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ASTM A959:2011 309Cb Steel: Specifications & Listings

ASTM A959:2011 309Cb: Austenitic stainless steel type 309Cb (UNS S30940) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 22.0-24.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 309Cb
Standard ASTM A959:2011
ApplicationsWrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A276/A276M S30908 ASTM A276/A276M:2017 USA No activity yet
JIS G4304 SUS309S JIS G4304:2021 Japan No activity yet
ASTM A276/A276M S30940 ASTM A276/A276M:2017 USA No activity yet
ASTM A276/A276M S30900 ASTM A276/A276M:2017 USA No activity yet
ASTM A240/A240M S30909 ASTM A240/A240M:2025 USA No activity yet
ASTM A240/A240M S30941 ASTM A240/A240M:2025 USA No activity yet
EN 10088-1 X12CrNi23-13 EN 10088-1:2014 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 309S ASTM A959:2011 Strong Match
ASTM A276/A276M S30908 ASTM A276/A276M:2017 Strong Match
JIS G4304 SUS309S JIS G4304:2021 Strong Match
JIS G4305 SUS309S JIS G4305:2012 Strong Match
ASTM A240/A240M S30908 ASTM A240/A240M:2025 Strong Match
ASTM A959 309HCb ASTM A959:2011 Strong Match
ASTM A276/A276M S30940 ASTM A276/A276M:2017 Strong Match
ASTM A240/A240M S30940 ASTM A240/A240M:2025 Strong Match
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Cr Mn Ni P S Si
<=0.08 22.0-24.0 <=2.00 12.0-16.0 <=0.045 <=0.030 <=1.00

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S30940
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
309Cb (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 10xC-1.10
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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