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ASTM A959:2011 440B Steel: Specifications & Listings

ASTM A959:2011 440B: Martensitic stainless steel type 440B (UNS S44003) with the composition limits of ASTM A959-11. Carbon 0.75-0.95% and chromium 16.0-18.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 440B
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 A959 440A ASTM A959:2011 USA No activity yet
ASTM A276/A276M S44003 ASTM A276/A276M:2017 USA No activity yet
ASTM A276/A276M S44002 ASTM A276/A276M:2017 USA No activity yet
ASTM A276/A276M S44004 ASTM A276/A276M:2017 USA No activity yet
EN 10088-3 X105CrMo17 EN 10088-3:2014 Europe No activity yet
EN 10088-1 X105CrMo17 EN 10088-1:2014 Europe (CEN) No activity yet
ASTM A959 440C ASTM A959:2011 USA No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A276/A276M S44003 ASTM A276/A276M:2017 Strong Match
ASTM A959 440A ASTM A959:2011 Strong Match
ASTM A959 440C ASTM A959:2011 Strong Match
ASTM A276/A276M S44002 ASTM A276/A276M:2017 Strong Match
ASTM A276/A276M S44004 ASTM A276/A276M:2017 Strong Match
EN 10088-3 X105CrMo17 EN 10088-3:2014 Strong Match
EN 10088-1 X105CrMo17 EN 10088-1:2014 Strong Match
EN 10088-1 X105CrMo17 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
0.75-0.95 16.0-18.0 <=1.00 <=0.75 <=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
S44003
Metallurgical class
Martensitic grade: can be hardened by heat treating and quenching and then tempered; delivered annealed or hardened and tempered
Type
440B (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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