Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
EN 10083-1 3C40 (EN 10083-1:1991) and BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
EN 10083-1 3C40 is typically used for quenched and tempered machine parts; non alloy steels also normalized (clause 1), while BS 970 (Part 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
EN 10083-1 3C40 is defined under European Standard (EN), originating from Europe, while BS 970 (Part 1) 055M15 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, EN 10083-1 3C40 vs BS 970 (Part 1) 055M15 is a 61% match.
As per mechanical properties, the match is 0%.
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 10083-1 3C40
BS 970 (Part 1) 055M15
Condition
Quenched and tempered, ruling section d <= 16 mm
As-rolled
Elongation
16% min
25 % min
Tensile Strength
650 to 800 MPa
310 MPa min
Yield Strength
460 MPa min
Not specified
Hardness
Not specified
121 HB min
Typical Applications
EN 10083-1 3C40
Quenched and tempered machine parts; non alloy steels also normalized (clause 1)
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
EN 10083-1 3C40 specifies Cr, Cr+Mo+Ni, Mo, Ni which are not specified for BS 970 (Part 1) 055M15.
Can EN 10083-1 3C40 Be Substituted With BS 970 (Part 1) 055M15?
EN 10083-1 3C40 and BS 970 (Part 1) 055M15 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 10083-1 3C40 and BS 970 (Part 1) 055M15?
EN 10083-1 3C40 specifies Cr, Cr+Mo+Ni, Mo, Ni which are not specified for BS 970 (Part 1) 055M15.
Can EN 10083-1 3C40 be substituted with BS 970 (Part 1) 055M15?
EN 10083-1 3C40 and BS 970 (Part 1) 055M15 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.