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BS 970 EN35 vs BS 970 (Part 3) 665M17

Strong Match — 87.4% match based on chemical composition and mechanical property overlap.

BS 970 EN35 (BS 970:1955) and BS 970 (Part 3) 665M17 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN35 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. en 35 suitable for tensile strength of 55 tons/sq in min. en 35a and 35b: special applications, composition only (mechanical properties not part of contractual obligations)., while BS 970 (Part 3) 665M17 is commonly 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). BS 970 EN35 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 665M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN35 vs BS 970 (Part 3) 665M17 is a 87.4% 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 87.4%.

Frequently Compared With BS 970 EN35:
IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
87.4%
MECHANICAL MATCH
No shared data
OVERALL
87.4%
Specifications
Property BS 970 EN35 BS 970 (Part 3) 665M17
Standard BS 970:1955 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.20-0.28 0.14-0.20
Si (%) 0.10-0.35 0.10-0.40
Mn (%) 0.30-0.60 0.35-0.75
Ni (%) 1.50-2.00 1.50-2.00
Mo (%) 0.20-0.30 0.20-0.30
S (%) <=0.050 <=0.05
P (%) <=0.050 <=0.04
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 EN35 BS 970 (Part 3) 665M17
Tensile Strength ≥849 MPa (55 tons/sq in, converted) Not specified
Elongation ≥15% Not specified
Condition Core, after heat treatment (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN35
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. En 35 suitable for tensile strength of 55 tons/sq in min. En 35A and 35B: special applications, composition only (mechanical properties not part of contractual obligations).
BS 970 (Part 3) 665M17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Can BS 970 EN35 Be Substituted With BS 970 (Part 3) 665M17?
BS 970 EN35 and BS 970 (Part 3) 665M17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 665M17 is often considered as a substitute for BS 970 EN35 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 EN35
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BS 970 (Part 3) 665M17
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Frequently Asked Questions
What is the difference between BS 970 EN35 and BS 970 (Part 3) 665M17?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN35 be substituted with BS 970 (Part 3) 665M17?
BS 970 EN35 and BS 970 (Part 3) 665M17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 665M17 is often considered as a substitute for BS 970 EN35 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.