Payment & Shipping Terms:
|Material:||ASTM A897/897M Grade 1200/850/04||Process:||Green Sand Casting Process|
|Machining:||CNC Machining||Surface:||Anti-Rust Oil|
|Packing:||Plywood Crate + VCI Anti-Rust Bag||Heat Treatment:||Isothermal Quenching Process|
ASTM A897 Austempered Ductile Iron Isothermal Quenching Process Foundry
Product Description and Process
ADI Austempered Ductile Iron Castings Isothermal Quenching Process ASTM A897 Grade 1200/850/04
Production process: green sand molding
Machining process: CNC machining, drill, mill, etc.
Heat treatment process: isothermal quenching process
Surface treatment process: paint coating
Product Material and Uses
Normally produce with
The austempered ductile iron casting products are widely used for auto-car components, trailer suspension system, truck parts, crankshafts, railcar wheels, cylinder lock cases, tow hooks, cylinder liner, agricultural machinery components, etc.
What is Austempered Ductile Iron (ADI)?
Austempered ductile iron castings, or more commonly ADI castings, is a ductile iron casting which is processed by a special heat treatment. The austempering process, with ductile iron’s superior castability, results in a material which can be used to cast complex shapes, with a greater consistency of quality, and often at less cost. The heat treatment requires an interrupted quench, usually into a salt bath, to cool the cast part at a planned rate and long enough to achieve the desired austempered result. The resulting material has a combination of exceptional strength and toughness, meeting and often exceeding those of alloy steels.
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.
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 typical ADI Applications?
Abrasive Protection Liners
Engine Mounting Brackets
Ground Engaging Tools
Hydraulic Pump Bodies
Rack and Pinion Gearing
Railroad Car Wheels
Rollers and Sprockets
Wear Plates and Guides
Is Machining of Austempered Ductile Iron Difficult?
Machining of A.D.I. is generally speaking, possible, using normal machining techniques. Only the tapping of small diameter holes (especially dead end) and scraping of the softest type is very difficult due to work hardening. It is however common practice to machine to near final size and then heat treat. This is possible because the heat treatment is considered “soft”, and the consequent volume changes are small, and predictable with volume expansion of between only 0.2% – 0.4%.
British Standards Specification for ADI EN 1564:1997
|Mechanical Properties measured on test pieces from separately cast samples|
|Material Symbol||Number||Tensile Strength
|0.2% Proof Stress
|Refer to relevant Standard for full details|
Standard ADI Grades (USA) ASTM 897-90 (ASTM 897M-90)
|Grade||Tensile Strength (min)||Yield Strength (min)||Elongation%||Impact Energy *||Typical Hardness
|* Un-notched charpy bars tested @ 22'C (+/-4'C)
Refer to relevant Standard for full details
|Grade||Tensile* Strength (KSI)||Yield* Strength (KSI)||
|Typical Impact Energy (FT-LBS)||Typical Brinell Hardness|