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ASTM A959:2011 309H Steel: Specifications & Listings

ASTM A959:2011 309H: Austenitic stainless steel type 309H (UNS S30909) with the composition limits of ASTM A959-11. Carbon 0.04-0.10% and chromium 22.0-24.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 309H
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 A240/A240M S30909 ASTM A240/A240M:2025 USA No activity yet
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 S30900 ASTM A276/A276M:2017 USA No activity yet
ASTM A240/A240M S30941 ASTM A240/A240M:2025 USA No activity yet
EN 10088-1 X6CrNi23-13 EN 10088-1:2014 Europe (CEN) No activity yet
ASTM A240/A240M S30940 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 A240/A240M S30909 ASTM A240/A240M:2025 Strong Match
ASTM A959 309HCb ASTM A959:2011 Strong 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 A959 309 ASTM A959:2011 Strong Match
ASTM A276/A276M S30900 ASTM A276/A276M:2017 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
0.04-0.10 22.0-24.0 <=2.00 12.0-15.0 <=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
S30909
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
309H (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
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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