Related Material — 69.9% match
based on chemical composition and mechanical property overlap.
ASTM A240/A240M S32900 (ASTM A240/A240M:2025) and BS 970 (Part 3) 320S31 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Stainless Steel category.
ASTM A240/A240M S32900 is typically used for pressure vessels and general applications (plate, sheet and strip), while BS 970 (Part 3) 320S31 is commonly 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).
ASTM A240/A240M S32900 is defined under ASTM International, originating from United States, while BS 970 (Part 3) 320S31 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, ASTM A240/A240M S32900 vs BS 970 (Part 3) 320S31 is a 70.5% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a related material overall at 69.9%.
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 S32900
BS 970 (Part 3) 320S31
Tensile Strength
>=620 MPa
Not specified
Yield Strength
>=485 MPa
Not specified
Elongation
>=15%
Not specified
Hardness
<=269 HB
Not specified
Condition
Plate, sheet and strip; yield by 0.2 percent offset
Not specified
Typical Applications
ASTM A240/A240M S32900
Pressure vessels and general applications (plate, sheet and strip)
BS 970 (Part 3) 320S31
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)
Can ASTM A240/A240M S32900 Be Substituted With BS 970 (Part 3) 320S31?
ASTM A240/A240M S32900 and BS 970 (Part 3) 320S31 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
What is the difference between ASTM A240/A240M S32900 and BS 970 (Part 3) 320S31?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S32900 be substituted with BS 970 (Part 3) 320S31?
ASTM A240/A240M S32900 and BS 970 (Part 3) 320S31 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.