ASTM A959:2011 635: Precipitation hardening stainless steel type 635 (UNS S17600) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 16.0-17.5%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
Al
C
Cr
Mn
Ni
P
S
Si
Ti
<=0.40
<=0.08
16.0-17.5
<=1.00
6.0-7.5
<=0.040
<=0.030
<=1.00
0.40-1.20
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S17600
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
635 (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)
Al 0.40, Ti 0.40-1.20
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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