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
0.12-0.18
0.60-1.00
<=0.050
<=0.050
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Phosphorus and sulphur
Each 0.050 max (clause 1.7.2.1, carbon and carbon manganese steels)
Values as printed in Table 11 for the test bar diameter shown. 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1983, Table 11
Heat treatment and maximum hardness
Hardening temperature
900-930 deg C
Table 12 gives no maximum hardness for this steel.
Source: BS 970 (Part 1):1983, Table 12
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
350 min
175
22
-
-
-
109-163 (note 4)
Normalized + turned or ground
-
over 63 to 150
330 min
165
22
-
-
-
101-152 (note 4)
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
6 to 13
450 min
330
10
-
-
-
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 13 to 29
430 min
320
12
-
-
-
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 29 to 100
400 min
300
13
-
-
-
-
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
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