Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; carbon and carbon manganese steel (Table 13)
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
0.12-0.18
0.10-0.40
0.60-1.00
<=0.05
<=0.05
More data from BS 970 (Part 3):1991
From the standard
Other composition limits
Steel group
Carbon and carbon manganese steel (Table 13)
Also listed as
Case hardening steel, carbon and carbon manganese (Table 14)
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 and Table 14
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 ≤ 63
350 min.
175
22
—
—
—
109-163
Normalized + turned or ground
> 63 ≤ 150
330 min.
165
22
—
—
—
101-152
Hot rolled + cold drawn or hot rolled + cold drawn + ground
≥ 6 ≤ 13
450 min.
330
10
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 13 ≤ 29
430 min.
320
12
Hot rolled + cold drawn or hot rolled + cold drawn + ground
> 29 ≤ 100
400 min.
300
13
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
Core properties by test bar diameter (blank carburized)
Test bar diameter (mm)
Tensile strength Rm, min (MPa)
Elongation, min (%)
Impact Izod, min (J)
Impact KCV, min (J)
13
490
16
40
35
19 (preferred size)
460
16
40
35
29
430
18
40
35
Mechanical tests are in the blank carburized condition (clause 7.3.3). The 19 mm test piece is to be used unless otherwise agreed (clause 10.4). See also option A.3.
Source: BS 970 (Part 3):1991, Table 22
Heat treatment temperatures
Normalizing temperature
890-920 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 22 and Table 27
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