you may have the wrong sized tire on . ie.. to large or one size to large in height causing the tire to rub the wheel well. check with the dealer to see what size it should be.
Magnetize it. Rubbing it in one direction against a magnet will do that.
The friction caused by rubber rubbing against the road with a a ton of weight pressing down.
You might possibly have a bent drive shaft, or if you have oversized tires they could be rubbing against the wheel wells
You may not have enough steering fluid?
check your power steering fluid
check the power steering pump, fluid level etc...
What is it rubbing against? What size tire is on there? Is it the front or rear?
If the vehicle has hubcaps remove them and see if the noise stops. Check the brakes as well, something on the wheels is rubbing.
By rubbing an object against another
Frottage
if u put wider aftermarket tires on then the tires are rubbing on the fender wheel well if you are refering to in/at the actual steering wheel, then some grinding noise is normal. it's possible the electrical contacts for airbag/cruise/radio controls, whatever you have on the steering wheel are making some grinding noise.
Abrasion is the rubbing and scouring effect of material like stones or pebbles rubbing against and hitting the riverbed.