Alloy steel is more commonly used for the following properties. 1. Rusty and corrosive , 2. Friction resistant and acid resistant , 3. Hardness , 4. Ghatsahata , 5. High pulling capacity , 6. Brightness and long durability , 6. Bending in heat radiation which is less prone to cracking , 6. In some cases the expenditure is less and 9. More magnetic force etc.