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NF A35-552 40NCD3 vs GOST 4543 12HN3A

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

NF A35-552 40NCD3 (NF A35-552:1986) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. NF A35-552 40NCD3 is typically used for used for gears, aircraft fittings, transmission shafts, crankshafts, heavy-duty bolts, and connecting rods., while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. NF A35-552 40NCD3 is defined under Association Francaise de Normalisation (NF) (France).

As per chemical composition, NF A35-552 40NCD3 vs GOST 4543 12HN3A is a 64.7% match. As per mechanical properties, the match is 25%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With NF A35-552 40NCD3:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
64.7%
MECHANICAL MATCH
25%
OVERALL
35%
Specifications
Property NF A35-552 40NCD3 GOST 4543 12HN3A
Standard NF A35-552:1986 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.37-0.43 0.09-0.16
Si (%) 0.15-0.40 0.17-0.37
Mn (%) 0.50-0.80 0.3-0.6
Ni (%) 1.00-1.40 2.75-3.15
Cr (%) 0.60-1.00 0.6-0.9
Mo (%) 0.15-0.30 Not specified
P (%) 0.035 max Not specified
S (%) 0.035 max Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property NF A35-552 40NCD3 GOST 4543 12HN3A
Tensile Strength 850-1050 MPa 850-1050 MPa
Yield Strength 650-850 MPa 685 MPa min
Elongation 10-15% 11% min
Hardness 250-320 HB 58-62 HRC (case)
Typical Applications
NF A35-552 40NCD3
Used for gears, aircraft fittings, transmission shafts, crankshafts, heavy-duty bolts, and connecting rods.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can NF A35-552 40NCD3 Be Substituted With GOST 4543 12HN3A?
NF A35-552 40NCD3 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
NF A35-552 40NCD3
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
NF A35-552 40NCD3
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between NF A35-552 40NCD3 and GOST 4543 12HN3A?
NF A35-552 40NCD3 specifies Mo, P, S which are not specified for GOST 4543 12HN3A.
Can NF A35-552 40NCD3 be substituted with GOST 4543 12HN3A?
NF A35-552 40NCD3 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.