ASTM A959:2011 630: Precipitation hardening stainless steel type 630 (UNS S17400) with the composition limits of ASTM A959-11. Carbon up to 0.07% and chromium 15.0-17.0%.
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
Cu
Mn
Ni
P
S
Si
<=0.07
0.15-0.45
15.0-17.0
3.0-5.0
<=1.00
3.0-5.0
<=0.040
<=0.030
<=1.00
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S17400
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
630 (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)
Cu 3.0-5.0, Cb 0.15-0.45
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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