ASTM A959:2011 634: Precipitation hardening stainless steel type 634 (UNS S35500) with the composition limits of ASTM A959-11. Carbon 0.10-0.15% and chromium 15.0-16.0%.
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
Mn
Mo
N
Ni
P
S
Si
0.10-0.15
0.10-0.50
15.0-16.0
0.50-1.25
2.5-3.2
0.07-0.13
4.0-5.0
<=0.040
<=0.030
<=0.50
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S35500
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
634 (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)
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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