Strong Match — 95.3% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 1) 403S17 (BS 970 (Part 1):1983) and ASTM A240/A240M S41008 (ASTM A240/A240M:2025) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 1) 403S17 is typically used for stainless and heat resisting steel for mechanical and allied engineering purposes (table 13)., while ASTM A240/A240M S41008 is commonly used for pressure vessels and general applications (plate, sheet and strip).
BS 970 (Part 1) 403S17 is defined under British Standards (BS), originating from United Kingdom, while ASTM A240/A240M S41008 is defined under ASTM International, originating from United States.
As per chemical composition, BS 970 (Part 1) 403S17 vs ASTM A240/A240M S41008 is a 95.3% 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 95.3%.
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 (Part 1) 403S17
ASTM A240/A240M S41008
Tensile Strength
Not specified
>=415 MPa
Yield Strength
Not specified
>=205 MPa
Elongation
Not specified
>=22%
Hardness
Not specified
<=183 HB
Condition
Not specified
Plate, sheet and strip; yield by 0.2 percent offset
Typical Applications
BS 970 (Part 1) 403S17
Stainless and heat resisting steel for mechanical and allied engineering purposes (Table 13).
ASTM A240/A240M S41008
Pressure vessels and general applications (plate, sheet and strip)
Can BS 970 (Part 1) 403S17 Be Substituted With ASTM A240/A240M S41008?
BS 970 (Part 1) 403S17 and ASTM A240/A240M S41008 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S41008 is often considered as a substitute for BS 970 (Part 1) 403S17 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 (Part 1) 403S17 and ASTM A240/A240M S41008?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 403S17 be substituted with ASTM A240/A240M S41008?
BS 970 (Part 1) 403S17 and ASTM A240/A240M S41008 overlap closely enough on chemistry and mechanical properties that ASTM A240/A240M S41008 is often considered as a substitute for BS 970 (Part 1) 403S17 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.