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ASTM A240/A240M:2025 S43100 Steel: Specifications & Listings

ASTM A240/A240M:2025 S43100: S43100 (type 431): ferritic or martensitic (chromium) stainless steel plate, sheet and strip (UNS S43100). Specified in ASTM A240/A240M:2025.

Category: Stainless Steel
Grade Details
GradeASTM A240/A240M:2025 S43100
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 431 ASTM A959:2011 USA No activity yet
BS 970 (Part 1) 431S29 BS 970 (Part 1):1991 UK No activity yet
ASTM A276/A276M S43100 ASTM A276/A276M:2017 USA No activity yet
IS 1570 (Part 5) X15Cr16Ni2 IS 1570 (Part 5):1985 India No activity yet
EN 10088-1 X17CrNi16-2 EN 10088-1:2014 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 431 ASTM A959:2011 Strong Match
ASTM A276/A276M S43100 ASTM A276/A276M:2017 Strong Match
IS 1570 (Part 5) X15Cr16Ni2 IS 1570 (Part 5):1985 Strong Match
EN 10088-1 X17CrNi16-2 EN 10088-1:2014 Strong Match
EN 10088-1 X17CrNi16-2 EN 10088-1:2023 Strong Match
BS 970 (Part 1) 431S29 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 3) 431S29 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 431S29 BS 970 (Part 1):1983 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
<=0.20 <=1.00 <=0.040 <=0.030 <=1.00 15.0-17.0 1.25-2.50
Mechanical Properties
Hardness <=285 HB
Condition Plate, sheet and strip; yield by 0.2 percent offset

More data from ASTM A240/A240M:2025

From the standard
Hardness 1 condition(s)
Product or thicknessBrinell HBW, maxRockwell, max
All28529 HRC
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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