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SAE J404 5140 vs BS 970 EN18D

Strong Match — 86.1% match based on chemical composition and mechanical property overlap.

SAE J404 5140 (SAE J404:2000) and BS 970 EN18D (BS 970:1955) are both steel grades. Both fall under the Alloy Steel category. SAE J404 5140 is defined under SAE International, originating from United States, while BS 970 EN18D is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J404 5140 vs BS 970 EN18D is a 86.1% 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 86.1%.

Frequently Compared With SAE J404 5140:
NF A35-565 100C6 IS 11169 (Part 1) 10Ni5Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
86.1%
MECHANICAL MATCH
No shared data
OVERALL
86.1%
Specifications
Property SAE J404 5140 BS 970 EN18D
Standard SAE J404:2000 BS 970:1955
Category Alloy Steel Alloy Steel
C (%) 0.38-0.43 0.38-0.43
Cr (%) 0.70-0.90 0.85-1.15
Mn (%) 0.70-0.90 0.65-0.80
P (%) <=0.030 <=0.050
S (%) <=0.040 <=0.050
Si (%) 0.15-0.35 0.10-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property SAE J404 5140 BS 970 EN18D
Tensile Strength Not specified ≥695 MPa (45 tons/sq in, converted)
Yield Strength Not specified ≥525 MPa (34 tons/sq in, converted)
Elongation Not specified ≥22%
Hardness Not specified 201-255 HB
Condition Not specified Hardened and tempered R, ruling section 4 in (lowest-strength condition of the standard)
Typical Applications
SAE J404 5140
Chemistry-only alloy steel grade; see the composition notes for product scope
BS 970 EN18D
Not documented
Can SAE J404 5140 Be Substituted With BS 970 EN18D?
SAE J404 5140 and BS 970 EN18D overlap closely enough on chemistry and mechanical properties that BS 970 EN18D is often considered as a substitute for SAE J404 5140 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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SAE J404 5140
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BS 970 EN18D
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Frequently Asked Questions
What is the difference between SAE J404 5140 and BS 970 EN18D?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J404 5140 be substituted with BS 970 EN18D?
SAE J404 5140 and BS 970 EN18D overlap closely enough on chemistry and mechanical properties that BS 970 EN18D is often considered as a substitute for SAE J404 5140 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.