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AISI 1020 vs BS 970 (Part 1) 040A04

Close Alternative — 84.9% match based on chemical composition and mechanical property overlap.

AISI 1020 and BS 970 (Part 1) 040A04 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. AISI 1020 is typically used for shafts, pins, keys, lightly stressed parts, while BS 970 (Part 1) 040A04 is commonly used for as-rolled, or as-rolled and softened, steel (section two). AISI 1020 is defined under AISI, originating from United States, while BS 970 (Part 1) 040A04 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, AISI 1020 vs BS 970 (Part 1) 040A04 is a 89.5% 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 84.9%.

Frequently Compared With AISI 1020:
BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32
Match Breakdown
CHEMISTRY MATCH
89.5%
MECHANICAL MATCH
No shared data
OVERALL
84.9%
Specifications
Property AISI 1020 BS 970 (Part 1) 040A04
Standard AISI BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.18–0.23 <=0.08
Mn (%) 0.30–0.60 0.30-0.50
S (%) ≤0.050 Not specified
P (%) ≤0.030 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 AISI 1020 BS 970 (Part 1) 040A04
Tensile Strength 420–560 MPa Not specified
Elongation ≥23% Not specified
Hardness ≤149 HB Not specified
Typical Applications
AISI 1020
Shafts, pins, keys, lightly stressed parts
BS 970 (Part 1) 040A04
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can AISI 1020 Be Substituted With BS 970 (Part 1) 040A04?
AISI 1020 and BS 970 (Part 1) 040A04 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
AISI 1020
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 4700–6800 mm (185.04–267.72 in)
BS 970 (Part 1) 040A04
No active listings currently.
On M-EX Right Now
AISI 1020
3 active listings and RFQs →
BS 970 (Part 1) 040A04
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 1020 and BS 970 (Part 1) 040A04?
AISI 1020 specifies S, P which are not specified for BS 970 (Part 1) 040A04.
Can AISI 1020 be substituted with BS 970 (Part 1) 040A04?
AISI 1020 and BS 970 (Part 1) 040A04 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.