ASTM A959:2011 660: Precipitation hardening stainless steel type 660 (UNS S66286) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 13.5-16.0%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
Al
B
C
Cr
Mn
Mo
Ni
P
S
Si
Ti
V
<=0.35
0.001-0.010
<=0.08
13.5-16.0
<=2.00
1.00-1.50
24.0-27.0
<=0.040
<=0.030
<=1.00
1.90-2.35
0.10-0.50
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S66286
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
660 (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 1.90-2.35, Al 0.35, V 0.10-0.50, B 0.001-0.010
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. UNS S66286 is printed under Austenitic grades and again under Precipitation hardening grades with different limits and type numbers; loaded as two grades.
Source: ASTM A959:2011, Table 1 and its footnotes
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