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IC Rolls are cast iron grades containing graphite and carbides in a tempered martensitic matrix. Softer grades contain more graphite and less carbide. The graphite content is responsible for the excellent spall and fire crack resistance.
These rolls are usually double poured. Double poured rolls combine wear resistance of the shell together with toughness of the ductile iron core.
Excellent surface finish combined with high wear and fire crack resistance makes these rolls an excellent choice for Hot Strip Mills. Without ICDP grades, presently flat rolling in the last finishing stands is not possible.
To improve the wear resistance of the rolls, strong carbide forming alloying elements is added to the shell material. As the result, the shell indefinite chill microstructure is enhanced with discrete extremely hard Niobium and Vanadium carbides. Existing properties of bruise crack and fire crack resistance are all maintained.
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ICH78CN-Tempered Martensite Matrix with Carbides and Graphite(x500) |
ICH78CN-Tempered Martensite Matrix with Carbides and Graphite(x100) |
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Roll Grade |
Barrels Hardness (ShC) |
C (%) |
Si (%) |
Mn (%) |
Cr (%) |
Ni (%) |
Mo (%) |
V+Nb (%) |
Composition Hardness and Mechanical Properties of Core Material |
|
IC H 68 CV(N) |
68 |
3.1-3.5 |
0.7-1.6 |
0.5-1.0 |
1.0-1.8 |
2.5-4.5 |
0.1-0.7 |
- |
See core Material Info in link1 |
|
IC H 72 CV(N) |
72 |
3.1-3.5 |
0.7-1.6 |
0.5-1.0 |
1.0-1.8 |
2.5-4.5 |
0.1-0.7 |
- |
See core Material Info in link1 |
|
IC H 74 CV(N) |
74 |
3.1-3.5 |
0.6-1.5 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.7 |
- |
See core Material Info in link1 |
|
IC H 76 CV(N) |
76 |
3.1-3.5 |
1.6-1.5 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.7 |
- |
See core Material Info in link1 |
|
IC H 78 CV(N) |
78 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.7 |
- |
See core Material Info in link1 |
|
IC H 80 CV(N) |
80 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.2-2.1 |
2.5-4.5 |
0.1-0.7 |
- |
See core Material Info in link1 |
|
ICA H 68 CV(N) |
68 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.0-1.8 |
2.5-4.5 |
0.1-0.6 |
0.2-1.5 |
See core Material Info in link1 |
|
ICA H 72 CV(N) |
72 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.0-1.8 |
3.0-5.0 |
0.1-0.6 |
0.2-1.5 |
See core Material Info in link1 |
|
ICA H 74 CV(N) |
74 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.6 |
0.2-1.5 |
See core Material Info in link1 |
|
ICA H 76 CV(N) |
76 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.6 |
0.2-1.5 |
See core Material Info in link1 |
|
ICA H 78 CV(N) |
78 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.6 |
0.2-1.5 |
See core Material Info in link1 |
|
ICA H 80 CV(N) |
80 |
3.1-3.5 |
1.6-1.3 |
0.5-1.0 |
1.2-2.1 |
3.0-5.0 |
0.1-0.6 |
0.2-1.5 |
See core Material Info in link1 |
Note: On request, other roll grades not specified in the table can be produced. Cores for compound rolls can be produced on request
with Grey, Compact or Nodular cast iron.
High chromium steel is similar to high Cr cast iron with lower carbon content of 1.0-1.8%.The lower carbon grades are true steel with no eutectic carbides and higher carbon
grades have some eutectic carbides.
Hi Chromium steel rolls are used in roughing stands of HSMs, Steckle Mills and some early finishing stands of Hot Strip Mills.
Enhanced High Chromium Steel Rolls are alloyed with Nb, V and W to improve the wear resistance.
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SCrH72C Tempered Martensite with Secondary Chromium Carbides (x400) |
SCrH72C Tempered Martensite with Secondary Chromium Carbides (x100) |
|
Roll Grade |
Barrels Hardness (ShC) |
C (%) |
Si (%) |
Mn (%) |
Cr (%) |
Ni (%) |
Mo (%) |
V+Nb (%) |
Composition Hardness and Mechanical Properties of CoreMaterial |
|
SCr H 68 C |
68 |
1.0-1.8 |
0.6-1.3 |
0.5-1.5 |
10-13 |
0.5-1.5 |
0.7-1.5 |
0.2-0.5 |
See core Material Info in link1 |
|
SCr H 72 C |
72 |
1.0-1.8 |
0.6-1.3 |
0.5-1.5 |
10-13 |
0.5-1.5 |
0.7-1.5 |
0.2-0.5 |
See core Material Info in link1 |
|
SCr H 76 C |
76 |
1.0-1.8 |
0.6-1.3 |
0.5-1.5 |
10-13 |
0.8-1.8 |
0.7-1.5 |
0.2-0.5 |
See core Material Info in link1 |
|
SCr AH 68 C |
68 |
1.0-1.8 |
0.6-1.3 |
0.5-1.5 |
10-13 |
0.8-1.8 |
0.7-1.5 |
0.5-1.5 |
See core Material Info in link1 |
|
SCr AH 72 C |
72 |
1.0-1.8 |
0.6-1.3 |
0.5-1.5 |
10-13 |
0.8-1.8 |
0.7-1.5 |
0.5-1.5 |
See core Material Info in link1 |
|
SCr AH 76 C |
76 |
1.0-1.8 |
0.6-1.3 |
0.5-1.5 |
10-13 |
0.8-1.8 |
1.0-1.7 |
0.5-1.5 |
See core Material Info in link1 |
Note: On request, other roll grades not specified in the table can be produced. Cores for compound rolls can be produced on request with Grey, Compact or Nodular cast iron.
The high Cr content of the shell material and the absence of free graphite characterize these grades. Different types of carbides with high hardness and a tempered 
martensitic microstructure guarantee an excellent wear resistance. All high chromium rolls are high temperature heat treated and tempered to obtain optimal properties.
They bring high performance figures in the first finishing stands of Hot Strip Mills, Skin Pass stands and in finishing stands of small sect ion mills.
These rolls have hardly any hardness drop in the shell. The core can be made of nodular or lamellar graphite iron. This grade due to lack of graphite in the shell is sensitive to fire cracks and require mills with well designed cooling system.
Enhanced Hi Cr rolls are alloyed additionally with W, V and Nb to increase the hardness of eutectic carbides, hence increasing the performance of the rolls significantly.
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CrH76C-Tempered Martensite with Eutectic and Secondary Carbide(x100) |
CrH76C-Tempered Martensite with Eutectic and Secondary Carbide(x500) |
|
Roll Grade |
Barrels Hardness (ShC) |
C (%) |
Si (%) |
Mn (%) |
Cr (%) |
Ni (%) |
Mo (%) |
V+Nb (%) |
Composition Hardness and Mechanical Properties of Core Material |
|
Cr H 72 C |
72 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
- |
See core Material Info in link1 |
|
Cr H 76 C |
76 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
- |
See core Material Info in link1 |
|
Cr H 78 C |
78 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
- |
See core Material Info in link1 |
|
Cr H 80 C |
80 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
- |
See core Material Info in link1 |
|
Cr H 84 C |
84 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
- |
See core Material Info in link1 |
|
CrA H 72 C |
72 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
- |
See core Material Info in link1 |
|
CrA H 76 C |
76 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
0.2-1.5 |
See core Material Info in link1 |
|
CrA H 78 C |
78 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
0.2-1.5 |
See core Material Info in link1 |
|
CrA H 80 C |
80 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
0.2-1.5 |
See core Material Info in link1 |
|
CrA H 84 C |
84 |
2.5-3.2 |
0.3-0.8 |
0.7-1.6 |
16.0-22.0 |
1.0-2.5 |
1.0-2.5 |
0.2-1.5 |
See core Material Info in link1 |
Note: On request, other roll grades not specified in the table can be produced. Cores for compound rolls can be produced on request with Grey, Compact or Nodular cast iron.
Clear chill iron rolls are cast to produce an outer shell layer free of graphite, containing substantial amounts of carbides.
Rolls of this family have excellent wear resistance but are sensitive to fire cracking. These rolls are either produced single or double poured depending on the application.
PDF
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CCNiH72C- Acicular Matrix with Carbides (x400) |
CC64C-Pearlitic Matrix with Carbides (x400) |
|
Roll Grade |
Barrels Hardness (ShC) |
C (%) |
Si (%) |
Mn (%) |
Cr (%) |
Ni (%) |
Mo (%) |
Composition hardness and Properties of core material |
|
CC 60 C |
60 |
3.0-3.6 |
0.3-0.7 |
0.1-0.5 |
0.3-1.4 |
0.2-0.8 |
0.0-.0.3 |
See core Material Info in link1 |
|
CC 64 C |
64 |
3.0-3.6 |
0.3-0.7 |
0.1-0.5 |
0.3-1.4 |
0.2-0.8 |
0.0-.0.3 |
See core Material Info in link1 |
|
CC 68 C |
68 |
3.0-3.8 |
0.3-0.7 |
0.1-0.5 |
0.3-1.4 |
0.4-1.0 |
0.0-.0.3 |
See core Material Info in link1 |
|
CC Ni H 72 C |
72 |
3.2-3.8 |
0.3-0.7 |
0.1-0.5 |
0.8-1.5 |
1.5-2.5 |
0.2-0.6 |
See core Material Info in link1 |
|
CC Ni H 76 C |
76 |
3.2-3.8 |
0.3-0.7 |
0.3-0.8 |
0.8-1.5 |
2.0-3.5 |
0.2-0.6 |
See core Material Info in link1 |
|
CC Ni H 80 C |
80 |
3.2-3.8 |
0.3-0.7 |
0.3-0.8 |
0.8-1.5 |
2.0-3.5 |
0.2-0.6 |
See core Material Info in link1 |
Note: On request, other roll grades not specified in the table can be produced. Cores for compound rolls can be produced with Grey, Compact or Nodular cast iron.