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):1991
From the standard
Other composition limits
Category
Category 1 steel
Sulphur
May be supplied with 0.050 % maximum, or 0.065 % to 0.10 % for improved machinability (Table 3, note 15)
Other micro-alloying additions
Nb, Ti and similar may be made singly or together; the total by product analysis shall be in the range 0.08 % to 0.20 % (note 16)
Steels in this table are not subject to grain size control.
Source: BS 970 (Part 1):1991, Table 3
Mechanical properties by condition
Condition
Limiting ruling section (mm)
Tensile strength Rm (MPa)
Yield Re, min (MPa)
Elongation, min (%)
Impact KCV, min (J)
Hardness 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
Tensile strength ranges are identical with those of the through hardened and tempered steels, but they are not achieved by hardening and tempering (note 14). Condition S, T, U as printed.
Source: BS 970 (Part 1):1991, Table 3
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