IS 5517:1993 55Cr3 Steel: Specifications & Listings
IS 5517:1993 55Cr3: 55Cr3 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
Cr
S
P
0.50-0.60
0.10-0.35
0.60-0.80
0.60-0.80
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
900-1050 MPa
Yield Strength (0.2% proof)
660 MPa min
Elongation
>=12%
Izod Impact
35 J min
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
1200 to 850 °C
Normalising temperature
800 to 850 °C
Hardening temperature
800 to 850 °C
Quenching medium
Oil
Tempering temperature
500 to 700 °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)
900 to 1050
660
12
35
63
1000 to 1150
740
10
17
63
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
220 HB
As rolled (R), maximum
250 HB
Source: IS 5517:1993 with Amendments 1 to 3, Table 6
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