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ASTM A959:2011 631 Steel: Specifications & Listings

ASTM A959:2011 631: Precipitation hardening stainless steel type 631 (UNS S17700) with the composition limits of ASTM A959-11. Carbon up to 0.09% and chromium 16.0-18.0%.

Category: Stainless Steel
Grade Details
GradeASTM A959:2011 631
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 6911 X10Cr17Ni7 IS 6911:1992 India No activity yet
ASTM A959 635 ASTM A959:2011 USA No activity yet
JIS G4304 SUS631 JIS G4304:2021 Japan No activity yet
IS 6603 X07Cr17Ni7Al IS 6603:2024 India No activity yet
EN 10088-1 X7CrNiAl17-7 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X7CrNiAl17-7 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X5CrNi17-7 EN 10088-3:2014 Europe No activity yet
JIS G4304 SUS301 JIS G4304:2021 Japan No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
JIS G4304 SUS631 JIS G4304:2021 Strong Match
JIS G4305 SUS631 JIS G4305:2012 Strong Match
IS 6603 X07Cr17Ni7Al IS 6603:2024 Strong Match
EN 10088-1 X7CrNiAl17-7 EN 10088-1:2014 Strong Match
EN 10088-1 X7CrNiAl17-7 EN 10088-1:2023 Strong Match
EN 10088-3 X7CrNiAl17-7 EN 10088-3:2014 Strong Match
EN 10088-2 X7CrNiAl17-7 EN 10088-2:2014 Strong Match
IS 6911 X10Cr17Ni7 IS 6911:1992 Strong Match
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
Al C Cr Mn Ni P S Si
0.75-1.50 <=0.09 16.0-18.0 <=1.00 6.5-7.7 <=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
S17700
Metallurgical class
Precipitation hardening grade: basically austenitic or martensitic, hardenable by precipitation (age) hardening
Type
631 (common type number, not a trademark, widely used; not associated with any one product)
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)
Al 0.75-1.50
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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