IS 4367:1991 55Si7 Steel: Specifications & Listings
IS 4367:1991 55Si7: 55Si7 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
S
P
0.50-0.60
1.50-2.00
0.80-1.00
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
1300-1500 MPa
Hardness
380-440 HB
Hardness (soft annealed)
<=245 HB
Condition
Hardened and tempered, ruling section up to 100 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)
1300 to 1500
Not specified
Not specified
Not specified
380 to 440
100
Test condition: hardened and tempered. Maximum hardness in the soft annealed condition: 245 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
Active IS 4367:1991 55Si7 Listings on M-EX (For Sale)