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A Design Study in Austempered Ductile Iron - Smith Foundry Drive Wheel

ADI Grade Selection

The austenitic ductile iron (ADI) casting specifications are given in ASTM A-897. 
 The alloy is available in five different grades.       The three grades of interest are shown below.

ASTM A-897 Grades 

Performance
Requirement

 Choose
Grade 1
130-90-9		 Choose
Grade 2
150-110-9		 Choose
Grade 3
175-125-4
   Ultimate Tensile Strength  >140 ksi 130 ksi min 150 ksi min 175 ksi min
   Yield Strength  >100 ksi 90 ksi min 110 ksi min 125 ksi min
   % Elongation >6% 9% min 7% min 4% min
   Impact Strength ( Charpy) >50 ft-lbs 75 ft-lbs min 60 ft-lbs min 45 ft-lbs min
   Hardness  >300 BHN  269-341 BHN  302-375 BHN 341-444 BHN
Given the mechanical property requirements for the drive wheel, 
consider the nominal properties of  the first three A-897 grades in the table above.
Choose the grade that best meets the mechanical requirements. 


Back

Choose an alloy  grade above

10
 
Copyright 2005 by the American Foundry Society. All rights reserved.
Address Comments to: jss@afsinc.org. 
Last Modified:May, 2005 by STG

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 In cooperation with
 Smith Foundry Co