Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
P
S
<=0.15
0.90-1.30
<=0.070
0.20-0.30
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Silicon
Not specified; a maximum silicon content can be agreed between purchaser and supplier (Table 2, note 5)
Phosphorus
0.070 max; higher phosphorus contents or ranges can be supplied by agreement (Table 2, note 6)
Phosphorus (note 6)
Higher phosphorus contents or ranges, for example 0.040% to 0.090% or 0.070% to 0.120%, can be supplied by agreement between the purchaser and the supplier
Sulphur 0.20-0.30 gives the free cutting property.
Source: BS 970 (Part 1):1983, Table 2
As rolled or normalized properties
Limiting ruling section (mm)
100
Rm min (N/mm2)
360
Re min (N/mm2)
215
A min (%)
22
HB min
103
Table 2, page 15.
Source: BS 970 (Part 1):1983, Table 2
Mechanical properties, bright bar
Condition
Heat treatment condition
Size, diameter or across flats (mm)
Rm (N/mm2)
Re min (N/mm2)
A min (%)
Izod min (ft lbf)
KCV min (J)
Rp0.2 min (N/mm2), when specifically ordered
HB
Hot rolled + turned or ground
-
6 to 100
360 min
215
22
-
-
-
103 min
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
6 to 13
480 min
400
6
-
-
360
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 13 to 16
460 min
380
7
-
-
345
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 16 to 40
430 min
340
8
-
-
300
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 40 to 63
390 min
280
9
-
-
240
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 63 to 76
370 min
240
10
-
-
225
-
Size is the diameter or across flats. For cold drawn bar of 6 mm or less, all mechanical properties are subject to agreement between purchaser and supplier at the time of enquiry and order (note 8). For normalizing and hardening and tempering treatments see Tables 3 and 7 (note 9). Rp0.2 applies when specifically ordered (note 10). 1 N/mm2 = 1 MPa.
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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