BS 970 (Part 3):1991 430S17: 430S17 is a stainless steel bright bar grade specified in BS 970 Part 3:1991 (bright bars for general engineering purposes).
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
16.0-18.0
<=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 condition
Limiting 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
63
750-820 (cooled freely in air)
430 min.
280
20
—
—
245
170 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
Active BS 970 (Part 3):1991 430S17 Listings on M-EX (For Sale)