BS 970 (Part 1):1983 226M44: 226M44 is a carbon manganese free-cutting steel grade specified in BS 970 Part 1:1983 (Table 6, category 1). Section three of the standard advises that category 1 steels be used for new designs and established designs whenever possible.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
Si
P
S
0.40-0.48
1.30-1.70
<=0.25
<=0.060
0.22-0.30
More data from BS 970 (Part 1):1983
From the standard
Heat treatment and maximum hardness (through hardening)
Hardening temperature
830-860 deg C
Quenching medium
Oil
Tempering temperature
550-660 deg C
Hardenability test
No hardenability data specified
Softened condition
Not usually supplied in the softened condition
Heat treatment to be given to test bars and to material required in the finally heat treated condition. Note 24: O = oil, W = water. Where oil hardening is specified, either a well-agitated conventional oil or a proven synthetic quenchant may be used. Synthetic quenchants shall not be used for the heat treatment of test bars for material not supplied in the finally heat treated condition.
Source: BS 970 (Part 1):1983, Table 7
Mechanical properties by heat treatment condition
Condition
Limiting ruling section (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
R
100
700-850
450
16
20
22
415
201-255
S
29
775-925
525
14
15
16
495
223-277
T (note 13)
13
850-1000
600
12
15
16
585
248-302
Values as printed in Table 6 for the limiting ruling section shown. Rp0.2 applies when specifically ordered (note 10). 1 N/mm2 = 1 MPa. Note 13: may not always be obtained by bulk heat treatment, but the properties can be achieved by the appropriate heat treatment of die forgings and components, and also apply to test bars.
Source: BS 970 (Part 1):1983, Table 6
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
Hardened and tempered + turned or ground
R
6 to 100
700-850
450
16
20
22
415
201-255
Hardened and tempered + turned or ground
S
6 to 29
775-925
525
14
15
16
495
223-277
Hardened and tempered + turned or ground
T (note 13)
6 to 13
850-1000
600
12
15
16
585
248-302
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
R
6 to 100
700-850
525
12
20
-
435
201-255 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
S
6 to 29
775-925
575
10
15
-
520
223-277 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
T (note 13)
6 to 13
850-1000
630
9
15
-
600
248-302 (note 4)
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. Note 13: may not always be obtained by bulk heat treatment, but the properties can be achieved by the appropriate heat treatment of die forgings and components, and also apply to test bars.
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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