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BS 970 EN15B vs BS 970 (Part 3) 080M40

Strong Match — 86.9% match based on chemical composition and mechanical property overlap.

BS 970 EN15B (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 EN15B is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for 40/50 (q), 45/55 (r), 50/60 (s), 55/65 (t) tons/sq in according to ruling section., while BS 970 (Part 3) 080M40 is commonly used for shafts, gears, axles, general engineering. BS 970 EN15B 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 EN15B vs BS 970 (Part 3) 080M40 is a 86.9% 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 86.9%.

Frequently Compared With BS 970 EN15B:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 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) 060A40
Match Breakdown
CHEMISTRY MATCH
86.9%
MECHANICAL MATCH
No shared data
OVERALL
86.9%
Specifications
Property BS 970 EN15B BS 970 (Part 3) 080M40
Standard BS 970:1955 BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) 0.35-0.40 0.36-0.44
Si (%) 0.05-0.35 0.10-0.40
Mn (%) 1.10-1.30 0.60-1.00
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 EN15B BS 970 (Part 3) 080M40
Tensile Strength ≥618 MPa (40 tons/sq in, converted) Not specified
Yield Strength ≥402 MPa (26 tons/sq in, converted) Not specified
Elongation ≥20% Not specified
Hardness 179-229 HB Not specified
Condition Hardened and tempered Q, ruling section 4 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN15B
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 40/50 (Q), 45/55 (R), 50/60 (S), 55/65 (T) tons/sq in according to ruling section.
BS 970 (Part 3) 080M40
Shafts, gears, axles, general engineering
Can BS 970 EN15B Be Substituted With BS 970 (Part 3) 080M40?
BS 970 EN15B 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 EN15B 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 EN15B
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 EN15B
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 EN15B 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 EN15B be substituted with BS 970 (Part 3) 080M40?
BS 970 EN15B 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 EN15B in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.