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Common Types of Cast Iron Rolls

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Common Types of Cast Iron Rolls

  • Time of issue:2022-04-15 11:27

Common Types of Cast Iron Rolls

  • Time of issue:2022-04-15 11:27
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  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. Let's take a look at the common types of cast iron rolls!

  Alloy infinitely chilled cast iron rolls (alloy "rolls") Alloy infinitely chilled cast iron rolls Between chilled cast iron and gray cast iron, infinitely cast iron rolls have a uniform distribution of graphite in the matrix structure of the working layer, as the graphite cont ent extends from the main surface to the interior increase, the hardness decreases.Combined chilled cast iron roll with high chromium, nickel and molybdenum alloy elements, high nickel chromium infinite chilled cast iron roll for full cleaning (overflow method) or centrifugal composite casting process high nickel chromium infinite chilled cast iron ro ll in the main layer matrix In the structure, so it has high wear resistance, graphite is in the matrix structure, so it has good heat crack resistance, widely used in wide and strip rolls

  The alloy ductile iron roll has the characteristics of uniform distribution of graphite from the roll body to the roll core, high tensile strength, strong bearing capacity, and good wear resistance. The matrix structure is carbide, pearlite or acular bainite. According to the different matrix structure of the roll body, alloy nodular iron rolls can be divided into pearlite nodular iron rolls and bainite nodular iron rolls. Ductile iron rolls have good thermal shock resistance and wear resistance, and are widely used in rolls of large bl oom mills, section steel mills, bar mills and large seamless steel tube mills.

  Pearlitic cast iron rolls were prepared by adding chromium, nickel and molybdenum alloying elements to ductile cast iron rolls. The ductile cast iron roll has good strength, good high temperature resistance, good accident resistance, and small difference in hardness of the working layer.

  Needle-shaped cast iron rolls are made of nickel, manganese, chromium, molybdenum and other alloying elements, so static casting and centrifugal casting can produce needle-like structures (a small amount of martensite in bainite). The acicular bainite ductile iron roll has high alloy content and high casting stress. The ideal comprehensive performance can be obtained by adopting centrifugal composite casting technology. The high-chromium composite cast iron roll is made of wear-resistant high-chromium cast iron containing 12% to 22% chromium as the roll outer material, and nodular cast iron as the roll core and roll neck material. Due to the presence of flake M7c3, chrysanthemum-like M2c eutectic carbides and granular M23C6 secondary carbides in the matrix, the high chromium composite cast iron roll has excellent wear resistance. Work rolls before roughing and finishing of hot tandem rolling mill

  A composite impact cast iron roll containing a large amount of carbides is used to replace the high roll. In this roll, the transition and metal surface carbides are sprayed into the outer layer of the centrifugal casting material. Carbide does not dissolve in the substrate, and is more easily wetted between the molten substrates before the iron wraps through these basic particle systems, forming particles with different diameters below 500um. Typical carbide particle structure size is 2~lOum, and the shape is round. The professional name data of FEW TIC comes from the country. In order to prevent severe segregation during centrifugal casting, carbides of iron, tungsten, and titanium are used to mainly manufacture solid-solution carbides with a density very close to iron. The production management method is known as the "composite nano-carbide gradual strengthening method", which has been used to improve the alloy to produce infinite chill roll improvement. 5%~10% (quality evaluation score) carbide addition can reduce the wear calculation Speed ​​of hot-strip mill finishing stand rolls by 38% compared with ordinary traditional alloy chilled rolls.

  The above are the common types of cast iron rolls. If you need to know more, please feel free to contact us! Our company has many years of experience, and we look forward to your joining at any time!

 

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