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ASTM A959:2011 303Se Steel: Specifications & Listings

ASTM A959:2011 303Se: Austenitic stainless steel type 303Se (UNS S30323) with the composition limits of ASTM A959-11. Carbon up to 0.15% and chromium 17.0-19.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 303Se
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) X07Cr18Ni9 IS 1570 (Part 5):1985 India No activity yet
BS 970 (Part 3) 303S42 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 302S31 BS 970 (Part 1):1991 UK No activity yet
EN 10088-1 X9CrNi18-9 EN 10088-1:2014 Europe (CEN) No activity yet
BS 970 (Part 1) 325S31 BS 970 (Part 1):1991 UK No activity yet
BS 970 (Part 3) 303S31 BS 970 (Part 3):1991 UK No activity yet
BS 970 EN58A BS 970:1955 UK No activity yet
BS 970 EN58B BS 970:1955 UK No activity yet
BS 970 EN58F BS 970:1955 UK No activity yet
ASTM A240/A240M S30200 ASTM A240/A240M:2025 USA No activity yet
EN 10088-3 X9CrNi18-9 EN 10088-3:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 303 ASTM A959:2011 Strong Match
IS 1570 (Part 5) X07Cr18Ni9 IS 1570 (Part 5):1985 Strong Match
IS 6911 X07Cr18Ni9 IS 6911:1992 Strong Match
BS 970 (Part 3) 303S42 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 302S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 3) 302S31 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 302S31 BS 970 (Part 1):1983 Strong Match
EN 10088-1 X9CrNi18-9 EN 10088-1:2014 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 Ni P S Se Si
<=0.15 17.0-19.0 <=2.00 8.0-10.0 <=0.20 <=0.06 >=0.15 <=1.00

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S30323
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
303Se (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)
Se 0.15 min
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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