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NF A35-551 XC18 vs BS 970 (Part 1) 040A12

Close Alternative — 80.9% match based on chemical composition and mechanical property overlap.

NF A35-551 XC18 (NF A35-551:1986) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. NF A35-551 XC18 is typically used for used for shafts, pins, forged parts, welded structures, machine components, and low-stress fittings., while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). NF A35-551 XC18 is defined under Association Francaise de Normalisation (NF), originating from France, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, NF A35-551 XC18 vs BS 970 (Part 1) 040A12 is a 80.9% 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 80.9%.

Frequently Compared With NF A35-551 XC18:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 3) 070M20 BS 970 (Part 3) 080A15 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 045A10
Match Breakdown
CHEMISTRY MATCH
80.9%
MECHANICAL MATCH
No shared data
OVERALL
80.9%
Specifications
Property NF A35-551 XC18 BS 970 (Part 1) 040A12
Standard NF A35-551:1986 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.15-0.21 0.10-0.15
Si (%) 0.10-0.35 Not specified
Mn (%) 0.40-0.70 0.30-0.50
P (%) 0.045 max Not specified
S (%) 0.045 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 A35-551 XC18 BS 970 (Part 1) 040A12
Tensile Strength 370-500 MPa Not specified
Yield Strength 220-300 MPa Not specified
Elongation 26-32% Not specified
Hardness 110-150 HB Not specified
Typical Applications
NF A35-551 XC18
Used for shafts, pins, forged parts, welded structures, machine components, and low-stress fittings.
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can NF A35-551 XC18 Be Substituted With BS 970 (Part 1) 040A12?
NF A35-551 XC18 and BS 970 (Part 1) 040A12 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 A35-551 XC18
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6100–6800 mm (240.16–267.72 in)
BS 970 (Part 1) 040A12
No active listings currently.
On M-EX Right Now
NF A35-551 XC18
2 active listings and RFQs →
BS 970 (Part 1) 040A12
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between NF A35-551 XC18 and BS 970 (Part 1) 040A12?
NF A35-551 XC18 specifies Si, P, S which are not specified for BS 970 (Part 1) 040A12.
Can NF A35-551 XC18 be substituted with BS 970 (Part 1) 040A12?
NF A35-551 XC18 and BS 970 (Part 1) 040A12 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.