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GOST 4543 40HFA vs GOST 4543 12HN3A

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

GOST 4543 40HFA (GOST 4543-2016) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 40HFA is typically used for used for springs, shafts, gears, fasteners, and aircraft structural components., while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components..

As per chemical composition, GOST 4543 40HFA vs GOST 4543 12HN3A is a 65.7% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GOST 4543 40HFA:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
65.7%
MECHANICAL MATCH
33.3%
OVERALL
35%
Specifications
Property GOST 4543 40HFA GOST 4543 12HN3A
Standard GOST 4543-2016 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.09-0.16
Cr (%) 0.8-1.1 0.6-0.9
V (%) 0.1-0.2 Not specified
Mn (%) 0.5-0.8 0.3-0.6
Si (%) 0.17-0.37 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 GOST 4543 40HFA GOST 4543 12HN3A
Tensile Strength 950-1150 MPa 850-1050 MPa
Yield Strength 785 MPa min 685 MPa min
Elongation 11% min 11% min
Hardness 269-331 HB 58-62 HRC (case)
Typical Applications
GOST 4543 40HFA
Used for springs, shafts, gears, fasteners, and aircraft structural components.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can GOST 4543 40HFA Be Substituted With GOST 4543 12HN3A?
GOST 4543 40HFA 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
GOST 4543 40HFA
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6500–6600 mm (255.91–259.84 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
GOST 4543 40HFA
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 4543 40HFA and GOST 4543 12HN3A?
GOST 4543 40HFA specifies V which is not specified for GOST 4543 12HN3A. GOST 4543 12HN3A specifies Ni which is not specified for GOST 4543 40HFA.
Can GOST 4543 40HFA be substituted with GOST 4543 12HN3A?
GOST 4543 40HFA 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.