Close Alternative — 72.6% match
based on chemical composition and mechanical property overlap.
EN 10083-3 39NiCrMo3 (EN 10083-3:2006) and SAE J404 4340 (SAE J404:2000) are both steel grades.
Both fall under the Alloy Steel category.
EN 10083-3 39NiCrMo3 is typically used for quenched and tempered, flame or induction hardened machine parts (clause 1), while SAE J404 4340 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope.
EN 10083-3 39NiCrMo3 is defined under European Standard (EN), originating from Europe, while SAE J404 4340 is defined under SAE International, originating from United States.
As per chemical composition, EN 10083-3 39NiCrMo3 vs SAE J404 4340 is a 72.6% 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 72.6%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
EN 10083-3 39NiCrMo3
SAE J404 4340
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Not specified
Elongation
11% min
Not specified
Hardness
Soft annealed (+A): 240 HBW max
Not specified
Tensile Strength
980 to 1180 MPa
Not specified
Yield Strength
785 MPa min
Not specified
Typical Applications
EN 10083-3 39NiCrMo3
Quenched and tempered, flame or induction hardened machine parts (clause 1)
SAE J404 4340
Chemistry-only alloy steel grade; see the composition notes for product scope
Can EN 10083-3 39NiCrMo3 Be Substituted With SAE J404 4340?
EN 10083-3 39NiCrMo3 and SAE J404 4340 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.
What is the difference between EN 10083-3 39NiCrMo3 and SAE J404 4340?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can EN 10083-3 39NiCrMo3 be substituted with SAE J404 4340?
EN 10083-3 39NiCrMo3 and SAE J404 4340 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.