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ASTM A959:2011 S31200 Steel: Specifications & Listings

ASTM A959:2011 S31200: Duplex (austenitic-ferritic) stainless steel grade (UNS S31200) with the composition limits of ASTM A959-11. Carbon up to 0.030% and chromium 24.0-26.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 S31200
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 S31200 ASTM A240/A240M:2025 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S31200 ASTM A240/A240M:2025 Strong Match
ASTM A240/A240M S82561 ASTM A240/A240M:2025 Close Alternative
EN 10088-3 X3CrNiMoN27-5-2 EN 10088-3:2014 Close Alternative
IS 6603 X03Cr27Ni5Mo2N IS 6603:2024 Close Alternative
EN 10088-1 X3CrNiMoN27-5-2 EN 10088-1:2014 Close Alternative
EN 10088-1 X3CrNiMoN27-5-2 EN 10088-1:2023 Close Alternative
ASTM A959 S32950 ASTM A959:2011 Close Alternative
ASTM A240/A240M S32950 ASTM A240/A240M:2025 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 Mn Mo N Ni P S Si
<=0.030 24.0-26.0 <=2.00 1.20-2.00 0.14-0.20 5.5-6.5 <=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
S31200
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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