Strong Match — 91.8% match
based on chemical composition and mechanical property overlap.
BS 970 EN56A (BS 970:1955) and BS 970 (Part 1) 403S17 (BS 970 (Part 1):1983) 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 BS 970 (Part 1) 403S17 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN56A vs BS 970 (Part 1) 403S17 is a 91.8% 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 91.8%.
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
BS 970 (Part 1) 403S17
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
BS 970 (Part 1) 403S17
Stainless and heat resisting steel for mechanical and allied engineering purposes (Table 13).
Can BS 970 EN56A Be Substituted With BS 970 (Part 1) 403S17?
BS 970 EN56A and BS 970 (Part 1) 403S17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 403S17 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 BS 970 (Part 1) 403S17?
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 BS 970 (Part 1) 403S17?
BS 970 EN56A and BS 970 (Part 1) 403S17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 403S17 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.