Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
0.12-0.18
0.60-1.00
Mechanical Properties
Condition
Case hardened, 19 mm test bar
Tensile Strength
460 MPa min
Elongation
18 % min
More data from BS 970 (Part 1):1991
From the standard
Other composition limits
Category
Category 1 steel
Category 1 steels are preferred for new designs and established designs (clauses 1.4 and 2.1). Category 2 steels are printed in italic type.
Source: BS 970 (Part 1):1991, Table 8
Core properties after case hardening, by test bar diameter
Test bar diameter (mm)
Tensile strength, min (MPa)
Elongation, min (%)
Impact Izod, min (ft lb)
Impact KCV, min (J)
13
490
18
30
35
19 (preferred size)
460
18
30
35
29
430
18
30
35
Properties of simulated case hardened test bars (clause 1.13.3.4). 1 N/mm2 = 1 MPa. Note 29: these are new steels which may have been conservatively rated due to limited data.
Source: BS 970 (Part 1):1991, Table 8
Heat treatment
Hardening temperature
900-930 deg C
Table 9: heat treatment of case hardening steels. Values as printed; a dash in the table means not specified.
Source: BS 970 (Part 1):1991, Table 9
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