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IS 1570 (Part 4) 40Ni6Cr4Mo2 vs BS 970 (Part 1) 817M40

Close Alternative — 74.8% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 40Ni6Cr4Mo2 (IS 1570 (Part 4):1988) and BS 970 (Part 1) 817M40 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 40Ni6Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 817M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 4) 40Ni6Cr4Mo2 vs BS 970 (Part 1) 817M40 is a 74.8% 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 74.8%.

Frequently Compared With IS 1570 (Part 4) 40Ni6Cr4Mo2:
UNI 11234 100Cr6 NF A35-565 100C6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
74.8%
MECHANICAL MATCH
No shared data
OVERALL
74.8%
Specifications
Property IS 1570 (Part 4) 40Ni6Cr4Mo2 BS 970 (Part 1) 817M40
Standard IS 1570 (Part 4):1988 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.36-0.44
Si (%) 0.10-0.35 Not specified
Mn (%) 0.40-0.70 0.45-0.70
Ni (%) 1.20-1.60 1.30-1.70
Cr (%) 0.90-1.30 1.00-1.40
Mo (%) 0.10-0.20 0.20-0.35
P (%) Not specified <=0.035
S (%) Not specified <=0.040
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) 40Ni6Cr4Mo2 BS 970 (Part 1) 817M40
Tensile Strength 1090-1240 MPa Not specified
Yield Strength >=830 MPa (0.2 % proof stress) Not specified
Elongation >=11% Not specified
Izod Impact >=41 J Not specified
Hardness 311-363 HBS (guidance only) Not specified
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm Not specified
Typical Applications
IS 1570 (Part 4) 40Ni6Cr4Mo2
Not documented
BS 970 (Part 1) 817M40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can IS 1570 (Part 4) 40Ni6Cr4Mo2 Be Substituted With BS 970 (Part 1) 817M40?
IS 1570 (Part 4) 40Ni6Cr4Mo2 and BS 970 (Part 1) 817M40 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.
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IS 1570 (Part 4) 40Ni6Cr4Mo2
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BS 970 (Part 1) 817M40
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 40Ni6Cr4Mo2 and BS 970 (Part 1) 817M40?
IS 1570 (Part 4) 40Ni6Cr4Mo2 specifies Si which is not specified for BS 970 (Part 1) 817M40. BS 970 (Part 1) 817M40 specifies P, S which are not specified for IS 1570 (Part 4) 40Ni6Cr4Mo2.
Can IS 1570 (Part 4) 40Ni6Cr4Mo2 be substituted with BS 970 (Part 1) 817M40?
IS 1570 (Part 4) 40Ni6Cr4Mo2 and BS 970 (Part 1) 817M40 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.