value 1.2 1 1 0.04 0.03 18 0.75
• Unless otherwise indicated, a grade designation originally assigned by the American Iron and Steel Institute (AISI).
1 Approximate Comparison Table Martensitic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
108Cr17
(11Cr17)
9Cr18 		S44096 440C SUS 440C STS 440C 440C S44004 X105CrMo 17
A-1b
(ISO 683-13-1986) 		X105CrMo 17 1.4125 Z100CD17 X105CrMo 17 1.4125 95Х18
2 Approximate Comparison Table Martensitic Stainless Steel
China Japan United States International Organization for Standardization Germany European Standard
GB ISC JIS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. EN Numerical Grade
102Cr17Mo
(9Cr18Mo) 		S45990 SUS 440C 440C S44004 X105CrMo 17
A-1b
(ISO 683-13-1986) 		X105CrMo 1.4125 X105CrMo 17 1.4125
3 Approximate Comparison Table Martensitic Stainless Steel
China Japan United States International Organization for Standardization European Standard
GB ISC JIS UNS ISO Numerical Grade Numerical Grade
108Cr17 S44096 SUS440C S44004 X110Cr17 4023-440-04-I (1.4023)

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