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Money Saving Tips:
Forged Hollow Solutions
 Hollows
PROBLEM: SOLUTION:

Centrifugal castings are not always economical and can extend deliveries.
Custom hollow forgings offer consistent quality, often at lower cost and with quicker deliveries.
  • Heavy wall centrifugal castings often fail to meet critical I.D. surface requirements thus requiring welding and re-machining.
  • Limitations in the I.D. shape on centrifugal parts increase machining costs and extend deliveries.
  • The need to manufacture dies for specially shaped centrifugals often results in extended deliveries.
  • Excessive costs for small quantity runs are incurred due to expensive molds and set-up times.
  • More expensive nondestructive testing may be required due to the fact that centrifugal castings cannot be ultrasonic tested in most alloys.
  • Centrifugal casting produces an enlarged columnar grain structure with lower mechanical properties.
  • Hollow forgings are uniformly forged with guaranteed soundness regardless of section size.
  • The hollow forging process offers a greater variety of O.D. as well as I.D. configurations thus reducing machining time and cost.
  • No tooling is required for hollow forgings, therefore eliminating the extensive lead time and high costs associated with die manufacture.
  • Set-up time is non-existent for hollow forgings, keeping costs and lead time to a minimum, whether the quantity is one or a hundred.
  • The forging process produces a continuous grain flow which yields the optimum combination of fatigue strength and toughness.
Note extra stock on the O.D. and I.D. required for centrifugal casting process vs. forging process
Simple hollow size capabilities
Grain Flow Shown Columnar Grain Flow Simple Hollow Size
Continuous grain flow shown on a stepped O.D. and I.D. in the as-forged condition.
Forging Process
Rejection - 0%
  The same part shown with columnar grain flow in the as-cast condition.
Centrifugal Casting Process
Rejection - 10%
 Max. O.D. = 70"
Min. Wall = 2" Thk
Max. Length = 360"
Max. Wt. = 70,000#
Hollow
Forged Size
26" O.D. X 5" Long, Step
21" O.D. X 20" Long, Step
17" O.D. X 20" Long
11" I.D. Through
Weight = 2,788 lbs. 		Hollow
Forged Size
32-7/8" O.D. X 5-7/8" Long, Step
18-1/2" O.D. X 21-1/4" Long, Step
32-7/8" O.D. X 5-1/8" Long
15-3/4" I.D. Through
Weight = 2,483 lbs.

 Hollow
Forged Size
15" O.D. X 7" Long, Step
25" O.D. X 15" Long, Step
15" O.D. X 7" Long
9" I.D. Through
Weight = 2,263 lbs.
Centrifugal Cast Size
26" O.D. X 45" Long
11" I.D. Through
Weight = 5,557 lbs.
 Centrifugal Cast Size
32-7/8" O.D. X 32-1/4" Long
15-3/4" I.D. Through
Weight = 5,975 lbs.

 Centrifugal Cast Size
25" O.D. X 29" Long
9" I.D. Through
Weight = 3,509 lbs.
50% MATERIAL SAVINGS
  
58% MATERIAL SAVINGS
  
36% MATERIAL SAVINGS
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