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BS 970 EN8K vs BS 970 (Part 3) 080M40

Strong Match — 96.7% match based on chemical composition and mechanical property overlap.

BS 970 EN8K (BS 970:1955) and BS 970 (Part 3) 080M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN8K is typically used for bars and billets for forging; forgings; bars for machining., while BS 970 (Part 3) 080M40 is commonly used for shafts, gears, axles, general engineering. BS 970 EN8K is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 080M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN8K vs BS 970 (Part 3) 080M40 is a 96.7% 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 96.7%.

Frequently Compared With BS 970 EN8K:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 045A10 BS 970 (Part 1) 060A40
Match Breakdown
CHEMISTRY MATCH
96.7%
MECHANICAL MATCH
No shared data
OVERALL
96.7%
Specifications
Property BS 970 EN8K BS 970 (Part 3) 080M40
Standard BS 970:1955 BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) 0.35-0.45 0.36-0.44
Si (%) 0.05-0.35 0.10-0.40
Mn (%) 0.60-1.00 0.60-1.00
S (%) <=0.050 <=0.05
P (%) <=0.050 <=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 EN8K BS 970 (Part 3) 080M40
Tensile Strength ≥541 MPa (35 tons/sq in, converted) Not specified
Yield Strength ≥278 MPa (18 tons/sq in, converted) Not specified
Elongation ≥20% Not specified
Hardness 152-207 HB Not specified
Condition Normalised, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN8K
Bars and billets for forging; forgings; bars for machining.
BS 970 (Part 3) 080M40
Shafts, gears, axles, general engineering
Can BS 970 EN8K Be Substituted With BS 970 (Part 3) 080M40?
BS 970 EN8K and BS 970 (Part 3) 080M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 080M40 is often considered as a substitute for BS 970 EN8K in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
BS 970 EN8K
No active listings currently.
BS 970 (Part 3) 080M40
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6000–6900 mm (236.22–271.65 in)
On M-EX Right Now
BS 970 EN8K
0 active listings and RFQs →
BS 970 (Part 3) 080M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN8K and BS 970 (Part 3) 080M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN8K be substituted with BS 970 (Part 3) 080M40?
BS 970 EN8K and BS 970 (Part 3) 080M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 080M40 is often considered as a substitute for BS 970 EN8K in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.