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BS 970 (Part 1) 185H40 vs BS 970 (Part 1) 905M39

Related Material — 69.6% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 185H40 (BS 970 (Part 1):1983) and BS 970 (Part 1) 905M39 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 185H40 is typically used for through hardening steel for mechanical and allied engineering purposes (table 6 gives composition only; see the hardenability tables)., while BS 970 (Part 1) 905M39 is commonly used for steel for surface hardening by nitriding (section three). BS 970 (Part 1) 185H40 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 905M39 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 185H40 vs BS 970 (Part 1) 905M39 is a 69.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.6%.

Frequently Compared With BS 970 (Part 1) 185H40:
NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 11169 (Part 1) 10Ni5Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
69.6%
MECHANICAL MATCH
No shared data
OVERALL
69.6%
Specifications
Property BS 970 (Part 1) 185H40 BS 970 (Part 1) 905M39
Standard BS 970 (Part 1):1983 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.36-0.43 0.35-0.43
Mn (%) 1.25-1.75 0.40-0.65
S (%) 0.03-0.06 Not specified
Cr (%) 0.15-0.35 1.40-1.80
Mo (%) 0.08-0.18 0.15-0.25
B (%) 0.0005-0.005 Not specified
P (%) <=0.035 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) 185H40
Through hardening steel for mechanical and allied engineering purposes (Table 6 gives composition only; see the hardenability tables).
BS 970 (Part 1) 905M39
Steel for surface hardening by nitriding (section three)
Key Differences
Can BS 970 (Part 1) 185H40 Be Substituted With BS 970 (Part 1) 905M39?
BS 970 (Part 1) 185H40 and BS 970 (Part 1) 905M39 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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BS 970 (Part 1) 185H40
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BS 970 (Part 1) 905M39
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 185H40 and BS 970 (Part 1) 905M39?
BS 970 (Part 1) 185H40 specifies S, B, P which are not specified for BS 970 (Part 1) 905M39.
Can BS 970 (Part 1) 185H40 be substituted with BS 970 (Part 1) 905M39?
BS 970 (Part 1) 185H40 and BS 970 (Part 1) 905M39 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.