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.
Figure 1.Ā Centrifugal Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Figure 2. Static
Ā Figure 3. Pearlitic Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 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
|
ļ¼300
|
|
CrMo indefinite chilled SG cast iron rolls
|
55~70
|
35~55
|
ļ¼300
|
|
NiCrMo indefinite chilled SG cast iron rolls (I)
|
48~70
|
35~55
|
ļ¼320
|
|
NiCrMo indefinite chilled SG cast iron rolls (II)
|
48~70
|
35~55
|
ļ¼320
|
|
PearliticĀ nodularĀ castĀ ironĀ rolls (I)
|
45~55
|
35~55
|
ļ¼450
|
|
PearliticĀ nodularĀ castĀ ironĀ rolls (II)
|
55~65
|
35~55
|
ļ¼450
|
|
Ā PearliticĀ nodularĀ castĀ ironĀ rolls (III) |
Ā 62~72 |
Ā 35~55 |
Ā ļ¼450 |
|
Ā Ā bainitic nodularĀ castĀ ironĀ rolls (I) |
Ā 55~78 |
Ā 32~45 |
Ā ļ¼350 |
|
Ā bainitic nodularĀ castĀ ironĀ rolls (II) |
Ā 60~80 |
32~45Ā |
Ā ļ¼350 |
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
|
ā¤0.25
|
ā¤0.03
|
0.2/0.6
|
0.2/0.6
|
ļ¼0.04
|
|
|
CrMo indefinite chilled SG cast iron rolls
|
2.9/3.6
|
0.8/2.5
|
0.4/1.2
|
ā¤0.25
|
ā¤0.03
|
0.2/0.6
|
0.2/0.6
|
ļ¼0.04
|
|
|
NiCrMo indefinite chilled SG cast iron rolls (I)
|
2.9/3.6
|
0.8/2.5
|
0.4/1.2
|
ā¤0.25
|
ā¤0.03
|
0.5/1.0
|
0.2/0.6
|
0.2/0.6
|
ļ¼0.04
|
|
NiCrMo indefinite chilled SG cast iron rolls (II)
|
2.9/3.6
|
0.8/2.5
|
0.4/1.2
|
ā¤0.25
|
ā¤0.03
|
1.0/2.0
|
0.3/1.2
|
0.2/0.8
|
ļ¼0.04
|
|
PearliticĀ nodularĀ castĀ ironĀ rolls (I)
|
2.9/3.6
|
1.4/2.2
|
0.4/1.0
|
ā¤0.15
|
ā¤0.03
|
1.5/2.0
|
0.1/0.6
|
0.2/0.8
|
ļ¼0.04
|
|
PearliticĀ nodularĀ castĀ ironĀ rollsĀ (II)
|
2.9/3.6
|
1.2/2.0
|
0.4/1.0
|
ā¤0.15
|
ā¤0.03
|
2.0/2.5
|
0.2/1.0
|
0.2/0.8
|
ļ¼0.04
|
|
PearliticĀ nodularĀ castĀ ironĀ rolls (III) |
Ā 2.9/3.6 |
Ā 1.0/2.0 |
Ā 0.4/1.0 |
Ā ā¤0.15 |
Ā ā¤0.03 |
Ā 2.5/3.0 |
Ā 0.2/1.2 |
0.2/0.8
|
Ā ļ¼0.04 |
|
Ā bainitic nodularĀ castĀ ironĀ rolls (I) |
Ā 2.9/3.6 |
Ā 1.2/2.2 |
Ā 0.2/0.8 |
Ā ā¤0.10 |
Ā ā¤0.03 |
Ā 3.0/3.5 |
0.2/1.0
|
Ā 0.5/1.0 |
Ā ļ¼0.04 |
|
Ā bainitic nodularĀ castĀ ironĀ rolls (II) |
Ā 2.9/3.6 |
Ā 1.2/2.0 |
Ā 0.2/0.8 |
Ā ā¤0.10 |
Ā ā¤0.03 |
Ā 3.5/4.5 |
Ā 0.3/1.5 |
Ā 0.5/1.0 |
Ā ļ¼0.04 |
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
|
|
PearliticĀ nodularĀ castĀ ironĀ rolls (I)
|
pearlite + cementite + small percentage fermite
|
|
PearliticĀ nodularĀ castĀ ironĀ rollsĀ (II)
|
pearlite + cementite + small percentage fermite
|
|
Ā PearliticĀ nodularĀ castĀ ironĀ rolls (III) |
Ā pearlite + cementite + small percentage fermite |
|
Ā Ā bainitic nodularĀ castĀ ironĀ rolls (I) |
bainiteĀ + cementite + SG
|
|
Ā bainitic nodularĀ castĀ ironĀ rolls (II) |
bainiteĀ + 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
|
|
PearliticĀ nodularĀ castĀ ironĀ rolls (I)
|
roughing stands of bar mill and wire-rod mill
|
|
PearliticĀ nodularĀ castĀ ironĀ rollsĀ (II)
|
roughing stands of bar mill and wire-rod mill
|
|
Ā PearliticĀ nodularĀ castĀ ironĀ rolls (III) |
Ā roughing stands of bar mill and wire-rod mill |
|
Ā Ā bainitic nodularĀ castĀ ironĀ rolls (I) |
Ā roughing stands of bar mill and wire-rod mill |
|
Ā bainitic nodularĀ castĀ ironĀ rolls (II) |
Ā roughing stands of bar mill and wire-rod mill |