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BS 970 (Part 3) 665M17 vs BS 970 EN34

Strong Match — 95.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 665M17 (BS 970 (Part 3):1991) and BS 970 EN34 (BS 970:1955) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 3) 665M17 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 EN34 is commonly used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for tensile strength of 45 tons/sq in min.. BS 970 (Part 3) 665M17 is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN34 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 3) 665M17 vs BS 970 EN34 is a 95.9% 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 95.9%.

Frequently Compared With BS 970 (Part 3) 665M17:
IS 1570 (Part 4) 105Cr5 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 10Ni5Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
95.9%
MECHANICAL MATCH
No shared data
OVERALL
95.9%
Specifications
Property BS 970 (Part 3) 665M17 BS 970 EN34
Standard BS 970 (Part 3):1991 BS 970:1955
Category Alloy Steel Alloy Steel
C (%) 0.14-0.20 0.14-0.20
Si (%) 0.10-0.40 0.10-0.35
Mn (%) 0.35-0.75 0.30-0.60
Mo (%) 0.20-0.30 0.20-0.30
Ni (%) 1.50-2.00 1.50-2.00
P (%) <=0.04 <=0.050
S (%) <=0.05 <=0.050
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 3) 665M17 BS 970 EN34
Tensile Strength Not specified ≥695 MPa (45 tons/sq in, converted)
Elongation Not specified ≥18%
Condition Not specified Core, after heat treatment (lowest-strength condition of the standard)
Typical Applications
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)
BS 970 EN34
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for tensile strength of 45 tons/sq in min.
Can BS 970 (Part 3) 665M17 Be Substituted With BS 970 EN34?
BS 970 (Part 3) 665M17 and BS 970 EN34 overlap closely enough on chemistry and mechanical properties that BS 970 EN34 is often considered as a substitute for BS 970 (Part 3) 665M17 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) 665M17
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BS 970 EN34
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 665M17 and BS 970 EN34?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 665M17 be substituted with BS 970 EN34?
BS 970 (Part 3) 665M17 and BS 970 EN34 overlap closely enough on chemistry and mechanical properties that BS 970 EN34 is often considered as a substitute for BS 970 (Part 3) 665M17 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.