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ASTM A240/A240M:2025 S34809 Steel: Specifications & Listings

ASTM A240/A240M:2025 S34809: S34809 (type 348H): austenitic (chromium-nickel or chromium-manganese-nickel) stainless steel plate, sheet and strip (UNS S34809). Specified in ASTM A240/A240M:2025. Combined limit (percent): Nb + Ta at most 1.00.

Category: Stainless Steel
Grade Details
GradeASTM A240/A240M:2025 S34809
Standard ASTM A240/A240M:2025
ApplicationsPressure vessels and general applications (plate, sheet and strip)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A959 348H ASTM A959:2011 USA No activity yet
ASTM A959 347H ASTM A959:2011 USA No activity yet
ASTM A959 348 ASTM A959:2011 USA No activity yet
EN 10088-1 X7CrNiNb18-10 EN 10088-1:2014 Europe (CEN) No activity yet
ASTM A276/A276M S34800 ASTM A276/A276M:2017 USA No activity yet
ASTM A276/A276M S30500 ASTM A276/A276M:2017 USA No activity yet
ASTM A959 321H ASTM A959:2011 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A240/A240M S34800 ASTM A240/A240M:2025 Strong Match
ASTM A959 348H ASTM A959:2011 Strong Match
ASTM A240/A240M S34709 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 A276/A276M S34800 ASTM A276/A276M:2017 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 Mn P S Si Cr Ni Ta Co
0.04-0.10 <=2.00 <=0.045 <=0.030 <=0.75 17.0-19.0 9.0-13.0 <=0.10 <=0.20
Mechanical Properties
Tensile Strength >=515 MPa
Yield Strength >=205 MPa
Elongation >=40%
Hardness <=201 HB
Condition Plate, sheet and strip; yield by 0.2 percent offset

More data from ASTM A240/A240M:2025

From the standard
Mechanical properties 1 condition(s)
Product or thicknessTensile strength, min (MPa)Yield strength, min (MPa)Elongation in 50 mm, min (%)
All51520540
Minimum values; yield strength by the 0.2 percent offset method.
Source: ASTM A240/A240M:2025, Table 2
Hardness 1 condition(s)
Product or thicknessBrinell HBW, maxRockwell, max
All20192 HRBW
Maximum values; either Brinell or Rockwell scale may be used.
Source: ASTM A240/A240M:2025, Table 2
Cold bend 1 value
Cold bend angle
not required
Bend tests are not required for chromium steels thicker than 1 in. [25 mm] or for any austenitic or duplex steel regardless of thickness.
Source: ASTM A240/A240M:2025, Table 2

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