IS 5517:1993 55Si6Cr3 Steel: Specifications & Listings
IS 5517:1993 55Si6Cr3: 55Si6Cr3 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
1.20-1.60
0.50-0.80
0.50-0.80
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
1400-1600 MPa
Yield Strength (0.2% proof)
1200 MPa min
Elongation
>=6%
Hardness (annealed)
<=220 HB
Condition
Hardened and tempered, ruling section up to 16 mm
More data from IS 5517:1993
From the standard
Heat treatment temperatures5 values
Hot working temperature
1050 to 850 °C
Normalising temperature
850 to 880 °C
Hardening temperature
830 to 860 °C
Quenching medium
Oil
Tempering temperature
430 to 500 °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)
1400 to 1600
1200
6
Not specified
16
Values apply to test bars taken from rounds along the direction of rolling. Mechanical properties for steels having a minimum tensile strength of 1340 MPa and above are given for information only; the delivery condition on the basis of chemical composition and hardenability shall apply in such cases.
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
220 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
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