Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
BS 970 EN41B (BS 970:1955) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 EN41B is typically used for nitrided gears, crankshafts, cylinder liners, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components..
BS 970 EN41B is defined under British Standards (BS) (United Kingdom).
As per chemical composition, BS 970 EN41B vs GOST 4543 12HN3A is a 57.3% 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
BS 970 EN41B
GOST 4543 12HN3A
Tensile Strength
≥695 MPa (45 tons/sq in, converted)
850-1050 MPa
Yield Strength
≥525 MPa (34 tons/sq in, converted)
685 MPa min
Elongation
≥20%
11% min
Hardness
201-255 HB
58-62 HRC (case)
Condition
Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard)
Not specified
Typical Applications
BS 970 EN41B
Nitrided gears, crankshafts, cylinder liners
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
BS 970 EN41B specifies Mo, Al, S, P which are not specified for GOST 4543 12HN3A.
Can BS 970 EN41B Be Substituted With GOST 4543 12HN3A?
BS 970 EN41B and GOST 4543 12HN3A 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 BS 970 EN41B and GOST 4543 12HN3A?
BS 970 EN41B specifies Mo, Al, S, P which are not specified for GOST 4543 12HN3A.
Can BS 970 EN41B be substituted with GOST 4543 12HN3A?
BS 970 EN41B and GOST 4543 12HN3A 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.