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NF A35-552 34NCD6 vs BS 970 (Part 1) 817A37

Close Alternative — 73.8% match based on chemical composition and mechanical property overlap.

NF A35-552 34NCD6 (NF A35-552:1986) and BS 970 (Part 1) 817A37 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. NF A35-552 34NCD6 is typically used for used for aircraft parts, transmission shafts, gears, crankshafts, connecting rods, and heavy-duty fasteners., while BS 970 (Part 1) 817A37 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. NF A35-552 34NCD6 is defined under Association Francaise de Normalisation (NF), originating from France, while BS 970 (Part 1) 817A37 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, NF A35-552 34NCD6 vs BS 970 (Part 1) 817A37 is a 73.8% 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 73.8%.

Frequently Compared With NF A35-552 34NCD6:
UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
73.8%
MECHANICAL MATCH
No shared data
OVERALL
73.8%
Specifications
Property NF A35-552 34NCD6 BS 970 (Part 1) 817A37
Standard NF A35-552:1986 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.30-0.38 0.35-0.40
Si (%) 0.15-0.40 Not specified
Mn (%) 0.50-0.80 0.45-0.70
Ni (%) 1.30-1.70 1.30-1.70
Cr (%) 1.30-1.70 1.00-1.40
Mo (%) 0.15-0.30 0.20-0.35
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 A35-552 34NCD6 BS 970 (Part 1) 817A37
Tensile Strength 900-1100 MPa Not specified
Yield Strength 700-850 MPa Not specified
Elongation 10-14% Not specified
Hardness 270-340 HB Not specified
Typical Applications
NF A35-552 34NCD6
Used for aircraft parts, transmission shafts, gears, crankshafts, connecting rods, and heavy-duty fasteners.
BS 970 (Part 1) 817A37
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can NF A35-552 34NCD6 Be Substituted With BS 970 (Part 1) 817A37?
NF A35-552 34NCD6 and BS 970 (Part 1) 817A37 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 34NCD6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–7000 mm (196.85–275.59 in)
BS 970 (Part 1) 817A37
No active listings currently.
On M-EX Right Now
NF A35-552 34NCD6
2 active listings and RFQs →
BS 970 (Part 1) 817A37
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between NF A35-552 34NCD6 and BS 970 (Part 1) 817A37?
NF A35-552 34NCD6 specifies Si which is not specified for BS 970 (Part 1) 817A37.
Can NF A35-552 34NCD6 be substituted with BS 970 (Part 1) 817A37?
NF A35-552 34NCD6 and BS 970 (Part 1) 817A37 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.