Minimal Match — 53.9% match
based on chemical composition and mechanical property overlap.
JIS G4051 S20C (JIS G4051:2009) and BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
JIS G4051 S20C is typically used for shafts, pins, keys, lightly stressed components, while BS 970 (Part 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
JIS G4051 S20C is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 055M15 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, JIS G4051 S20C vs BS 970 (Part 1) 055M15 is a 80.9% match.
As per mechanical properties, the match is 0%.
Combined, this makes them a minimal match overall at 53.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
JIS G4051 S20C
BS 970 (Part 1) 055M15
Tensile Strength
>=440 MPa
310 MPa min
Elongation
>=23%
25 % min
Hardness
<=149 HB
121 HB min
Condition
Not specified
As-rolled
Typical Applications
JIS G4051 S20C
Shafts, pins, keys, lightly stressed components
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
JIS G4051 S20C specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can JIS G4051 S20C Be Substituted With BS 970 (Part 1) 055M15?
JIS G4051 S20C 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 JIS G4051 S20C and BS 970 (Part 1) 055M15?
JIS G4051 S20C specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can JIS G4051 S20C be substituted with BS 970 (Part 1) 055M15?
JIS G4051 S20C 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.