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BS 970 (Part 3) 070M55 vs BS 970 EN9K

Strong Match — 96.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 070M55 (BS 970 (Part 3):1991) and BS 970 EN9K (BS 970:1955) are both steel grades. Both fall under the Carbon Steel category. BS 970 (Part 3) 070M55 is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN9K is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 3) 070M55 vs BS 970 EN9K is a 96.9% 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 96.9%.

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 1) 070M55 BS 970 (Part 3) 045A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 055M15 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045M10
Match Breakdown
CHEMISTRY MATCH
96.9%
MECHANICAL MATCH
No shared data
OVERALL
96.9%
Specifications
Property BS 970 (Part 3) 070M55 BS 970 EN9K
Standard BS 970 (Part 3):1991 BS 970:1955
Category Carbon Steel Carbon Steel
C (%) 0.50-0.60 0.50-0.60
Si (%) 0.10-0.40 0.05-0.35
Mn (%) 0.50-0.90 0.50-0.80
P (%) <=0.05 <=0.050
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 BS 970 EN9K
Tensile Strength Not specified ≥695 MPa (45 tons/sq in, converted)
Yield Strength Not specified ≥355 MPa (23 tons/sq in, converted)
Elongation Not specified ≥18%
Hardness Not specified 201-255 HB
Condition Not specified Normalised, ruling section 4 in (lowest-strength condition of the standard)
Typical Applications
BS 970 (Part 3) 070M55
Used for springs, blades, wear plates, hand tools, shafts, and cutting components.
BS 970 EN9K
Not documented
Can BS 970 (Part 3) 070M55 Be Substituted With BS 970 EN9K?
BS 970 (Part 3) 070M55 and BS 970 EN9K overlap closely enough on chemistry and mechanical properties that BS 970 EN9K 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)
BS 970 EN9K
No active listings currently.
On M-EX Right Now
BS 970 (Part 3) 070M55
2 active listings and RFQs →
BS 970 EN9K
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 3) 070M55 and BS 970 EN9K?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 070M55 be substituted with BS 970 EN9K?
BS 970 (Part 3) 070M55 and BS 970 EN9K overlap closely enough on chemistry and mechanical properties that BS 970 EN9K 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.