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ASTM A959:2011 434 Steel: Specifications & Listings

ASTM A959:2011 434: Ferritic stainless steel type 434 (UNS S43400) with the composition limits of ASTM A959-11. Carbon up to 0.12% and chromium 16.0-18.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 434
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 S43400 ASTM A240/A240M:2025 USA No activity yet
IS 11169 (Part 2) X04Cr17Mo1 IS 11169 (Part 2):2023 India No activity yet
ASTM A240/A240M S43600 ASTM A240/A240M:2025 USA No activity yet
EN 10088-3 X6CrMo17-1 EN 10088-3:2014 Europe No activity yet
EN 10088-1 X6CrMoNb17-1 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X6CrMo17-1 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X6CrMoNb17-1 EN 10088-3:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 436 ASTM A959:2011 Strong Match
ASTM A240/A240M S43400 ASTM A240/A240M:2025 Strong Match
IS 11169 (Part 2) X04Cr17Mo1 IS 11169 (Part 2):2023 Strong Match
ASTM A240/A240M S43600 ASTM A240/A240M:2025 Strong Match
IS 6603 X04Cr17Mo1 IS 6603:2024 Strong Match
EN 10088-3 X6CrMo17-1 EN 10088-3:2014 Strong Match
EN 10088-1 X6CrMoNb17-1 EN 10088-1:2014 Strong Match
EN 10088-1 X6CrMoNb17-1 EN 10088-1:2023 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 Mo P S Si
<=0.12 16.0-18.0 <=1.00 0.75-1.25 <=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
S43400
Metallurgical class
Ferritic grade: body-centered cubic, little or no tempered martensite, hardenable only slightly by cold working
Type
434 (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
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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