Chilled Cast Iron Roll
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;
With roll ring of stretch reducing mill for seamless steel tube.
Chilled Cast Iron Chemical Composition
Roll name | C | Si | Mn | P | S | Ni | Cr | Mo |
Ni-Cr-Mo chilled 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 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 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 |
Roll name | Roll-body hardness | Roll-neck hardness | Tensile strength | Chill depth | |||
Section steel | |||||||
Ni-Cr-Mo chilled iron roll(I) | 60~70 | 32~50 | ＞150 | ＜Φ200 | Φ201~250 | Φ251~300 | ＞Φ300 |
Ni-Cr-Mo chilled iron roll(II) | 62~75 | 35~52 | ＞150 | 12~25 | 15~30 | 17~35 | 20~45 |
Ni-Cr-Mo chilled 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 iron roll(I) | Pearlite + cementite + lai type body |
Ni-Cr-Mo chilled iron roll(II ) | Fine pearlite + cementite + lai type body |
Ni-Cr-Mo chilled iron roll(III ) | Type body + cementite + lai type body |
