ASTM A959:2011 XM-17: Austenitic stainless steel type XM-17 (UNS S21600) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 17.5-20.5%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Mn
Mo
N
Ni
P
S
Si
<=0.08
17.5-20.5
7.5-9.0
2.00-3.00
0.25-0.50
5.0-7.0
<=0.045
<=0.030
<=1.00
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S21600
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
XM-17 (numbering system developed and applied by ASTM)
Values
Maximum unless a range or minimum is shown; where two limits are shown for the same element in one grade the more stringent applies
These are the recommended composition limits of the A959 guide, intended for adoption by standards for stainless steel products; they are not a product specification. As printed: carbon printed as 0.08E (stray E marker); loaded as 0.08 max.
Source: ASTM A959:2011, Table 1 and its footnotes
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