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Gietijzer
Nodulair gietijzer onder microscoop 100x vergroot

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. 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.

Deze materiaalsoort wordt veelvuldig toegepast in met name de grondverzet- en machine-industrie. Ook nieuwe bovenassen voor windmolens worden ervan gemaakt.

Technological and physical values

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 ferritisch ferritisch ferritisch ferlitisch perlitisch perlitisch ferlitisch perlitisch perlitisch
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
Constant Swing Strength (in bending test) uncarved trial σD MPa 180 195 195 224 248 280 304
Constant Swing Strength (in bending test) notched test σD MPa 114 122 122 134 149 168 182
Constant resistance to tensile and compressive claim δzdW MPa ±100 ±110 ±110 ±150 ±175 ±200 -
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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Casting involved mechanical properties

Wall thickness (mm) Expectaition Values in the casting, min.
from to Tensile Strength [MPa] 0.2% Yield Strength [MPa] Elongation Strength [%]
EN-GJS-350-22U-LT
EN-JS 1019
30
60
30
60
200
350
330
320
220
210
200
22
18
15
EN-GJS-400-18U-LT
EN-JS 1049
30
60
30
60
200
400
390
370
240
230
220
18
15
12
EN-GJS-400-18U
EN-JS 1062
30
60
30
60
200
400
390
370
250
250
240
18
15
12
EN-GJS-500-7U
EN-JS 1082
30
60
30
60
200
500
450
420
320
300
290
7
7
5
EN-GJS-600-3U
EN-JS 1092
30
60
30
60
200
600
600
550
370
360
340
3
2
1
EN-GJS-700 2U
EN-JS 1102
30
60
30
60
200
700
700
660
420
400
380
2
2
1
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Mechanical properties of molded specimen

Wall thickniss in the casting [mm] Thickniss molded specimen [mm] EN-GJS-350-22U-LT EN-GJS-400-18U-LT EN-GJS-400-18U EN-GJS-500-7U EN-GJS-600-3U EN-GJS-700-2U
EN-JS 1019 EN-JS 1049 EN-JS 1062 EN-JS 1082 EN-JS 1092 EN-JS 1102
Tensile Strength Rm min. [MPa] 30 - 60
60 - 200
40
70
330
320
390
370
390
370
450
420
600
550
700
660
0.2% Yield Strength Rp0,2 min. [MPa] 30 - 60
60 - 200
40
70
210
200
230
220
250
240
300
290
360
340
400
380
Elongation Strength A min. [%] 30 - 60
60 - 200
40
70
18,0
15,0
15,0
12,0
15,0
12,0
7,0
5,0
2,0
1,0
2,0
1,0
Notched test Kv min. [J] bij -20 ± 2 ºC (bij 3 proeven) 30 - 60
60-200
40
70
12,0 1)
10,0 1)
12,0
10,0
- - - -
Notched test Kv min. [J] bij +23 ± 5 ºC (bij 3 proeven) 30 - 60
60-200
40
70
17,0 2)
15,0 2)
14,0 2)
12,0 2)
- - - -
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