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AISI 1045 vs BS 970 (Part 1) 040A04

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

AISI 1045 and BS 970 (Part 1) 040A04 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. AISI 1045 is typically used for shafts, gears, axles, bolts, machine parts, while BS 970 (Part 1) 040A04 is commonly used for as-rolled, or as-rolled and softened, steel (section two). AISI 1045 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 1045 vs BS 970 (Part 1) 040A04 is a 85.7% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With AISI 1045:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 060A47 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 060A45 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045M10
Match Breakdown
CHEMISTRY MATCH
85.7%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property AISI 1045 BS 970 (Part 1) 040A04
Standard AISI BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.43–0.50 <=0.08
Mn (%) 0.60–0.90 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 1045 BS 970 (Part 1) 040A04
Condition Hot Rolled Not specified
Tensile Strength 570-700 MPa Not specified
Yield Strength 310-450 MPa Not specified
Elongation 16-20% Not specified
Hardness 170-210 HB Not specified
Typical Applications
AISI 1045
Shafts, gears, axles, bolts, machine parts
BS 970 (Part 1) 040A04
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can AISI 1045 Be Substituted With BS 970 (Part 1) 040A04?
AISI 1045 and BS 970 (Part 1) 040A04 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
AISI 1045
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6000–7000 mm (236.22–275.59 in)
BS 970 (Part 1) 040A04
No active listings currently.
On M-EX Right Now
AISI 1045
3 active listings and RFQs →
BS 970 (Part 1) 040A04
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 1045 and BS 970 (Part 1) 040A04?
AISI 1045 specifies S, P which are not specified for BS 970 (Part 1) 040A04.
Can AISI 1045 be substituted with BS 970 (Part 1) 040A04?
AISI 1045 and BS 970 (Part 1) 040A04 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.