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AISI 1055 vs BS 970 (Part 3) 070M55

Strong Match — 92.9% match based on chemical composition and mechanical property overlap.

AISI 1055 and BS 970 (Part 3) 070M55 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. AISI 1055 is typically used for springs, hand tools, high strength wire, while BS 970 (Part 3) 070M55 is commonly used for used for springs, blades, wear plates, hand tools, shafts, and cutting components.. AISI 1055 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 1055 vs BS 970 (Part 3) 070M55 is a 92.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 92.9%.

Frequently Compared With AISI 1055:
BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A10 BS 970 (Part 1) 070M55 BS 970 (Part 1) 060A57 BS 970 (Part 1) 040A04 BS 970 (Part 3) 045A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10
Match Breakdown
CHEMISTRY MATCH
92.9%
MECHANICAL MATCH
No shared data
OVERALL
92.9%
Specifications
Property AISI 1055 BS 970 (Part 3) 070M55
Standard AISI BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) 0.50–0.60 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 1055 BS 970 (Part 3) 070M55
Condition Hot Rolled Not specified
Tensile Strength 700-750 MPa Not specified
Yield Strength 380-450 MPa Not specified
Elongation 12-16% Not specified
Hardness 197-220 HB Not specified
Typical Applications
AISI 1055
Springs, hand tools, high strength wire
BS 970 (Part 3) 070M55
Used for springs, blades, wear plates, hand tools, shafts, and cutting components.
Key Differences
Can AISI 1055 Be Substituted With BS 970 (Part 3) 070M55?
AISI 1055 and BS 970 (Part 3) 070M55 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 070M55 is often considered as a substitute for AISI 1055 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
AISI 1055
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6400–7000 mm (251.97–275.59 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 1055
3 active listings and RFQs →
BS 970 (Part 3) 070M55
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 1055 and BS 970 (Part 3) 070M55?
BS 970 (Part 3) 070M55 specifies Si which is not specified for AISI 1055.
Can AISI 1055 be substituted with BS 970 (Part 3) 070M55?
AISI 1055 and BS 970 (Part 3) 070M55 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 070M55 is often considered as a substitute for AISI 1055 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.