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ASTM A959:2011 S21800 Steel: Specifications & Listings

ASTM A959:2011 S21800: Austenitic stainless steel grade (UNS S21800) with the composition limits of ASTM A959-11. Carbon up to 0.10% and chromium 16.0-18.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 S21800
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 S21800 ASTM A240/A240M:2025 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S21800 ASTM A240/A240M:2025 Strong Match
ASTM A276/A276M S21800 ASTM A276/A276M:2017 Strong Match
NF A35-574 Z7CN18-09 NF A35-574:1990 Related Material
IS 1570 (Part 5) X07Cr17 IS 1570 (Part 5):1985 Related Material
IS 1570 (Part 5) X07Cr18Ni9 IS 1570 (Part 5):1985 Related Material
IS 1570 (Part 5) X07Cr17Mn12Ni4 IS 1570 (Part 5):1985 Related Material
IS 1570 (Part 5) X10Cr17Mn6Ni4 IS 1570 (Part 5):1985 Related Material
IS 6911 X07Cr17 IS 6911:1992 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 N Ni P S Si
<=0.10 16.0-18.0 7.0-9.0 0.08-0.18 8.0-9.0 <=0.060 <=0.030 3.5-4.5

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S21800
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, 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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