All the new 220V circuits are grounded. A three-wire circuit might
not be grounded (and it might if it's carried through conduit or BX),
a 4 wire circuit almost certainly is.

Gary Tait wrote:

Don't. A stove or dryer outlet is protected at 30 to 50 Amps.
It is also not grounded, in that either of of the prongs are not at
ground level, as a 120V outlet has, or a european 240V outlet.