IS 11169 (Part 1):1984 40C8 Steel: Specifications & Listings
IS 11169 (Part 1):1984 40C8: Cold heading quality carbon steel 40C8 to IS 11169 (Part 1):1984, for quenching and tempering, supplied as wire, wire rod or bars of 2 to 100 mm diameter. Old designation C40. The standard was reaffirmed in 2004.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Other composition limitsfrom the clauses and notes
Sulphur and phosphorus, maximum
0.035 percent each; other limits by agreement
Elements not specified, maximum
Cr 0.15, Ni 0.15, Cu 0.15, Sn 0.02, Mo 0.05, V 0.05 percent; total 0.40
Narrower carbon and silicon ranges may be agreed between purchaser and manufacturer; elements not listed are not added except by agreement or to finish the heat.
Source: IS 11169 (Part 1):1984, clauses 4.1.2, 4.1.3, 4.2 and 4.4, Table 2 notes
Hardness in the annealed condition1 condition
Annealed, maximum
170 HB
Brinell hardness for products delivered in the annealed condition.
Source: IS 11169 (Part 1):1984, Table 5, clause 8.1
Hardened and tempered, by ruling section3 sections
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Reduction of area (%)
Izod impact (J)
Limiting ruling section (mm)
660-810
450
16
40
-
16
620-770
390
18
45
20
40
580-730
340
19
50
20
100
Recommended values for guidance (clause 9.2.1), on test pieces taken from rounds in the direction of the fibre.
Source: IS 11169 (Part 1):1984, Table 6
Core hardenabilityguidance
Core hardness after oil quenching
40 HRC
Up to diameter
11 mm
Hardening temperature
830 to 860 °C
Diameter up to which this core hardness can be reached after quenching in an oil of high quenching capacity. For guidance only.
Source: IS 11169 (Part 1):1984, Appendix C
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