ASTM A959:2011 S31260: Duplex (austenitic-ferritic) stainless steel grade (UNS S31260) with the composition limits of ASTM A959-11. Carbon up to 0.030% and chromium 24.0-26.0%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Cu
Mn
Mo
N
Ni
P
S
Si
W
<=0.030
24.0-26.0
0.20-0.80
<=1.00
2.5-3.5
0.10-0.30
5.5-7.5
<=0.030
<=0.030
<=0.75
0.10-0.50
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S31260
Metallurgical class
Austenitic-ferritic (duplex) grade: a mixture of austenitic and ferritic structures, hardenable only by cold working
Type
No type number is printed; the grade is identified by its UNS number only
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 0.20-0.80, W 0.10-0.50
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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