USA UNS S44020
AISI
American Iron and Steel Institute
440F
Corresponding Standard ASTM A582/A582M-2012(R2017)
Free-Machining Stainless Steel Bars
Classification Martensitic Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.95 - - - 0.15 16 - -
Maximum Value 1.2 1 1.25 0.06 - 18 0.5 0.6
Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Annealing ≤285
Approximate Comparison Table
China Taiwan, China Japan South Korea United States
GB ISC CNS JIS KS ASTM UNS
Y108Cr17
(Y11Cr17)
S44097 440F SUS 440F STS 440F 440F S44020

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