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BS 970 EN9K vs SAE J403 1055

Strong Match — 90.3% match based on chemical composition and mechanical property overlap.

BS 970 EN9K (BS 970:1955) and SAE J403 1055 (SAE J403:2009) 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 SAE J403 1055 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN9K vs SAE J403 1055 is a 90.3% 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 90.3%.

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
90.3%
MECHANICAL MATCH
No shared data
OVERALL
90.3%
Specifications
Property BS 970 EN9K SAE J403 1055
Standard BS 970:1955 SAE J403:2009
Category Carbon Steel Carbon Steel
C (%) 0.50-0.60 0.50-0.60
Si (%) 0.05-0.35 Not specified
Mn (%) 0.50-0.80 0.60-0.90
S (%) <=0.050 <=0.050
P (%) <=0.050 <=0.030
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 SAE J403 1055
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
Typical Applications
BS 970 EN9K
Not documented
SAE J403 1055
Chemistry-only grade; product scope as listed in the composition notes
Key Differences
Can BS 970 EN9K Be Substituted With SAE J403 1055?
BS 970 EN9K and SAE J403 1055 overlap closely enough on chemistry and mechanical properties that SAE J403 1055 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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SAE J403 1055
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Frequently Asked Questions
What is the difference between BS 970 EN9K and SAE J403 1055?
BS 970 EN9K specifies Si which is not specified for SAE J403 1055.
Can BS 970 EN9K be substituted with SAE J403 1055?
BS 970 EN9K and SAE J403 1055 overlap closely enough on chemistry and mechanical properties that SAE J403 1055 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.