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Indefinite chilled cast iron roll

      Properties

 The shell has a remarkable mechanical performance. With virtually no fall off in hardness due to the quantity of graphite remains basically unchanged throughout the working layer. The hardness of roll depends mainly on the type of matrix, namely sorbite or martensite.

               

 
        Chemical Analysis

Designation of rolls
C
Si
Mn
P
S
Ni
Cr
Mo

 V

 W

 Nb

CrMo indefinite chilled cast iron rolls
2.9/3.6
0.6/1.2
0.4/1.2
0.2
0.1
 
0.6/1.2
0.2/0.6
     
NiCrMo indefinite chilled cast iron rolls (I)
2.9/3.6
0.6/1.2
0.4/1.2
0.2
0.1
0.5/1.0
0.7/1.2
0.2/0.6
     
NiCrMo indefinite chilled cast iron rolls (II)
2.9/3.6
0.6/1.2
0.4/1.2
0.2
0.1
1.0/2.0
0.7/1.2
0.2/0.6
     
NiCrMo indefinite chilled cast iron rolls (III)
2.9/3.6
0.6/1.2
0.4/1.2
0.2
0.1
2.0/3.0
0.7/1.2
0.2/1.0
     
 NiCrMo indefinite chilled cast iron rolls (IV)

 2.9/3.6

 0.6/1.5

 0.4/1.2

 0.1

 0.05

 3.0/4.8

 1.0/2.0

 0.2/1.0

     
 NiCrMo indefinite chilled cast iron rolls (V)

 2.9/3.6

 0.6/1.5

 0.4/1.2

 0.1

 0.05

 3.0/4.8

 1.0/2.0

 0.2/2.0

 0.2/2.0

0/2.0 

 0/2.0

         
        Physical Properties
Designation of rolls
Barrel hardness (HSD)
Neck hardness (HSD)
Tensile strength (MPa)
CrMo indefinite chilled cast iron rolls
55~70
35~55
160
NiCrMo indefinite chilled cast iron rolls (I)
60~72
35~55
160
NiCrMo indefinite chilled cast iron rolls (II)
62~72
35~55
160
NiCrMo indefinite chilled cast iron rolls (III)
65~75
35~55
350
 NiCrMo indefinite chilled cast iron rolls (IV)

 70~83

 35~55

 350

 NiCrMo indefinite chilled cast iron rolls (V)

 77~85

 35~55

 350

 
        Microstructure

Designation of rolls
Microstructure
CrMo indefinite chilled cast iron rolls
Pearlite + cementite + small percentage graphite
NiCrMo indefinite chilled cast iron rolls (I)
Pearlite + cementite + small percentage graphite
NiCrMo indefinite chilled cast iron rolls (II)
Fine pearlite + cementite + small percentage graphite
NiCrMo indefinite chilled cast iron rolls (III)
Sorbite + cementite + small percentage graphite
 NiCrMo indefinite chilled cast iron rolls (IV)

 Sorbite + cementite + small percentage graphite

 NiCrMo indefinite chilled cast iron rolls (V)

 Tempered martensite + small percentage bainite + cementite + small percentage graphite

 
        Application

Designation of rolls
Application
CrMo indefinite chilled cast iron rolls
Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled cast iron rolls (I)
Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled cast iron rolls (II)
Section mill, bar mill, intermediate and finishing stands of wire-rod mill
NiCrMo indefinite chilled cast iron rolls (III)
Section mill, bar mill, intermediate and finishing stands of wire-rod mill, tube stretch reducing mill
 NiCrMo indefinite chilled cast iron rolls (IV)

 Work roll for finishing stands of hot strip mill, Intermediate plate mill, tempered mill

 NiCrMo indefinite chilled cast iron rolls (V)

 Work roll for finishing stands of hot strip mill, Intermediate plate mill, tempered mill

 

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