ASTM A897 Austempered Ductile Iron

ASTM A897 Austempered Ductile Iron

ADI Castings Conform To ASTM A897 Grade 1200/850/04 Specification Product Description and Process ADI Castings Conform To ASTM A897 Grade 1200/850/04 Specification Production process: Green sand casting process Weight range: from 0.5 kilograms to 500 kilograms Heat Treatment Process: isothermal...

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ADI Castings Conform To ASTM A897 Grade 1200/850/04 Specification

Product Description and Process

ADI Castings Conform To ASTM A897 Grade 1200/850/04 Specification

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.


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.


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 Specification

ISO 1780

SYMBOLIC DEFINITION

ISO 17804:2005

TENSILE STRENGTH
RM(N/MM2 MIN)

0,2% PROOF STRENGHT
RP0,2(N/MM2 MIN)

ELONGATION A5
(% MIN) L0=5XD

BRINELL HARDNESS
HBW

ADI 800

ISO17804/JS/800-10

800

500

10

250-310

ADI 900

ISO17804/JS/900-8

900

600

8

280-340

ADI 1050

ISO17804/JS/1050-6

1050

700

6

320-380

ADI 1200

ISO17804/JS/1200-3

1200

850

3

340-420

ADI 1400

ISO17804/JS/1400-1

1400

1100

1

380-480

ADI 1400

ISO17804/JS/HBW400

1400

1100

1

Min. 400

ADI 1600

ISO17804/JS/HBW450

1600

1300

-

Min. 450


UNI EN 156

CONVENTIONAL NAME

UNI EN 1564

TENSILE STRENGHT RM
(N/MM2 MIN)

0,2 PROOF STRESS RP0,2
(N/MM2 MIN)

ELONGATION A5
(% MIN) L0=5XD

BRINELL HARDNESS
HBW

ADI 800

EN-GJS-800-10

800

500

10

250-310

ADI 900

EN-GJS-900-8

900

600

8

280-340

ADI 1050

EN-GJS-1050-6

1050

700

6

320-380

ADI 1200

EN-GJS-1200-3

1200

850

3

340-420

ADI 1400

EN-GJS-1400-1

1400

1100

1

380-480

ADI 1400

EN-GJS-HB400

1400

1100

1

Min. 400

ADI 1600

EN-GJS-HB450

1600

1300

-

Min. 450


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