What conditions of use would require a chilled iron casting?

Conditions of use require chilled iron casting:

• Graphite is the major form of the iron cast which needs to be processed under slow cooling.
• Temperature should be maintained between 
• Cooling at high rate results the formation of white cast iron.
• A thick section of casting with slow cooling forms a gray iron and a thin section of casting with rapid cooling forms a hard, brittle white iron.
•  Fly wheels, gear housings, pump housings, motor frames, steam turbines are making use of chilled cast iron.