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NF A35-565 18NCD4 vs BS 970 (Part 1) 815M17

Close Alternative — 71.5% match based on chemical composition and mechanical property overlap.

NF A35-565 18NCD4 and BS 970 (Part 1) 815M17 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. NF A35-565 18NCD4 is typically used for used for gears, aerospace shafts, pinions, transmission components, heavy-duty bearings, and carburized mechanical parts., while BS 970 (Part 1) 815M17 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. NF A35-565 18NCD4 is defined under Association Francaise de Normalisation (NF), originating from France, while BS 970 (Part 1) 815M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, NF A35-565 18NCD4 vs BS 970 (Part 1) 815M17 is a 71.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 71.5%.

Frequently Compared With NF A35-565 18NCD4:
UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A NF A35-565 100C6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
71.5%
MECHANICAL MATCH
No shared data
OVERALL
71.5%
Specifications
Property NF A35-565 18NCD4 BS 970 (Part 1) 815M17
Standard NF A35-565 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.15-0.21 0.14-0.20
Si (%) 0.15-0.40 Not specified
Mn (%) 0.50-0.80 0.60-0.90
Ni (%) 0.90-1.40 1.20-1.70
Cr (%) 0.90-1.40 0.80-1.20
Mo (%) 0.15-0.30 0.10-0.20
P (%) 0.035 max <=0.035
S (%) 0.035 max <=0.040
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property NF A35-565 18NCD4 BS 970 (Part 1) 815M17
Tensile Strength 850-1100 MPa Not specified
Yield Strength 650-850 MPa Not specified
Elongation 10-16% Not specified
Hardness 58-62 HRC (case) Not specified
Typical Applications
NF A35-565 18NCD4
Used for gears, aerospace shafts, pinions, transmission components, heavy-duty bearings, and carburized mechanical parts.
BS 970 (Part 1) 815M17
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can NF A35-565 18NCD4 Be Substituted With BS 970 (Part 1) 815M17?
NF A35-565 18NCD4 and BS 970 (Part 1) 815M17 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 A35-565 18NCD4
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6000–6700 mm (236.22–263.78 in)
BS 970 (Part 1) 815M17
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On M-EX Right Now
NF A35-565 18NCD4
2 active listings and RFQs →
BS 970 (Part 1) 815M17
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between NF A35-565 18NCD4 and BS 970 (Part 1) 815M17?
NF A35-565 18NCD4 specifies Si which is not specified for BS 970 (Part 1) 815M17.
Can NF A35-565 18NCD4 be substituted with BS 970 (Part 1) 815M17?
NF A35-565 18NCD4 and BS 970 (Part 1) 815M17 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.