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BS 970 (Part 3) 817M40 vs IS 1570 (Part 4) 40Ni6Cr4Mo3

Strong Match — 89.8% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) and IS 1570 (Part 4) 40Ni6Cr4Mo3 (IS 1570 (Part 4):1988) 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 1570 (Part 4) 40Ni6Cr4Mo3 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 (Part 3) 817M40 vs IS 1570 (Part 4) 40Ni6Cr4Mo3 is a 89.8% 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 89.8%.

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
89.8%
MECHANICAL MATCH
No shared data
OVERALL
89.8%
Specifications
Property BS 970 (Part 3) 817M40 IS 1570 (Part 4) 40Ni6Cr4Mo3
Standard BS 970 (Part 3):1991 IS 1570 (Part 4):1988
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 Not specified
S (%) <=0.040 Not specified
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 1570 (Part 4) 40Ni6Cr4Mo3
Tensile Strength Not specified 1190-1340 MPa
Yield Strength Not specified >=930 MPa (0.2 % proof stress)
Elongation Not specified >=10%
Izod Impact Not specified >=30 J
Hardness Not specified 341-401 HBS (guidance only)
Condition Not specified Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm
Typical Applications
BS 970 (Part 3) 817M40
High tensile shafts, gears, crankshafts
IS 1570 (Part 4) 40Ni6Cr4Mo3
Not documented
Key Differences
Can BS 970 (Part 3) 817M40 Be Substituted With IS 1570 (Part 4) 40Ni6Cr4Mo3?
BS 970 (Part 3) 817M40 and IS 1570 (Part 4) 40Ni6Cr4Mo3 overlap closely enough on chemistry and mechanical properties that IS 1570 (Part 4) 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 1570 (Part 4) 40Ni6Cr4Mo3
No active listings currently.
On M-EX Right Now
BS 970 (Part 3) 817M40
2 active listings and RFQs →
IS 1570 (Part 4) 40Ni6Cr4Mo3
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 3) 817M40 and IS 1570 (Part 4) 40Ni6Cr4Mo3?
BS 970 (Part 3) 817M40 specifies P, S which are not specified for IS 1570 (Part 4) 40Ni6Cr4Mo3.
Can BS 970 (Part 3) 817M40 be substituted with IS 1570 (Part 4) 40Ni6Cr4Mo3?
BS 970 (Part 3) 817M40 and IS 1570 (Part 4) 40Ni6Cr4Mo3 overlap closely enough on chemistry and mechanical properties that IS 1570 (Part 4) 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.