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BS 970 (Part 1) 905M39 vs BS 970 (Part 1) 708M40

Close Alternative — 79.1% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 905M39 (BS 970 (Part 1):1983) and BS 970 (Part 1) 708M40 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 905M39 is typically used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6., while BS 970 (Part 1) 708M40 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. BS 970 (Part 1) 905M39 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 708M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 905M39 vs BS 970 (Part 1) 708M40 is a 79.1% 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 79.1%.

Frequently Compared With BS 970 (Part 1) 905M39:
IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 10Cr20Mo6 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
79.1%
MECHANICAL MATCH
No shared data
OVERALL
79.1%
Specifications
Property BS 970 (Part 1) 905M39 BS 970 (Part 1) 708M40
Standard BS 970 (Part 1):1983 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.35-0.43 0.36-0.44
Mn (%) 0.40-0.65 0.70-1.00
P (%) <=0.025 <=0.035
S (%) <=0.025 <=0.040
Cr (%) 1.40-1.80 0.90-1.20
Mo (%) 0.15-0.25 0.15-0.25
Al (%) 0.90-1.30 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
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.
BS 970 (Part 1) 708M40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can BS 970 (Part 1) 905M39 Be Substituted With BS 970 (Part 1) 708M40?
BS 970 (Part 1) 905M39 and BS 970 (Part 1) 708M40 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.
On M-EX Right Now
BS 970 (Part 1) 905M39
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BS 970 (Part 1) 708M40
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 905M39 and BS 970 (Part 1) 708M40?
BS 970 (Part 1) 905M39 specifies Al which is not specified for BS 970 (Part 1) 708M40.
Can BS 970 (Part 1) 905M39 be substituted with BS 970 (Part 1) 708M40?
BS 970 (Part 1) 905M39 and BS 970 (Part 1) 708M40 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.