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ASTM A240/A240M:2025 S31730 Steel: Specifications & Listings

ASTM A240/A240M:2025 S31730: S31730: austenitic (chromium-nickel or chromium-manganese-nickel) stainless steel plate, sheet and strip (UNS number, no type name printed). Specified in ASTM A240/A240M:2025.

Category: Stainless Steel
Grade Details
GradeASTM A240/A240M:2025 S31730
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 A276/A276M S31730 ASTM A276/A276M:2017 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A276/A276M S31730 ASTM A276/A276M:2017 Strong Match
EN 10088-1 X2CrNiMo18-15-4 EN 10088-1:2014 Close Alternative
EN 10088-1 X2CrNiMo18-15-4 EN 10088-1:2023 Close Alternative
ASTM A959 317L ASTM A959:2011 Close Alternative
EN 10088-1 X2CrNiMoN18-12-4 EN 10088-1:2014 Close Alternative
EN 10088-1 X2CrNiMoN18-12-4 EN 10088-1:2023 Close Alternative
EN 10088-1 X2CrNiMo18-14-3 EN 10088-1:2014 Close Alternative
EN 10088-1 X2CrNiMo18-14-3 EN 10088-1:2023 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 Mn P S Si Cr Ni Mo N Cu
<=0.030 <=2.00 <=0.040 <=0.010 <=1.00 17.0-19.0 15.0-16.5 3.0-4.0 <=0.045 4.0-5.0
Mechanical Properties
Tensile Strength >=480 MPa
Yield Strength >=175 MPa
Elongation >=35%
Hardness <=90 HRBW
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 (%)
All48017535
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
All-90 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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