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Three rollers mill is mainly used for paint, ink, plastic, paint, food and other paste materials, especially suitable for grinding high viscosity and particle size of fine products. Roll is made of chilled alloy cast iron centrifugal casting, so the crystal phase is closely, high strength, the surface has high hardness and wear resistance, and is provided with a cooling system.
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Indefinite chilled roll is a mill roll between chilled cast iron and gray cast iron with a carbon content of 2.5-3.5% and a silicon content of 0.7-1.6%. The structure of the roll body changes uniformly from the outside to the inside. The cold hard structure gradually transitions to the gray structure without significant change on the cold hard layer.
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Bainitic and bainitic / martensitic nodular iron are nodular grades alloyed with Cr, Ni, and Mo with higher Cr and Ni contents. Compared to pearlitic irons, acicular irons show higher strength, toughness and wear resistance. The rolls can be cast static or spun cast depending of the size of the working layer and the mill conditions.
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This paper describes an analysis of a defective microstructure of a mill roll. For this purpose, a piece of a broken roll was collected. That roll was made of mottled cast iron. Its microstructure consisted of modular graphite, transformed ledeburite and a matrix composed of bainite and martensite. Metallographic investigations were performed nearby the fracture in the roll.
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CAST IRON BACKUP ROLLS Static Cast Iron 62 inches maximum diameter 360 inches maximum overall length 59.5 tons maximum finished weight PLATE MILL BACKUP ROLLS Forged Steel 82.6 inches maximum diameter 360 inches maximum overall length 166 tons maximum finished weight PLATE MILL WORK ROLLS Horizontally Spun Cast ICDP and High …
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Alloy iron rolls – To improve the quality of the grey cast iron various alloying elements may be added to give the roll an increased hardness. These alloy iron rolls have only small quantities of nickel (Ni), chromium (Cr) and molybdenum (Mo) and they give slightly better wear and strength than the straight grey iron.
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A coated stick electrode designed primarily for the on-site surfacing of cast-iron sugar mill rolls to enhance the roughness and prevent excessive wear taking place on the gripping surfaces of the rolls. AI-0579 can also be used generally for surfacing parts subject to severe abrasion with medium impact.
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THAI TECH STEEL (2013), foundry, steel and cast iron rolls in Thailand. TTS2013 is a specialist manufacturer of cast iron and steel rolls of up to 15 metric tonnes per piece, which are supplied to bar and wire rod mills, light and medium section mills, seamless tube mills; and plate and hot strip mills around the world.
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Doosan can manufacture cast steel components such as hydro-turbine ... presses, continuous casters and blast furnaces to iron and steel making plants. Main Products Forged Plate Back up Roll, Back up Roll, Work Roll, Intermediate Roll, Mill Housing, Roll Chock, Cylinder Housing, Ram, Anvil, Table Roller and Slag Pot ESR. 17
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Cast steel rolls – These may vary considerably according to analysis. The straight C roll has from 0.40 % to 0.90 % C and the hardness is from 28 to 36 deg Shore. Heavy mills (blooming, slabbing and heavy roughing) use the lower grades (up to 0.60 % C) while billet roughing stands use the higher grades.
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