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ASTM A959:2011 S43940 Steel: Specifications & Listings

ASTM A959:2011 S43940: Ferritic stainless steel grade (UNS S43940) with the composition limits of ASTM A959-11. Carbon up to 0.030% and chromium 17.5-18.5%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 S43940
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 S43940 ASTM A240/A240M:2025 USA No activity yet
EN 10088-1 X2CrTiNb18 EN 10088-1:2014 Europe (CEN) No activity yet
IS 6603 X02Cr18TiNb IS 6603:2024 India No activity yet
EN 10088-3 X2CrTiNb18 EN 10088-3:2014 Europe No activity yet
ASTM A240/A240M S43037 ASTM A240/A240M:2025 USA No activity yet
EN 10088-2 X3CrTi17 EN 10088-2:2014 Europe No activity yet
EN 10088-1 X2CrNbZr17 EN 10088-1:2023 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S43940 ASTM A240/A240M:2025 Strong Match
EN 10088-1 X2CrTiNb18 EN 10088-1:2014 Strong Match
EN 10088-1 X2CrTiNb18 EN 10088-1:2023 Strong Match
IS 6603 X02Cr18TiNb IS 6603:2024 Strong Match
EN 10088-3 X2CrTiNb18 EN 10088-3:2014 Strong Match
EN 10088-2 X2CrTiNb18 EN 10088-2:2014 Strong Match
ASTM A240/A240M S43037 ASTM A240/A240M:2025 Strong Match
EN 10088-2 X3CrTi17 EN 10088-2:2014 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 P S Si Ti
<=0.030 17.5-18.5 <=1.00 <=0.040 <=0.015 <=1.00 0.10-0.60

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S43940
Metallurgical class
Ferritic grade: body-centered cubic, little or no tempered martensite, hardenable only slightly 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
Other elements (as printed)
Ti 0.10-0.60, Cb 0.30+3xC 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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