Strong Match — 88.6% match
based on chemical composition and mechanical property overlap.
ASTM A959 409Cb (ASTM A959:2011) and BS 970 (Part 1) 403S17 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A959 409Cb is typically used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1), while BS 970 (Part 1) 403S17 is commonly used for stainless and heat resisting steel for mechanical and allied engineering purposes (table 13)..
ASTM A959 409Cb is defined under ASTM International, originating from United States, while BS 970 (Part 1) 403S17 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, ASTM A959 409Cb vs BS 970 (Part 1) 403S17 is a 88.6% 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 88.6%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
ASTM A959 409Cb
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
BS 970 (Part 1) 403S17
Stainless and heat resisting steel for mechanical and allied engineering purposes (Table 13).
Can ASTM A959 409Cb Be Substituted With BS 970 (Part 1) 403S17?
ASTM A959 409Cb 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 ASTM A959 409Cb 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 ASTM A959 409Cb 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 ASTM A959 409Cb be substituted with BS 970 (Part 1) 403S17?
ASTM A959 409Cb 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 ASTM A959 409Cb in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.