Introduction
This type of indefinite chilled cast iron roll is made of high chromium, nickel and molybdenum alloy elements. It has a double chemical. Through alloying in ordinary high nickel-chromium molten steel, the strong carbide-forming elements like niobium, tungsten, and vanadium are added at a certain ratio, and the type of carbides is changed to form high-hardness and finely mixed carbides while changing the density of precipitated particles. The outside has high tensile strength and the inside is a lower one. The hardness drop is lower, so it has high wear resistance.
Application
bar & wire rod mill, hot strip mill, cold strip mill, PC mill, section mill, plate rolling mill and nonferrous mill etc.
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
|
