Strong Match — 97.6% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 3) 304S31 (BS 970 (Part 3):1991) and NF A35-574 Z7CN18-09 (NF A35-574:1990) are both steel grades.
Both fall under the Stainless Steel category.
BS 970 (Part 3) 304S31 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (table 18), while NF A35-574 Z7CN18-09 is commonly used for used for food processing equipment, kitchen equipment, chemical tanks, piping, architectural components, and fasteners..
BS 970 (Part 3) 304S31 is defined under British Standards (BS), originating from United Kingdom, while NF A35-574 Z7CN18-09 is defined under Association Francaise de Normalisation (NF), originating from France.
As per chemical composition, BS 970 (Part 3) 304S31 vs NF A35-574 Z7CN18-09 is a 97.6% 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 97.6%.
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 (Part 3) 304S31
NF A35-574 Z7CN18-09
Tensile Strength
Not specified
500-700 MPa
Yield Strength
Not specified
190-250 MPa
Elongation
Not specified
40-55%
Hardness
Not specified
140-210 HB
Typical Applications
BS 970 (Part 3) 304S31
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (Table 18)
NF A35-574 Z7CN18-09
Used for food processing equipment, kitchen equipment, chemical tanks, piping, architectural components, and fasteners.
Can BS 970 (Part 3) 304S31 Be Substituted With NF A35-574 Z7CN18-09?
BS 970 (Part 3) 304S31 and NF A35-574 Z7CN18-09 overlap closely enough on chemistry and mechanical properties that NF A35-574 Z7CN18-09 is often considered as a substitute for BS 970 (Part 3) 304S31 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 3) 304S31 and NF A35-574 Z7CN18-09?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 304S31 be substituted with NF A35-574 Z7CN18-09?
BS 970 (Part 3) 304S31 and NF A35-574 Z7CN18-09 overlap closely enough on chemistry and mechanical properties that NF A35-574 Z7CN18-09 is often considered as a substitute for BS 970 (Part 3) 304S31 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.