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ASTM A959:2011 348H Steel: Specifications & Listings

ASTM A959:2011 348H: Austenitic stainless steel type 348H (UNS S34809) with the composition limits of ASTM A959-11. Carbon 0.04-0.10% and chromium 17.0-19.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 348H
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
IS 1570 (Part 7) 7Cr18Ni10H IS 1570 (Part 7):1992 India No activity yet
IS 1570 (Part 7) 7Cr18Ni11NbH IS 1570 (Part 7):1992 India No activity yet
ASTM A240/A240M S34809 ASTM A240/A240M:2025 USA No activity yet
EN 10088-1 X7CrNiNb18-10 EN 10088-1:2014 Europe (CEN) No activity yet
ASTM A240/A240M S34800 ASTM A240/A240M:2025 USA No activity yet
EN 10088-1 X8CrNiTi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
IS 1570 (Part 5) X04Cr18Ni10Ti IS 1570 (Part 5):1985 India No activity yet
ASTM A240/A240M S32109 ASTM A240/A240M:2025 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S34809 ASTM A240/A240M:2025 Strong Match
ASTM A959 347H ASTM A959:2011 Strong Match
ASTM A959 348 ASTM A959:2011 Strong Match
EN 10088-1 X7CrNiNb18-10 EN 10088-1:2014 Strong Match
EN 10088-1 X7CrNiNb18-10 EN 10088-1:2023 Strong Match
ASTM A959 321H ASTM A959:2011 Strong Match
IS 1570 (Part 7) 7Cr18Ni11NbH IS 1570 (Part 7):1992 Strong Match
ASTM A240/A240M S34800 ASTM A240/A240M:2025 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 Co Cr Mn Ni P S Si Ta
0.04-0.10 <=0.20 17.0-19.0 <=2.00 9.0-12.0 <=0.045 <=0.030 <=1.00 <=0.10

More data from ASTM A959:2011

From the standard
Other composition limits from Table 1 and its footnotes
UNS number
S34809
Metallurgical class
Austenitic grade: usually predominantly face-centered cubic, hardenable only by cold working
Type
348H (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
Other elements (as printed)
Cb+Ta 8xC-1.10, Ta 0.10, Co 0.20
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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