What equipment is need to cut steel 5mm thick?

The equipment that is need to cut steel plate is a cutting torch or a plasma cutter.And here is how they work. what a plasma cutter does is has a electric arc that heats and melts what ever you are trying to cut and it has a air hose to the machaine the blows all the molten steel away. a angle grinder is a tool the has a disk on it the is used to shape and cut steel. And a torch has two tanks one is for oxy, short for oxygen the other is ace, short for acetylene and they have regulaters on both of the tanks witch is hooked up to a hose then to the torch body