BS 970 (Part 1):1983 150M19: 150M19 is a carbon manganese 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
P
S
0.15-0.23
1.30-1.70
<=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)
Residual elements: see clause 1.7.3.
Source: BS 970 (Part 1):1983, Table 6
Heat treatment and maximum hardness (through hardening)
Hardening temperature
860-900 deg C
Quenching medium
Oil or water
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
150
550-700
340
18
40
50
325
152-207
Q
63
625-775
430
16
40
50
415
179-229
R
29
700-850
510
16
30
35
495
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
Normalized + turned or ground
-
6 to 150
550 min
325
18
30
35
-
152-207 (note 4)
Normalized + turned or ground
-
over 150 to 250
510 min
295
17
-
-
-
146-197 (note 4)
Hardened and tempered + turned or ground
P
over 13 to 150
550-700
340
18
40
50
325
152-207
Hardened and tempered + turned or ground
Q
6 to 63
625-775
430
16
40
50
415
179-229
Hardened and tempered + turned or ground
R
6 to 29
700-850
510
16
30
35
495
201-255
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
P
over 19 to 150
550-700
360
13
40
-
345
152-207 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
Q
6 to 63
625-775
450
12
40
-
435
179-229 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
R
6 to 29
700-850
520
12
30
-
510
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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