isothermal ductile iron - idi...idi: perferritic isothermal ductile iron isothermal ductile iron...
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IDIIDIIsothermal Ductile IronIsothermal Ductile Iron
IDI: Perferritic Isothermal Ductile IronIsothermal Ductile Iron (IDI) is produced by heat-treating an unalloyed ductile iron, casted with a special preconditioning of the metal bath.
IDI is a new intermediate grade between ADI and pearlitic ductile iron. Zanardi Standard 101:2007.
Perferritic Spheroidal graphite cast iron
Cast material, iron and carbon based, carbon being present mainly in the form of spheroidal graphite particles, subjected to an isothermal heat treatment in order to produce a Perferritic Matrix.
Graphite spheroidizing treatment
Process which brings the liquid iron into contact with a substance to produce graphite in spheroidal form during solidification.
IDI: Perferritic Isothermal Ductile Iron
Isothermal heat treatment of spheroidal graphite cast iron
Process, consisting of heating the casting above the Ac1 (temperature at which austenite starts to form during heating), cooling at a rate able to promote the formation of pearlite, and transforming the matrix structure for a time and a temperature (above the martensite start temperature) sufficient to produce the desired properties.
This process produces a microstructure that consists predominantly of interconnected ferrite and pearlite. This microstructure, when obtained by an isothermal heat treatment, is called Perferritite.
Isothermal Ductile Iron Process
Ductile Iron
+
Isothermal Heat treatment
=
Perferritite
IDI: MECHANICAL PROPERTIES
(104)(110)110(125)
250÷31010500800t ≤ 30
---240÷29010500700t ≤ 30GGG70BA/S15-2223
60
-
(27)
J
+23°C
Typicalimpact resistance values
55
-
(10)
J
-20°C
-265÷3005 *440735t ≤ 30GH75/45/552215
7
2
%
A5 (min)
Elongation
240÷290
225÷305
HBW
Brinell Hardness
Range
45440730t ≤ 30IDI/SZND101:2007
(8)420700t ≤ 30JS/700-2/SISO1083:2004
IDI Minimum
Values
Material designation
Relevant wall
thickness
Tensile strength
0,2% Proof strength
t Rm (min) Rp0.2 (min) -40°C
mm N/mm² N/mm² J
JS/800-10/SISO17804:2005
MinimunMinimun Zanardi Zanardi ValuesValues
IDI: MICROSTRUCTURE
IDI has shown
Good static properties
Fatigue = Pearlitic DIs
Machinability ≥ Pearlitic DIs
Impact > Pearlitic DIs
IDI: BENEFITS
HYDRAULIC ENGINE MADE OF IDIUpgrade of traditional ductile iron and substitutio n of Inox Steel. Operating pressure up to 400 bar
STANDARD MATERIALIDI
DELIVERY CONDITIONS
Weight: 65 kg
IDI POTENTIAL APPLICATIONHousing CoverHousing Cover
STANDARD MATERIALEN-GJS-400-15
DELIVERY CONDITIONSWeight: ~ 5 kg
IDI POTENTIAL APPLICATION Housing CoverHousing Cover
STANDARD MATERIALGGG 40 DIN 1693
DELIVERY CONDITIONSWeight: ~ 1 kg
IDI POTENTIAL APPLICATIONHousing CoverHousing Cover
STANDARD MATERIALEN-GJS-600-3
DELIVERY CONDITIONSWeight: ~ 1,4 kg
IDI POTENTIAL APPLICATIONHousing CoverHousing Cover
STANDARD MATERIALEN-GJS-500-7
DELIVERY CONDITIONSWeight: ~ 15 kg
Production started on 1987
Previous technology: steel welded / assembled parts
Cost savings; one rigid piece
ADVANTAGES
STANDARD MATERIALADI 800-10
DELIVERY CONDITIONSWeight: 50 – 70 kg
Painted
IDI POTENTIAL APPLICATIONSuspension Arm Suspension Arm –– OffOff--Road Road VeiclesVeicles
IDI POTENTIAL APPLICATIONSteerable Stub AxleSteerable Stub Axle
Weight & Cost reduction Reduction of machining operations
ACTUAL MATERIALForged Steel
ADVANTAGES