BS 970 (Part 1):1983 080H41: 080H41 is a carbon 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
P
S
0.38-0.45
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)
860 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
63
625-775
385
16
25
28
355
179-229
R
19
700-850
465
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
Hardenability requirements (end quench test)
Distance from quenched end (mm)
HV 20 or HV 30 max
HV 20 or HV 30 min
1.25
750
600
2.00
730
550
2.75
700
485
3.50
665
355
4.25
615
285
5.00
550
255
5.75
475
245
6.50
410
240
7.25
365
237
9.00
330
233
10.5
315
230
12.0
305
225
15.0
295
225
20.0
285
220
25.0
270
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
080H41
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
Active BS 970 (Part 1):1983 080H41 Listings on M-EX (For Sale)