IS 5517:1993 31Ni10Cr3Mo6 Steel: Specifications & Listings
IS 5517:1993 31Ni10Cr3Mo6: 31Ni10Cr3Mo6 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
Ni
Cr
Mo
S
P
0.27-0.35
0.10-0.35
0.40-0.70
2.25-2.75
0.50-0.80
0.40-0.70
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
900-1050 MPa
Yield Strength (0.2% proof)
700 MPa min
Elongation
>=15%
Izod Impact
55 J min
Hardness (annealed)
<=269 HB
Condition
Hardened and tempered, ruling section up to 150 mm
More data from IS 5517:1993
From the standard
Heat treatment temperatures4 values
Hot working temperature
1200 to 850 °C
Hardening temperature
830 to 850 °C
Quenching medium
Oil
Tempering temperature
Up to 660 °C
Source: IS 5517:1993 with Amendments 1 to 3, Table 4
Properties after hardening and tempering, by ruling section5 sections
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
900 to 1050
700
15
55
150
1000 to 1150
800
12
48
150
1100 to 1250
880
11
41
100
1200 to 1350
1000
10
35
63
1550 Min
1300
8
14
63
Values apply to test bars taken from rounds along the direction of rolling. Izod impact values are for fine grained steels. Mechanical properties for steels having a minimum tensile strength of 1340 MPa and above are given for information only; the delivery condition on the basis of chemical composition and hardenability shall apply in such cases.
Source: IS 5517:1993 with Amendments 1 to 3, Table 5
Hardness by delivery condition2 conditions
As annealed (A), maximum
269 HB
As rolled (R), maximum
As per agreement
Source: IS 5517:1993 with Amendments 1 to 3, Table 6
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