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BS 970 EN43A vs BS 970 EN43B

Strong Match — 95.7% match based on chemical composition and mechanical property overlap.

BS 970 EN43A (BS 970:1955) and BS 970 EN43B (BS 970:1955) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN43A is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN43B is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN43A vs BS 970 EN43B is a 95.7% 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 95.7%.

Frequently Compared With BS 970 EN43A:
BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A40 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32
Match Breakdown
CHEMISTRY MATCH
95.7%
MECHANICAL MATCH
No shared data
OVERALL
95.7%
Specifications
Property BS 970 EN43A BS 970 EN43B
Standard BS 970:1955 BS 970:1955
Category Carbon Steel Carbon Steel
C (%) 0.45-0.55 0.45-0.50
Si (%) 0.05-0.35 0.05-0.35
Mn (%) 0.70-1.00 0.70-1.00
S (%) <=0.060 <=0.060
P (%) <=0.060 <=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 EN43A BS 970 EN43B
Tensile Strength ≥618 MPa (40 tons/sq in, converted) Not specified
Yield Strength ≥324 MPa (21 tons/sq in, converted) Not specified
Elongation ≥18% Not specified
Hardness 179-229 HB Not specified
Condition Normalised, ruling section 1 1/8 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN43A
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable hardened and tempered for 45/55 (R) and 50/60 (S) tons/sq in according to ruling section; purchaser to state normalised, cold drawn or hardened and tempered R or S. En 43A to 43E.
BS 970 EN43B
Not documented
Can BS 970 EN43A Be Substituted With BS 970 EN43B?
BS 970 EN43A and BS 970 EN43B overlap closely enough on chemistry and mechanical properties that BS 970 EN43B is often considered as a substitute for BS 970 EN43A 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 EN43A
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BS 970 EN43B
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Frequently Asked Questions
What is the difference between BS 970 EN43A and BS 970 EN43B?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN43A be substituted with BS 970 EN43B?
BS 970 EN43A and BS 970 EN43B overlap closely enough on chemistry and mechanical properties that BS 970 EN43B is often considered as a substitute for BS 970 EN43A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.