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BS 970 EN100 vs SAE J404 8637

Close Alternative — 76.3% match based on chemical composition and mechanical property overlap.

BS 970 EN100 (BS 970:1955) and SAE J404 8637 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN100 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for 45/55 (r), 50/60 (s), 55/65 (t), 60/70 (u), 65/75 (v) tons/sq in according to ruling section. capable of meeting the test requirements of en 16 and en 19 except where used for special purposes., while SAE J404 8637 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. BS 970 EN100 is defined under British Standards (BS), originating from United Kingdom, while SAE J404 8637 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN100 vs SAE J404 8637 is a 76.3% 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 76.3%.

Frequently Compared With BS 970 EN100:
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 EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
76.3%
MECHANICAL MATCH
No shared data
OVERALL
76.3%
Specifications
Property BS 970 EN100 SAE J404 8637
Standard BS 970:1955 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.38-0.43
Si (%) <=0.50 0.15-0.35
Mn (%) 1.20-1.50 0.75-1.00
Ni (%) 0.50-1.00 0.40-0.70
Cr (%) 0.30-0.60 0.40-0.60
Mo (%) 0.15-0.25 0.15-0.25
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 EN100 SAE J404 8637
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Yield Strength ≥525 MPa (34 tons/sq in, converted) Not specified
Elongation ≥22% Not specified
Hardness 201-255 HB Not specified
Condition Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN100
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 45/55 (R), 50/60 (S), 55/65 (T), 60/70 (U), 65/75 (V) tons/sq in according to ruling section. Capable of meeting the test requirements of En 16 and En 19 except where used for special purposes.
SAE J404 8637
Chemistry-only alloy steel grade; see the composition notes for product scope
Can BS 970 EN100 Be Substituted With SAE J404 8637?
BS 970 EN100 and SAE J404 8637 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 EN100
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SAE J404 8637
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Frequently Asked Questions
What is the difference between BS 970 EN100 and SAE J404 8637?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN100 be substituted with SAE J404 8637?
BS 970 EN100 and SAE J404 8637 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.