IS 4367:1991 40Cr4Mo3 Steel: Specifications & Listings
IS 4367:1991 40Cr4Mo3: 40Cr4Mo3 is a steel in IS 4367:1991 (Alloy Steel Forgings for General Industrial Use), which covers forgings in the as forged, heat-treated or machined condition.
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
Mo
S
P
0.35-0.45
0.10-0.35
0.50-0.80
0.90-1.20
0.20-0.35
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
700-850 MPa
Yield Strength
540 MPa min
Elongation
>=18%
Izod Impact
55 J min
Hardness
208-252 HB
Hardness (soft annealed)
<=220 HB
Condition
Hardened and tempered, ruling section up to 150 mm
Typical Available Sizes
Round Bar
16-350 mm dia
Flat Bar
20-200 mm width
Sizes are indicative. Contact seller for exact availability.
More data from IS 4367:1991
From the standard
Properties by ruling section4 sections
Tensile strength (MPa)
Yield strength, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Hardness (HB)
Limiting ruling section (mm)
700 to 850
540
18
55
208 to 252
150
800 to 950
600
16
55
235 to 280
100
900 to 1050
700
15
50
266 to 311
63
1000 to 1150
800
13
45
295 to 341
30
Test condition: hardened and tempered. Maximum hardness in the soft annealed condition: 220 HB.
Source: IS 4367:1991 with Amendments 1 and 2, Table 3
Sulphur, phosphorus and aluminium limitsordering options
Option 1
Sulphur and phosphorus 0.030 max each
Option 2
Sulphur 0.020 to 0.035, phosphorus 0.035 max
Aluminium, when the steel is aluminium killed
0.02 to 0.05
The purchaser orders sulphur and phosphorus under option 1 or option 2.
Source: IS 4367:1991 with Amendments 1 and 2, Table 1, notes 1 and 2