IS 5517:1993 40Cr4 Steel: Specifications & Listings
IS 5517:1993 40Cr4: 40Cr4 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
0.35-0.45
0.10-0.35
0.60-0.90
0.90-1.20
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
700-850 MPa
Yield Strength (0.2% proof)
540 MPa min
Elongation
>=18%
Izod Impact
55 J min
Hardness (annealed)
<=241 HB
Condition
Hardened and tempered, ruling section up to 100 mm
More data from IS 5517:1993
From the standard
Heat treatment temperatures5 values
Hot working temperature
1200 to 850 °C
Normalising temperature
850 to 880 °C
Hardening temperature
850 to 880 °C
Quenching medium
Oil
Tempering temperature
550 to 700 °C
Source: IS 5517:1993 with Amendments 1 to 3, Table 4
Properties after hardening and tempering, by ruling section3 sections
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
700 to 850
540
18
55
100
800 to 950
600
16
55
63
900 to 1050
700
15
55
30
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 condition3 conditions
As annealed (A), maximum
241 HB
As rolled (R), maximum
250 HB
Treated for improved machinability (M), maximum
241 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
Hardenability, end quench testHardness band
Hardness band (HRC, minimum to maximum) by distance from the quenched end (mm)
1.5
3
5
7
9
11
13
15
20
25
30
35
40
45
50
Distance from quenched end (mm)
1.5
3
5
7
9
11
13
15
20
25
30
35
40
45
50
Maximum, HRC
61
61
60
59
58
56
54
52
46
42
40
38
37
36
35
Minimum, HRC
53
52
50
47
44
40
37
35
30
27
25
23
22
21
20
Provisional limits for the end quench test.
Source: IS 5517:1993 with Amendments 1 to 3, Table 7
Active IS 5517:1993 40Cr4 Listings on M-EX (For Sale)