IS 5517:1993 55C8 Steel: Specifications & Listings
IS 5517:1993 55C8: 55C8 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
0.50-0.60
0.10-0.35
0.60-0.90
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
700-850 MPa
Yield Strength (0.2% proof)
460 MPa min
Elongation
>=15%
Hardness (annealed)
<=220 HB
Condition
Hardened and tempered, ruling section up to 63 mm
More data from IS 5517:1993
From the standard
Heat treatment temperatures5 values
Hot working temperature
1150 to 850 °C
Normalising temperature
810 to 840 °C
Hardening temperature
810 to 840 °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 section2 sections
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
700 to 850
460
15
Not specified
63
800 to 950
540
13
Not specified
30
Values apply to test bars taken from rounds along the direction of rolling.
Source: IS 5517:1993 with Amendments 1 to 3, Table 5
Hardness by delivery condition3 conditions
As annealed (A), maximum
220 HB
As rolled (R), maximum
250 HB
Treated for improved machinability (M), maximum
229 HB
For improved machinability the microstructure of the steel may be mutually agreed between the manufacturer and the purchaser.
Source: IS 5517:1993 with Amendments 1 to 3, Table 6
Active IS 5517:1993 55C8 Listings on M-EX (For Sale)