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
|
