ASTM A959:2011 S45503: Precipitation hardening stainless steel grade (UNS S45503) with the composition limits of ASTM A959-11. Carbon up to 0.010% and chromium 11.0-12.5%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cb
Cr
Cu
Mn
Mo
Ni
P
S
Si
Ti
<=0.010
0.10-0.50
11.0-12.5
1.50-2.50
<=0.50
<=0.50
7.5-9.5
<=0.010
<=0.010
<=0.20
1.00-1.35
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S45503
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
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 1.50-2.50, Ti 1.00-1.35, Cb 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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