Alloy Chilled Cast Iron Roll
It is a roll with chilled surface. It has various alloys and is cast iron based.
Alloy Chilled Cast Iron Roll
It is a roll with a chilled surface. It has various alloys and is cast iron based. There is no free graphite in the working layer of the cast iron roll. It is featured as high hardness, good wear-resistance and the micro metallographic microstructure is fine pearlite and carbides. It's mainly used for the finishing mill for section steel, wire rod, strip, thin plate, and bar, the pre-finishing stands of high-speed wire and the roll ring of stretch reducing mill for seamless steel tube. TINVO is a professional manufacturer for high quality chilled cast roll with ISO, GB, ASTM, DIN, JIS standards and OEM and ODM are available.
The outer layer has a chilled surface structure, and the mechanical properties are also improved due to changes in the dendrite structure. The hardness of the roll and the type of matrix structure depend on the use conditions. The centrifugal casting process basically prevents graphite from appearing in the entire working layer of the roll, and the core is made of ductile iron. While improving the wear resistance of the roll, the fracture resistance is also improved.
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 |
