Spheroidal Graphite Cast Iron Roll

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Spheroidal Graphite Cast Iron Roll

Spheroidal Graphite Cast Iron Roll

Thanks to its higher content of Ni and Mo alloys, pearlite, basinite and martensite matrixes with excellent performance are produced. The graphite si spherical form, demonstraing good heat transfer property and high tensile strength. Through changing the struture into basinite of marensite matrix, chemical compostion of needly-like spherical iron of heat treatment, a dense reticular primary cementite with high wear-resistance is produced.

Spheroidal Graphite Cast Iron Roll_1Figure 1. Centrifugal                                            Figure 2. Static

Spheroidal Graphite Cast Iron Roll_2

 Figure 3. Pearlitic                          Figure 3. Bainitic

Mechanical properties

Designation of rolls
Barrel hardness (HSD)
Neck hardness (HSD)
Tensile strength (MPa)
CrMo semi-chilled SG cast iron rolls
40~55
32~50
>300
CrMo indefinite chilled SG cast iron rolls
55~70
35~55
>300
NiCrMo indefinite chilled SG cast iron rolls (I)
48~70
35~55
>320
NiCrMo indefinite chilled SG cast iron rolls (II)
48~70
35~55
>320
Pearlitic nodular cast iron rolls (I)
45~55
35~55
>450
Pearlitic nodular cast iron rolls (II)
55~65
35~55
>450

 Pearlitic nodular cast iron rolls (III)

 62~72

 35~55

 >450

 bainitic nodular cast iron rolls (I)

 55~78

 32~45

 >350

 bainitic nodular cast iron rolls (II)

 60~80

32~45 

 >350

Chemical Properties

Designation of rolls
C
Si
Mn
P
S
Ni
Cr
Mo
Mg
CrMo semi-chilled SG cast iron rolls
2.9/3.6
0.8/2.5
0.4/1.2
≤0.25
≤0.03
0.2/0.6
0.2/0.6
>0.04
CrMo indefinite chilled SG cast iron rolls
2.9/3.6
0.8/2.5
0.4/1.2
≤0.25
≤0.03
0.2/0.6
0.2/0.6
>0.04
NiCrMo indefinite chilled SG cast iron rolls (I)
2.9/3.6
0.8/2.5
0.4/1.2
≤0.25
≤0.03
0.5/1.0
0.2/0.6
0.2/0.6
>0.04
NiCrMo indefinite chilled SG cast iron rolls (II)
2.9/3.6
0.8/2.5
0.4/1.2
≤0.25
≤0.03
1.0/2.0
0.3/1.2
0.2/0.8
>0.04
Pearlitic nodular cast iron rolls (I)
2.9/3.6
1.4/2.2
0.4/1.0
≤0.15
≤0.03
1.5/2.0
0.1/0.6
0.2/0.8
>0.04
Pearlitic nodular cast iron rolls (II)
2.9/3.6
1.2/2.0
0.4/1.0
≤0.15
≤0.03
2.0/2.5
0.2/1.0
0.2/0.8
>0.04

Pearlitic nodular cast iron rolls (III)

 2.9/3.6

 1.0/2.0

 0.4/1.0

 ≤0.15

 ≤0.03

 2.5/3.0

 0.2/1.2

0.2/0.8

 >0.04

 bainitic nodular cast iron rolls (I)

 2.9/3.6

 1.2/2.2

 0.2/0.8

 ≤0.10

 ≤0.03

 3.0/3.5

0.2/1.0

 0.5/1.0

 >0.04

 bainitic nodular cast iron rolls (II)

 2.9/3.6

 1.2/2.0

 0.2/0.8

 ≤0.10

 ≤0.03

 3.5/4.5

 0.3/1.5

 0.5/1.0

 >0.04

Micro-structure

Designation of rolls
Microstructure
CrMo semi-chilled SG cast iron rolls
Pearlite + cementite + SG + small percentage fermite
CrMo indefinite chilled SG cast iron rolls
Pearlite + cementite + SG
NiCrMo indefinite chilled SG cast iron rolls (I)
Pearlite + cementite + SG
NiCrMo indefinite chilled SG cast iron rolls (II)
Fine pearlite + cementite + SG
Pearlitic nodular cast iron rolls (I)
pearlite + cementite + small percentage fermite
Pearlitic nodular cast iron rolls (II)
pearlite + cementite + small percentage fermite

 Pearlitic nodular cast iron rolls (III)

 pearlite + cementite + small percentage fermite

  bainitic nodular cast iron rolls (I)

bainite + cementite + SG

 bainitic nodular cast iron rolls (II)

bainite + cementite + SG

Application

Designation of rolls
Application
CrMo semi-chilled SG cast iron rolls
Section mill, bar mill, roughing stands of wire-rod mill, work roll of rail mill
CrMo indefinite chilled SG cast iron rolls
Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled SG cast iron rolls (I)
Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled SG cast iron rolls (II)
Section mill, bar mill, intermediate and finishing stands of wire-rod mill
Pearlitic nodular cast iron rolls (I)
roughing stands of bar mill and wire-rod mill
Pearlitic nodular cast iron rolls (II)
roughing stands of bar mill and wire-rod mill

 Pearlitic nodular cast iron rolls (III)

 roughing stands of bar mill and wire-rod mill

  bainitic nodular cast iron rolls (I)

 roughing stands of bar mill and wire-rod mill

 bainitic nodular cast iron rolls (II)

 roughing stands of bar mill and wire-rod mill