Related Material — 62.7% match
based on chemical composition and mechanical property overlap.
GOST 4543 30HN3A (GOST 4543-2016) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades.
Both fall under the Alloy Steel category.
GOST 4543 30HN3A is typically used for used for aircraft fittings, shafts, gears, spindles, and heavy 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 30HN3A vs GOST 4543 12HN3A is a 91.4% match.
As per mechanical properties, the match is 5.3%.
Combined, this makes them a related material overall at 62.7%.
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 30HN3A
GOST 4543 12HN3A
Tensile Strength
980-1180 MPa
850-1050 MPa
Yield Strength
835 MPa min
685 MPa min
Elongation
10% min
11% min
Hardness
285-352 HB
58-62 HRC (case)
Typical Applications
GOST 4543 30HN3A
Used for aircraft fittings, shafts, gears, spindles, and heavy machinery parts.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Can GOST 4543 30HN3A Be Substituted With GOST 4543 12HN3A?
GOST 4543 30HN3A 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 30HN3A and GOST 4543 12HN3A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GOST 4543 30HN3A be substituted with GOST 4543 12HN3A?
GOST 4543 30HN3A 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.