On the plate issue how would Nitrited mild steel stand-up to the wear.
George (down under)

Spot welding on a few small splayed channels is being considered. Mazda

hot rolls grooves

in the steel rotor housing liner which are then rolled over to form tiny

hooks.

We could do that if production volume warranted.

Paul Lamar

Paul, thanks for that.
But what's your opinion on the Nitrited mild steel as opposed to Chrome
Molly heat treated..
The Chrome molly is good but the mild steel would eliminate any unknowns due
to heat.
It may be that nitrited mild steel isn't as good as nirited cast iron, it's
something I'm not sure of.
George (down under)

Can one nitride mild steel? Nitride is a thin layer and it almost precludes
regrinding. If a groove is more than .003 deep a nitrided end housings
is scrap. Also it can't be redone with embedded steel in an alloy casting
because of the high temp required.

I like the idea of through hardening as regardless of the
depth of the wear the wear surface can be reground. Lycoming claims through 
hardened steel cylinders. .035 4130 steel sheet is cheap here in the US.

Paul Lamar
 
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