ASTM A959:2011 XM-33: Ferritic stainless steel type XM-33 (UNS S44626) with the composition limits of ASTM A959-11. Carbon up to 0.06% and chromium 25.0-27.0%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Cu
Mn
Mo
N
Ni
P
S
Si
<=0.06
25.0-27.0
<=0.20
<=0.75
0.75-1.50
<=0.040
<=0.50
<=0.040
<=0.020
<=0.75
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S44626
Metallurgical class
Ferritic grade: body-centered cubic, little or no tempered martensite, hardenable only slightly by cold working
Type
XM-33 (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
Other elements (as printed)
Cu 0.20, Ti 7x(C+N)-1.00, and Ti 0.20 min
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.
Source: ASTM A959:2011, Table 1 and its footnotes
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