USA UNS S44002
AISI
American Iron and Steel Institute
440A
Corresponding Standard ASTM A959-2004
Standard Guide for 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 0.6 - - - - 16 -
Maximum Value 0.75 1 1 0.04 0.03 18 0.75
1 Approximate Comparison Table Martensitic Stainless Steel
China Taiwan, China Japan South Korea United States
GB ISC CNS JIS KS ASTM UNS
68Cr17
(7Cr17)
S44070 440A SUS 440A STS 440A 440A S44002
2 Approximate Comparison Table Martensitic Stainless Steel
China Japan United States International Organization for Standardization European Standard
ISC JIS UNS ISO Numerical Grade Numerical Grade
S44070 SUS440A S44002 X68Cr17 4040-440-02-X (1.4040)

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