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BS 970 EN20A vs SAE J404 4130

Close Alternative — 73.7% match based on chemical composition and mechanical property overlap.

BS 970 EN20A (BS 970:1955) and SAE J404 4130 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN20A is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for 55/65 (t), 60/70 (u), 65/75 (v) tons/sq in according to ruling section. en 20b same title., while SAE J404 4130 is commonly used for aircraft structures, pressure vessels, high tensile tubes. BS 970 EN20A is defined under British Standards (BS), originating from United Kingdom, while SAE J404 4130 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN20A vs SAE J404 4130 is a 73.7% 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 73.7%.

Frequently Compared With BS 970 EN20A:
IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
73.7%
MECHANICAL MATCH
No shared data
OVERALL
73.7%
Specifications
Property BS 970 EN20A SAE J404 4130
Standard BS 970:1955 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.20-0.30 0.28-0.33
Si (%) 0.10-0.35 0.15-0.35
Mn (%) 0.40-0.70 0.40-0.60
Cr (%) 0.50-1.00 0.80-1.10
Mo (%) 0.50-0.80 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 EN20A SAE J404 4130
Tensile Strength ≥849 MPa (55 tons/sq in, converted) Not specified
Yield Strength ≥680 MPa (44 tons/sq in, converted) Not specified
Elongation ≥18% Not specified
Hardness 248-302 HB Not specified
Condition Hardened and tempered T, ruling section 2 1/2 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN20A
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 55/65 (T), 60/70 (U), 65/75 (V) tons/sq in according to ruling section. En 20B same title.
SAE J404 4130
Aircraft structures, pressure vessels, high tensile tubes
Can BS 970 EN20A Be Substituted With SAE J404 4130?
BS 970 EN20A and SAE J404 4130 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.
Forms & Sizes Available on M-EX
BS 970 EN20A
No active listings currently.
SAE J404 4130
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5700–6400 mm (224.41–251.97 in)
On M-EX Right Now
BS 970 EN20A
0 active listings and RFQs →
SAE J404 4130
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN20A and SAE J404 4130?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN20A be substituted with SAE J404 4130?
BS 970 EN20A and SAE J404 4130 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.