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ASTM A959:2011 XM-12 Steel: Specifications & Listings

ASTM A959:2011 XM-12: Precipitation hardening stainless steel type XM-12 (UNS S15500) with the composition limits of ASTM A959-11. Carbon up to 0.07% and chromium 14.0-15.5%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 XM-12
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 A959 630 ASTM A959:2011 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 630 ASTM A959:2011 Strong Match
JIS G4304 SUS630 JIS G4304:2021 Close Alternative
JIS G4305 SUS630 JIS G4305:2012 Close Alternative
ASTM A959 431 ASTM A959:2011 Close Alternative
ASTM A240/A240M S43100 ASTM A240/A240M:2025 Close Alternative
ASTM A276/A276M S43100 ASTM A276/A276M:2017 Close Alternative
ASTM A959 414 ASTM A959:2011 Close Alternative
ASTM A276/A276M S41400 ASTM A276/A276M:2017 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 Cb Cr Cu Mn Ni P S Si
<=0.07 0.15-0.45 14.0-15.5 2.5-4.5 <=1.00 3.5-5.5 <=0.040 <=0.030 <=1.00

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S15500
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
XM-12 (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 2.5-4.5, Cb 0.15-0.45
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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