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BS 970 EN34 vs BS 970 (Part 1) 665M17

Strong Match — 90.3% match based on chemical composition and mechanical property overlap.

BS 970 EN34 (BS 970:1955) and BS 970 (Part 1) 665M17 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN34 is typically 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., while BS 970 (Part 1) 665M17 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. BS 970 EN34 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 665M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN34 vs BS 970 (Part 1) 665M17 is a 90.3% 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 90.3%.

Frequently Compared With BS 970 EN34:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 NF A35-565 100C6 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
90.3%
MECHANICAL MATCH
No shared data
OVERALL
90.3%
Specifications
Property BS 970 EN34 BS 970 (Part 1) 665M17
Standard BS 970:1955 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.14-0.20 0.14-0.20
Si (%) 0.10-0.35 Not specified
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 <=0.040
P (%) <=0.050 <=0.035
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 EN34 BS 970 (Part 1) 665M17
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Elongation ≥18% Not specified
Condition Core, after heat treatment (lowest-strength condition of the standard) Not specified
Typical Applications
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.
BS 970 (Part 1) 665M17
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can BS 970 EN34 Be Substituted With BS 970 (Part 1) 665M17?
BS 970 EN34 and BS 970 (Part 1) 665M17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 665M17 is often considered as a substitute for BS 970 EN34 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 EN34
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BS 970 (Part 1) 665M17
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Frequently Asked Questions
What is the difference between BS 970 EN34 and BS 970 (Part 1) 665M17?
BS 970 EN34 specifies Si which is not specified for BS 970 (Part 1) 665M17.
Can BS 970 EN34 be substituted with BS 970 (Part 1) 665M17?
BS 970 EN34 and BS 970 (Part 1) 665M17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 665M17 is often considered as a substitute for BS 970 EN34 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.