EN 10084 17NiCrMo6-4 ANSI Equivalent 1

[Tagger]

I have a drawing that calls out a material of the component with European standard specification EN 10084 17NiCrMo6-4. What would be a good case hardening steel substitute for this. Would something like 4320 be good?
What other suggestion do you all have?
Thanks

 

[Carburize]

17CrNiMo6 is about midway between 4320 and 9310 in terms of composition. It depends what other requirements you might have from the part as well as the ability to case harden which one you pick - the core strength of 4320 is significantly lower than 17CrNiMo6 whereas 9310 is almost the same so if the part carries a torque load or some other significant stress you may want to go to the higher alloy.
If you want to just use the original 17CrNiMo6 material a number of US suppliers carry the alloy but it tends to be no less costly than 9310.

 

[Tagger]

The application is two wear plates that fit into a large hub for a universal drive shaft in a steel mill. The ID of the hub has two flats the drive the roll shaft that slides into the hub. The are case harden to a depth of 2-2.5mm to Rc 55-58. The core hardness of the 635mm x 360mm x 60mm thick plates should be 270-310 Brinell hardness. How would 4340 or 8620 work?

 

[Carburize]

The core hardness of 4320 will be around 250 - 260 BHN, 8620 will be a little lower, 17CrNiMo6 or 9310 should be over 300 BHN. Any of the grades are case hardenable to the depth and surface hardness you need.