IS 5517:1993 45CrSi9 Steel: Specifications & Listings
IS 5517:1993 45CrSi9: 45CrSi9 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
0.40-0.50
2.75-3.25
0.30-0.60
8.50-9.50
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
880-1030 MPa
Yield Strength (0.2% proof)
685 MPa min
Elongation
>=10%
Hardness (annealed)
<=240 HB
Condition
Hardened and tempered
More data from IS 5517:1993
From the standard
Heat treatment temperatures4 values
Hot working temperature
1100 to 900 °C
Hardening temperature
1020 to 1070 °C
Quenching medium
Oil
Tempering temperature
770 to 820 °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)
880 to 1030
685
10
Not specified
Not specified
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 condition2 conditions
As annealed (A), maximum
240 HB
As rolled (R), maximum
250 HB
Source: IS 5517:1993 with Amendments 1 to 3, Table 6
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