BS 970 (Part 1):1983 216A42: 216A42 is a carbon manganese free-cutting steel grade specified in BS 970 Part 1:1983 (Table 6, category 2). 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
0.40-0.45
1.20-1.50
<=0.25
<=0.060
0.12-0.20
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Sulphur
May be ordered to narrower ranges of sulphur (note 17)
Source: BS 970 (Part 1):1983, Table 6
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
Q
150
625-775
400
16
20
22
370
179-229
R
100
700-850
450
15
15
16
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
Comparison with earlier editions
BS 970:1970/72 designation
Not listed
BS 970:1955 En No.
None
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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