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Definite chilled cast iron roll

      Properties

The mechanical properties are improved due to the presence of chilled surface strcture and the change of pinetree-like structure. The hardness and type of matrix of roll depend on the conditions of application. The roll produced with centrifugal method basically eliminates the presence of graphite in its working layer while the core is made of nodular cast iron, increasing as a result, both the wear-resistance and breaking strength.

               

        Chemical Analysis
Designation of rolls
C
Si
Mn
P
S
Ni
Cr
Mo
NiCrMo chilled cast iron rolls (I)
2.9/3.6
0.25/0.8
0.2/1.0
0.4
0.08
0.5/1.0
0.2/0.6
0.2/0.6
NiCrMo chilled cast iron rolls (II)
2.9/3.6
0.25/0.8
0.2/1.0
0.4
0.08
1.0/2.0
0.3/1.2
0.2/0.6
NiCrMo chilled cast iron rolls (III)
2.9/3.6
0.25/0.8
0.2/1.0
0.4
0.08
2.0/3.0
0.5/1.5
0.2/0.6
NiCrMo chilled cast iron rolls(IV)
2.9/3.6
0.25/0.8
0.2/1.0
0.4
0.08
3.0/4.5
0.5/1.7
0.2/0.6
       
        Physical Properties
Designation of rolls
Barrel hardness (HSD)
Neck hardness (HSD)
Tensile strength (MPa)
Depth of chilled lager
200
200/250
250/300
300
NiCrMo chilled cast iron rolls (I)
60~70
32~50
150
12~25
15~30
17~35
20~45
NiCrMo chilled cast iron rolls (II)
62~75
35~52
150
12~25
15~30
17~35
20~45
NiCrMo chilled cast iron rolls (III)
65~80
40~55
150
12~25
15~30
17~35
20~45
NiCrMo chilled cast iron rolls(IV)
70~85
32~45
150
12~25
15~30
17~35
20~45
       
        Microstructure
Designation of rolls
Microstructure
NiCrMo chilled cast iron rolls (I)
Pearlite + cementite +ledeburite
NiCrMo chilled cast iron rolls (II)
Fine pearlite + cementite +ledeburite
NiCrMo chilled cast iron rolls (III)
Sorbite + cementite + ledeburite

 NiCrMo chilled cast iron rolls(IV)

 Sorbite + cementite + ledeburite

        Application

Designation of rolls
Application
NiCrMo chilled cast iron rolls (I)
Section mill, bar mill, wire-rod mill narrow strip mill, finishing stand
NiCrMo chilled cast iron rolls (II)
Section mill, bar mill, wire-rod mill narrow strip mill, finishing stand
NiCrMo chilled cast iron rolls (III)
Section mill, bar mill, wire-rod mill narrow strip mill, finishing stand, tube stretch reducing mill

 NiCrMo chilled cast iron rolls(IV)

 Section mill, bar mill, wire-rod mill narrow strip mill, finishing stand, tube stretch reducing mill

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