Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
NF A35-565 18NCD4 and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades.
Both fall under the Alloy Steel category.
NF A35-565 18NCD4 is typically used for used for gears, aerospace shafts, pinions, transmission components, heavy-duty bearings, and carburized mechanical parts., while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components..
NF A35-565 18NCD4 is defined under Association Francaise de Normalisation (NF) (France).
As per chemical composition, NF A35-565 18NCD4 vs GOST 4543 12HN3A is a 59% match.
As per mechanical properties, the match is 45%.
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
NF A35-565 18NCD4
GOST 4543 12HN3A
Tensile Strength
850-1100 MPa
850-1050 MPa
Yield Strength
650-850 MPa
685 MPa min
Elongation
10-16%
11% min
Hardness
58-62 HRC (case)
58-62 HRC (case)
Typical Applications
NF A35-565 18NCD4
Used for gears, aerospace shafts, pinions, transmission components, heavy-duty bearings, and carburized mechanical parts.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
NF A35-565 18NCD4 specifies Mo, P, S which are not specified for GOST 4543 12HN3A.
Can NF A35-565 18NCD4 Be Substituted With GOST 4543 12HN3A?
NF A35-565 18NCD4 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 NF A35-565 18NCD4 and GOST 4543 12HN3A?
NF A35-565 18NCD4 specifies Mo, P, S which are not specified for GOST 4543 12HN3A.
Can NF A35-565 18NCD4 be substituted with GOST 4543 12HN3A?
NF A35-565 18NCD4 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.