ASTM A959:2011 25-4-4: Ferritic stainless steel type 25-4-4 (UNS S44635) with the composition limits of ASTM A959-11. Carbon up to 0.025% and chromium 24.5-26.0%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Mn
Mo
N
Ni
P
S
Si
<=0.025
24.5-26.0
<=1.00
3.5-4.5
<=0.035
3.5-4.5
<=0.040
<=0.030
<=0.75
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S44635
Metallurgical class
Ferritic grade: body-centered cubic, little or no tempered martensite, hardenable only slightly by cold working
Type
25-4-4 (common type number, not a trademark, widely used; not associated with any one product)
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)
Ti+Cb 0.20+4x (C+N)-0.80
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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