Close Alternative — 81.4% match
based on chemical composition and mechanical property overlap.
EN 10084 18CrNiMo7-6 (EN 10084:2008) and EN 10084 17NiCrMo6-4 (EN 10084:2008) are both steel grades.
Both fall under the Alloy Steel category.
EN 10084 18CrNiMo7-6 is typically used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1), while EN 10084 17NiCrMo6-4 is commonly used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1).
EN 10084 18CrNiMo7-6 is defined under European Standard (EN), originating from Europe, while EN 10084 17NiCrMo6-4 is defined under European Standard (EN), originating from Europe.
As per chemical composition, EN 10084 18CrNiMo7-6 vs EN 10084 17NiCrMo6-4 is a 72.1% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a close alternative overall at 81.4%.
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 18CrNiMo7-6
EN 10084 17NiCrMo6-4
Condition
Soft annealed
Soft annealed
Hardenability
+H band at 1.5 mm from the quenched end: 40 to 48 HRC
+H band at 1.5 mm from the quenched end: 40 to 48 HRC
Hardness
Soft annealed: 229 HB max
Soft annealed: 229 HB max
Typical Applications
EN 10084 18CrNiMo7-6
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
EN 10084 17NiCrMo6-4
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
Can EN 10084 18CrNiMo7-6 Be Substituted With EN 10084 17NiCrMo6-4?
EN 10084 18CrNiMo7-6 and EN 10084 17NiCrMo6-4 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 18CrNiMo7-6 and EN 10084 17NiCrMo6-4?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can EN 10084 18CrNiMo7-6 be substituted with EN 10084 17NiCrMo6-4?
EN 10084 18CrNiMo7-6 and EN 10084 17NiCrMo6-4 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.