Alloy Indefinite Chilled Cast Iron Roll

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Alloy Indefinite Chilled Cast Iron Roll

Indefinite chilled cast iron rolls also called ICCI Rolls are in the composition of alloys with cast iron. It is a roll between chilled cast iron roll and grey cast iron with a carbon content of 2.5-3.5% and a silicon content of 0.7-1.6%. The structure of the roller body changes uniformly in the outward direction and the chilled structure gradually transitions to the gray mouth structure, but the chill layer does not change significantly. 
The main application of the cast iron rolls are is work roll of bar & wire rod mill, hot strip mill, cold strip mill, PC mill, section mill, plate rolling mill, non-ferrous mill, etc. TINVO indefinite chilled cast iron rolls have standards of ISO, GB, ASTM, DIN, JIS.

The alloy indefinite chilled cast iron roll is a kind of material between cold hardened cast iron and gray cast iron. The working layer of an indefinite chilled cast iron roll body has an even distribution of graphite in the matrix structure. The graphite content increases from the surface of the roll body to the core, the hardness decreases as the depth increases, there is no obvious boundary between the working layer of the roll and the core. Infinite chilled cast iron rolls contain high chromium, nickel and molybdenum alloy elements when they contain high chromium, nickel and molybdenum alloy elements. They are produced by full flushing (overflow method) or centrifugal composite casting process. There are more carbides in the matrix structure of the working layer of the high nickel-chromium infinite chilled cast iron roll body, thus, it has higher wear resistance, and the existence of graphite in the matrix structure makes it have good thermal crack resistance.

indefinite chilled cast iron roll

Chemical Composition

Roll name

C

Si

Mn

P

S

Ni

Cr

Mo

Cr-Mo infinite chilled cast iron roll

3.20~3.70

0.80`1.20

0.60~1.00

≤0.20

≤0.10

/

0.60~1.20

0.20~0.60

Ni-Cr-Mo infinite chilled cast iron roll(I)

3.20~3.70

0.80`1.20

0.60~1.00

≤0.20

≤0.10

0.50~1.00

0.70~1.20

0.20~0.60

Ni-Cr-Mo infinite chilled cast iron roll(II)

3.20~3.70

0.60~1.00

0.60~1.00

≤0.20

≤0.10

1.01~2.00

0.70~1.20

0.20~0.60

Ni-Cr-Mo infinite chilled cast iron roll(III)

3.20~3.70

0.60~1.00

0.60~1.00

≤0.20

≤0.10

2.01~3.00

0.70~1.20

0.20~0.6

 

Physical Properties

Roll name

Roll-body hardness HSD

Roll-neck hardness HSD

Tensile strength       Mpa

Cr-Mo infinite chilled cast iron roll

55~70

35~55

>160

Ni-Cr-Mo infinite chilled cast iron roll(I)

60~72

35~55

>160

Ni-Cr-Mo infinite chilled cast iron roll(II)

62~72

35~55

>160

Ni-Cr-Mo infinite chilled cast iron roll(III)

65~75

35~55

>160

 

Metallographic Structure

Roll name

Metallurgical structure

Cr-Mo infinite chilled cast iron roll

Pearlite + cementite + a little graphite

Ni-Cr-Mo infinite chilled cast iron roll(I)

Pearlite + cementite + a little graphite

Ni-Cr-Mo infinite chilled cast iron roll(II)

Fine pearlite + cementite + a small amount of graphite

Ni-Cr-Mo infinite chilled cast iron roll(III)

Type body + cementite + a small amount of graphite

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