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
|
