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BS 970 EN12B vs SAE J404 50B46

Close Alternative — 77.1% match based on chemical composition and mechanical property overlap.

BS 970 EN12B (BS 970:1955) and SAE J404 50B46 (SAE J404:2000) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN12B is defined under British Standards (BS), originating from United Kingdom, while SAE J404 50B46 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN12B vs SAE J404 50B46 is a 77.1% 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 77.1%.

Frequently Compared With BS 970 EN12B:
IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 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
77.1%
MECHANICAL MATCH
No shared data
OVERALL
77.1%
Specifications
Property BS 970 EN12B SAE J404 50B46
Standard BS 970:1955 SAE J404:2000
Category Alloy Steel Alloy Steel
C (%) 0.35-0.40 0.44-0.49
Si (%) 0.10-0.35 0.15-0.35
Mn (%) 0.70-0.90 0.75-1.00
Ni (%) 0.60-1.00 0.20-0.35
S (%) <=0.050 <=0.040
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 EN12B SAE J404 50B46
Tensile Strength ≥541 MPa (35 tons/sq in, converted) Not specified
Yield Strength ≥309 MPa (20 tons/sq in, converted) Not specified
Elongation ≥20% Not specified
Hardness 152-207 HB Not specified
Condition Normalised, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN12B
Not documented
SAE J404 50B46
Chemistry-only alloy steel grade; see the composition notes for product scope
Can BS 970 EN12B Be Substituted With SAE J404 50B46?
BS 970 EN12B and SAE J404 50B46 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 EN12B
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SAE J404 50B46
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Frequently Asked Questions
What is the difference between BS 970 EN12B and SAE J404 50B46?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN12B be substituted with SAE J404 50B46?
BS 970 EN12B and SAE J404 50B46 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.