BS 970 (Part 1):1983 216M36: 216M36 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
0.32-0.40
1.30-1.70
<=0.25
<=0.060
0.12-0.20
More data from BS 970 (Part 1):1983
From the standard
Heat treatment and maximum hardness (through hardening)
Hardening temperature
840-870 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
P
100
550-700
340
20
25
28
310
152-207
Q
63
625-775
400
18
25
28
370
179-229
R
29
700-850
480
16
25
28
450
201-255
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.
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
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
6 to 13
680 min
530
6
-
-
510
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 13 to 16
650 min
510
7
-
-
487
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 16 to 40
620 min
480
7
-
-
434
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 40 to 63
600 min
460
8
-
-
372
-
Hot rolled + cold drawn or hot rolled + cold drawn + ground
-
over 63 to 76
570 min
420
9
-
-
353
-
Hardened and tempered + turned or ground
P
6 to 100
550-700
340
20
25
28
310
152-207
Hardened and tempered + turned or ground
Q
6 to 63
625-775
400
18
25
28
370
179-229
Hardened and tempered + turned or ground
R
6 to 29
700-850
480
16
25
28
450
201-255
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
P
over 29 to 100
550-700
380
15
25
-
340
152-207 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
Q
over 13 to 63
625-775
440
13
25
-
400
179-229 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
R
6 to 29
700-850
520
12
25
-
470
201-255 (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.
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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