Metals

Metals

1. Metals are substances of minerals which contain one or more metallic elements,and sometimes non-metallic substances such as carbon

2. They have many uses and are a key element in transport,telecommunications,sgriculture,construction and manufacturing,among other sectors

   • Metals are hard,non-adhesive,cold and very smooth if they can be polished or theatre

3. Metals come from minerals which are parts of rocks (aluminium)

   • Surface mines
     • If the minerals are close to the surface 
   • Underground mines
     • If they are deep under the surface 

4. Ferrous

   • They include pure iron,steel and cast iron
   • They main component is iron
     • Pure iron
       • Good magnetic only melts and difficult to machine
         • Rarely used.In electronics and electrical components
     • Cast iron
       • Very hard and resistent
         • Casing for engines
     • steel
       • Very hard and resistant and easy to weld
         • structures in constructution

5. Non-ferrous

   • This group includes copper,bronze,aluminium and zinc
   • They main component is not iron or they contain very little of it

6. Some characteristics are:

   • Good electrical,thermal and acoustic conductors
   • Ductile and malleable
   • though
   • Melt at high temperatures so they can be also be using for welding
   • They expand when the temperatures rises and contract when it cools
   • Some are magnetics
   • Most of them rust when they come into contact with air and oxygen
   • Recycled and reuse
   • Some of them are toxic for the environment