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
0.22-0.30
0.50-0.90
<=0.050
<=0.050
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Silicon
Not specified for this grade; a maximum silicon content can be agreed between purchaser and supplier (Table 2, note 5)
Phosphorus and sulphur
Each 0.050 max (clause 1.7.2.1, carbon and carbon manganese steels)
Values as printed in Table 2 for the limiting ruling section shown.
Source: BS 970 (Part 1):1983, Table 2 and Table 3
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
Normalized + turned or ground
-
6 to 63
490 min
245
20
-
-
-
143-192 (note 4)
Normalized + turned or ground
-
over 63 to 250
430 min
215
20
-
-
-
126-179 (note 4)
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
6 to 13
590 min
465
9
-
-
440
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 13 to 16
570 min
440
11
-
-
420
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 16 to 40
540 min
400
12
-
-
380
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 40 to 63
530 min
385
12
-
-
330
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 63 to 76
490 min
355
13
-
-
310
-
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. Hardness values marked note 4 are for guidance only.
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
Normalizing temperature
Normalizing temperature (C)
870-900
Table 3, category 1.
Source: BS 970 (Part 1):1983, Table 3
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