Close Alternative — 78.9% match
based on chemical composition and mechanical property overlap.
EN 10084 20MoCr4 (EN 10084:2008) and SAE J404 4120 (SAE J404:2000) are both steel grades.
Both fall under the Alloy Steel category.
EN 10084 20MoCr4 is typically used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1), while SAE J404 4120 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope.
EN 10084 20MoCr4 is defined under European Standard (EN), originating from Europe, while SAE J404 4120 is defined under SAE International, originating from United States.
As per chemical composition, EN 10084 20MoCr4 vs SAE J404 4120 is a 78.9% 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 78.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
EN 10084 20MoCr4
SAE J404 4120
Condition
Soft annealed
Not specified
Hardenability
+H band at 1.5 mm from the quenched end: 41 to 49 HRC
Not specified
Hardness
Soft annealed: 207 HB max
Not specified
Typical Applications
EN 10084 20MoCr4
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
SAE J404 4120
Chemistry-only alloy steel grade; see the composition notes for product scope
Can EN 10084 20MoCr4 Be Substituted With SAE J404 4120?
EN 10084 20MoCr4 and SAE J404 4120 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 10084 20MoCr4 and SAE J404 4120?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can EN 10084 20MoCr4 be substituted with SAE J404 4120?
EN 10084 20MoCr4 and SAE J404 4120 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.