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AISI 5120 vs GOST 4543 12HN3A

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

AISI 5120 and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. AISI 5120 is typically used for case hardened gears, pins, shafts, cams, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. AISI 5120 is defined under AISI (United States).

As per chemical composition, AISI 5120 vs GOST 4543 12HN3A is a 73.2% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With AISI 5120:
GB/T 3077 12Cr2Ni4A UNI 11234 100Cr6 NF A35-565 100C6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr4 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
73.2%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property AISI 5120 GOST 4543 12HN3A
Standard AISI GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.17–0.22 0.09-0.16
Mn (%) 0.70–0.90 0.3-0.6
Cr (%) 0.70–0.90 0.6-0.9
Si (%) 0.15–0.35 0.17-0.37
Ni (%) Not specified 2.75-3.15
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 5120 GOST 4543 12HN3A
Condition Carburized & Case Hardened Not specified
Tensile Strength 750–950 MPa 850-1050 MPa
Case Hardness HRC 58–62 Not specified
Core Hardness HB 207–269 Not specified
Yield Strength Not specified 685 MPa min
Elongation Not specified 11% min
Hardness Not specified 58-62 HRC (case)
Typical Applications
AISI 5120
Case hardened gears, pins, shafts, cams
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can AISI 5120 Be Substituted With GOST 4543 12HN3A?
AISI 5120 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.
Forms & Sizes Available on M-EX
AISI 5120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5100–6500 mm (200.79–255.91 in)
GOST 4543 12HN3A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6600 mm (220.47–259.84 in)
On M-EX Right Now
AISI 5120
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 5120 and GOST 4543 12HN3A?
GOST 4543 12HN3A specifies Ni which is not specified for AISI 5120.
Can AISI 5120 be substituted with GOST 4543 12HN3A?
AISI 5120 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.