The alloy chilled cast iron roll uses the subcooling of the molten iron itself and the surface of the mold to cool. The roll is manufactured alloyed with Ni, Cr, Mo elements. There’s a uniform working layer structure with a small change in hardness to ensure the quality of the chilled cast iron roll. The matrix structure of the working layer basically has no free graphite inside with high hardness and excellent wear resistance and the hardness of the roll can be produced according to the requirements with the hardness of the outer layer ranging from HS40-95. This type of material can be used to produce large-size rolls with static composite casting tools so that the roll body has high hardness. The roll neck has high strength and toughness, showing strong thermal stability and accident resistance.
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.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.
High-Cr Composite Spin-Cast Iron Roll
The rolls are made of high-chromium white cast iron as the outer layer material of the roll body. The cast iron roll is produced by the centrifugal composite casting process. Due to the presence of lath-shaped M7c3, eutectic carbide, chrysanthemum M2c eutectic carbide and granular M23C6 secondary carbide in the matrix, the roll has excellent wear resistance, high resilience and impact resistance, thus it is widely used as the rough rolling, finishing rolling work rolls in the hot strip rolling mill, the wide and medium plate rolling mill and the finishing rolling work rolls in the small section steel and sheet rolling mill
The chemical composition of high chromium cast iron rolls is: 2.0% ～ 4.0% C, 10% ～ 30% Cr, 0.15% ～ 1.6% Ni, 0.3% ～ 2.9% Mo. Its essence is a high wear-resistant high-alloy white cast iron with a chromium content of 10% to 15%. Unlike the continuous M8C type carbides of white cast iron, the high chromium composite cast iron roll has a high hardness (HV can reach 1800)
TINVO is a professional manufacturer for high quality chilled cast roll with ISO, GB, ASTM, DIN, JIS standards and OEM and ODM are available.
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