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BS 970 (Part 3):1991 403S17 Steel: Specifications & Listings

BS 970 (Part 3):1991 403S17: 403S17 is a stainless steel bright bar grade specified in BS 970 Part 3:1991 (bright bars for general engineering purposes).

Category: Stainless Steel
Grade Details
GradeBS 970 (Part 3):1991 403S17
Standard BS 970 (Part 3):1991
ApplicationsBright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; ferritic stainless steel (Table 17)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A959 405 ASTM A959:2011 USA No activity yet
ASTM A959 S40800 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 SUS429 JIS G4304:2021 Japan 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 1) 403S17 BS 970 (Part 1):1983 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 3):1991

From the standard
Other composition limits
Steel group
Ferritic stainless steel (Table 17)
Condition of supply
Bright bars: cold drawn, turned or precision ground, in straight lengths
Maximum unless a range is stated.
Source: BS 970 (Part 3):1991, Table 17
Heat treatment and mechanical properties
Heat treatment conditionLimiting ruling section (mm)Tempering or heat treatment (deg C)Tensile strength Rm (MPa)Yield Re, min (MPa)Elongation, min (%)Impact Izod, min (J)Impact KCV, min (J)Rp0.2, min (MPa)Hardness HB
150700-780 (air cooled or furnace cooled)420 min.28020——245170 max.
Condition letters P to T are the tensile strength ranges of Table 29. Rp0.2 applies when specifically ordered (note 3). Bars of ferritic steel in the hardened and tempered condition are heat treated before or after cold sizing (clause 4.3.1). See also option A.3.
Source: BS 970 (Part 3):1991, Table 23
Hardness in the softened condition
Softened condition, max
170 HB
Table 23, softened condition.
Source: BS 970 (Part 3):1991, Table 23

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