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BS 970 EN9K vs BS 970 EN43C

Strong Match — 90.2% match based on chemical composition and mechanical property overlap.

BS 970 EN9K (BS 970:1955) and BS 970 EN43C (BS 970:1955) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN9K is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN43C is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN9K vs BS 970 EN43C is a 90.2% 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 90.2%.

Frequently Compared With BS 970 EN9K:
BS 970 (Part 1) 040A12 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 070M55 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045M10 BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
90.2%
MECHANICAL MATCH
No shared data
OVERALL
90.2%
Specifications
Property BS 970 EN9K BS 970 EN43C
Standard BS 970:1955 BS 970:1955
Category Carbon Steel Carbon Steel
C (%) 0.50-0.60 0.50-0.55
Si (%) 0.05-0.35 0.05-0.35
Mn (%) 0.50-0.80 0.70-1.00
S (%) <=0.050 <=0.060
P (%) <=0.050 <=0.060
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 EN9K BS 970 EN43C
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Yield Strength ≥355 MPa (23 tons/sq in, converted) Not specified
Elongation ≥18% Not specified
Hardness 201-255 HB Not specified
Condition Normalised, ruling section 4 in (lowest-strength condition of the standard) Not specified
Can BS 970 EN9K Be Substituted With BS 970 EN43C?
BS 970 EN9K and BS 970 EN43C overlap closely enough on chemistry and mechanical properties that BS 970 EN43C is often considered as a substitute for BS 970 EN9K in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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BS 970 EN9K
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BS 970 EN43C
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Frequently Asked Questions
What is the difference between BS 970 EN9K and BS 970 EN43C?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN9K be substituted with BS 970 EN43C?
BS 970 EN9K and BS 970 EN43C overlap closely enough on chemistry and mechanical properties that BS 970 EN43C is often considered as a substitute for BS 970 EN9K in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.