BS 970 (Part 1):1983 280M01: 280M01 is a micro-alloyed carbon manganese steel grade specified in BS 970 Part 1:1983 (Table 5, category 1). Section three of the standard advises that category 1 steels be used for new designs and established designs whenever possible.
Micro-alloyed carbon manganese steel for mechanical and allied engineering purposes; strength levels S, T and U are obtained without hardening and tempering (Table 5).
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
V
Al
0.30-0.55
0.15-0.60
0.60-1.50
<=0.035
0.045-0.065
0.08-0.20
<=0.035
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Sulphur (note 15)
May be supplied with 0.050 max or, to obtain improved machinability, with 0.065 to 0.10 sulphur
Micro-alloying additions (note 16)
Other micro-alloying additions (such as Nb, Ti) may be made, singly or in combination, in which case the total, as determined by product analysis, shall be in the range 0.08 to 0.20
Source: BS 970 (Part 1):1983, Table 5
Mechanical properties, micro-alloyed condition
Condition
Limiting ruling section (mm)
Rm (N/mm2)
Re min (N/mm2)
A min (%)
KCV min (J)
HB
S
100
775-925
530
14
10
223-277
T
100
850-1000
560
12
8
248-302
U
100
925-1075
600
10
8
269-331
The tensile strength ranges are identical with those for the through hardened and tempered steels, but in this case they are not achieved by hardening and tempering. The other properties may differ from those of the hardened and tempered steels; see note 3 to 1.6.4.2 with respect to grain size (note 14). 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1983, Table 5
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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