carbon ocours in 3 forms diamond or graphite .
so if u grind some one of these 2 then u'll have carbon powder.
steel-Any of a great number of alloys that contain the element iron as the major component and small amounts of carbon as the major alloying element. These alloys are more properly referred to as carbon steels. Small amounts, generally on the order of a few percent, of other elements such as manganese, silicon, chromium, molybdenum, and nickel may also be present in carbon steels. However, when large amounts of alloying elements are added to iron to achieve special properties, other designations are used to describe the alloys. For example, large amounts of chromium, over 12%, are added to produce the important groups of alloys known as stainless steels.