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BS 970 (Part 1):1983 403S17 Steel: Specifications & Listings

BS 970 (Part 1):1983 403S17: 403S17 is a ferritic stainless steel grade specified in BS 970 Part 1:1983 (Table 13, category 1).

Category: Stainless Steel
Grade Details
GradeBS 970 (Part 1):1983 403S17
Standard BS 970 (Part 1):1983
ApplicationsStainless and heat resisting steel for mechanical and allied engineering purposes (Table 13).
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A959 405 ASTM A959:2011 USA No activity yet
ASTM A959 409 ASTM A959:2011 USA No activity yet
ASTM A959 409Cb ASTM A959:2011 USA No activity yet
BS 970 (Part 1) 403S17 BS 970 (Part 1):1991 UK No activity yet
IS 6603 X04Cr12 IS 6603:2024 India No activity yet
ASTM A240/A240M S41008 ASTM A240/A240M:2025 USA No activity yet
JIS G4304 SUS410S JIS G4304:2021 Japan No activity yet
ASTM A276/A276M S40500 ASTM A276/A276M:2017 USA No activity yet
JIS G4304 SUS405 JIS G4304:2021 Japan No activity yet
ASTM A240/A240M S40300 ASTM A240/A240M:2025 USA No activity yet
JIS G4304 SUS403 JIS G4304:2021 Japan No activity yet
JIS G4304 SUS410 JIS G4304:2021 Japan No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 403S17 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 3) 403S17 BS 970 (Part 3):1991 Strong Match
IS 6603 X04Cr12 IS 6603:2024 Strong Match
ASTM A240/A240M S41008 ASTM A240/A240M:2025 Strong Match
JIS G4304 SUS410S JIS G4304:2021 Strong Match
JIS G4305 SUS410S JIS G4305:2012 Strong Match
ASTM A959 405 ASTM A959:2011 Strong Match
ASTM A276/A276M S40500 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 Si Mn P S Cr Ni
<=0.08 <=1.0 <=1.0 <=0.040 <=0.030 12.0-14.0 <=0.50

More data from BS 970 (Part 1):1983

From the standard
Mechanical properties by heat treatment condition
ConditionLimiting ruling section (mm)Heat treatmentRm (N/mm2)Re min (N/mm2)A min (%)Izod min (ft lbf)KCV min (J)Rp0.2 min (N/mm2), when specifically orderedHB
Not lettered150Anneal 700-780 deg C, air cooled or furnace cooled (note 31)420 min28020--245170 max
All Table 13 steels are category 1. Rp0.2 applies when specifically ordered (note 10). 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1983, Table 13
Hardness, softened condition
Hardness HB, softened condition
170 max
Source: BS 970 (Part 1):1983, Table 13
Comparison with earlier editions
BS 970:1970/72 designation
403S17
BS 970:1955 En No.
None
Appendix D note 47: where a comparison is made the steels are not necessarily equivalent. 'Not listed' means the earlier edition has no entry under this designation.
Source: BS 970 (Part 1):1983, Appendix D

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