IS 1570 (Part 4):1988 27C15 Steel: Specifications & Listings
IS 1570 (Part 4):1988 27C15: 27C15: alloy steel (constructional or spring group) with specified chemical composition. Specified in IS 1570 (Part 4):1988.
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
0.22-0.32
0.10-0.35
1.30-1.70
Mechanical Properties
Tensile Strength
690-840 MPa
Yield Strength
>=450 MPa (0.2 % proof stress)
Elongation
>=16%
Izod Impact
>=48 J
Hardness
201-248 HBS (guidance only)
Condition
Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 63 mm
More data from IS 1570 (Part 4):1988
From the standard
Tensile limits, hot rolled or normalized5 ruling sections
Limiting ruling section (mm)
Tensile strength (MPa)
0.2 % proof stress, min, if specified (MPa)
Elongation, min (%)
30
570-670
350
20
45
570-670
340
20
63
570-670
320
20
100
540-640
300
20
over 100 to 150
540-640
290
20
Plates, sections, bars, billets and forgings in the hot rolled or normalized condition.
Source: IS 1570 (Part 4):1988, Table 2
Properties, hardened and tempered2 strength levels
Limiting ruling section (mm)
Tensile strength (MPa)
0.2 % proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Brinell hardness (HBS)
100
590-740
390
18
48
170-217
63
690-840
450
16
48
201-248
Bars and forgings, oil hardened unless stated; hardness is for guidance only.
Source: IS 1570 (Part 4):1988, Table 4
Tensile limits, tubes2 conditions
Condition
Tensile strength, min (MPa)
0.2 % proof stress, min (MPa)
Hardened and tempered or cold drawn and tempered
550
450
Hardened and tempered or cold drawn and tempered
630
510
Elongation printed as 9 310 over actual tensile strength (MPa).
Source: IS 1570 (Part 4):1988, Table 11
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