Close Alternative — 79% match
based on chemical composition and mechanical property overlap.
IS 1570 (Part 4) 55Cr3 (IS 1570 (Part 4):1988) and IS 1570 (Part 4) 40Cr4 (IS 1570 (Part 4):1988) are both steel grades.
Both fall under the Alloy Steel category.
IS 1570 (Part 4) 55Cr3 is defined under Bureau of Indian Standards (IS), originating from India, while IS 1570 (Part 4) 40Cr4 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, IS 1570 (Part 4) 55Cr3 vs IS 1570 (Part 4) 40Cr4 is a 81% match.
As per mechanical properties, the match is 75%.
Combined, this makes them a close alternative overall at 79%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
IS 1570 (Part 4) 55Cr3
IS 1570 (Part 4) 40Cr4
Tensile Strength
890-1040 MPa
890-1040 MPa
Yield Strength
>=650 MPa (0.2 % proof stress)
>=650 MPa (0.2 % proof stress)
Elongation
>=12%
>=11%
Izod Impact
>=35 J
>=50 J
Hardness
255-311 HBS (guidance only)
255-311 HBS (guidance only)
Condition
Wear resisting steel, hardened and tempered, limiting ruling section 63 mm
Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm
Can IS 1570 (Part 4) 55Cr3 Be Substituted With IS 1570 (Part 4) 40Cr4?
IS 1570 (Part 4) 55Cr3 and IS 1570 (Part 4) 40Cr4 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
What is the difference between IS 1570 (Part 4) 55Cr3 and IS 1570 (Part 4) 40Cr4?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 1570 (Part 4) 55Cr3 be substituted with IS 1570 (Part 4) 40Cr4?
IS 1570 (Part 4) 55Cr3 and IS 1570 (Part 4) 40Cr4 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.