IS 5517:1993 27C15 Steel: Specifications & Listings
IS 5517:1993 27C15: 27C15 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
0.22-0.32
0.10-0.35
1.30-1.70
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
600-750 MPa
Yield Strength (0.2% proof)
440 MPa min
Elongation
>=18%
Izod Impact
48 J min
Hardness (annealed)
<=200 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
840 to 880 °C
Hardening temperature
840 to 880 °C
Quenching medium
Water or 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)
600 to 750
440
18
48
63
700 to 850
500
16
48
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
200 HB
As rolled (R), maximum
240 HB
Treated for improved machinability (M), maximum
223 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
55
54
51
48
45
42
39
37
33
31
29
28
27
27
26
Minimum, HRC
43
40
32
24
20
-
-
-
-
-
-
-
-
-
-
Provisional limits for the end quench test.
Source: IS 5517:1993 with Amendments 1 to 3, Table 7
Active IS 5517:1993 27C15 Listings on M-EX (For Sale)