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Austenitic Ductile Iron ASTM A439 Grade D2 58-30-8

Posted by admin on June 14, 2017

Austenitic ductile iron creates a stronger casting than ductile iron. In addition, austenitic ductile iron castings can be made with thinner cross sections, leading some customers to replace their aluminum parts with ADI because of the associated significant weight savings.

Composition

 

C

Mn

Si

Cr

Ni

Cu

Mo

Mg

Min%

2.5

0.7

2.35

1.75

18

 

 

0.035

Max%

3.0

1.25

2.7

2.75

22

0.2

0.1

0.055

 

Physical and Mechanical Properties

UTS

58000

TS

30000

%Elongation

8%

Hardness

139-202

Density lb/in3 (g/cm3)

0.268(7.41)

Thermal Conductivity   Btu/hr·ft·F (W/m·K)

0.032

Specific Heat at 70F  Btu/lb·F (J/Kg·k)

 

Coefficient of Thermal Expansion Ɛ/F(Ɛ/C)X106 

10.4

Melting Temperature (F)

2250 F

Compressive Strength Ksi (MPa)

200


Impact Properties
Notched Charpy Impacts @ 70F = 12 ft-lb

Austenitic Ductile Iron Design Benefits 1
Austenitic ductile iron castings, also known as Ni-Resist, can be used in a wide range of applications because of the specific chemical, mechanical and physical properties.  Ni-Resist is beneficial because of the following properties:

  • D-2 is the most frequently selected grade, and excels in applications requiring corrosion, erosion and friction wear up to temperatures of 1440F(760C)austenitic-ductile-iron-machined-gear-segment.jpg
  • Good strength, ductility and oxidation resistant at high temperatures. Ductile Ni-Resist is a chromium bearing type of the ASTM A439 grades which can provide sound mechanical properties up to 1475F (800C)  
  • Ductile Ni-Resist retains toughness at low temperatures
  • Controlled thermal expansion, with the addition of Moly (Mo) D-2 has creep and stress-rupture strengths that are on par with, or exceed, cast steels
  • Controlled magnetic and electrical properties
  • Good castability and machinability

Applications: 

  • Valve stem bushings
  • Valve and pump bodies
  • Salt water and caustic services
  • Air compressor parts
  • Heat treat skirts and grates
  • Turbo charger housings

Read: For more information on austenitic ductile iron please read our webpage.

1“Ductile Iron Data” Ductile Iron Society

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