Close Alternative — 82.6% match
based on chemical composition and mechanical property overlap.
EN 10084 C10R (EN 10084:2008) and BS 970 (Part 1) 040A04 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
EN 10084 C10R is typically used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1), while BS 970 (Part 1) 040A04 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
EN 10084 C10R 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 10084 C10R vs BS 970 (Part 1) 040A04 is a 82.6% 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 82.6%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
EN 10084 C10R
BS 970 (Part 1) 040A04
Condition
Soft annealed
Not specified
Hardness
Soft annealed: 131 HB max
Not specified
Typical Applications
EN 10084 C10R
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
BS 970 (Part 1) 040A04
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
EN 10084 C10R specifies P, S, Si which are not specified for BS 970 (Part 1) 040A04.
Can EN 10084 C10R Be Substituted With BS 970 (Part 1) 040A04?
EN 10084 C10R and BS 970 (Part 1) 040A04 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 EN 10084 C10R and BS 970 (Part 1) 040A04?
EN 10084 C10R specifies P, S, Si which are not specified for BS 970 (Part 1) 040A04.
Can EN 10084 C10R be substituted with BS 970 (Part 1) 040A04?
EN 10084 C10R and BS 970 (Part 1) 040A04 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.