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ASTM A959:2011 329 Steel: Specifications & Listings

ASTM A959:2011 329: Duplex (austenitic-ferritic) stainless steel type 329 (UNS S32900) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 23.0-28.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 329
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 S32900 ASTM A240/A240M:2025 USA No activity yet
JIS G4304 SUS329J1 JIS G4304:2021 Japan No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S32900 ASTM A240/A240M:2025 Strong Match
JIS G4304 SUS329J1 JIS G4304:2021 Strong Match
JIS G4305 SUS329J1 JIS G4305:2012 Strong Match
ASTM A959 SS316 ASTM A959:2011 Related Material
IS 1570 (Part 5) X04Cr17Ni12Mo2 IS 1570 (Part 5):1985 Related Material
IS 1570 (Part 5) X04Cr19Ni13Mo3 IS 1570 (Part 5):1985 Related Material
IS 1570 (Part 7) 6Cr17Ni12Mo2H IS 1570 (Part 7):1992 Related Material
IS 11169 (Part 2) X04Cr17Ni12Mo2 IS 11169 (Part 2):1989 Related Material
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 Mo Ni P S Si
<=0.08 23.0-28.0 <=1.00 1.00-2.00 2.5-5.0 <=0.040 <=0.030 <=0.75

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S32900
Metallurgical class
Austenitic-ferritic (duplex) grade: a mixture of austenitic and ferritic structures, hardenable only by cold working
Type
329 (designation originally assigned by the American Iron and Steel Institute)
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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