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BS 970 EN4 vs BS 970 (Part 3) 045M10

Strong Match — 86.6% match based on chemical composition and mechanical property overlap.

BS 970 EN4 (BS 970:1955) and BS 970 (Part 3) 045M10 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN4 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). suitable for a tensile range of 28/38 tons/sq in., while BS 970 (Part 3) 045M10 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; case hardening steel, carbon and carbon manganese (table 14). BS 970 EN4 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 045M10 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN4 vs BS 970 (Part 3) 045M10 is a 86.6% 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 86.6%.

Frequently Compared With BS 970 EN4:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 060A40 BS 970 (Part 1) 060A45 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 070M20
Match Breakdown
CHEMISTRY MATCH
86.6%
MECHANICAL MATCH
No shared data
OVERALL
86.6%
Specifications
Property BS 970 EN4 BS 970 (Part 3) 045M10
Standard BS 970:1955 BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) <=0.30 0.07-0.13
Si (%) 0.05-0.35 0.10-0.40
Mn (%) <=1.00 0.30-0.60
S (%) <=0.060 <=0.05
P (%) <=0.060 <=0.05
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 EN4 BS 970 (Part 3) 045M10
Tensile Strength 432-587 MPa (28-38 tons/sq in, converted) Not specified
Elongation ≥25% Not specified
Hardness 126-179 HB Not specified
Condition ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN4
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). Suitable for a tensile range of 28/38 tons/sq in.
BS 970 (Part 3) 045M10
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; case hardening steel, carbon and carbon manganese (Table 14)
Can BS 970 EN4 Be Substituted With BS 970 (Part 3) 045M10?
BS 970 EN4 and BS 970 (Part 3) 045M10 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 045M10 is often considered as a substitute for BS 970 EN4 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 EN4
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BS 970 (Part 3) 045M10
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Frequently Asked Questions
What is the difference between BS 970 EN4 and BS 970 (Part 3) 045M10?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN4 be substituted with BS 970 (Part 3) 045M10?
BS 970 EN4 and BS 970 (Part 3) 045M10 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 045M10 is often considered as a substitute for BS 970 EN4 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.