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ASTM A959:2011 S32101 Steel: Specifications & Listings

ASTM A959:2011 S32101: Duplex (austenitic-ferritic) stainless steel grade (UNS S32101) with the composition limits of ASTM A959-11. Carbon up to 0.040% and chromium 21.0-22.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 S32101
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 S32101 ASTM A240/A240M:2025 USA No activity yet
IS 6603 X02Cr21Mn5Ni1N IS 6603:2024 India No activity yet
EN 10088-1 X2CrMnNiN21-5-1 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X2CrMnNiN21-5-1 EN 10088-3:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S32101 ASTM A240/A240M:2025 Strong Match
ASTM A276/A276M S32101 ASTM A276/A276M:2017 Strong Match
IS 6603 X02Cr21Mn5Ni1N IS 6603:2024 Strong Match
EN 10088-1 X2CrMnNiN21-5-1 EN 10088-1:2014 Strong Match
EN 10088-1 X2CrMnNiN21-5-1 EN 10088-1:2023 Strong Match
EN 10088-3 X2CrMnNiN21-5-1 EN 10088-3:2014 Strong Match
EN 10088-2 X2CrMnNiN21-5-1 EN 10088-2:2014 Strong Match
ASTM A959 S32001 ASTM A959:2011 Close Alternative
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Cr Cu Mn Mo N Ni P S Si
<=0.040 21.0-22.0 0.10-0.80 4.0-6.0 0.10-0.80 0.20-0.25 1.35-1.70 <=0.040 <=0.030 <=1.00

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S32101
Metallurgical class
Austenitic-ferritic (duplex) grade: a mixture of austenitic and ferritic structures, hardenable only by cold working
Type
No type number is printed; the grade is identified by its UNS number only
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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