BS 970 (Part 1):1983 530M40: 530M40 is an alloy 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
Cr
P
S
0.36-0.44
0.60-0.90
0.90-1.20
<=0.035
<=0.040
More data from BS 970 (Part 1):1983
From the standard
Other composition limits
Phosphorus and sulphur
P 0.035 max, S 0.040 max, alloy steels (clause 1.7.2.1)
Residual elements: see clause 1.7.3.
Source: BS 970 (Part 1):1983, clause 1.7.2.1
Heat treatment and maximum hardness (through hardening)
Hardening temperature, oil quench
850-880 deg C
Hardening temperature, water quench
830-860 deg C
Tempering temperature
550-700 deg C
Maximum hardness HB, softened condition
217
Maximum hardness HB, temper softened condition
235
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
R
100
700-850
525
17
40
50
510
201-255
S
63
775-925
585
15
40
50
570
223-277
T
29
850-1000
680
13
40
50
665
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.
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
Hardened and tempered + turned or ground
R
over 63 to 100
700-850
525
17
40
50
510
201-255
Hardened and tempered + turned or ground
S
6 to 63
775-925
585
15
40
50
570
223-277
Hardened and tempered + turned or ground
T
6 to 29
850-1000
680
13
40
50
665
248-302
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
R
over 63 to 100
700-850
540
12
40
-
525
201-255 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
S
over 13 to 63
775-925
600
11
40
-
585
223-277 (note 4)
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
T
6 to 29
850-1000
700
9
40
-
680
248-302 (note 4)
Turned, ground or cold drawn and finally softened
-
-
-
-
-
-
-
-
229 max
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
Active BS 970 (Part 1):1983 530M40 Listings on M-EX (For Sale)