Factors which determine the selection of a casting alloy and the casting process to be employed.

Alloyed metals possess:

a)      Higher tensile strength

b)      Better high temperature strength

c)      Better corrosion resistance

d)     Improved machinability and workability

e)      Lower  melting point

f)       Improved castability

Special casting techniques:

Classification:

a)      Metal mold casting

1)      Gravity or permanent mold casting

2)      Die casting – A) hot chamber process

b)                                  B) cold chamber process

3)      Slush casting

4)      Pressed or carthias casting

c)      Non-metallic mold casting

1)      Centrifugal casting:

-          True centrifugal casting

-          Semi centrifugal casting

-          Centrifuge casting

2)      Carbon dioxide molding

3)      Investment mold casting or lost-wax process

4)       Shell molding

5)      Plaster molding

6)      Mercast process

d)     Continuous casting

1)      Reciprocating molds draw casting

2)      Stationary mold

3)      Direct sheet casting

Casting can made in:

a)      Permanent molds: made up of ferrous metals and alloys (steel, gray cast iron etc.)

b)      Temporary refractory molds: made up of refractory sands and resins.