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NF A35-552 40NCD3 vs NF A35-552 34NCD6

Close Alternative — 73.3% match based on chemical composition and mechanical property overlap.

NF A35-552 40NCD3 (NF A35-552:1986) and NF A35-552 34NCD6 (NF A35-552:1986) 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 NF A35-552 34NCD6 is commonly used for used for aircraft parts, transmission shafts, gears, crankshafts, connecting rods, and heavy-duty fasteners.. NF A35-552 40NCD3 is defined under Association Francaise de Normalisation (NF), originating from France, while NF A35-552 34NCD6 is defined under Association Francaise de Normalisation (NF), originating from France.

As per chemical composition, NF A35-552 40NCD3 vs NF A35-552 34NCD6 is a 76.2% match. As per mechanical properties, the match is 67.6%. Combined, this makes them a close alternative overall at 73.3%.

Frequently Compared With NF A35-552 40NCD3:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
76.2%
MECHANICAL MATCH
67.6%
OVERALL
73.3%
Specifications
Property NF A35-552 40NCD3 NF A35-552 34NCD6
Standard NF A35-552:1986 NF A35-552:1986
Category Alloy Steel Alloy Steel
C (%) 0.37-0.43 0.30-0.38
Si (%) 0.15-0.40 0.15-0.40
Mn (%) 0.50-0.80 0.50-0.80
Ni (%) 1.00-1.40 1.30-1.70
Cr (%) 0.60-1.00 1.30-1.70
Mo (%) 0.15-0.30 0.15-0.30
P (%) 0.035 max 0.035 max
S (%) 0.035 max 0.035 max
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 NF A35-552 34NCD6
Tensile Strength 850-1050 MPa 900-1100 MPa
Yield Strength 650-850 MPa 700-850 MPa
Elongation 10-15% 10-14%
Hardness 250-320 HB 270-340 HB
Typical Applications
NF A35-552 40NCD3
Used for gears, aircraft fittings, transmission shafts, crankshafts, heavy-duty bolts, and connecting rods.
NF A35-552 34NCD6
Used for aircraft parts, transmission shafts, gears, crankshafts, connecting rods, and heavy-duty fasteners.
Can NF A35-552 40NCD3 Be Substituted With NF A35-552 34NCD6?
NF A35-552 40NCD3 and NF A35-552 34NCD6 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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)
NF A35-552 34NCD6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–7000 mm (196.85–275.59 in)
On M-EX Right Now
NF A35-552 40NCD3
2 active listings and RFQs →
NF A35-552 34NCD6
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between NF A35-552 40NCD3 and NF A35-552 34NCD6?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can NF A35-552 40NCD3 be substituted with NF A35-552 34NCD6?
NF A35-552 40NCD3 and NF A35-552 34NCD6 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.