Introduction
There is no free graphite in the working layer of alloy chilled cast iron roll, it is featured as high hardness, good wear-resistance, micro metallographic micro-structure is fine pearlite and carbides.
Application
-
The finishing mill for section steel, wire rod, strip, thin plate and bar;
-
The pre-finishing stands of high speed wire;
-
The roll ring of stretch reducing mill for seamless steel tube.
Chemical Composition
|
Roll name
|
C
|
Si
|
Mn
|
P
|
S
|
Ni
|
Cr
|
Mo
|
|
Ni-Cr-Mo chilled cast iron roll(I)
|
3.20~3.70
|
0.40~0.80
|
0.20~0.50
|
≤0.40
|
≤0.10
|
0.50~1.00
|
0.20~0.60
|
0.20~0.60
|
|
Ni-Cr-Mo chilled cast iron roll(II)
|
3.20~3.70
|
0.40~0.80
|
0.20~0.50
|
≤0.40
|
≤0.10
|
1.01~2.00
|
0.30~1.20
|
0.20~0.60
|
|
Ni-Cr-Mo chilled cast iron roll(III)
|
3.20~3.70
|
0.40~0.80
|
0.20~0.50
|
≤0.40
|
≤0.10
|
2.01~3.00
|
0.50~1.50
|
0.20~0.60
|
Physical Properties
|
Roll name
|
Roll-body hardness
|
Roll-neck hardness
|
Tensile strength
|
Chill depth
|
|
Section steel
|
|
Ni-Cr-Mo chilled cast iron roll(I)
|
60~70
|
32~50
|
＞150
|
＜Φ200
|
Φ201~250
|
Φ251~300
|
＞Φ300
|
|
Ni-Cr-Mo chilled cast iron roll(II)
|
62~75
|
35~52
|
＞150
|
12~25
|
15~30
|
17~35
|
20~45
|
|
Ni-Cr-Mo chilled cast iron roll(III)
|
65~80
|
40~55
|
＞150
|
12~25
|
15~30
|
17~35
|
20~45
|
Metallographic Structure
|
Roll name
|
Metallographic structure
|
|
Ni-Cr-Mo chilled cast iron roll(I)
|
Pearlite + cementite + lai type body
|
|
Ni-Cr-Mo chilled cast iron roll(II )
|
Fine pearlite + cementite + lai type body
|
|
Ni-Cr-Mo chilled cast iron roll(III )
|
Type body + cementite + lai type body
|
