BS 970 (Part 3):1991 230M07: 230M07 is a free-cutting 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
<=0.15
<=0.05
0.90-1.30
<=0.090
0.25-0.35
More data from BS 970 (Part 3):1991
From the standard
Other composition limits
Steel group
Free-cutting steel (Table 12)
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 12
Mechanical properties by heat treatment condition
Condition
Reference symbol
Size (mm)
Tensile strength Rm (MPa)
Yield Re, min (MPa)
Elongation, min (%)
Impact Izod, min (J)
Impact KCV, min (J)
Rp0.2, min (MPa)
Hardness HB
Notes
Hot rolled + turned or ground
≥ 6 < 100
360 min.
215
22
—
—
—
103 min.
Hot rolled + cold drawn or hot rolled + cold drawn + ground
≥ 6 ≤ 13
480 min.
400
6
—
—
360
—
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 13 ≤ 16
460 min.
380
7
—
—
345
—
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 16 ≤ 40
430 min.
340
8
—
—
300
—
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 40 ≤ 63
390 min.
280
9
—
—
240
—
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 63 ≤ 76
370 min.
240
10
—
—
225
—
Condition letters P to Z are the tensile strength ranges of Table 29. Rp0.2 applies when specifically ordered (note 3). Hardness HB is for guidance only except in the softened condition (note 13). Impact: Izod, or KCV when the standard impact test is not required (option A.3).
Source: BS 970 (Part 3):1991, Table 19
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