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BS 970 (Part 3) 815M17 vs BS 970 (Part 1) 815H17

Strong Match — 89.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 815M17 (BS 970 (Part 3):1991) and BS 970 (Part 1) 815H17 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 3) 815M17 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15), while BS 970 (Part 1) 815H17 is commonly used for case hardening steel (section four). BS 970 (Part 3) 815M17 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 815H17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 3) 815M17 vs BS 970 (Part 1) 815H17 is a 89.9% 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 89.9%.

Frequently Compared With BS 970 (Part 3) 815M17:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 NF A35-565 100C6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H UNI 11234 100Cr6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 105Cr5
Match Breakdown
CHEMISTRY MATCH
89.9%
MECHANICAL MATCH
No shared data
OVERALL
89.9%
Specifications
Property BS 970 (Part 3) 815M17 BS 970 (Part 1) 815H17
Standard BS 970 (Part 3):1991 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.14-0.20 0.14-0.20
Si (%) 0.10-0.40 Not specified
Mn (%) 0.60-0.90 0.80-0.90
Cr (%) 0.80-1.20 0.80-1.20
Mo (%) 0.10-0.20 0.10-0.20
Ni (%) 1.20-1.70 1.20-1.70
P (%) <=0.04 Not specified
S (%) <=0.05 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 3) 815M17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
BS 970 (Part 1) 815H17
Case hardening steel (section four)
Key Differences
Can BS 970 (Part 3) 815M17 Be Substituted With BS 970 (Part 1) 815H17?
BS 970 (Part 3) 815M17 and BS 970 (Part 1) 815H17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 815H17 is often considered as a substitute for BS 970 (Part 3) 815M17 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 3) 815M17
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BS 970 (Part 1) 815H17
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 815M17 and BS 970 (Part 1) 815H17?
BS 970 (Part 3) 815M17 specifies Si, P, S which are not specified for BS 970 (Part 1) 815H17.
Can BS 970 (Part 3) 815M17 be substituted with BS 970 (Part 1) 815H17?
BS 970 (Part 3) 815M17 and BS 970 (Part 1) 815H17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 815H17 is often considered as a substitute for BS 970 (Part 3) 815M17 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.