Strong Match — 99.7% match
based on chemical composition and mechanical property overlap.
BS 970 EN58A (BS 970:1955) and BS 970 EN58B (BS 970:1955) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 EN58A is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN58B is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN58A vs BS 970 EN58B is a 99.5% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a strong match overall at 99.7%.
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 EN58A
BS 970 EN58B
Tensile Strength
≥541 MPa (35 tons/sq in, converted)
≥541 MPa (35 tons/sq in, converted)
Yield Strength
≥185 MPa (12 tons/sq in, converted)
≥185 MPa (12 tons/sq in, converted)
Elongation
≥30%
≥30%
Condition
, ruling section 6 in (lowest-strength condition of the standard)
, ruling section 6 in (lowest-strength condition of the standard)
Typical Applications
BS 970 EN58A
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for tensile strength of 35 tons/sq in min.
BS 970 EN58B
Not documented
Can BS 970 EN58A Be Substituted With BS 970 EN58B?
BS 970 EN58A and BS 970 EN58B overlap closely enough on chemistry and mechanical properties that BS 970 EN58B is often considered as a substitute for BS 970 EN58A 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 EN58A and BS 970 EN58B?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN58A be substituted with BS 970 EN58B?
BS 970 EN58A and BS 970 EN58B overlap closely enough on chemistry and mechanical properties that BS 970 EN58B is often considered as a substitute for BS 970 EN58A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.