IS 1570 (Part 4):1988 31Ni10Cr3Mo6 Steel: Specifications & Listings
IS 1570 (Part 4):1988 31Ni10Cr3Mo6: 31Ni10Cr3Mo6: 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
Ni
Cr
Mo
0.27-0.35
0.10-0.35
0.40-0.70
2.25-2.75
0.50-0.80
0.40-0.70
Mechanical Properties
Tensile Strength
1190-1340 MPa
Yield Strength
>=930 MPa (0.2 % proof stress)
Elongation
>=10%
Izod Impact
>=35 J
Hardness
341-401 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
Properties, hardened and tempered5 strength levels
Limiting ruling section (mm)
Tensile strength (MPa)
0.2 % proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Brinell hardness (HBS)
150
890-1040
650
15
55
255-311
150
990-1140
750
12
48
285-341
100
1090-1240
830
11
41
311-363
63
1190-1340
930
10
35
341-401
63
>=1540
1240
8
14
>=444
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
1190
990
Hardened and tempered
1390
1190
Elongation printed as 9 310 over actual tensile strength (MPa).
Source: IS 1570 (Part 4):1988, Table 11
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