IS 4367:1991 15Cr3 Steel: Specifications & Listings
IS 4367:1991 15Cr3: 15Cr3 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.
Low-alloy chromium case-hardening steel; used for gears, shafts, and transmission components requiring higher core strength and wear resistance than plain carbon case-hardening grades
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
S
P
0.12-0.18
0.10-0.35
0.40-0.60
0.50-0.80
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
600 MPa min
Elongation
>=13%
Izod Impact
48 J min
Hardness (soft annealed)
<=170 HB
Condition
Refined, quenched and stress relieved (core properties), ruling section up to 30 mm
More data from IS 4367:1991
From the standard
Properties by ruling section1 section
Tensile strength (MPa)
Yield strength, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Hardness (HB)
Limiting ruling section (mm)
600 Min
Not specified
13
48
Not specified
30
Test condition: refined, quenched and stress relieved. The values are core properties of the case-hardening steel. Maximum hardness in the soft annealed condition: 170 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