Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
Al
C
Cb
Cr
Cu
Mn
Mo
N
Ni
P
S
Si
Sn
Ti
W
<=0.025
0.10-0.15
<=0.20
11.5-13.0
<=0.15
0.25-0.80
<=0.50
<=0.08
<=0.75
<=0.018
<=0.015
<=0.50
<=0.05
<=0.15
<=0.10
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S41005
Metallurgical class
Martensitic grade: can be hardened by heat treating and quenching and then tempered; delivered annealed or hardened and tempered
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 0.10, Al 0.025, Cb 0.20, Ti 0.15, Sn 0.05
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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