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