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BS 970 EN5K vs BS 970 (Part 1) 040A12

Close Alternative — 80% match based on chemical composition and mechanical property overlap.

BS 970 EN5K (BS 970:1955) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. BS 970 EN5K is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). en 5k is intended for special applications only. same tensile ranges as en 5., while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). BS 970 EN5K is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN5K vs BS 970 (Part 1) 040A12 is a 80% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 80%.

Frequently Compared With BS 970 EN5K:
BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 045A10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A45
Match Breakdown
CHEMISTRY MATCH
80%
MECHANICAL MATCH
No shared data
OVERALL
80%
Specifications
Property BS 970 EN5K BS 970 (Part 1) 040A12
Standard BS 970:1955 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.25-0.35 0.10-0.15
Si (%) 0.05-0.35 Not specified
Mn (%) 0.60-1.00 0.30-0.50
S (%) <=0.050 Not specified
P (%) <=0.050 Not specified
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 EN5K BS 970 (Part 1) 040A12
Tensile Strength ≥494 MPa (32 tons/sq in, converted) Not specified
Yield Strength ≥247 MPa (16 tons/sq in, converted) Not specified
Elongation ≥25% Not specified
Hardness 143-193 HB Not specified
Condition Normalised, ruling section 2 1/2 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN5K
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). En 5K is intended for special applications only. Same tensile ranges as En 5.
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can BS 970 EN5K Be Substituted With BS 970 (Part 1) 040A12?
BS 970 EN5K and BS 970 (Part 1) 040A12 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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BS 970 EN5K
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BS 970 (Part 1) 040A12
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Frequently Asked Questions
What is the difference between BS 970 EN5K and BS 970 (Part 1) 040A12?
BS 970 EN5K specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can BS 970 EN5K be substituted with BS 970 (Part 1) 040A12?
BS 970 EN5K and BS 970 (Part 1) 040A12 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.