Strong Match — 90.1% match
based on chemical composition and mechanical property overlap.
BS 970 EN40B (BS 970:1955) and BS 970 EN29B (BS 970:1955) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 EN40B is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN29B is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN40B vs BS 970 EN29B is a 85.2% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a strong match overall at 90.1%.
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 EN40B
BS 970 EN29B
Tensile Strength
≥695 MPa (45 tons/sq in, converted)
≥695 MPa (45 tons/sq in, converted)
Yield Strength
≥525 MPa (34 tons/sq in, converted)
≥525 MPa (34 tons/sq in, converted)
Elongation
≥22%
≥22%
Hardness
201-255 HB
201-255 HB
Condition
Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard)
Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard)
Can BS 970 EN40B Be Substituted With BS 970 EN29B?
BS 970 EN40B and BS 970 EN29B overlap closely enough on chemistry and mechanical properties that BS 970 EN29B is often considered as a substitute for BS 970 EN40B in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between BS 970 EN40B and BS 970 EN29B?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN40B be substituted with BS 970 EN29B?
BS 970 EN40B and BS 970 EN29B overlap closely enough on chemistry and mechanical properties that BS 970 EN29B is often considered as a substitute for BS 970 EN40B in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.