Minimal Match — 47.4% match
based on chemical composition and mechanical property overlap.
GOST 4543 40XH (GOST 4543-2016) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades.
Both fall under the Alloy Steel category.
GOST 4543 40XH is typically used for heavy-duty gears, transmission shafts, axles, high-strength fasteners, forged machinery parts, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components..
As per chemical composition, GOST 4543 40XH vs GOST 4543 12HN3A is a 68.5% match.
As per mechanical properties, the match is 5.3%.
Combined, this makes them a minimal match overall at 47.4%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
GOST 4543 40XH
GOST 4543 12HN3A
Tensile Strength
980-1180 MPa
850-1050 MPa
Yield Strength
>=785 MPa
685 MPa min
Elongation
>=10%
11% min
Hardness
241-285 HB
58-62 HRC (case)
Typical Applications
GOST 4543 40XH
heavy-duty gears, transmission shafts, axles, high-strength fasteners, forged machinery parts
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
GOST 4543 40XH specifies S, P, Cu which are not specified for GOST 4543 12HN3A.
Can GOST 4543 40XH Be Substituted With GOST 4543 12HN3A?
GOST 4543 40XH 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 GOST 4543 40XH and GOST 4543 12HN3A?
GOST 4543 40XH specifies S, P, Cu which are not specified for GOST 4543 12HN3A.
Can GOST 4543 40XH be substituted with GOST 4543 12HN3A?
GOST 4543 40XH 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.