Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
EN 10083-2 C40R (EN 10083-2:2006) and BS 970 (Part 1) 040A04 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
EN 10083-2 C40R is typically used for quenched and tempered, flame or induction hardened machine parts; can also be used normalized (clause 1), while BS 970 (Part 1) 040A04 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
EN 10083-2 C40R is defined under European Standard (EN), originating from Europe, while BS 970 (Part 1) 040A04 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, EN 10083-2 C40R vs BS 970 (Part 1) 040A04 is a 58.6% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a minimal match overall at 35%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
EN 10083-2 C40R
BS 970 (Part 1) 040A04
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Not specified
Elongation
16% min
Not specified
Tensile Strength
650 to 800 MPa
Not specified
Yield Strength
460 MPa min
Not specified
Typical Applications
EN 10083-2 C40R
Quenched and tempered, flame or induction hardened machine parts; can also be used normalized (clause 1)
BS 970 (Part 1) 040A04
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
EN 10083-2 C40R specifies Cr, Cr+Mo+Ni, Mo, Ni which are not specified for BS 970 (Part 1) 040A04.
Can EN 10083-2 C40R Be Substituted With BS 970 (Part 1) 040A04?
EN 10083-2 C40R and BS 970 (Part 1) 040A04 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 EN 10083-2 C40R and BS 970 (Part 1) 040A04?
EN 10083-2 C40R specifies Cr, Cr+Mo+Ni, Mo, Ni which are not specified for BS 970 (Part 1) 040A04.
Can EN 10083-2 C40R be substituted with BS 970 (Part 1) 040A04?
EN 10083-2 C40R and BS 970 (Part 1) 040A04 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.