ASTM A959:2011 S31266: Austenitic stainless steel grade (UNS S31266) with the composition limits of ASTM A959-11. Carbon up to 0.030% and chromium 23.0-25.0%.
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
23.0-25.0
1.00-2.50
2.0-4.0
5.2-6.2
0.35-0.60
21.0-24.0
<=0.035
<=0.020
<=1.00
1.50-2.50
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S31266
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, 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)
W 1.50-2.50
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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