Austenitic Ductile Iron

Austenitic Ductile Iron

Austenitic Ductile Iron Castings With Good Mechanical Property Product Description and Process Austenitic Ductile Iron Castings With Good Mechanical Property Production process: Green sand casting process Weight range: from 0.5 kilograms to 500 kilograms Heat Treatment Process: isothermal...

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Austenitic Ductile Iron Castings With Good Mechanical Property

Product Description and Process

Austenitic Ductile Iron Castings With Good Mechanical Property

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 Can Austempered Ductile Iron Castings (ADI) be Used for? – Application Data

Austempered ductile iron (ADI) is often used where high strength is needed and where excellent wear resistance and fatigue strength are required. Applications like for gears ADI has been used with great success. This tough work-hardening material has proved to be an excellent replacement for hardened steels. The use of austempered ductile iron can result in less weight, reduced number of components, and quieter running. Due to the lower modulus of ADI better face to face contact can be achieved which reduces Hertzien or contact stress on the teeth surfaces. Also austempered ductile iron will work harden which adds to the contact fatigue strength. As a result, gear face widths and diameters can be reduced which will make the gear run better axially and reduces weight, and at the same time provide better protection under overload conditions. The superior tribological properties of ADI have resulted in the elimination of bronze bearing bushings, and will allow the gears to run temporarily without lubrication. Due to the type of matrix structure, the softer grades of ADI can be shot-peened to double the root fatigue strength.

Another common application of austempered ductile iron castings has been crankshafts and axles. The majority of sealed-for-life refrigeration units are made with austempered crankshafts. Axle applications benefit from the materials lack of notch sensitivity, good fatigue strength, and reasonable machinability.

The railroad industry has an immense application both in retarders and rolling stock. Austempered ductile iron is very popular for retarder brake shoes, where its superior quietness and wear resistance is well received in urban semi residential communities. ADI brake beams have also been shown to outlast steel beams, and withstand the cold weather, at more than 20% less cost.

For low speed rolling stock austempered ductile iron wheels have been very successful in Europe. It has been shown that ADI railroad wheels can take larger loads than quenched and tempered steel wheels of the same hardness. ADI will also wear better when sliding between the rail and wheel exceeds more than 10%. One caveat to ADI is that it should not be used in applications where the temperature exceeds 300ºC. (570ºF) for consistently long periods. Thus high speed train wheels are not an appropriate application, nor are wheels which are braked by peripheral blocks. will allow the gears to run temporarily without lubrication. Due to the type of matrix structure, the softer grades of ADI can be shot-peened to double the root fatigue strength.

The military is becoming a major user of austempered ductile iron for shells and projectiles. Also steel forged track shoes are being replaced with ADI It is estimated that over 50,000 tons are presently produced for these military applications, and that this will grow to over 100,000 tons within the next five years. Track shoes in ADI have also been very successful both in construction, and earth moving equipment.


ASTM A89

CONVENTIONAL NAME

ASTM A897

TENSILE   STRENGHT RM
(N/MM2 MIN)

0.2 PROOF STRESS RP0,2
(N/MM2 MIN)

ELONGATION A4
(% MIN) L0=4XD

BRINELL HARDNESS
HBW

ADI 800

750-500-11

800

500

10

250-310

ADI 900

900-650-09

900

600

8

280-340

ADI 1050

1050-750-07

1050

700

6

320-380

ADI 1200

1200-850-04

1200

850

3

340-420

ADI 1400

1400-1100-02

1400

1100

1

380-480

ADI 1600

1600-1300-01

1600

1300

-

Min. 450

image001_副本

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