Close Alternative — 80.6% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) and IS 5517 40Ni6Cr4Mo2 (IS 5517:1993) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 (Part 3) 817M40 is defined under British Standards (BS), originating from United Kingdom, while IS 5517 40Ni6Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, BS 970 (Part 3) 817M40 vs IS 5517 40Ni6Cr4Mo2 is a 80.6% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a close alternative overall at 80.6%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
BS 970 (Part 3) 817M40
IS 5517 40Ni6Cr4Mo2
Tensile Strength
Not specified
800-950 MPa
Yield Strength (0.2% proof)
Not specified
600 MPa min
Elongation
Not specified
>=16%
Izod Impact
Not specified
55 J min
Hardness (annealed)
Not specified
<=241 HB
Condition
Not specified
Hardened and tempered, ruling section up to 150 mm
Typical Applications
BS 970 (Part 3) 817M40
High tensile shafts, gears, crankshafts
IS 5517 40Ni6Cr4Mo2
Not documented
Can BS 970 (Part 3) 817M40 Be Substituted With IS 5517 40Ni6Cr4Mo2?
BS 970 (Part 3) 817M40 and IS 5517 40Ni6Cr4Mo2 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 BS 970 (Part 3) 817M40 and IS 5517 40Ni6Cr4Mo2?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 817M40 be substituted with IS 5517 40Ni6Cr4Mo2?
BS 970 (Part 3) 817M40 and IS 5517 40Ni6Cr4Mo2 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.