IS 1570 (Part 4):1988 40Cr4 Steel: Specifications & Listings
IS 1570 (Part 4):1988 40Cr4: 40Cr4: 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
Cr
0.35-0.45
0.10-0.35
0.60-0.90
0.90-1.20
Mechanical Properties
Tensile Strength
890-1040 MPa
Yield Strength
>=650 MPa (0.2 % proof stress)
Elongation
>=11%
Izod Impact
>=50 J
Hardness
255-311 HBS (guidance only)
Condition
Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm
More data from IS 1570 (Part 4):1988
From the standard
Properties, hardened and tempered3 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
690-840
490
14
55
201-248
63
790-940
550
12
50
229-277
30
890-1040
650
11
50
255-311
Bars and forgings, oil hardened unless stated; hardness is for guidance only.
Source: IS 1570 (Part 4):1988, Table 4
Tensile limits, tubes1 conditions
Condition
Tensile strength, min (MPa)
0.2 % proof stress, min (MPa)
Hardened and tempered
1090
890
Elongation printed as 9 310 over actual tensile strength (MPa).
Source: IS 1570 (Part 4):1988, Table 11
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