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AISI 1040 vs BS 970 (Part 3) 070M55

Close Alternative — 84.3% match based on chemical composition and mechanical property overlap.

AISI 1040 and BS 970 (Part 3) 070M55 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. AISI 1040 is typically used for shafts, gears, bolts, couplings, crankshafts, while BS 970 (Part 3) 070M55 is commonly used for used for springs, blades, wear plates, hand tools, shafts, and cutting components.. AISI 1040 is defined under AISI, originating from United States, while BS 970 (Part 3) 070M55 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, AISI 1040 vs BS 970 (Part 3) 070M55 is a 84.3% 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 84.3%.

Frequently Compared With AISI 1040:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A04 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
84.3%
MECHANICAL MATCH
No shared data
OVERALL
84.3%
Specifications
Property AISI 1040 BS 970 (Part 3) 070M55
Standard AISI BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) 0.37–0.44 0.50-0.60
Mn (%) 0.60–0.90 0.50-0.90
S (%) ≤0.050 <=0.05
P (%) ≤0.030 <=0.05
Si (%) Not specified 0.10-0.40
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 1040 BS 970 (Part 3) 070M55
Condition Hot Rolled Not specified
Tensile Strength 565-690 MPa Not specified
Yield Strength 375-460 MPa Not specified
Elongation 20-30% Not specified
Hardness 179-217 HB Not specified
Typical Applications
AISI 1040
Shafts, gears, bolts, couplings, crankshafts
BS 970 (Part 3) 070M55
Used for springs, blades, wear plates, hand tools, shafts, and cutting components.
Key Differences
Can AISI 1040 Be Substituted With BS 970 (Part 3) 070M55?
AISI 1040 and BS 970 (Part 3) 070M55 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 1040
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6200–7000 mm (244.09–275.59 in)
BS 970 (Part 3) 070M55
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 4800–5800 mm (188.98–228.35 in)
On M-EX Right Now
AISI 1040
3 active listings and RFQs →
BS 970 (Part 3) 070M55
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 1040 and BS 970 (Part 3) 070M55?
BS 970 (Part 3) 070M55 specifies Si which is not specified for AISI 1040.
Can AISI 1040 be substituted with BS 970 (Part 3) 070M55?
AISI 1040 and BS 970 (Part 3) 070M55 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.