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BS 970 (Part 3) 070M55 vs AISI 1055

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

BS 970 (Part 3) 070M55 (BS 970 (Part 3):1991) and AISI 1055 are both steel grades. Both fall under the Carbon Steel category. BS 970 (Part 3) 070M55 is typically used for used for springs, blades, wear plates, hand tools, shafts, and cutting components., while AISI 1055 is commonly used for springs, hand tools, high strength wire. BS 970 (Part 3) 070M55 is defined under British Standards (BS), originating from United Kingdom, while AISI 1055 is defined under AISI, originating from United States.

As per chemical composition, BS 970 (Part 3) 070M55 vs AISI 1055 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 BS 970 (Part 3) 070M55:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A12 BS 970 (Part 3) 045A10 BS 970 (Part 1) 070M55 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
92.9%
MECHANICAL MATCH
No shared data
OVERALL
92.9%
Specifications
Property BS 970 (Part 3) 070M55 AISI 1055
Standard BS 970 (Part 3):1991 AISI
Category Carbon Steel Carbon Steel
C (%) 0.50-0.60 0.50–0.60
Si (%) 0.10-0.40 Not specified
Mn (%) 0.50-0.90 0.60–0.90
P (%) <=0.05 ≤0.030
S (%) <=0.05 ≤0.050
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 (Part 3) 070M55 AISI 1055
Condition Not specified Hot Rolled
Tensile Strength Not specified 700-750 MPa
Yield Strength Not specified 380-450 MPa
Elongation Not specified 12-16%
Hardness Not specified 197-220 HB
Typical Applications
BS 970 (Part 3) 070M55
Used for springs, blades, wear plates, hand tools, shafts, and cutting components.
AISI 1055
Springs, hand tools, high strength wire
Key Differences
Can BS 970 (Part 3) 070M55 Be Substituted With AISI 1055?
BS 970 (Part 3) 070M55 and AISI 1055 overlap closely enough on chemistry and mechanical properties that AISI 1055 is often considered as a substitute for BS 970 (Part 3) 070M55 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
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)
AISI 1055
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6400–7000 mm (251.97–275.59 in)
On M-EX Right Now
BS 970 (Part 3) 070M55
2 active listings and RFQs →
AISI 1055
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 3) 070M55 and AISI 1055?
BS 970 (Part 3) 070M55 specifies Si which is not specified for AISI 1055.
Can BS 970 (Part 3) 070M55 be substituted with AISI 1055?
BS 970 (Part 3) 070M55 and AISI 1055 overlap closely enough on chemistry and mechanical properties that AISI 1055 is often considered as a substitute for BS 970 (Part 3) 070M55 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.