BS 970 (Part 1):1983 080H46: 080H46 is a carbon 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
0.43-0.50
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)
Residual elements: see clause 1.7.3.
Source: BS 970 (Part 1):1983, Table 6
Heat treatment and maximum hardness (through hardening)
Preheat treatment temperature (hardenability test)
880-900 deg C
Austenitizing temperature (hardenability test)
850 deg C
Softened condition
Not usually supplied in the softened 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
Q
100
625-775
370
16
-
-
340
179-229
R
29
700-850
450
16
-
-
415
201-255
S
13
775-925
525
14
-
-
510
223-277
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
Hardenability requirements (end quench test)
Distance from quenched end (mm)
HV 20 or HV 30 max
HV 20 or HV 30 min
1.25
800
650
2.00
770
590
2.75
735
500
3.50
695
355
4.25
650
295
5.00
580
270
5.75
500
260
6.50
440
255
7.25
390
250
9.00
340
245
10.5
325
240
12.0
315
235
15.0
310
228
20.0
300
220
25.0
290
210
Vickers hardness (HV 20 or HV 30) at the stated distance from the quenched end in the end quench hardenability test. A dash means no value is specified. Preheat and austenitizing temperatures: see the heat treatment block.
Source: BS 970 (Part 1):1983, Table 8
Comparison with earlier editions
BS 970:1970/72 designation
080H46
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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