Austempered Ductile Iron (ADI) offers the best combination of lower costs, design flexibility, good machinability, high strength-to-weight ratio, good toughness, good wear resistance, and fatigue strength. ADI offers this superior combination of properties because it has all the advantages of a Ductile Iron casting plus mechanical properties which are superior to all cast irons and most steel forgings and castings as a result of the special heat treat process.

FARRAR CORPORATION is one of the most progressive companies in the United States at finding economical solutions to customers' product design problems through the use of ADI. We have built a tradition of helping customers with application analysis, casting and product design, pattern work, casting and machine work, painting and assembly, and have successfully produced ADI since 1988.

 

 

PROPERTIES OF AUSTEMPERED DUCTILE IRON

  • STRENGTH - equal to or greater than steel
  • ELONGATION - maintain as cast elongation while double the strength of Q & T ductile
  • TOUGHNESS - better than ductile iron and equal to or better than cast or forged steel
  • DENSITY - ductile .26#/cu. in. vs. steel .28#/cu. in.
  • FATIGUE STRENGTH - equal to or better than forged steel, increases with machining after heat treat
  • DAMPING - 5 times greater than steel





ASTM A897-90
Austempered Ductive Iron Specifications

Grade

1
125/80/10
850/550/10

2
150/100/7
1050/700/7

3
175/125/4
1200/850/4

4
200/155/1
1400/1100/1

5
230/180/-
1600-1300/-

Tensile-Min

125 KSI
850 MPa

150 KSI
1050 MPa

175 KSI
1200 MPa

200 KSI
1400 MPa

230 KSI
1600 MPa

Yield - Min.

80 KSI
550 MPa

100 KSI
700 MPa

125 KSI
850 MPa

155 KSI
1100 MP

185 KSI
1300 MPa

Elongation

10%

7%

4%

1%

-\b

Impact\a

75 Ft.-Lb
100 Joules

60 Ft.-Lb.
80 Joules

45 Ft.-Lb
60 Joules

25 Ft.-Lb.
35 Joules

-\b
-\b

BNH\c

269-321

302-363

341-444

388-477

444-555


\a Unnotched Charpy bars tested at 72° F (22°C). The values in the table are minimum for the average of the highest three test values of four tested samples.

\b Elongation and impact requirements are not specified. Although grades 200/155/1, grade 4, grades 230/185/ -, grade 5 - are primarily used for gear and wear resistance applications, grades 200/155/1, grade 4 have applications where some sacrifice in wear resistance is acceptable in order to provide a limited amount of ductility and toughness.

\c Hardness is not mandatory and is shown for information only.



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© 1997 by Farrar Corporation
For more information call us at (620) 478-2212 or email us at farrar@farrarusa.com.