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
0.36-0.44
0.10-0.40
0.60-1.00
<=0.05
<=0.05
Typical Available Sizes
Round Bar
10mm–250mm dia
Flat Bar
16×5mm–200×50mm
Sizes are indicative. Contact seller for exact availability.
More data from BS 970 (Part 3):1991
From the standard
Other composition limits
Steel group
Carbon and carbon manganese steel (Table 13)
Condition of supply
Bright bars: cold drawn, turned or precision ground, in straight lengths
Maximum unless a range is stated.
Source: BS 970 (Part 3):1991, Table 13
Mechanical properties by heat treatment condition
Condition
Reference symbol
Size (mm)
Tensile strength Rm (MPa)
Yield Re, min (MPa)
Elongation, min (%)
Impact Izod, min (J)
Impact KCV, min (J)
Rp0.2, min (MPa)
Hardness HB
Notes
Normalized + turned or ground
≥ 6 ≤ 150
550 min.
280
16
20
16
—
152-207
Normalized + turned or ground
> 150 ≤ 250
510 min.
245
17
—
—
—
146-197
Hot rolled + cold drawn or hot rolled + cold drawn + ground
≥ 6 ≤ 13
660 min.
530
7
—
—
495
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 13 ≤ 16
650 min.
510
8
—
—
485
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 16 ≤ 40
620 min.
480
9
—
—
435
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 40 ≤ 63
600 min.
465
10
—
—
370
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 63 ≤ 76
570 min.
430
10
—
—
350
Hardened and tempered + turned or ground
Q
≥ 6 ≤ 63
625-775
385
16
34
28
355
179-229
Hardened and tempered + turned or ground
R
≥ 6 ≤ 19
700-850
465
16
34
28
450
201-255
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
Q
≥ 6 ≤ 63
625-775
435
12
34
—
380
179-229
Hardened and tempered + cold drawn or hardened and tempered + cold drawn + ground
R
≥ 6 ≤ 19
700-850
490
12
34
—
460
201-255
Condition letters P to Z are the tensile strength ranges of Table 29. Rp0.2 applies when specifically ordered (note 3). Hardness HB is for guidance only except in the softened condition (note 13). Impact: Izod, or KCV when the standard impact test is not required (option A.3).
Source: BS 970 (Part 3):1991, Table 20
Heat treatment temperatures
Normalizing temperature
830-860 deg C
Hardening temperature
830-860 deg C, oil
Tempering temperature
550-660 deg C
Normalizing, hardening and tempering temperatures as given in Tables 27 and 28 (clause 4.2); Table 22 hardening temperatures for case hardening steels.
Source: BS 970 (Part 3):1991, Table 27 and Table 28