Turning castings that are almost 100% Nickel

SMT · Sep 5, 2014

Anyone have experience working with parts having extremely high Ni content?

Is chip control an issue? Ballpark sfm for turning?

Milland · Sep 5, 2014

Pure nickel is generally ductile but work-hardens easily, I'd try to find the exact alloy and HT and contact one of the major carbide producers like Sandvik for advice.

Welcome to Sandvik Coromant

SMT · Sep 5, 2014

heh, yeah, i already sent the specs to my sandvik rep.

We'll see what he comes up with.

Milland · Sep 5, 2014

Let us know. Ni200 is not that bad. Hastelloy X is a little more trouble. Do you have specs on your alloy?

Limy Sami · Sep 5, 2014

Any help? http://www.specialmetals.com/documents/machining.pdf

SMT · Sep 5, 2014

All good info, thanks.

Hastelloy we've run before and had no trouble. I have not cut nickel though.

Sandvik reported back and said machinibility of Ni200 (99% Ni) is .56 x the sfm recommended for 1212 steel. They have had good success even lower than .56x at around 200sfm.

Breakdown -

B- 2.0%
Si- 3.0%
Fe- 0.75%
Cr- 0.50%
C- 0.20%
Ni- Remainder, 93.55%

Kris P · Sep 5, 2014

I made parts years ago out of pure nickel. The turning was fine but the tapped hole ended up running really slow (to stop work hardening as posted above) and had to use Moly D. Ran it like it was 316 SS. Really ductile and gooey. These were smallish bushing type parts, maybe 1/2" dia.

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