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BS 970 (Part 1) 905M39 vs IS 5517 40Cr7Al10Mo2

Close Alternative — 85% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 905M39 (BS 970 (Part 1):1983) and IS 5517 40Cr7Al10Mo2 (IS 5517:1993) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 905M39 is defined under British Standards (BS), originating from United Kingdom, while IS 5517 40Cr7Al10Mo2 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 (Part 1) 905M39 vs IS 5517 40Cr7Al10Mo2 is a 85% 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 85%.

Frequently Compared With BS 970 (Part 1) 905M39:
IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
85%
MECHANICAL MATCH
No shared data
OVERALL
85%
Specifications
Property BS 970 (Part 1) 905M39 IS 5517 40Cr7Al10Mo2
Standard BS 970 (Part 1):1983 IS 5517:1993
Category Alloy Steel Alloy Steel
C (%) 0.35-0.43 0.35-0.45
Mn (%) 0.40-0.65 0.40-0.70
P (%) <=0.025 <=0.035
S (%) <=0.025 <=0.035
Cr (%) 1.40-1.80 1.50-1.80
Mo (%) 0.15-0.25 0.10-0.25
Al (%) 0.90-1.30 0.90-1.30
Si (%) Not specified 0.10-0.35
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 1) 905M39 IS 5517 40Cr7Al10Mo2
Tensile Strength Not specified 700-850 MPa
Yield Strength (0.2% proof) Not specified 540 MPa min
Elongation Not specified >=18%
Izod Impact Not specified 55 J min
Hardness (annealed) Not specified <=230 HB
Condition Not specified Hardened and tempered, ruling section up to 150 mm
Typical Applications
BS 970 (Part 1) 905M39
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
IS 5517 40Cr7Al10Mo2
Not documented
Key Differences
Can BS 970 (Part 1) 905M39 Be Substituted With IS 5517 40Cr7Al10Mo2?
BS 970 (Part 1) 905M39 and IS 5517 40Cr7Al10Mo2 overlap closely enough on chemistry and mechanical properties that IS 5517 40Cr7Al10Mo2 is often considered as a substitute for BS 970 (Part 1) 905M39 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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BS 970 (Part 1) 905M39
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IS 5517 40Cr7Al10Mo2
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 905M39 and IS 5517 40Cr7Al10Mo2?
IS 5517 40Cr7Al10Mo2 specifies Si which is not specified for BS 970 (Part 1) 905M39.
Can BS 970 (Part 1) 905M39 be substituted with IS 5517 40Cr7Al10Mo2?
BS 970 (Part 1) 905M39 and IS 5517 40Cr7Al10Mo2 overlap closely enough on chemistry and mechanical properties that IS 5517 40Cr7Al10Mo2 is often considered as a substitute for BS 970 (Part 1) 905M39 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.