IS 5517:1993 40C15S12 Steel: Specifications & Listings
IS 5517:1993 40C15S12: 40C15S12 is a steel in IS 5517:1993 (Steels for Hardening and Tempering), intended in general for forgings and machined parts for engineering or automobile purposes.
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
S
P
0.35-0.45
<=0.25
1.30-1.70
0.08-0.15
<=0.035
Mechanical Properties
Tensile Strength
700-850 MPa
Yield Strength (0.2% proof)
500 MPa min
Elongation
>=18%
Izod Impact
35 J min
Hardness (annealed)
<=200 HB
Condition
Hardened and tempered, ruling section up to 60 mm
More data from IS 5517:1993
From the standard
Heat treatment temperatures5 values
Hot working temperature
1200 to 850 °C
Normalising temperature
840 to 870 °C
Hardening temperature
840 to 870 °C
Quenching medium
Oil
Tempering temperature
550 to 660 °C
Source: IS 5517:1993 with Amendments 1 to 3, Table 4
Properties after hardening and tempering, by ruling section1 section
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
700 to 850
500
18
35
60
Values apply to test bars taken from rounds along the direction of rolling. Izod impact values are for fine grained steels.
Source: IS 5517:1993 with Amendments 1 to 3, Table 5
Hardness by delivery condition2 conditions
As annealed (A), maximum
200 HB
As rolled (R), maximum
240 HB
Source: IS 5517:1993 with Amendments 1 to 3, Table 6
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