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BS 970 (Part 3) 817M40 vs IS 5517 40Ni6Cr4Mo3

Strong Match — 90.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) and IS 5517 40Ni6Cr4Mo3 (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 40Ni6Cr4Mo3 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 (Part 3) 817M40 vs IS 5517 40Ni6Cr4Mo3 is a 90.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 90.9%.

Frequently Compared With BS 970 (Part 3) 817M40:
GOST 4543 12HN3A UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
90.9%
MECHANICAL MATCH
No shared data
OVERALL
90.9%
Specifications
Property BS 970 (Part 3) 817M40 IS 5517 40Ni6Cr4Mo3
Standard BS 970 (Part 3):1991 IS 5517:1993
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.35-0.45
Si (%) 0.10-0.40 0.10-0.35
Mn (%) 0.45-0.70 0.40-0.70
P (%) <=0.035 <=0.035
S (%) <=0.040 <=0.035
Cr (%) 1.00-1.40 0.90-1.30
Mo (%) 0.20-0.35 0.20-0.35
Ni (%) 1.30-1.70 1.25-1.75
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 40Ni6Cr4Mo3
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 40Ni6Cr4Mo3
Not documented
Can BS 970 (Part 3) 817M40 Be Substituted With IS 5517 40Ni6Cr4Mo3?
BS 970 (Part 3) 817M40 and IS 5517 40Ni6Cr4Mo3 overlap closely enough on chemistry and mechanical properties that IS 5517 40Ni6Cr4Mo3 is often considered as a substitute for BS 970 (Part 3) 817M40 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
BS 970 (Part 3) 817M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6200–6500 mm (244.09–255.91 in)
IS 5517 40Ni6Cr4Mo3
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On M-EX Right Now
BS 970 (Part 3) 817M40
2 active listings and RFQs →
IS 5517 40Ni6Cr4Mo3
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 817M40 and IS 5517 40Ni6Cr4Mo3?
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 40Ni6Cr4Mo3?
BS 970 (Part 3) 817M40 and IS 5517 40Ni6Cr4Mo3 overlap closely enough on chemistry and mechanical properties that IS 5517 40Ni6Cr4Mo3 is often considered as a substitute for BS 970 (Part 3) 817M40 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.