ASTM A959:2011 665: Precipitation hardening stainless steel type 665 (UNS S66545) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 12.0-15.0%.
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Chemical Composition (%)
Al
B
C
Cr
Cu
Mn
Mo
Ni
P
S
Si
Ti
<=0.25
0.01-0.07
<=0.08
12.0-15.0
<=0.25
1.25-2.00
1.25-2.25
24.0-28.0
<=0.040
<=0.030
0.10-0.80
2.7-3.3
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S66545
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
665 (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 2.7-3.3, Al 0.25, B 0.01-0.07
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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