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Advantages of cast iron rolls

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Advantages of cast iron rolls

  • Time of issue:2022-05-16 15:53

Advantages of cast iron rolls

  • Time of issue:2022-05-16 15:53
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Cast iron rolls will bear high rolling loads during work, and bending, torsion and friction often occur between cast iron rolls. After a certain period of time, surface grinding is required to remove surface pits, roll marks, cracks and other defects, and gradual ly remove the fatigue layer while repairing the roll shape. The material of the roller is a polymer composed of iron-based solid solution and alloy carbide. At present, Cr5 rollers are widely used, and the single grinding amount is 0.2-0.3mm. If The small and medium-sized centrifugal rollers cannot be meshed at one time, the grinding amount after processing will exceed 0.1mm.

Alloy chilled cast iron is developed through cast iron rolls, and the cost of molten iron itself exists in the degree of supercooling and the resulting layer of quenching on the cold surface. There can be almost no free graphite oxide in the parent structure of the working layer of the roll body. The metallographic analysis structure is fine pearlite and carbide, with high hardness and good wear resistance shelf.

Cast iron rolls are necessary to prevent the formation of pearlite during cooling after casting. The long life of roll chilled cast iron suitable for rolling mill stands is due to the fact that its microstructure exhibits, as of date, a coordinated scheme of die wear resist ance , anti-sticking, and unstable propagation of graphite-induced microcracks. It can be seen that graphite acts as a lubricant on the contact surface of the roll or rolling strip, which reduces the stress concentration at the end of the micro-crack and reduces its diffusion speed. Some notable developments have been implemented in the line/process of hot strip mill end stand rolls. Materials based on the same concept, typically chilled cast iron, can be used.This involves the addition of alloying elements to form hard secondary phase particles that contain only dispersed fine carbides. There are also variations in cast iron roll consolidation techniques to achieve finer structures. Manufacturers strive to meet the high wear resistance needs of users of this roll by using hard alloying elements to form eutectics and/or secondary carbides harder than M3C, while maintaining other characteristic parameters.

 

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