ASTM A959:2011 622: Austenitic stainless steel type 622 (UNS S66220) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 12.0-15.0%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
Al
B
C
Cr
Cu
Mn
Mo
Ni
P
S
Si
Ti
<=0.35
0.001-0.010
<=0.08
12.0-15.0
<=0.50
<=1.50
2.5-3.5
24.0-28.0
<=0.040
<=0.030
<=1.00
1.55-2.00
More data from ASTM A959:2011
From the standard
Other composition limitsfrom Table 1 and its footnotes
UNS number
S66220
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
622 (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 0.50, Ti 1.55-2.00, Al 0.35, B 0.001-0.010
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. UNS S66220 is printed under Austenitic grades and again under Precipitation hardening grades with different limits and type numbers; loaded as two grades.
Source: ASTM A959:2011, Table 1 and its footnotes
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