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AISI 4140 vs GOST 4543 12HN3A

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

AISI 4140 and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. AISI 4140 is typically used for gears, shafts, dies, bolts, crankshafts, tooling, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. AISI 4140 is defined under AISI (United States).

As per chemical composition, AISI 4140 vs GOST 4543 12HN3A is a 60.7% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With AISI 4140:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
60.7%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property AISI 4140 GOST 4543 12HN3A
Standard AISI GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.09-0.16
Mn (%) 0.75–1.00 0.3-0.6
Cr (%) 0.80–1.10 0.6-0.9
Mo (%) 0.15–0.25 Not specified
Si (%) 0.15–0.35 0.17-0.37
S (%) ≤0.040 Not specified
P (%) ≤0.035 Not specified
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 4140 GOST 4543 12HN3A
Condition Quenched & Tempered Not specified
Tensile Strength 850–1000 MPa 850-1050 MPa
Yield Strength ≥680 MPa 685 MPa min
Elongation ≥13% 11% min
Hardness 248–302 HB 58-62 HRC (case)
Impact (Charpy) ≥54 J Not specified
Typical Applications
AISI 4140
Gears, shafts, dies, bolts, crankshafts, tooling
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can AISI 4140 Be Substituted With GOST 4543 12HN3A?
AISI 4140 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 4140
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5800–7000 mm (228.35–275.59 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 4140
3 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 4140 and GOST 4543 12HN3A?
AISI 4140 specifies Mo, S, P which are not specified for GOST 4543 12HN3A. GOST 4543 12HN3A specifies Ni which is not specified for AISI 4140.
Can AISI 4140 be substituted with GOST 4543 12HN3A?
AISI 4140 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.