Close Alternative — 84.6% match
based on chemical composition and mechanical property overlap.
ASTM A240/A240M S44200 (ASTM A240/A240M:2025) and BS 970 (Part 3) 430S17 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A240/A240M S44200 is typically used for pressure vessels and general applications (plate, sheet and strip), while BS 970 (Part 3) 430S17 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; ferritic stainless steel (table 17).
ASTM A240/A240M S44200 is defined under ASTM International, originating from United States, while BS 970 (Part 3) 430S17 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, ASTM A240/A240M S44200 vs BS 970 (Part 3) 430S17 is a 84.6% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a close alternative overall at 84.6%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
ASTM A240/A240M S44200
BS 970 (Part 3) 430S17
Tensile Strength
>=515 MPa
Not specified
Yield Strength
>=275 MPa
Not specified
Elongation
>=20%
Not specified
Hardness
<=217 HB
Not specified
Condition
Plate, sheet and strip; yield by 0.2 percent offset
Not specified
Typical Applications
ASTM A240/A240M S44200
Pressure vessels and general applications (plate, sheet and strip)
BS 970 (Part 3) 430S17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; ferritic stainless steel (Table 17)
Can ASTM A240/A240M S44200 Be Substituted With BS 970 (Part 3) 430S17?
ASTM A240/A240M S44200 and BS 970 (Part 3) 430S17 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
What is the difference between ASTM A240/A240M S44200 and BS 970 (Part 3) 430S17?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S44200 be substituted with BS 970 (Part 3) 430S17?
ASTM A240/A240M S44200 and BS 970 (Part 3) 430S17 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.