When Iron is alloyed with a non-metal, a hard substance called steel is formed. Identify the non-metal which is used here.
Carbon
Alloying is a very good method of improving the properties of a metal. The substance added may be a metal or a non-metal. An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal. For example, the metal iron when mixed with a small amount of carbon (about 0.05%), it becomes hard and strong to form a new substance called Steel.