MATCH THE BLADE TO THE METAL
With the right blade or grinding disc, you can cut almost any kind of metal. The key is to match the blade to the material.
There are two types of metal: ferrous and nonferrous. (The term “ferrous” is derived from the Latin word “ferrum,” which means iron.) Any metal that contains iron is a ferrous metal and requires a ferrous-metal-cutting blade. Steel angle iron, steel roofing, rebar and steel bolts are examples of ferrous-metal building materials. Most metal-cutting blades and discs are labeled for cutting either nonferrous or ferrous metal.
The two most common nonferrous metals DIYers need to cut are aluminum and copper. Nonferrous metals are usually softer and easier to cut than ferrous metals.