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.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

Spheroidal Graphite Cast Iron Roll_2

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
ļ¼ž300
CrMo indefinite chilled SG cast iron rolls
55~70
35~55
ļ¼ž300
NiCrMo indefinite chilled SG cast iron rolls (I)
48~70
35~55
ļ¼ž320
NiCrMo indefinite chilled SG cast iron rolls (II)
48~70
35~55
ļ¼ž320
PearliticĀ nodularĀ castĀ ironĀ rolls (I)
45~55
35~55
ļ¼ž450
PearliticĀ nodularĀ castĀ ironĀ rolls (II)
55~65
35~55
ļ¼ž450

Ā PearliticĀ nodularĀ castĀ ironĀ rolls (III)

Ā 62~72

Ā 35~55

Ā ļ¼ž450

Ā Ā bainitic nodularĀ castĀ ironĀ rolls (I)

Ā 55~78

Ā 32~45

Ā ļ¼ž350

Ā bainitic nodularĀ castĀ ironĀ rolls (II)

Ā 60~80

32~45Ā 

Ā ļ¼ž350

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
ļ¼ž0.04
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
ļ¼ž0.04
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
ļ¼ž0.04
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
ļ¼ž0.04
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
ļ¼ž0.04
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
ļ¼ž0.04

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 ļ¼ž0.04

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 ļ¼ž0.04

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 ļ¼ž0.04

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