Austempered Ductile Iron Castings

Austempered Ductile Iron Castings

Austempered Ductile Iron Castings Isothermal Hardening Castings Product Description and Process Austempered Ductile Iron Castings Isothermal Hardening Castings Production process: Green sand casting process Weight range: from 0.5 kilograms to 500 kilograms Heat Treatment Process: isothermal...

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Austempered Ductile Iron Castings Isothermal Hardening Castings

Product Description and Process

Austempered Ductile Iron Castings Isothermal Hardening Castings

Production process: Green sand casting process

Weight range: from 0.5 kilograms to 500 kilograms

Heat Treatment Process: isothermal quenching (isothermal hardening) (salt bath treatment)

Machining process: CNC machine, machining center, lathe, mill machine, drill machine, etc.

Surface treatment process: Paint coating, electrophoretic paint coating, electrogalvanizing coating, black oxide coating, phosphate treatment, powder coating, etc.


Product Material and Uses

Normally production with ductile iron, and then do the isothermal quenching treatment

The ADI casting products are widely used for wear resistant industry parts.


What are some Benefits of Austempered Ductile Iron Castings?

•Up to 40% less cost than hardened steel forgings.

•Lower operating noise levels.

•10% less weight than steel.

•Better wear than case hardened steel.

•Excellent resistance to crack propagation.

•Good impact strength to -120ºF.

•Work hardening.


Austempered Ductile Iron Castings Properties

ADI is a group of materials whose mechanical properties can be varied over a wide range by a suitable choice of heat treatment. A high austempering temperature, 750F (400°C), produces ADI with high ductility, a yield strength in the range of 500 MPa with good fatigue and impact strength. These grades of ADI also respond well to a surface strain transformation which greatly increases their bending fatigue strength. A lower transformation temperature, 500F (260°C), results in ADI with very high yield strength (1400 MPa (200 MPa)), high hardness, excellent wear resistance and contact fatigue strength. This high strength ADI has lower fatigue strength as-austempered but it can be greatly improved with the proper rolling or grinding process. Thus, through relatively simple control of the austempering conditions, ADI can be given a range of properties unequaled by any other material. Small amounts of alloying elements such as nickel, copper and molybdenum are used to produce the desired heat treated result.


Standard ADI Grades (USA) ASTM 897-90 (ASTM 897M-90)

Grade

Tensile Strength

(min)

Yield Strength

(min)

Elongation%Impact Energy *
Typical Hardness BHN
KsiNmm2KsiNmm2Ft-lbs
Joules

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

* Un-notched charpy bars tested @ 22'C (+/-4'C)

Refer to relevant Standard for full details


British Standards Specification for ADI EN 1564:1997

Mechanical Properties measured on test pieces from separately cast samples

Material Symbol

Number

Tensile Strength N/mm2 (min)

0.2% Proof Stress N/mm2 (min)

Elongation% (min)

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

Refer to relevant Standard for full details


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