Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
AISI 5140 and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades.
Both fall under the Alloy Steel category.
AISI 5140 is typically used for used for gears, shafts, spindles, bolts, machinery parts, and automotive components., while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components..
AISI 5140 is defined under AISI (United States).
As per chemical composition, AISI 5140 vs GOST 4543 12HN3A is a 71.8% match.
As per mechanical properties, the match is 18.8%.
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
AISI 5140
GOST 4543 12HN3A
Condition
Quenched & Tempered
Not specified
Tensile Strength
850-1000 MPa
850-1050 MPa
Yield Strength
650-800 MPa
685 MPa min
Elongation
12-18%
11% min
Hardness
240-300 HB
58-62 HRC (case)
Typical Applications
AISI 5140
Used for gears, shafts, spindles, bolts, machinery parts, and automotive components.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
AISI 5140 specifies P, S which are not specified for GOST 4543 12HN3A.
GOST 4543 12HN3A specifies Ni which is not specified for AISI 5140.
Can AISI 5140 Be Substituted With GOST 4543 12HN3A?
AISI 5140 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 AISI 5140 and GOST 4543 12HN3A?
AISI 5140 specifies P, S which are not specified for GOST 4543 12HN3A. GOST 4543 12HN3A specifies Ni which is not specified for AISI 5140.
Can AISI 5140 be substituted with GOST 4543 12HN3A?
AISI 5140 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.