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ADI (Austempered Ductile Iron)

Structure

image

The Austenitic Matrix of Acicular Ferrite known as Ausferrite which makes up the microstructure of ADI.

Properties

Austempered Ductile Iron [ADI] provides a range of high strength irons with higher ductility and toughness. Through the work hardening characteristics of the matrix these irons have an exceptional blend of wear properties and toughness. These irons have the advantage that the base iron is readily machinable before heat treatment allowing hard wearing close tolerance and mating parts to be produced.

Tensile
Twice the tensile strength of Ductile Iron.
Work Hardens.
Wear
Wear resistance superior to Steel at any hardness level.
Ideal for high abrasion applications.
Weight
10% lighter than Steel.
Cost
Energy savings over Steel.
Easier to machine than Steel reduced macining allowances.
Near net shaped castings means even less machining.

Applications & Examples

The properties of ADI coupled with the cost and flexibility benefits of ductile iron castings means the potential for ADI applications is vast.

Agriculture - excelent resistance to soil wear.
Digger/Grab Teeth - high strength and wear resistance.
Industrial - wear components, pumps, etc.
Gears - for wear resistance and better vibration damping than Steel.
Construction - crushing, grading and wear components etc.
Food & Feed milling - grinding, mixing, pelletising etc.

British Standards Specification for ADI EN 1564 : 1997
Mechanical Properties measured on test pieces from separately cast samples.
Material SymbolNumberTensile Strength
N/mm2 (min)
0.2% Proof Stress
N/mm2 (min)
Elongation
% (min)
Refer to relevant Standard for full details
EN-GJS-800-8 EN-JS1100 800 500 8
EN-GJS-1000-5 EN-JS1110 1000 700 5
EN-GJS-1200-2 EN-JS1120 1200 850 2
EN-GJS-1400-1 EN-JS1130 1400 1100 1
Standard ADI Grades (USA) ASTM 897-90 (ASTM 897M-90)
GradeTensile Strength (min)Yeild Strength (min)Elongation
%
Impact Energy *Typical Hardness
BHN
KsiNmm2KsiNmm2Ft-lbsJoules
* Un-notched charpy bars tested @ 22'C (+/-4'C)
Refer to relevant Standard for full details
1 125 850 80 550 10 75 100 269-321
2 150 1050 100 700 7 60 80 302-363
3 175 1200 125 850 4 45 60 341-444
4 200 1400 155 1100 1 25 35 388-477
5 230 1600 185 1300 - - - 444-555