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  Ductile Cast Iron EN-GJS  
 

Ductile iron is not a single material but is part of a group of materials which can be produced to have a wide range of properties through control of the microstructure.

Structure

The common defining characteristic of this group of materials is the shape of the graphite. In ductile irons, the graphite is in the form of nodules rather than flakes as it is in grey iron. The sharp shape of the flakes of graphite create stress concentration points within the metal matrix and the rounded shape of the nodules less so, thus inhibiting the creation of cracks and providing the enhanced ductility that gives the alloy its name.

The formation of nodules is achieved by the addition of nodulizing elements, most commonly magnesium (note magnesium boils at 1100°C and iron melts at 1500°C) and, less often now, cerium (usually in the form of Mischmetal). Tellurium has also been used. Yttrium, often a component of Misch metal, has also been studied as a possible nodulizer.

Mictrostructure of Ductile Cast Iron

Physical and Mechanical Properties

 

Item according to DIN EN 1563

Measure Unit

EN-GJS-350-22-LT

EN-GJS-400-18-LT

EN-GJS-400-18

EN-GJS-500-7

EN-GJS-600-3

EN-GJS-700-2

EN-GJS-800-2

EN-JS 1015

EN-JS 1025

EN-JS 1020

EN-JS 1050

EN-JS 1060

EN-JS 1070

EN-JS 1080

Tensile Strength

Rm min.MPA

350

400

400

500

600

700

800

0.2% Yield Strength

Rp0,2 min.MPA

220

240

250

320

370

420 2)

480 2)

Elongation Strength

A %

22,0

18,0

18,0

7,0

3,0

2,0

2,0

Brinell hardness

HB

110-150

120-160

140-190

170-220

200-250

230-280

250-330

Structures

 

mainly ferritic

mainly ferritic

mainly ferritic

ferritic + pearlite

ferritic + pearlite

mainly pearlite

all pearlite

ISO-V impact test by -40 ± 2 ºC

 

12,0

 

 

 

 

 

 

ISO-V impact test by -20 ± 2 ºC

 

 

12,0

 

 

 

 

 

ISO-V impact test by +23 ± 5 ºC

Kv min.J

17,0 3)

14,0 3)

 

 

 

 

 

Shear Stress

σaB MPa

315

360

360

450

540

630

720

Torsion

TtB MPa

315

360

360

450

540

630

720

Modules of elasticity

E GPa

170

170

170

175

175

175

175

Poisson number

v –

0,280

0,280

0,280

0,280

0,280

0,280

0,280

Compressive Strength

σdB MPa

700

700

800

870

1000

1150

Frature Toughness

Klc MPa ·√m

31

30

30

25

20

15

14

Density

g/cm3

7,1

7,1

7,1

7,1

7,2

7,2

7,2

 

 

 

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