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ASTM A959:2011 321 Steel: Specifications & Listings

ASTM A959:2011 321: Austenitic stainless steel type 321 (UNS S32100) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 17.0-19.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 321
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
IS 1570 (Part 5) X04Cr18Ni10Ti IS 1570 (Part 5):1985 India No activity yet
IS 1570 (Part 5) X04Cr18Ni10Nb IS 1570 (Part 5):1985 India No activity yet
BS 970 (Part 1) 321S31 BS 970 (Part 1):1991 UK No activity yet
BS 970 (Part 1) 347S31 BS 970 (Part 1):1991 UK No activity yet
BS 970 (Part 1) 304S31 BS 970 (Part 1):1991 UK No activity yet
ASTM A240/A240M S32100 ASTM A240/A240M:2025 USA No activity yet
IS 6603 X04Cr19Ni9 IS 6603:2024 India No activity yet
IS 6603 X04Cr18Ni12 IS 6603:2024 India No activity yet
EN 10088-1 X4CrNi18-12 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X6CrNi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X7CrNiTi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X5CrNi18-10 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X6CrNiTi18-10 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X4CrNi18-12 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X6CrNiNb18-10 EN 10088-3:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
IS 1570 (Part 5) X04Cr18Ni10Ti IS 1570 (Part 5):1985 Strong Match
IS 1570 (Part 5) X04Cr18Ni10Nb IS 1570 (Part 5):1985 Strong Match
IS 11169 (Part 2) X04Cr18Ni10Ti IS 11169 (Part 2):1989 Strong Match
IS 6911 X04Cr18Ni10Ti IS 6911:1992 Strong Match
IS 6911 X04Cr18Ni10Nb IS 6911:1992 Strong Match
ASTM A959 347 ASTM A959:2011 Strong Match
BS 970 (Part 1) 321S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 1) 347S31 BS 970 (Part 1):1991 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 17.0-19.0 <=2.00 <=0.10 9.0-12.0 <=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
S32100
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
321 (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
Other elements (as printed)
Ti 5x(C+N)-0.70
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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