Strong Match — 90.6% match
based on chemical composition and mechanical property overlap.
BS 970 EN56A (BS 970:1955) and ASTM A959 S40800 (ASTM A959:2011) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 EN56A is defined under British Standards (BS), originating from United Kingdom, while ASTM A959 S40800 is defined under ASTM International, originating from United States.
As per chemical composition, BS 970 EN56A vs ASTM A959 S40800 is a 90.6% 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 90.6%.
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 EN56A
ASTM A959 S40800
Tensile Strength
≥541 MPa (35 tons/sq in, converted)
Not specified
Yield Strength
≥386 MPa (25 tons/sq in, converted)
Not specified
Elongation
≥25%
Not specified
Hardness
152-207 HB
Not specified
Condition
Hardened and tempered P (ruling 6), ruling section 6 in (lowest-strength condition of the standard)
Not specified
Typical Applications
BS 970 EN56A
Not documented
ASTM A959 S40800
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can BS 970 EN56A Be Substituted With ASTM A959 S40800?
BS 970 EN56A and ASTM A959 S40800 overlap closely enough on chemistry and mechanical properties that ASTM A959 S40800 is often considered as a substitute for BS 970 EN56A 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 EN56A and ASTM A959 S40800?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN56A be substituted with ASTM A959 S40800?
BS 970 EN56A and ASTM A959 S40800 overlap closely enough on chemistry and mechanical properties that ASTM A959 S40800 is often considered as a substitute for BS 970 EN56A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.