Close Alternative — 84.9% match
based on chemical composition and mechanical property overlap.
BS 970 EN18A (BS 970:1955) and BS 970 EN18D (BS 970:1955) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 EN18A is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN18D is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN18A vs BS 970 EN18D is a 91.4% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a close alternative overall at 84.9%.
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 EN18A
BS 970 EN18D
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 4 in (lowest-strength condition of the standard)
Hardened and tempered R, ruling section 4 in (lowest-strength condition of the standard)
Can BS 970 EN18A Be Substituted With BS 970 EN18D?
BS 970 EN18A and BS 970 EN18D are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
What is the difference between BS 970 EN18A and BS 970 EN18D?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN18A be substituted with BS 970 EN18D?
BS 970 EN18A and BS 970 EN18D are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.