IS 11169 (Part 1) 40Cr4Mo3 vs BS 970 (Part 1) 709M40
Close Alternative — 81.5% match
based on chemical composition and mechanical property overlap.
IS 11169 (Part 1) 40Cr4Mo3 (IS 11169 (Part 1):2022) and BS 970 (Part 1) 709M40 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Alloy Steel category.
IS 11169 (Part 1) 40Cr4Mo3 is typically used for cold heading and cold extrusion of parts that are quenched and tempered; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, annex c), while BS 970 (Part 1) 709M40 is commonly used for used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners..
IS 11169 (Part 1) 40Cr4Mo3 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 709M40 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, IS 11169 (Part 1) 40Cr4Mo3 vs BS 970 (Part 1) 709M40 is a 81.5% 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 81.5%.
Frequently Compared With IS 11169 (Part 1) 40Cr4Mo3:
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
IS 11169 (Part 1) 40Cr4Mo3
BS 970 (Part 1) 709M40
Core Hardness (CH)
>=48 HRC up to 28 mm
Not specified
Hardness, annealed (+AC)
<=200 HBW
Not specified
Typical Applications
IS 11169 (Part 1) 40Cr4Mo3
Cold heading and cold extrusion of parts that are quenched and tempered; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, Annex C)
BS 970 (Part 1) 709M40
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Key Differences
IS 11169 (Part 1) 40Cr4Mo3 specifies Cu, P, S, Si which are not specified for BS 970 (Part 1) 709M40.
Can IS 11169 (Part 1) 40Cr4Mo3 Be Substituted With BS 970 (Part 1) 709M40?
IS 11169 (Part 1) 40Cr4Mo3 and BS 970 (Part 1) 709M40 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 11169 (Part 1) 40Cr4Mo3 and BS 970 (Part 1) 709M40?
IS 11169 (Part 1) 40Cr4Mo3 specifies Cu, P, S, Si which are not specified for BS 970 (Part 1) 709M40.
Can IS 11169 (Part 1) 40Cr4Mo3 be substituted with BS 970 (Part 1) 709M40?
IS 11169 (Part 1) 40Cr4Mo3 and BS 970 (Part 1) 709M40 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.