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BS 970 EN40C vs NF A35-565 100C6

Minimal Match — 34.7% match based on chemical composition and mechanical property overlap.

BS 970 EN40C (BS 970:1955) and NF A35-565 100C6 are both steel grades. Both fall under the Alloy Steel category. BS 970 EN40C is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable where higher core strength is required for nitriding than en 40b provides; purchaser recommended to consult the manufacturer., while NF A35-565 100C6 is commonly used for ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts. BS 970 EN40C is defined under British Standards (BS), originating from United Kingdom, while NF A35-565 100C6 is defined under Association Francaise de Normalisation (NF), originating from France.

As per chemical composition, BS 970 EN40C vs NF A35-565 100C6 is a 52% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 34.7%.

Frequently Compared With BS 970 EN40C:
IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 11169 (Part 1) 10Ni5Cr4
Match Breakdown
CHEMISTRY MATCH
52%
MECHANICAL MATCH
0%
OVERALL
34.7%
Specifications
Property BS 970 EN40C NF A35-565 100C6
Standard BS 970:1955 NF A35-565
Category Alloy Steel Alloy Steel
C (%) 0.30-0.50 0.95-1.05
Si (%) 0.10-0.35 0.15-0.35
Mn (%) 0.40-0.80 0.25-0.45
Ni (%) <=0.40 Not specified
Cr (%) 2.50-3.50 1.35-1.65
Mo (%) 0.70-1.20 Not specified
V (%) 0.10-0.30 Not specified
S (%) <=0.050 <=0.025
P (%) <=0.050 <=0.027
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 EN40C NF A35-565 100C6
Tensile Strength ≥1313 MPa (85 tons/sq in, converted) 850-1100 MPa
Yield Strength ≥1112 MPa (72 tons/sq in, converted) Not specified
Elongation ≥10% Not specified
Hardness 375-444 HB 60-66 HRC
Condition Hardened and tempered (single condition), ruling section 2 1/2 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN40C
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable where higher core strength is required for nitriding than En 40B provides; purchaser recommended to consult the manufacturer.
NF A35-565 100C6
ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts
Key Differences
Can BS 970 EN40C Be Substituted With NF A35-565 100C6?
BS 970 EN40C and NF A35-565 100C6 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
BS 970 EN40C
No active listings currently.
NF A35-565 100C6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6700–6700 mm (263.78–263.78 in)
On M-EX Right Now
BS 970 EN40C
0 active listings and RFQs →
NF A35-565 100C6
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN40C and NF A35-565 100C6?
BS 970 EN40C specifies Ni, Mo, V which are not specified for NF A35-565 100C6.
Can BS 970 EN40C be substituted with NF A35-565 100C6?
BS 970 EN40C and NF A35-565 100C6 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.