"George E. Cawthon" wrote in message
...
big snip-------

If silicon carbide is so bad on steel, how come most small
bench grinders come with silicon carbide wheels?

What reason do you have to believe they do? In almost all instances
(tungsten carbide sharpening grinders excepted, those come with green wheels
or diamond), they do NOT!
Do you have any idea what constitutes a silicon carbide wheel? Can you
identify one at a glance?

Harold