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ASTM A959:2011 XM-21 Steel: Specifications & Listings

ASTM A959:2011 XM-21: Austenitic stainless steel type XM-21 (UNS S30452) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 18.0-20.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 XM-21
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
SAE 30304 SAE J405 USA 2 listings, 0 RFQs →
GB/T 3280 06Cr19Ni10 GB/T 3280-2015 China 2 listings, 0 RFQs →
ASTM A276/A276M S30452 ASTM A276/A276M:2017 USA No activity yet
IS 6603 X05Cr19Ni9N IS 6603:2024 India No activity yet
KS D3566 STS304 KS D3566:2021 Korea 0 listings, 2 RFQs →
IS 6911 X04Cr19Ni9 IS 6911:1992 India 2 listings, 0 RFQs →
JIS G4304 SUS304 JIS G4304:2021 Japan No activity yet
JIS G4304 SUS304N1 JIS G4304:2021 Japan No activity yet
ASTM A240/A240M S30451 ASTM A240/A240M:2025 USA No activity yet
EN 10088-1 X5CrNiN19-9 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X5CrNiN19-9 EN 10088-3:2014 Europe No activity yet
JIS G4304 SUS304Cu JIS G4304:2021 Japan No activity yet
JIS G4304 SUS304N2 JIS G4304:2021 Japan No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A276/A276M S30452 ASTM A276/A276M:2017 Strong Match
ASTM A240/A240M S30452 ASTM A240/A240M:2025 Strong Match
IS 6603 X05Cr19Ni9N IS 6603:2024 Strong Match
KS D3566 STS304 KS D3566:2021 Strong Match
IS 6911 X04Cr19Ni9 IS 6911:1992 Strong Match
JIS G4304 SUS304 JIS G4304:2021 Strong Match
JIS G4305 SUS304 JIS G4305:2012 Strong Match
JIS G4304 SUS304N1 JIS G4304:2021 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 N Ni P S Si
<=0.08 18.0-20.0 <=2.00 0.16-0.30 8.0-10.0 <=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
S30452
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
XM-21 (numbering system developed and applied by ASTM)
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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