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ASTM A959:2011 XM-1 Steel: Specifications & Listings

ASTM A959:2011 XM-1: Austenitic stainless steel type XM-1 (UNS S20300) with the composition limits of ASTM A959-11. Carbon up to 0.08% and chromium 16.0-18.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 XM-1
Standard ASTM A959:2011
ApplicationsWrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
IS 1570 (Part 5) X10Cr17Mn6Ni4 IS 1570 (Part 5):1985 Close Alternative
JIS G4304 SUS304J2 JIS G4304:2021 Close Alternative
JIS G4305 SUS304J2 JIS G4305:2012 Close Alternative
ASTM A959 201 ASTM A959:2011 Close Alternative
ASTM A240/A240M S20100 ASTM A240/A240M:2025 Close Alternative
ASTM A240/A240M S20433 ASTM A240/A240M:2025 Close Alternative
ASTM A276/A276M S20100 ASTM A276/A276M:2017 Close Alternative
EN 10088-1 X9CrMnNiCu17-8-5-2 EN 10088-1:2014 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 Ni P S Si
<=0.08 16.0-18.0 1.75-2.25 5.0-6.5 5.0-6.5 <=0.045 0.18-0.35 <=1.00

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S20300
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
XM-1 (numbering system developed and applied by ASTM)
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)
Cu 1.75-2.25
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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