Strong Match — 99.4% match
based on chemical composition and mechanical property overlap.
BS 970 EN9 (BS 970:1955) and BS 970 EN9K (BS 970:1955) are both steel grades.
Both fall under the Carbon Steel category.
BS 970 EN9 is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN9K is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN9 vs BS 970 EN9K is a 99% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a strong match overall at 99.4%.
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 EN9
BS 970 EN9K
Tensile Strength
≥695 MPa (45 tons/sq in, converted)
≥695 MPa (45 tons/sq in, converted)
Yield Strength
≥355 MPa (23 tons/sq in, converted)
≥355 MPa (23 tons/sq in, converted)
Elongation
≥18%
≥18%
Hardness
201-255 HB
201-255 HB
Condition
Normalised, ruling section 4 in (lowest-strength condition of the standard)
Normalised, ruling section 4 in (lowest-strength condition of the standard)
Typical Applications
BS 970 EN9
Springs, chisels, punches, dies
BS 970 EN9K
Not documented
Can BS 970 EN9 Be Substituted With BS 970 EN9K?
BS 970 EN9 and BS 970 EN9K overlap closely enough on chemistry and mechanical properties that BS 970 EN9K is often considered as a substitute for BS 970 EN9 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 EN9 and BS 970 EN9K?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN9 be substituted with BS 970 EN9K?
BS 970 EN9 and BS 970 EN9K overlap closely enough on chemistry and mechanical properties that BS 970 EN9K is often considered as a substitute for BS 970 EN9 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.